Partial fusion of basic granulites at 5 to 15 kbar: implications for the origin of TTG magmas

Abstract Partial fusion experiments with basic granulites (S6, S37) believed to represent the lower crust beneath the Eifel region (Germany) were performed at pressures from 5 to 15 kbar. Water-undersaturated experiments were carried out in the presence of 1 wt% $ H_{2} $O plus 2.44 or 0.81 wt% $ CO_{2} $ equivalent to mole fractions of $ H_{2} $O/($ H_{2} $O + $ CO_{2} $) of 0.5 and 0.75, respectively, of the volatile components added. At temperatures from 850 to 1100 °C the weight proportions of melt range from 7 to 30 %. Melt compositions change from trondhjemitic over tonalitic to dioritic with increasing degree of partial melting. Crystalline residua are plagioclase/pyroxene dominated at 5 kbar to garnet/pyroxene dominated at 15␣kbar. Dehydration melting was studied in granulite S35 similar in composition to S6. The magmatic precursors of the granulite xenoliths used in this study had geochemical characteristics of cumulate gabbro (metagabbro S37) and evolved melts (metabasalts S6, S35), respectively. Melts from granulite S37 match the major element compositions of natural trondhjemites and tonalites. At 5 kbar, their $ Al_{2} $$ O_{3} $ is relatively low, similar to tonalites from ophiolites. At 15 kbar, $ Al_{2} $$ O_{3} $ in the melts is high due to the near absence of plagioclase in the crystalline residua. The $ Al_{2} $$ O_{3} $ concentrations in 15 kbar melts from S6 (˜20 wt%) are higher than in natural tonalites. Depth constraints on the formation of tonalitic magmas in the continental crust are provided by REE (rare earth element) patterns of the synthetic melts calculated from the known REE abundances in metagabbro S37 and metabasalt S6 assuming batch melting and using partition coefficients from the literature. The REE patterns of tonalites from active continental margins and Archean trondhjemite-tonalite-granodiorite␣associations low in REE with $ La_{N} $ (chondrite normalised) from 10 to 30 and $ Yb_{N} $ from 1 to 2 are reproduced at pressures of 10 and 12.5 kbar from metagabbro S37 which displays a slightly L(light)REE enriched pattern with $ La_{N} $ = 8 and $ Yb_{N} $ = 3. Natural tonalites with $ La_{N} $ from 30 to 100 require a source richer in REE than granulite S37. At 15 kbar, H(heavy)$ REE_{N} $ in melts from granulite S37 are depressed below the level observed in natural tonalites due to the high proportion of garnet (>30 wt%) in the residue. Melts from metabasalt S6 (enriched in REE with $ La_{N} $ = 38 and $ Yb_{N} $ = 16) do not match the REE characteristics of natural tonalites under any conditions. Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Springer, Wilhelm [verfasserIn] Seck, Hans Adolf

Format:	Artikel
Sprache:	Englisch

Erschienen:	1997

Schlagwörter:	Continental Crust Continental Margin Active Continental Margin Major Element Composition Dehydration Melting

Systematik:	TE 1000

Anmerkung:	© Springer-Verlag Berlin Heidelberg 1997

Übergeordnetes Werk:	Enthalten in: Contributions to mineralogy and petrology - Springer-Verlag, 1966, 127(1997), 1-2 vom: März, Seite 30-45
Übergeordnetes Werk:	volume:127 ; year:1997 ; number:1-2 ; month:03 ; pages:30-45

Links:	Volltext

DOI / URN:	10.1007/s004100050263

Katalog-ID:	OLC2070516083

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520			\|a Abstract Partial fusion experiments with basic granulites (S6, S37) believed to represent the lower crust beneath the Eifel region (Germany) were performed at pressures from 5 to 15 kbar. Water-undersaturated experiments were carried out in the presence of 1 wt% $ H_{2} $O plus 2.44 or 0.81 wt% $ CO_{2} $ equivalent to mole fractions of $ H_{2} $O/($ H_{2} $O + $ CO_{2} $) of 0.5 and 0.75, respectively, of the volatile components added. At temperatures from 850 to 1100 °C the weight proportions of melt range from 7 to 30 %. Melt compositions change from trondhjemitic over tonalitic to dioritic with increasing degree of partial melting. Crystalline residua are plagioclase/pyroxene dominated at 5 kbar to garnet/pyroxene dominated at 15␣kbar. Dehydration melting was studied in granulite S35 similar in composition to S6. The magmatic precursors of the granulite xenoliths used in this study had geochemical characteristics of cumulate gabbro (metagabbro S37) and evolved melts (metabasalts S6, S35), respectively. Melts from granulite S37 match the major element compositions of natural trondhjemites and tonalites. At 5 kbar, their $ Al_{2} $$ O_{3} $ is relatively low, similar to tonalites from ophiolites. At 15 kbar, $ Al_{2} $$ O_{3} $ in the melts is high due to the near absence of plagioclase in the crystalline residua. The $ Al_{2} $$ O_{3} $ concentrations in 15 kbar melts from S6 (˜20 wt%) are higher than in natural tonalites. Depth constraints on the formation of tonalitic magmas in the continental crust are provided by REE (rare earth element) patterns of the synthetic melts calculated from the known REE abundances in metagabbro S37 and metabasalt S6 assuming batch melting and using partition coefficients from the literature. The REE patterns of tonalites from active continental margins and Archean trondhjemite-tonalite-granodiorite␣associations low in REE with $ La_{N} $ (chondrite normalised) from 10 to 30 and $ Yb_{N} $ from 1 to 2 are reproduced at pressures of 10 and 12.5 kbar from metagabbro S37 which displays a slightly L(light)REE enriched pattern with $ La_{N} $ = 8 and $ Yb_{N} $ = 3. Natural tonalites with $ La_{N} $ from 30 to 100 require a source richer in REE than granulite S37. At 15 kbar, H(heavy)$ REE_{N} $ in melts from granulite S37 are depressed below the level observed in natural tonalites due to the high proportion of garnet (>30 wt%) in the residue. Melts from metabasalt S6 (enriched in REE with $ La_{N} $ = 38 and $ Yb_{N} $ = 16) do not match the REE characteristics of natural tonalites under any conditions.
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allfields	10.1007/s004100050263 doi (DE-627)OLC2070516083 (DE-He213)s004100050263-p DE-627 ger DE-627 rakwb eng 550 VZ 13 ssgn TE 1000 VZ rvk Springer, Wilhelm verfasserin aut Partial fusion of basic granulites at 5 to 15 kbar: implications for the origin of TTG magmas 1997 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag Berlin Heidelberg 1997 Abstract Partial fusion experiments with basic granulites (S6, S37) believed to represent the lower crust beneath the Eifel region (Germany) were performed at pressures from 5 to 15 kbar. Water-undersaturated experiments were carried out in the presence of 1 wt% $ H_{2} $O plus 2.44 or 0.81 wt% $ CO_{2} $ equivalent to mole fractions of $ H_{2} $O/($ H_{2} $O + $ CO_{2} $) of 0.5 and 0.75, respectively, of the volatile components added. At temperatures from 850 to 1100 °C the weight proportions of melt range from 7 to 30 %. Melt compositions change from trondhjemitic over tonalitic to dioritic with increasing degree of partial melting. Crystalline residua are plagioclase/pyroxene dominated at 5 kbar to garnet/pyroxene dominated at 15␣kbar. Dehydration melting was studied in granulite S35 similar in composition to S6. The magmatic precursors of the granulite xenoliths used in this study had geochemical characteristics of cumulate gabbro (metagabbro S37) and evolved melts (metabasalts S6, S35), respectively. Melts from granulite S37 match the major element compositions of natural trondhjemites and tonalites. At 5 kbar, their $ Al_{2} $$ O_{3} $ is relatively low, similar to tonalites from ophiolites. At 15 kbar, $ Al_{2} $$ O_{3} $ in the melts is high due to the near absence of plagioclase in the crystalline residua. The $ Al_{2} $$ O_{3} $ concentrations in 15 kbar melts from S6 (˜20 wt%) are higher than in natural tonalites. Depth constraints on the formation of tonalitic magmas in the continental crust are provided by REE (rare earth element) patterns of the synthetic melts calculated from the known REE abundances in metagabbro S37 and metabasalt S6 assuming batch melting and using partition coefficients from the literature. The REE patterns of tonalites from active continental margins and Archean trondhjemite-tonalite-granodiorite␣associations low in REE with $ La_{N} $ (chondrite normalised) from 10 to 30 and $ Yb_{N} $ from 1 to 2 are reproduced at pressures of 10 and 12.5 kbar from metagabbro S37 which displays a slightly L(light)REE enriched pattern with $ La_{N} $ = 8 and $ Yb_{N} $ = 3. Natural tonalites with $ La_{N} $ from 30 to 100 require a source richer in REE than granulite S37. At 15 kbar, H(heavy)$ REE_{N} $ in melts from granulite S37 are depressed below the level observed in natural tonalites due to the high proportion of garnet (>30 wt%) in the residue. Melts from metabasalt S6 (enriched in REE with $ La_{N} $ = 38 and $ Yb_{N} $ = 16) do not match the REE characteristics of natural tonalites under any conditions. Continental Crust Continental Margin Active Continental Margin Major Element Composition Dehydration Melting Seck, Hans Adolf aut Enthalten in Contributions to mineralogy and petrology Springer-Verlag, 1966 127(1997), 1-2 vom: März, Seite 30-45 (DE-627)129068721 (DE-600)1616-0 (DE-576)014400367 0010-7999 nnns volume:127 year:1997 number:1-2 month:03 pages:30-45 https://doi.org/10.1007/s004100050263 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_31 GBV_ILN_40 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2004 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_2018 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4277 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4311 GBV_ILN_4319 GBV_ILN_4323 TE 1000 AR 127 1997 1-2 03 30-45
spelling	10.1007/s004100050263 doi (DE-627)OLC2070516083 (DE-He213)s004100050263-p DE-627 ger DE-627 rakwb eng 550 VZ 13 ssgn TE 1000 VZ rvk Springer, Wilhelm verfasserin aut Partial fusion of basic granulites at 5 to 15 kbar: implications for the origin of TTG magmas 1997 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag Berlin Heidelberg 1997 Abstract Partial fusion experiments with basic granulites (S6, S37) believed to represent the lower crust beneath the Eifel region (Germany) were performed at pressures from 5 to 15 kbar. Water-undersaturated experiments were carried out in the presence of 1 wt% $ H_{2} $O plus 2.44 or 0.81 wt% $ CO_{2} $ equivalent to mole fractions of $ H_{2} $O/($ H_{2} $O + $ CO_{2} $) of 0.5 and 0.75, respectively, of the volatile components added. At temperatures from 850 to 1100 °C the weight proportions of melt range from 7 to 30 %. Melt compositions change from trondhjemitic over tonalitic to dioritic with increasing degree of partial melting. Crystalline residua are plagioclase/pyroxene dominated at 5 kbar to garnet/pyroxene dominated at 15␣kbar. Dehydration melting was studied in granulite S35 similar in composition to S6. The magmatic precursors of the granulite xenoliths used in this study had geochemical characteristics of cumulate gabbro (metagabbro S37) and evolved melts (metabasalts S6, S35), respectively. Melts from granulite S37 match the major element compositions of natural trondhjemites and tonalites. At 5 kbar, their $ Al_{2} $$ O_{3} $ is relatively low, similar to tonalites from ophiolites. At 15 kbar, $ Al_{2} $$ O_{3} $ in the melts is high due to the near absence of plagioclase in the crystalline residua. The $ Al_{2} $$ O_{3} $ concentrations in 15 kbar melts from S6 (˜20 wt%) are higher than in natural tonalites. Depth constraints on the formation of tonalitic magmas in the continental crust are provided by REE (rare earth element) patterns of the synthetic melts calculated from the known REE abundances in metagabbro S37 and metabasalt S6 assuming batch melting and using partition coefficients from the literature. The REE patterns of tonalites from active continental margins and Archean trondhjemite-tonalite-granodiorite␣associations low in REE with $ La_{N} $ (chondrite normalised) from 10 to 30 and $ Yb_{N} $ from 1 to 2 are reproduced at pressures of 10 and 12.5 kbar from metagabbro S37 which displays a slightly L(light)REE enriched pattern with $ La_{N} $ = 8 and $ Yb_{N} $ = 3. Natural tonalites with $ La_{N} $ from 30 to 100 require a source richer in REE than granulite S37. At 15 kbar, H(heavy)$ REE_{N} $ in melts from granulite S37 are depressed below the level observed in natural tonalites due to the high proportion of garnet (>30 wt%) in the residue. Melts from metabasalt S6 (enriched in REE with $ La_{N} $ = 38 and $ Yb_{N} $ = 16) do not match the REE characteristics of natural tonalites under any conditions. Continental Crust Continental Margin Active Continental Margin Major Element Composition Dehydration Melting Seck, Hans Adolf aut Enthalten in Contributions to mineralogy and petrology Springer-Verlag, 1966 127(1997), 1-2 vom: März, Seite 30-45 (DE-627)129068721 (DE-600)1616-0 (DE-576)014400367 0010-7999 nnns volume:127 year:1997 number:1-2 month:03 pages:30-45 https://doi.org/10.1007/s004100050263 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_31 GBV_ILN_40 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2004 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_2018 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4277 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4311 GBV_ILN_4319 GBV_ILN_4323 TE 1000 AR 127 1997 1-2 03 30-45
allfields_unstemmed	10.1007/s004100050263 doi (DE-627)OLC2070516083 (DE-He213)s004100050263-p DE-627 ger DE-627 rakwb eng 550 VZ 13 ssgn TE 1000 VZ rvk Springer, Wilhelm verfasserin aut Partial fusion of basic granulites at 5 to 15 kbar: implications for the origin of TTG magmas 1997 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag Berlin Heidelberg 1997 Abstract Partial fusion experiments with basic granulites (S6, S37) believed to represent the lower crust beneath the Eifel region (Germany) were performed at pressures from 5 to 15 kbar. Water-undersaturated experiments were carried out in the presence of 1 wt% $ H_{2} $O plus 2.44 or 0.81 wt% $ CO_{2} $ equivalent to mole fractions of $ H_{2} $O/($ H_{2} $O + $ CO_{2} $) of 0.5 and 0.75, respectively, of the volatile components added. At temperatures from 850 to 1100 °C the weight proportions of melt range from 7 to 30 %. Melt compositions change from trondhjemitic over tonalitic to dioritic with increasing degree of partial melting. Crystalline residua are plagioclase/pyroxene dominated at 5 kbar to garnet/pyroxene dominated at 15␣kbar. Dehydration melting was studied in granulite S35 similar in composition to S6. The magmatic precursors of the granulite xenoliths used in this study had geochemical characteristics of cumulate gabbro (metagabbro S37) and evolved melts (metabasalts S6, S35), respectively. Melts from granulite S37 match the major element compositions of natural trondhjemites and tonalites. At 5 kbar, their $ Al_{2} $$ O_{3} $ is relatively low, similar to tonalites from ophiolites. At 15 kbar, $ Al_{2} $$ O_{3} $ in the melts is high due to the near absence of plagioclase in the crystalline residua. The $ Al_{2} $$ O_{3} $ concentrations in 15 kbar melts from S6 (˜20 wt%) are higher than in natural tonalites. Depth constraints on the formation of tonalitic magmas in the continental crust are provided by REE (rare earth element) patterns of the synthetic melts calculated from the known REE abundances in metagabbro S37 and metabasalt S6 assuming batch melting and using partition coefficients from the literature. The REE patterns of tonalites from active continental margins and Archean trondhjemite-tonalite-granodiorite␣associations low in REE with $ La_{N} $ (chondrite normalised) from 10 to 30 and $ Yb_{N} $ from 1 to 2 are reproduced at pressures of 10 and 12.5 kbar from metagabbro S37 which displays a slightly L(light)REE enriched pattern with $ La_{N} $ = 8 and $ Yb_{N} $ = 3. Natural tonalites with $ La_{N} $ from 30 to 100 require a source richer in REE than granulite S37. At 15 kbar, H(heavy)$ REE_{N} $ in melts from granulite S37 are depressed below the level observed in natural tonalites due to the high proportion of garnet (>30 wt%) in the residue. Melts from metabasalt S6 (enriched in REE with $ La_{N} $ = 38 and $ Yb_{N} $ = 16) do not match the REE characteristics of natural tonalites under any conditions. Continental Crust Continental Margin Active Continental Margin Major Element Composition Dehydration Melting Seck, Hans Adolf aut Enthalten in Contributions to mineralogy and petrology Springer-Verlag, 1966 127(1997), 1-2 vom: März, Seite 30-45 (DE-627)129068721 (DE-600)1616-0 (DE-576)014400367 0010-7999 nnns volume:127 year:1997 number:1-2 month:03 pages:30-45 https://doi.org/10.1007/s004100050263 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_31 GBV_ILN_40 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2004 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_2018 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4277 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4311 GBV_ILN_4319 GBV_ILN_4323 TE 1000 AR 127 1997 1-2 03 30-45
allfieldsGer	10.1007/s004100050263 doi (DE-627)OLC2070516083 (DE-He213)s004100050263-p DE-627 ger DE-627 rakwb eng 550 VZ 13 ssgn TE 1000 VZ rvk Springer, Wilhelm verfasserin aut Partial fusion of basic granulites at 5 to 15 kbar: implications for the origin of TTG magmas 1997 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag Berlin Heidelberg 1997 Abstract Partial fusion experiments with basic granulites (S6, S37) believed to represent the lower crust beneath the Eifel region (Germany) were performed at pressures from 5 to 15 kbar. Water-undersaturated experiments were carried out in the presence of 1 wt% $ H_{2} $O plus 2.44 or 0.81 wt% $ CO_{2} $ equivalent to mole fractions of $ H_{2} $O/($ H_{2} $O + $ CO_{2} $) of 0.5 and 0.75, respectively, of the volatile components added. At temperatures from 850 to 1100 °C the weight proportions of melt range from 7 to 30 %. Melt compositions change from trondhjemitic over tonalitic to dioritic with increasing degree of partial melting. Crystalline residua are plagioclase/pyroxene dominated at 5 kbar to garnet/pyroxene dominated at 15␣kbar. Dehydration melting was studied in granulite S35 similar in composition to S6. The magmatic precursors of the granulite xenoliths used in this study had geochemical characteristics of cumulate gabbro (metagabbro S37) and evolved melts (metabasalts S6, S35), respectively. Melts from granulite S37 match the major element compositions of natural trondhjemites and tonalites. At 5 kbar, their $ Al_{2} $$ O_{3} $ is relatively low, similar to tonalites from ophiolites. At 15 kbar, $ Al_{2} $$ O_{3} $ in the melts is high due to the near absence of plagioclase in the crystalline residua. The $ Al_{2} $$ O_{3} $ concentrations in 15 kbar melts from S6 (˜20 wt%) are higher than in natural tonalites. Depth constraints on the formation of tonalitic magmas in the continental crust are provided by REE (rare earth element) patterns of the synthetic melts calculated from the known REE abundances in metagabbro S37 and metabasalt S6 assuming batch melting and using partition coefficients from the literature. The REE patterns of tonalites from active continental margins and Archean trondhjemite-tonalite-granodiorite␣associations low in REE with $ La_{N} $ (chondrite normalised) from 10 to 30 and $ Yb_{N} $ from 1 to 2 are reproduced at pressures of 10 and 12.5 kbar from metagabbro S37 which displays a slightly L(light)REE enriched pattern with $ La_{N} $ = 8 and $ Yb_{N} $ = 3. Natural tonalites with $ La_{N} $ from 30 to 100 require a source richer in REE than granulite S37. At 15 kbar, H(heavy)$ REE_{N} $ in melts from granulite S37 are depressed below the level observed in natural tonalites due to the high proportion of garnet (>30 wt%) in the residue. Melts from metabasalt S6 (enriched in REE with $ La_{N} $ = 38 and $ Yb_{N} $ = 16) do not match the REE characteristics of natural tonalites under any conditions. Continental Crust Continental Margin Active Continental Margin Major Element Composition Dehydration Melting Seck, Hans Adolf aut Enthalten in Contributions to mineralogy and petrology Springer-Verlag, 1966 127(1997), 1-2 vom: März, Seite 30-45 (DE-627)129068721 (DE-600)1616-0 (DE-576)014400367 0010-7999 nnns volume:127 year:1997 number:1-2 month:03 pages:30-45 https://doi.org/10.1007/s004100050263 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_31 GBV_ILN_40 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2004 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_2018 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4277 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4311 GBV_ILN_4319 GBV_ILN_4323 TE 1000 AR 127 1997 1-2 03 30-45
allfieldsSound	10.1007/s004100050263 doi (DE-627)OLC2070516083 (DE-He213)s004100050263-p DE-627 ger DE-627 rakwb eng 550 VZ 13 ssgn TE 1000 VZ rvk Springer, Wilhelm verfasserin aut Partial fusion of basic granulites at 5 to 15 kbar: implications for the origin of TTG magmas 1997 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag Berlin Heidelberg 1997 Abstract Partial fusion experiments with basic granulites (S6, S37) believed to represent the lower crust beneath the Eifel region (Germany) were performed at pressures from 5 to 15 kbar. Water-undersaturated experiments were carried out in the presence of 1 wt% $ H_{2} $O plus 2.44 or 0.81 wt% $ CO_{2} $ equivalent to mole fractions of $ H_{2} $O/($ H_{2} $O + $ CO_{2} $) of 0.5 and 0.75, respectively, of the volatile components added. At temperatures from 850 to 1100 °C the weight proportions of melt range from 7 to 30 %. Melt compositions change from trondhjemitic over tonalitic to dioritic with increasing degree of partial melting. Crystalline residua are plagioclase/pyroxene dominated at 5 kbar to garnet/pyroxene dominated at 15␣kbar. Dehydration melting was studied in granulite S35 similar in composition to S6. The magmatic precursors of the granulite xenoliths used in this study had geochemical characteristics of cumulate gabbro (metagabbro S37) and evolved melts (metabasalts S6, S35), respectively. Melts from granulite S37 match the major element compositions of natural trondhjemites and tonalites. At 5 kbar, their $ Al_{2} $$ O_{3} $ is relatively low, similar to tonalites from ophiolites. At 15 kbar, $ Al_{2} $$ O_{3} $ in the melts is high due to the near absence of plagioclase in the crystalline residua. The $ Al_{2} $$ O_{3} $ concentrations in 15 kbar melts from S6 (˜20 wt%) are higher than in natural tonalites. Depth constraints on the formation of tonalitic magmas in the continental crust are provided by REE (rare earth element) patterns of the synthetic melts calculated from the known REE abundances in metagabbro S37 and metabasalt S6 assuming batch melting and using partition coefficients from the literature. The REE patterns of tonalites from active continental margins and Archean trondhjemite-tonalite-granodiorite␣associations low in REE with $ La_{N} $ (chondrite normalised) from 10 to 30 and $ Yb_{N} $ from 1 to 2 are reproduced at pressures of 10 and 12.5 kbar from metagabbro S37 which displays a slightly L(light)REE enriched pattern with $ La_{N} $ = 8 and $ Yb_{N} $ = 3. Natural tonalites with $ La_{N} $ from 30 to 100 require a source richer in REE than granulite S37. At 15 kbar, H(heavy)$ REE_{N} $ in melts from granulite S37 are depressed below the level observed in natural tonalites due to the high proportion of garnet (>30 wt%) in the residue. Melts from metabasalt S6 (enriched in REE with $ La_{N} $ = 38 and $ Yb_{N} $ = 16) do not match the REE characteristics of natural tonalites under any conditions. Continental Crust Continental Margin Active Continental Margin Major Element Composition Dehydration Melting Seck, Hans Adolf aut Enthalten in Contributions to mineralogy and petrology Springer-Verlag, 1966 127(1997), 1-2 vom: März, Seite 30-45 (DE-627)129068721 (DE-600)1616-0 (DE-576)014400367 0010-7999 nnns volume:127 year:1997 number:1-2 month:03 pages:30-45 https://doi.org/10.1007/s004100050263 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_31 GBV_ILN_40 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2004 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_2018 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4277 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4311 GBV_ILN_4319 GBV_ILN_4323 TE 1000 AR 127 1997 1-2 03 30-45
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author	Springer, Wilhelm
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topic_title	550 VZ 13 ssgn TE 1000 VZ rvk Partial fusion of basic granulites at 5 to 15 kbar: implications for the origin of TTG magmas Continental Crust Continental Margin Active Continental Margin Major Element Composition Dehydration Melting
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title	Partial fusion of basic granulites at 5 to 15 kbar: implications for the origin of TTG magmas
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title_sort	partial fusion of basic granulites at 5 to 15 kbar: implications for the origin of ttg magmas
title_auth	Partial fusion of basic granulites at 5 to 15 kbar: implications for the origin of TTG magmas
abstract	Abstract Partial fusion experiments with basic granulites (S6, S37) believed to represent the lower crust beneath the Eifel region (Germany) were performed at pressures from 5 to 15 kbar. Water-undersaturated experiments were carried out in the presence of 1 wt% $ H_{2} $O plus 2.44 or 0.81 wt% $ CO_{2} $ equivalent to mole fractions of $ H_{2} $O/($ H_{2} $O + $ CO_{2} $) of 0.5 and 0.75, respectively, of the volatile components added. At temperatures from 850 to 1100 °C the weight proportions of melt range from 7 to 30 %. Melt compositions change from trondhjemitic over tonalitic to dioritic with increasing degree of partial melting. Crystalline residua are plagioclase/pyroxene dominated at 5 kbar to garnet/pyroxene dominated at 15␣kbar. Dehydration melting was studied in granulite S35 similar in composition to S6. The magmatic precursors of the granulite xenoliths used in this study had geochemical characteristics of cumulate gabbro (metagabbro S37) and evolved melts (metabasalts S6, S35), respectively. Melts from granulite S37 match the major element compositions of natural trondhjemites and tonalites. At 5 kbar, their $ Al_{2} $$ O_{3} $ is relatively low, similar to tonalites from ophiolites. At 15 kbar, $ Al_{2} $$ O_{3} $ in the melts is high due to the near absence of plagioclase in the crystalline residua. The $ Al_{2} $$ O_{3} $ concentrations in 15 kbar melts from S6 (˜20 wt%) are higher than in natural tonalites. Depth constraints on the formation of tonalitic magmas in the continental crust are provided by REE (rare earth element) patterns of the synthetic melts calculated from the known REE abundances in metagabbro S37 and metabasalt S6 assuming batch melting and using partition coefficients from the literature. The REE patterns of tonalites from active continental margins and Archean trondhjemite-tonalite-granodiorite␣associations low in REE with $ La_{N} $ (chondrite normalised) from 10 to 30 and $ Yb_{N} $ from 1 to 2 are reproduced at pressures of 10 and 12.5 kbar from metagabbro S37 which displays a slightly L(light)REE enriched pattern with $ La_{N} $ = 8 and $ Yb_{N} $ = 3. Natural tonalites with $ La_{N} $ from 30 to 100 require a source richer in REE than granulite S37. At 15 kbar, H(heavy)$ REE_{N} $ in melts from granulite S37 are depressed below the level observed in natural tonalites due to the high proportion of garnet (>30 wt%) in the residue. Melts from metabasalt S6 (enriched in REE with $ La_{N} $ = 38 and $ Yb_{N} $ = 16) do not match the REE characteristics of natural tonalites under any conditions. © Springer-Verlag Berlin Heidelberg 1997
abstractGer	Abstract Partial fusion experiments with basic granulites (S6, S37) believed to represent the lower crust beneath the Eifel region (Germany) were performed at pressures from 5 to 15 kbar. Water-undersaturated experiments were carried out in the presence of 1 wt% $ H_{2} $O plus 2.44 or 0.81 wt% $ CO_{2} $ equivalent to mole fractions of $ H_{2} $O/($ H_{2} $O + $ CO_{2} $) of 0.5 and 0.75, respectively, of the volatile components added. At temperatures from 850 to 1100 °C the weight proportions of melt range from 7 to 30 %. Melt compositions change from trondhjemitic over tonalitic to dioritic with increasing degree of partial melting. Crystalline residua are plagioclase/pyroxene dominated at 5 kbar to garnet/pyroxene dominated at 15␣kbar. Dehydration melting was studied in granulite S35 similar in composition to S6. The magmatic precursors of the granulite xenoliths used in this study had geochemical characteristics of cumulate gabbro (metagabbro S37) and evolved melts (metabasalts S6, S35), respectively. Melts from granulite S37 match the major element compositions of natural trondhjemites and tonalites. At 5 kbar, their $ Al_{2} $$ O_{3} $ is relatively low, similar to tonalites from ophiolites. At 15 kbar, $ Al_{2} $$ O_{3} $ in the melts is high due to the near absence of plagioclase in the crystalline residua. The $ Al_{2} $$ O_{3} $ concentrations in 15 kbar melts from S6 (˜20 wt%) are higher than in natural tonalites. Depth constraints on the formation of tonalitic magmas in the continental crust are provided by REE (rare earth element) patterns of the synthetic melts calculated from the known REE abundances in metagabbro S37 and metabasalt S6 assuming batch melting and using partition coefficients from the literature. The REE patterns of tonalites from active continental margins and Archean trondhjemite-tonalite-granodiorite␣associations low in REE with $ La_{N} $ (chondrite normalised) from 10 to 30 and $ Yb_{N} $ from 1 to 2 are reproduced at pressures of 10 and 12.5 kbar from metagabbro S37 which displays a slightly L(light)REE enriched pattern with $ La_{N} $ = 8 and $ Yb_{N} $ = 3. Natural tonalites with $ La_{N} $ from 30 to 100 require a source richer in REE than granulite S37. At 15 kbar, H(heavy)$ REE_{N} $ in melts from granulite S37 are depressed below the level observed in natural tonalites due to the high proportion of garnet (>30 wt%) in the residue. Melts from metabasalt S6 (enriched in REE with $ La_{N} $ = 38 and $ Yb_{N} $ = 16) do not match the REE characteristics of natural tonalites under any conditions. © Springer-Verlag Berlin Heidelberg 1997
abstract_unstemmed	Abstract Partial fusion experiments with basic granulites (S6, S37) believed to represent the lower crust beneath the Eifel region (Germany) were performed at pressures from 5 to 15 kbar. Water-undersaturated experiments were carried out in the presence of 1 wt% $ H_{2} $O plus 2.44 or 0.81 wt% $ CO_{2} $ equivalent to mole fractions of $ H_{2} $O/($ H_{2} $O + $ CO_{2} $) of 0.5 and 0.75, respectively, of the volatile components added. At temperatures from 850 to 1100 °C the weight proportions of melt range from 7 to 30 %. Melt compositions change from trondhjemitic over tonalitic to dioritic with increasing degree of partial melting. Crystalline residua are plagioclase/pyroxene dominated at 5 kbar to garnet/pyroxene dominated at 15␣kbar. Dehydration melting was studied in granulite S35 similar in composition to S6. The magmatic precursors of the granulite xenoliths used in this study had geochemical characteristics of cumulate gabbro (metagabbro S37) and evolved melts (metabasalts S6, S35), respectively. Melts from granulite S37 match the major element compositions of natural trondhjemites and tonalites. At 5 kbar, their $ Al_{2} $$ O_{3} $ is relatively low, similar to tonalites from ophiolites. At 15 kbar, $ Al_{2} $$ O_{3} $ in the melts is high due to the near absence of plagioclase in the crystalline residua. The $ Al_{2} $$ O_{3} $ concentrations in 15 kbar melts from S6 (˜20 wt%) are higher than in natural tonalites. Depth constraints on the formation of tonalitic magmas in the continental crust are provided by REE (rare earth element) patterns of the synthetic melts calculated from the known REE abundances in metagabbro S37 and metabasalt S6 assuming batch melting and using partition coefficients from the literature. The REE patterns of tonalites from active continental margins and Archean trondhjemite-tonalite-granodiorite␣associations low in REE with $ La_{N} $ (chondrite normalised) from 10 to 30 and $ Yb_{N} $ from 1 to 2 are reproduced at pressures of 10 and 12.5 kbar from metagabbro S37 which displays a slightly L(light)REE enriched pattern with $ La_{N} $ = 8 and $ Yb_{N} $ = 3. Natural tonalites with $ La_{N} $ from 30 to 100 require a source richer in REE than granulite S37. At 15 kbar, H(heavy)$ REE_{N} $ in melts from granulite S37 are depressed below the level observed in natural tonalites due to the high proportion of garnet (>30 wt%) in the residue. Melts from metabasalt S6 (enriched in REE with $ La_{N} $ = 38 and $ Yb_{N} $ = 16) do not match the REE characteristics of natural tonalites under any conditions. © Springer-Verlag Berlin Heidelberg 1997
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container_issue	1-2
title_short	Partial fusion of basic granulites at 5 to 15 kbar: implications for the origin of TTG magmas
url	https://doi.org/10.1007/s004100050263
remote_bool	false
author2	Seck, Hans Adolf
author2Str	Seck, Hans Adolf
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doi_str	10.1007/s004100050263
up_date	2024-07-04T01:32:21.343Z
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