Experimental simulation of bubble nucleation and magma ascent in basaltic systems: Implications for Stromboli volcano

The ascent of H O- and H O-CO -bearing basaltic melts from the deeper to the shallower part of the Stromboli magmatic system and their vesiculation were simulated from decompression experiments. A well-studied “golden” pumice produced during an intermediate- to a large-scale paroxysm was used as starting material. Volatile-bearing glasses were synthesized at an oxygen fugacity ranging from NNO-1.4 to +0.9, 1200 °C and 200 MPa. The resulting crystal- and bubble-free glasses were then isothermally (1200 °C) decompressed to final pressures ranging between 200 and 25 MPa, at a linear ascent rate of 1.5 m/s (or 39 kPa/s) prior to be rapidly quenched. Textures of post-decompression glasses that were characterized by X-ray computed tomography result from different mechanisms of degassing that include bubble nucleation, growth, coalescence, and outgassing, as well as fragmentation. Homogeneous bubble nucleation occurs for supersaturation pressures (difference between saturation pressure and pressure at which bubbles start to form homogeneously, Δ ) ≤ 50 MPa. In the CO -free melts, homogeneous nucleation occurs as two distinct events, the first at high (200–150 MPa) and the second at low (50–25 MPa) near the fragmentation level. In contrast, in the CO -bearing melts, multiple events of homogeneous bubble nucleation occur over a substantial interval along the decompression path. Bubble coalescence occurs in both H O- and H O-CO -bearing melts and is the more strongly marked between 100 and 50 MPa P . The CO -free melts follow equilibrium degassing until 100 MPa and are slightly supersaturated at 60 and 50 MPa , thus providing the driving force for the second bubble nucleation event. In comparison, disequilibrium degassing occurs systematically in the CO -bearing melts that retain high CO concentrations. Fragmentation was observed in some CO2-free charges decompressed to 25 MPa and is intimately associated with the occurrence of the second bubble nucleation event. Textures of H O-CO -bearing glasses reproduce certain critical aspects of the Stromboli natural textures (bubble number densities, shapes, sizes, and distributions) and chemistries (residual volatile concentrations). Average bubble sizes, bubble size distribution (BSD), and bubble number density (BND) data are used together to estimate that the “golden” pumice magmas ascend from their source region in 43 to 128 min. Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Nolwenn Le Gall [verfasserIn] Michel Pichavant

Format:	Artikel
Sprache:	Englisch

Erschienen:	2016

Schlagwörter:	volatiles fragmentation bubble nucleation magma ascent Stromboli magma degassing Basalt

Übergeordnetes Werk:	Enthalten in: American mineralogist - Washington, DC [u.a.] : Soc., 1916, 101(2016), 9, Seite 1967-1985
Übergeordnetes Werk:	volume:101 ; year:2016 ; number:9 ; pages:1967-1985

Links:	Volltext Link aufrufen

DOI / URN:	10.2138/am-2016-5639

Katalog-ID:	OLC1982561084

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520			\|a The ascent of H O- and H O-CO -bearing basaltic melts from the deeper to the shallower part of the Stromboli magmatic system and their vesiculation were simulated from decompression experiments. A well-studied “golden” pumice produced during an intermediate- to a large-scale paroxysm was used as starting material. Volatile-bearing glasses were synthesized at an oxygen fugacity ranging from NNO-1.4 to +0.9, 1200 °C and 200 MPa. The resulting crystal- and bubble-free glasses were then isothermally (1200 °C) decompressed to final pressures ranging between 200 and 25 MPa, at a linear ascent rate of 1.5 m/s (or 39 kPa/s) prior to be rapidly quenched. Textures of post-decompression glasses that were characterized by X-ray computed tomography result from different mechanisms of degassing that include bubble nucleation, growth, coalescence, and outgassing, as well as fragmentation. Homogeneous bubble nucleation occurs for supersaturation pressures (difference between saturation pressure and pressure at which bubbles start to form homogeneously, Δ ) ≤ 50 MPa. In the CO -free melts, homogeneous nucleation occurs as two distinct events, the first at high (200–150 MPa) and the second at low (50–25 MPa) near the fragmentation level. In contrast, in the CO -bearing melts, multiple events of homogeneous bubble nucleation occur over a substantial interval along the decompression path. Bubble coalescence occurs in both H O- and H O-CO -bearing melts and is the more strongly marked between 100 and 50 MPa P . The CO -free melts follow equilibrium degassing until 100 MPa and are slightly supersaturated at 60 and 50 MPa , thus providing the driving force for the second bubble nucleation event. In comparison, disequilibrium degassing occurs systematically in the CO -bearing melts that retain high CO concentrations. Fragmentation was observed in some CO2-free charges decompressed to 25 MPa and is intimately associated with the occurrence of the second bubble nucleation event. Textures of H O-CO -bearing glasses reproduce certain critical aspects of the Stromboli natural textures (bubble number densities, shapes, sizes, and distributions) and chemistries (residual volatile concentrations). Average bubble sizes, bubble size distribution (BSD), and bubble number density (BND) data are used together to estimate that the “golden” pumice magmas ascend from their source region in 43 to 128 min.
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allfields	10.2138/am-2016-5639 doi PQ20161012 (DE-627)OLC1982561084 (DE-599)GBVOLC1982561084 (PRQ)c907-8f93a9ed415b6baa77c183c5490a3542df7aee48c79ccc0331044c6c4b4672580 (KEY)0120180820160000101000901967experimentalsimulationofbubblenucleationandmagmaas DE-627 ger DE-627 rakwb eng 550 540 DNB 38.30 bkl Nolwenn Le Gall verfasserin aut Experimental simulation of bubble nucleation and magma ascent in basaltic systems: Implications for Stromboli volcano 2016 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier The ascent of H O- and H O-CO -bearing basaltic melts from the deeper to the shallower part of the Stromboli magmatic system and their vesiculation were simulated from decompression experiments. A well-studied “golden” pumice produced during an intermediate- to a large-scale paroxysm was used as starting material. Volatile-bearing glasses were synthesized at an oxygen fugacity ranging from NNO-1.4 to +0.9, 1200 °C and 200 MPa. The resulting crystal- and bubble-free glasses were then isothermally (1200 °C) decompressed to final pressures ranging between 200 and 25 MPa, at a linear ascent rate of 1.5 m/s (or 39 kPa/s) prior to be rapidly quenched. Textures of post-decompression glasses that were characterized by X-ray computed tomography result from different mechanisms of degassing that include bubble nucleation, growth, coalescence, and outgassing, as well as fragmentation. Homogeneous bubble nucleation occurs for supersaturation pressures (difference between saturation pressure and pressure at which bubbles start to form homogeneously, Δ ) ≤ 50 MPa. In the CO -free melts, homogeneous nucleation occurs as two distinct events, the first at high (200–150 MPa) and the second at low (50–25 MPa) near the fragmentation level. In contrast, in the CO -bearing melts, multiple events of homogeneous bubble nucleation occur over a substantial interval along the decompression path. Bubble coalescence occurs in both H O- and H O-CO -bearing melts and is the more strongly marked between 100 and 50 MPa P . The CO -free melts follow equilibrium degassing until 100 MPa and are slightly supersaturated at 60 and 50 MPa , thus providing the driving force for the second bubble nucleation event. In comparison, disequilibrium degassing occurs systematically in the CO -bearing melts that retain high CO concentrations. Fragmentation was observed in some CO2-free charges decompressed to 25 MPa and is intimately associated with the occurrence of the second bubble nucleation event. Textures of H O-CO -bearing glasses reproduce certain critical aspects of the Stromboli natural textures (bubble number densities, shapes, sizes, and distributions) and chemistries (residual volatile concentrations). Average bubble sizes, bubble size distribution (BSD), and bubble number density (BND) data are used together to estimate that the “golden” pumice magmas ascend from their source region in 43 to 128 min. volatiles fragmentation bubble nucleation magma ascent Stromboli magma degassing Basalt Michel Pichavant oth Enthalten in American mineralogist Washington, DC [u.a.] : Soc., 1916 101(2016), 9, Seite 1967-1985 (DE-627)129081795 (DE-600)3514-2 (DE-576)014414716 0003-004X nnns volume:101 year:2016 number:9 pages:1967-1985 http://dx.doi.org/10.2138/am-2016-5639 Volltext http://www.degruyter.com/doi/10.2138/am-2016-5639 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-CHE SSG-OLC-GEO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO GBV_ILN_21 GBV_ILN_22 GBV_ILN_40 GBV_ILN_65 GBV_ILN_70 GBV_ILN_188 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_4012 GBV_ILN_4112 GBV_ILN_4323 38.30 AVZ AR 101 2016 9 1967-1985
spelling	10.2138/am-2016-5639 doi PQ20161012 (DE-627)OLC1982561084 (DE-599)GBVOLC1982561084 (PRQ)c907-8f93a9ed415b6baa77c183c5490a3542df7aee48c79ccc0331044c6c4b4672580 (KEY)0120180820160000101000901967experimentalsimulationofbubblenucleationandmagmaas DE-627 ger DE-627 rakwb eng 550 540 DNB 38.30 bkl Nolwenn Le Gall verfasserin aut Experimental simulation of bubble nucleation and magma ascent in basaltic systems: Implications for Stromboli volcano 2016 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier The ascent of H O- and H O-CO -bearing basaltic melts from the deeper to the shallower part of the Stromboli magmatic system and their vesiculation were simulated from decompression experiments. A well-studied “golden” pumice produced during an intermediate- to a large-scale paroxysm was used as starting material. Volatile-bearing glasses were synthesized at an oxygen fugacity ranging from NNO-1.4 to +0.9, 1200 °C and 200 MPa. The resulting crystal- and bubble-free glasses were then isothermally (1200 °C) decompressed to final pressures ranging between 200 and 25 MPa, at a linear ascent rate of 1.5 m/s (or 39 kPa/s) prior to be rapidly quenched. Textures of post-decompression glasses that were characterized by X-ray computed tomography result from different mechanisms of degassing that include bubble nucleation, growth, coalescence, and outgassing, as well as fragmentation. Homogeneous bubble nucleation occurs for supersaturation pressures (difference between saturation pressure and pressure at which bubbles start to form homogeneously, Δ ) ≤ 50 MPa. In the CO -free melts, homogeneous nucleation occurs as two distinct events, the first at high (200–150 MPa) and the second at low (50–25 MPa) near the fragmentation level. In contrast, in the CO -bearing melts, multiple events of homogeneous bubble nucleation occur over a substantial interval along the decompression path. Bubble coalescence occurs in both H O- and H O-CO -bearing melts and is the more strongly marked between 100 and 50 MPa P . The CO -free melts follow equilibrium degassing until 100 MPa and are slightly supersaturated at 60 and 50 MPa , thus providing the driving force for the second bubble nucleation event. In comparison, disequilibrium degassing occurs systematically in the CO -bearing melts that retain high CO concentrations. Fragmentation was observed in some CO2-free charges decompressed to 25 MPa and is intimately associated with the occurrence of the second bubble nucleation event. Textures of H O-CO -bearing glasses reproduce certain critical aspects of the Stromboli natural textures (bubble number densities, shapes, sizes, and distributions) and chemistries (residual volatile concentrations). Average bubble sizes, bubble size distribution (BSD), and bubble number density (BND) data are used together to estimate that the “golden” pumice magmas ascend from their source region in 43 to 128 min. volatiles fragmentation bubble nucleation magma ascent Stromboli magma degassing Basalt Michel Pichavant oth Enthalten in American mineralogist Washington, DC [u.a.] : Soc., 1916 101(2016), 9, Seite 1967-1985 (DE-627)129081795 (DE-600)3514-2 (DE-576)014414716 0003-004X nnns volume:101 year:2016 number:9 pages:1967-1985 http://dx.doi.org/10.2138/am-2016-5639 Volltext http://www.degruyter.com/doi/10.2138/am-2016-5639 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-CHE SSG-OLC-GEO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO GBV_ILN_21 GBV_ILN_22 GBV_ILN_40 GBV_ILN_65 GBV_ILN_70 GBV_ILN_188 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_4012 GBV_ILN_4112 GBV_ILN_4323 38.30 AVZ AR 101 2016 9 1967-1985
allfields_unstemmed	10.2138/am-2016-5639 doi PQ20161012 (DE-627)OLC1982561084 (DE-599)GBVOLC1982561084 (PRQ)c907-8f93a9ed415b6baa77c183c5490a3542df7aee48c79ccc0331044c6c4b4672580 (KEY)0120180820160000101000901967experimentalsimulationofbubblenucleationandmagmaas DE-627 ger DE-627 rakwb eng 550 540 DNB 38.30 bkl Nolwenn Le Gall verfasserin aut Experimental simulation of bubble nucleation and magma ascent in basaltic systems: Implications for Stromboli volcano 2016 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier The ascent of H O- and H O-CO -bearing basaltic melts from the deeper to the shallower part of the Stromboli magmatic system and their vesiculation were simulated from decompression experiments. A well-studied “golden” pumice produced during an intermediate- to a large-scale paroxysm was used as starting material. Volatile-bearing glasses were synthesized at an oxygen fugacity ranging from NNO-1.4 to +0.9, 1200 °C and 200 MPa. The resulting crystal- and bubble-free glasses were then isothermally (1200 °C) decompressed to final pressures ranging between 200 and 25 MPa, at a linear ascent rate of 1.5 m/s (or 39 kPa/s) prior to be rapidly quenched. Textures of post-decompression glasses that were characterized by X-ray computed tomography result from different mechanisms of degassing that include bubble nucleation, growth, coalescence, and outgassing, as well as fragmentation. Homogeneous bubble nucleation occurs for supersaturation pressures (difference between saturation pressure and pressure at which bubbles start to form homogeneously, Δ ) ≤ 50 MPa. In the CO -free melts, homogeneous nucleation occurs as two distinct events, the first at high (200–150 MPa) and the second at low (50–25 MPa) near the fragmentation level. In contrast, in the CO -bearing melts, multiple events of homogeneous bubble nucleation occur over a substantial interval along the decompression path. Bubble coalescence occurs in both H O- and H O-CO -bearing melts and is the more strongly marked between 100 and 50 MPa P . The CO -free melts follow equilibrium degassing until 100 MPa and are slightly supersaturated at 60 and 50 MPa , thus providing the driving force for the second bubble nucleation event. In comparison, disequilibrium degassing occurs systematically in the CO -bearing melts that retain high CO concentrations. Fragmentation was observed in some CO2-free charges decompressed to 25 MPa and is intimately associated with the occurrence of the second bubble nucleation event. Textures of H O-CO -bearing glasses reproduce certain critical aspects of the Stromboli natural textures (bubble number densities, shapes, sizes, and distributions) and chemistries (residual volatile concentrations). Average bubble sizes, bubble size distribution (BSD), and bubble number density (BND) data are used together to estimate that the “golden” pumice magmas ascend from their source region in 43 to 128 min. volatiles fragmentation bubble nucleation magma ascent Stromboli magma degassing Basalt Michel Pichavant oth Enthalten in American mineralogist Washington, DC [u.a.] : Soc., 1916 101(2016), 9, Seite 1967-1985 (DE-627)129081795 (DE-600)3514-2 (DE-576)014414716 0003-004X nnns volume:101 year:2016 number:9 pages:1967-1985 http://dx.doi.org/10.2138/am-2016-5639 Volltext http://www.degruyter.com/doi/10.2138/am-2016-5639 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-CHE SSG-OLC-GEO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO GBV_ILN_21 GBV_ILN_22 GBV_ILN_40 GBV_ILN_65 GBV_ILN_70 GBV_ILN_188 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_4012 GBV_ILN_4112 GBV_ILN_4323 38.30 AVZ AR 101 2016 9 1967-1985
allfieldsGer	10.2138/am-2016-5639 doi PQ20161012 (DE-627)OLC1982561084 (DE-599)GBVOLC1982561084 (PRQ)c907-8f93a9ed415b6baa77c183c5490a3542df7aee48c79ccc0331044c6c4b4672580 (KEY)0120180820160000101000901967experimentalsimulationofbubblenucleationandmagmaas DE-627 ger DE-627 rakwb eng 550 540 DNB 38.30 bkl Nolwenn Le Gall verfasserin aut Experimental simulation of bubble nucleation and magma ascent in basaltic systems: Implications for Stromboli volcano 2016 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier The ascent of H O- and H O-CO -bearing basaltic melts from the deeper to the shallower part of the Stromboli magmatic system and their vesiculation were simulated from decompression experiments. A well-studied “golden” pumice produced during an intermediate- to a large-scale paroxysm was used as starting material. Volatile-bearing glasses were synthesized at an oxygen fugacity ranging from NNO-1.4 to +0.9, 1200 °C and 200 MPa. The resulting crystal- and bubble-free glasses were then isothermally (1200 °C) decompressed to final pressures ranging between 200 and 25 MPa, at a linear ascent rate of 1.5 m/s (or 39 kPa/s) prior to be rapidly quenched. Textures of post-decompression glasses that were characterized by X-ray computed tomography result from different mechanisms of degassing that include bubble nucleation, growth, coalescence, and outgassing, as well as fragmentation. Homogeneous bubble nucleation occurs for supersaturation pressures (difference between saturation pressure and pressure at which bubbles start to form homogeneously, Δ ) ≤ 50 MPa. In the CO -free melts, homogeneous nucleation occurs as two distinct events, the first at high (200–150 MPa) and the second at low (50–25 MPa) near the fragmentation level. In contrast, in the CO -bearing melts, multiple events of homogeneous bubble nucleation occur over a substantial interval along the decompression path. Bubble coalescence occurs in both H O- and H O-CO -bearing melts and is the more strongly marked between 100 and 50 MPa P . The CO -free melts follow equilibrium degassing until 100 MPa and are slightly supersaturated at 60 and 50 MPa , thus providing the driving force for the second bubble nucleation event. In comparison, disequilibrium degassing occurs systematically in the CO -bearing melts that retain high CO concentrations. Fragmentation was observed in some CO2-free charges decompressed to 25 MPa and is intimately associated with the occurrence of the second bubble nucleation event. Textures of H O-CO -bearing glasses reproduce certain critical aspects of the Stromboli natural textures (bubble number densities, shapes, sizes, and distributions) and chemistries (residual volatile concentrations). Average bubble sizes, bubble size distribution (BSD), and bubble number density (BND) data are used together to estimate that the “golden” pumice magmas ascend from their source region in 43 to 128 min. volatiles fragmentation bubble nucleation magma ascent Stromboli magma degassing Basalt Michel Pichavant oth Enthalten in American mineralogist Washington, DC [u.a.] : Soc., 1916 101(2016), 9, Seite 1967-1985 (DE-627)129081795 (DE-600)3514-2 (DE-576)014414716 0003-004X nnns volume:101 year:2016 number:9 pages:1967-1985 http://dx.doi.org/10.2138/am-2016-5639 Volltext http://www.degruyter.com/doi/10.2138/am-2016-5639 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-CHE SSG-OLC-GEO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO GBV_ILN_21 GBV_ILN_22 GBV_ILN_40 GBV_ILN_65 GBV_ILN_70 GBV_ILN_188 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_4012 GBV_ILN_4112 GBV_ILN_4323 38.30 AVZ AR 101 2016 9 1967-1985
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language	English
source	Enthalten in American mineralogist 101(2016), 9, Seite 1967-1985 volume:101 year:2016 number:9 pages:1967-1985
sourceStr	Enthalten in American mineralogist 101(2016), 9, Seite 1967-1985 volume:101 year:2016 number:9 pages:1967-1985
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topic_facet	volatiles fragmentation bubble nucleation magma ascent Stromboli magma degassing Basalt
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container_title	American mineralogist
authorswithroles_txt_mv	Nolwenn Le Gall @@aut@@ Michel Pichavant @@oth@@
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author	Nolwenn Le Gall
spellingShingle	Nolwenn Le Gall ddc 550 bkl 38.30 misc volatiles misc fragmentation misc bubble nucleation misc magma ascent misc Stromboli misc magma degassing misc Basalt Experimental simulation of bubble nucleation and magma ascent in basaltic systems: Implications for Stromboli volcano
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title	Experimental simulation of bubble nucleation and magma ascent in basaltic systems: Implications for Stromboli volcano
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title_full	Experimental simulation of bubble nucleation and magma ascent in basaltic systems: Implications for Stromboli volcano
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title_sort	experimental simulation of bubble nucleation and magma ascent in basaltic systems: implications for stromboli volcano
title_auth	Experimental simulation of bubble nucleation and magma ascent in basaltic systems: Implications for Stromboli volcano
abstract	The ascent of H O- and H O-CO -bearing basaltic melts from the deeper to the shallower part of the Stromboli magmatic system and their vesiculation were simulated from decompression experiments. A well-studied “golden” pumice produced during an intermediate- to a large-scale paroxysm was used as starting material. Volatile-bearing glasses were synthesized at an oxygen fugacity ranging from NNO-1.4 to +0.9, 1200 °C and 200 MPa. The resulting crystal- and bubble-free glasses were then isothermally (1200 °C) decompressed to final pressures ranging between 200 and 25 MPa, at a linear ascent rate of 1.5 m/s (or 39 kPa/s) prior to be rapidly quenched. Textures of post-decompression glasses that were characterized by X-ray computed tomography result from different mechanisms of degassing that include bubble nucleation, growth, coalescence, and outgassing, as well as fragmentation. Homogeneous bubble nucleation occurs for supersaturation pressures (difference between saturation pressure and pressure at which bubbles start to form homogeneously, Δ ) ≤ 50 MPa. In the CO -free melts, homogeneous nucleation occurs as two distinct events, the first at high (200–150 MPa) and the second at low (50–25 MPa) near the fragmentation level. In contrast, in the CO -bearing melts, multiple events of homogeneous bubble nucleation occur over a substantial interval along the decompression path. Bubble coalescence occurs in both H O- and H O-CO -bearing melts and is the more strongly marked between 100 and 50 MPa P . The CO -free melts follow equilibrium degassing until 100 MPa and are slightly supersaturated at 60 and 50 MPa , thus providing the driving force for the second bubble nucleation event. In comparison, disequilibrium degassing occurs systematically in the CO -bearing melts that retain high CO concentrations. Fragmentation was observed in some CO2-free charges decompressed to 25 MPa and is intimately associated with the occurrence of the second bubble nucleation event. Textures of H O-CO -bearing glasses reproduce certain critical aspects of the Stromboli natural textures (bubble number densities, shapes, sizes, and distributions) and chemistries (residual volatile concentrations). Average bubble sizes, bubble size distribution (BSD), and bubble number density (BND) data are used together to estimate that the “golden” pumice magmas ascend from their source region in 43 to 128 min.
abstractGer	The ascent of H O- and H O-CO -bearing basaltic melts from the deeper to the shallower part of the Stromboli magmatic system and their vesiculation were simulated from decompression experiments. A well-studied “golden” pumice produced during an intermediate- to a large-scale paroxysm was used as starting material. Volatile-bearing glasses were synthesized at an oxygen fugacity ranging from NNO-1.4 to +0.9, 1200 °C and 200 MPa. The resulting crystal- and bubble-free glasses were then isothermally (1200 °C) decompressed to final pressures ranging between 200 and 25 MPa, at a linear ascent rate of 1.5 m/s (or 39 kPa/s) prior to be rapidly quenched. Textures of post-decompression glasses that were characterized by X-ray computed tomography result from different mechanisms of degassing that include bubble nucleation, growth, coalescence, and outgassing, as well as fragmentation. Homogeneous bubble nucleation occurs for supersaturation pressures (difference between saturation pressure and pressure at which bubbles start to form homogeneously, Δ ) ≤ 50 MPa. In the CO -free melts, homogeneous nucleation occurs as two distinct events, the first at high (200–150 MPa) and the second at low (50–25 MPa) near the fragmentation level. In contrast, in the CO -bearing melts, multiple events of homogeneous bubble nucleation occur over a substantial interval along the decompression path. Bubble coalescence occurs in both H O- and H O-CO -bearing melts and is the more strongly marked between 100 and 50 MPa P . The CO -free melts follow equilibrium degassing until 100 MPa and are slightly supersaturated at 60 and 50 MPa , thus providing the driving force for the second bubble nucleation event. In comparison, disequilibrium degassing occurs systematically in the CO -bearing melts that retain high CO concentrations. Fragmentation was observed in some CO2-free charges decompressed to 25 MPa and is intimately associated with the occurrence of the second bubble nucleation event. Textures of H O-CO -bearing glasses reproduce certain critical aspects of the Stromboli natural textures (bubble number densities, shapes, sizes, and distributions) and chemistries (residual volatile concentrations). Average bubble sizes, bubble size distribution (BSD), and bubble number density (BND) data are used together to estimate that the “golden” pumice magmas ascend from their source region in 43 to 128 min.
abstract_unstemmed	The ascent of H O- and H O-CO -bearing basaltic melts from the deeper to the shallower part of the Stromboli magmatic system and their vesiculation were simulated from decompression experiments. A well-studied “golden” pumice produced during an intermediate- to a large-scale paroxysm was used as starting material. Volatile-bearing glasses were synthesized at an oxygen fugacity ranging from NNO-1.4 to +0.9, 1200 °C and 200 MPa. The resulting crystal- and bubble-free glasses were then isothermally (1200 °C) decompressed to final pressures ranging between 200 and 25 MPa, at a linear ascent rate of 1.5 m/s (or 39 kPa/s) prior to be rapidly quenched. Textures of post-decompression glasses that were characterized by X-ray computed tomography result from different mechanisms of degassing that include bubble nucleation, growth, coalescence, and outgassing, as well as fragmentation. Homogeneous bubble nucleation occurs for supersaturation pressures (difference between saturation pressure and pressure at which bubbles start to form homogeneously, Δ ) ≤ 50 MPa. In the CO -free melts, homogeneous nucleation occurs as two distinct events, the first at high (200–150 MPa) and the second at low (50–25 MPa) near the fragmentation level. In contrast, in the CO -bearing melts, multiple events of homogeneous bubble nucleation occur over a substantial interval along the decompression path. Bubble coalescence occurs in both H O- and H O-CO -bearing melts and is the more strongly marked between 100 and 50 MPa P . The CO -free melts follow equilibrium degassing until 100 MPa and are slightly supersaturated at 60 and 50 MPa , thus providing the driving force for the second bubble nucleation event. In comparison, disequilibrium degassing occurs systematically in the CO -bearing melts that retain high CO concentrations. Fragmentation was observed in some CO2-free charges decompressed to 25 MPa and is intimately associated with the occurrence of the second bubble nucleation event. Textures of H O-CO -bearing glasses reproduce certain critical aspects of the Stromboli natural textures (bubble number densities, shapes, sizes, and distributions) and chemistries (residual volatile concentrations). Average bubble sizes, bubble size distribution (BSD), and bubble number density (BND) data are used together to estimate that the “golden” pumice magmas ascend from their source region in 43 to 128 min.
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container_issue	9
title_short	Experimental simulation of bubble nucleation and magma ascent in basaltic systems: Implications for Stromboli volcano
url	http://dx.doi.org/10.2138/am-2016-5639 http://www.degruyter.com/doi/10.2138/am-2016-5639
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up_date	2024-07-03T17:44:47.967Z
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In the CO -free melts, homogeneous nucleation occurs as two distinct events, the first at high (200–150 MPa) and the second at low (50–25 MPa) near the fragmentation level. In contrast, in the CO -bearing melts, multiple events of homogeneous bubble nucleation occur over a substantial interval along the decompression path. Bubble coalescence occurs in both H O- and H O-CO -bearing melts and is the more strongly marked between 100 and 50 MPa P . The CO -free melts follow equilibrium degassing until 100 MPa and are slightly supersaturated at 60 and 50 MPa , thus providing the driving force for the second bubble nucleation event. In comparison, disequilibrium degassing occurs systematically in the CO -bearing melts that retain high CO concentrations. Fragmentation was observed in some CO2-free charges decompressed to 25 MPa and is intimately associated with the occurrence of the second bubble nucleation event. Textures of H O-CO -bearing glasses reproduce certain critical aspects of the Stromboli natural textures (bubble number densities, shapes, sizes, and distributions) and chemistries (residual volatile concentrations). Average bubble sizes, bubble size distribution (BSD), and bubble number density (BND) data are used together to estimate that the “golden” pumice magmas ascend from their source region in 43 to 128 min.</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">volatiles</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">fragmentation</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">bubble nucleation</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">magma ascent</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Stromboli</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">magma degassing</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Basalt</subfield></datafield><datafield tag="700" ind1="0" ind2=" "><subfield code="a">Michel Pichavant</subfield><subfield code="4">oth</subfield></datafield><datafield tag="773" ind1="0" ind2="8"><subfield code="i">Enthalten in</subfield><subfield code="t">American mineralogist</subfield><subfield code="d">Washington, DC [u.a.] : Soc., 1916</subfield><subfield code="g">101(2016), 9, Seite 1967-1985</subfield><subfield code="w">(DE-627)129081795</subfield><subfield code="w">(DE-600)3514-2</subfield><subfield code="w">(DE-576)014414716</subfield><subfield code="x">0003-004X</subfield><subfield code="7">nnns</subfield></datafield><datafield tag="773" ind1="1" ind2="8"><subfield code="g">volume:101</subfield><subfield code="g">year:2016</subfield><subfield code="g">number:9</subfield><subfield code="g">pages:1967-1985</subfield></datafield><datafield tag="856" ind1="4" ind2="1"><subfield code="u">http://dx.doi.org/10.2138/am-2016-5639</subfield><subfield code="3">Volltext</subfield></datafield><datafield tag="856" ind1="4" ind2="2"><subfield code="u">http://www.degruyter.com/doi/10.2138/am-2016-5639</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_USEFLAG_A</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">SYSFLAG_A</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_OLC</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">SSG-OLC-CHE</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">SSG-OLC-GEO</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">SSG-OLC-PHA</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">SSG-OLC-DE-84</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">SSG-OPC-GGO</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_21</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_22</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_40</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_65</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_70</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_188</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_2010</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_2015</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_4012</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_4112</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_4323</subfield></datafield><datafield tag="936" ind1="b" ind2="k"><subfield code="a">38.30</subfield><subfield code="q">AVZ</subfield></datafield><datafield tag="951" ind1=" " ind2=" "><subfield code="a">AR</subfield></datafield><datafield tag="952" ind1=" " ind2=" "><subfield code="d">101</subfield><subfield code="j">2016</subfield><subfield code="e">9</subfield><subfield code="h">1967-1985</subfield></datafield></record></collection>
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Experimental simulation of bubble nucleation and magma ascent in basaltic systems: Implications for Stromboli volcano

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