Origin and significance of spinel–pyroxene symplectite in lherzolite xenoliths from Tallante, SE Spain
Abstract We found spinel–pyroxene symplectites in lherzolite xenoliths from Tallante, SE Spain, and investigated their petrographical and geochemical signatures. The spinel–pyroxene symplectites are divided into two types, a spinel-type (= opx + cpx + sp) and a plagioclase-type (= opx + cpx + sp + p...
Ausführliche Beschreibung
Autor*in: |
Shimizu, Yohei [verfasserIn] |
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Sprache: |
Englisch |
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2008 |
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Anmerkung: |
© Springer-Verlag 2008 |
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Übergeordnetes Werk: |
Enthalten in: Mineralogy and petrology - Springer Vienna, 1987, 94(2008), 1-2 vom: 16. Apr., Seite 27-43 |
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Übergeordnetes Werk: |
volume:94 ; year:2008 ; number:1-2 ; day:16 ; month:04 ; pages:27-43 |
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DOI / URN: |
10.1007/s00710-008-0004-7 |
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Katalog-ID: |
OLC2062485867 |
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520 | |a Abstract We found spinel–pyroxene symplectites in lherzolite xenoliths from Tallante, SE Spain, and investigated their petrographical and geochemical signatures. The spinel–pyroxene symplectites are divided into two types, a spinel-type (= opx + cpx + sp) and a plagioclase-type (= opx + cpx + sp + pl) symplectites. The symplectites are always surrounded by lenticular aggregates of coarser-grained spinel–pyroxene. The petrography and major-element chemistry of bulk symplectites indicate an origin through subsolidus reaction between olivine and garnet like at Horoman (Japan; Morishita and Arai, Contrib Mineral Petrol 144:509–522, 2003). The spinel–pyroxene symplectites at Tallante were of garnet origin. However, the bulk Tallante spinel–pyroxene symplectites show a relatively flat rare earth element (REE) distribution with slight light REE (LREE) enrichment, i.e. there was no trace-element signature typical of mantle garnet. They also differ from the Horoman symplectites that occasionally preserve a garnet trace-element signature, i.e. depletion of LREE and enrichment of heavy REE. These conflicting results indicate that the symplectites record slight enrichment in pyroxene compositions during or after depletion by melt extraction and breakdown of garnet by decompression, and all the minerals including symplectite constituents have been homogenized in the stability field of spinel to plagioclase lherzolite, with the assistance of some melt (possibly an alkaline silicate melt; Downes, J Petrol 42:233–250, 2001). Moreover, some of the spinel-type symplectites experienced heating by injection of Si-rich melt, and consequently have been transformed to the plagioclase-type symplectite. The Tallante spinel–pyroxene symplectites developed from garnet + olivine and were carried from the garnet–lherzolite stability field to the spinel– and to the plagioclase–lherzolite stability fields. Our data indicates mantle upwelling (mantle diapirism) beneath the Betic–Rif zone in southern Spain. | ||
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10.1007/s00710-008-0004-7 doi (DE-627)OLC2062485867 (DE-He213)s00710-008-0004-7-p DE-627 ger DE-627 rakwb eng 550 VZ 13 ssgn TE 1000 VZ rvk Shimizu, Yohei verfasserin aut Origin and significance of spinel–pyroxene symplectite in lherzolite xenoliths from Tallante, SE Spain 2008 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag 2008 Abstract We found spinel–pyroxene symplectites in lherzolite xenoliths from Tallante, SE Spain, and investigated their petrographical and geochemical signatures. The spinel–pyroxene symplectites are divided into two types, a spinel-type (= opx + cpx + sp) and a plagioclase-type (= opx + cpx + sp + pl) symplectites. The symplectites are always surrounded by lenticular aggregates of coarser-grained spinel–pyroxene. The petrography and major-element chemistry of bulk symplectites indicate an origin through subsolidus reaction between olivine and garnet like at Horoman (Japan; Morishita and Arai, Contrib Mineral Petrol 144:509–522, 2003). The spinel–pyroxene symplectites at Tallante were of garnet origin. However, the bulk Tallante spinel–pyroxene symplectites show a relatively flat rare earth element (REE) distribution with slight light REE (LREE) enrichment, i.e. there was no trace-element signature typical of mantle garnet. They also differ from the Horoman symplectites that occasionally preserve a garnet trace-element signature, i.e. depletion of LREE and enrichment of heavy REE. These conflicting results indicate that the symplectites record slight enrichment in pyroxene compositions during or after depletion by melt extraction and breakdown of garnet by decompression, and all the minerals including symplectite constituents have been homogenized in the stability field of spinel to plagioclase lherzolite, with the assistance of some melt (possibly an alkaline silicate melt; Downes, J Petrol 42:233–250, 2001). Moreover, some of the spinel-type symplectites experienced heating by injection of Si-rich melt, and consequently have been transformed to the plagioclase-type symplectite. The Tallante spinel–pyroxene symplectites developed from garnet + olivine and were carried from the garnet–lherzolite stability field to the spinel– and to the plagioclase–lherzolite stability fields. Our data indicates mantle upwelling (mantle diapirism) beneath the Betic–Rif zone in southern Spain. Olivine Light Rare Earth Element Peridotite Xenolith Mantle Upwelling Mantle Diapirism Arai, Shoji aut Morishita, Tomoaki aut Ishida, Yoshito aut Enthalten in Mineralogy and petrology Springer Vienna, 1987 94(2008), 1-2 vom: 16. Apr., Seite 27-43 (DE-627)129383856 (DE-600)166036-6 (DE-576)014770881 0930-0708 nnns volume:94 year:2008 number:1-2 day:16 month:04 pages:27-43 https://doi.org/10.1007/s00710-008-0004-7 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_22 GBV_ILN_31 GBV_ILN_40 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_2027 GBV_ILN_2399 GBV_ILN_4306 TE 1000 AR 94 2008 1-2 16 04 27-43 |
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10.1007/s00710-008-0004-7 doi (DE-627)OLC2062485867 (DE-He213)s00710-008-0004-7-p DE-627 ger DE-627 rakwb eng 550 VZ 13 ssgn TE 1000 VZ rvk Shimizu, Yohei verfasserin aut Origin and significance of spinel–pyroxene symplectite in lherzolite xenoliths from Tallante, SE Spain 2008 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag 2008 Abstract We found spinel–pyroxene symplectites in lherzolite xenoliths from Tallante, SE Spain, and investigated their petrographical and geochemical signatures. The spinel–pyroxene symplectites are divided into two types, a spinel-type (= opx + cpx + sp) and a plagioclase-type (= opx + cpx + sp + pl) symplectites. The symplectites are always surrounded by lenticular aggregates of coarser-grained spinel–pyroxene. The petrography and major-element chemistry of bulk symplectites indicate an origin through subsolidus reaction between olivine and garnet like at Horoman (Japan; Morishita and Arai, Contrib Mineral Petrol 144:509–522, 2003). The spinel–pyroxene symplectites at Tallante were of garnet origin. However, the bulk Tallante spinel–pyroxene symplectites show a relatively flat rare earth element (REE) distribution with slight light REE (LREE) enrichment, i.e. there was no trace-element signature typical of mantle garnet. They also differ from the Horoman symplectites that occasionally preserve a garnet trace-element signature, i.e. depletion of LREE and enrichment of heavy REE. These conflicting results indicate that the symplectites record slight enrichment in pyroxene compositions during or after depletion by melt extraction and breakdown of garnet by decompression, and all the minerals including symplectite constituents have been homogenized in the stability field of spinel to plagioclase lherzolite, with the assistance of some melt (possibly an alkaline silicate melt; Downes, J Petrol 42:233–250, 2001). Moreover, some of the spinel-type symplectites experienced heating by injection of Si-rich melt, and consequently have been transformed to the plagioclase-type symplectite. The Tallante spinel–pyroxene symplectites developed from garnet + olivine and were carried from the garnet–lherzolite stability field to the spinel– and to the plagioclase–lherzolite stability fields. Our data indicates mantle upwelling (mantle diapirism) beneath the Betic–Rif zone in southern Spain. Olivine Light Rare Earth Element Peridotite Xenolith Mantle Upwelling Mantle Diapirism Arai, Shoji aut Morishita, Tomoaki aut Ishida, Yoshito aut Enthalten in Mineralogy and petrology Springer Vienna, 1987 94(2008), 1-2 vom: 16. Apr., Seite 27-43 (DE-627)129383856 (DE-600)166036-6 (DE-576)014770881 0930-0708 nnns volume:94 year:2008 number:1-2 day:16 month:04 pages:27-43 https://doi.org/10.1007/s00710-008-0004-7 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_22 GBV_ILN_31 GBV_ILN_40 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_2027 GBV_ILN_2399 GBV_ILN_4306 TE 1000 AR 94 2008 1-2 16 04 27-43 |
allfields_unstemmed |
10.1007/s00710-008-0004-7 doi (DE-627)OLC2062485867 (DE-He213)s00710-008-0004-7-p DE-627 ger DE-627 rakwb eng 550 VZ 13 ssgn TE 1000 VZ rvk Shimizu, Yohei verfasserin aut Origin and significance of spinel–pyroxene symplectite in lherzolite xenoliths from Tallante, SE Spain 2008 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag 2008 Abstract We found spinel–pyroxene symplectites in lherzolite xenoliths from Tallante, SE Spain, and investigated their petrographical and geochemical signatures. The spinel–pyroxene symplectites are divided into two types, a spinel-type (= opx + cpx + sp) and a plagioclase-type (= opx + cpx + sp + pl) symplectites. The symplectites are always surrounded by lenticular aggregates of coarser-grained spinel–pyroxene. The petrography and major-element chemistry of bulk symplectites indicate an origin through subsolidus reaction between olivine and garnet like at Horoman (Japan; Morishita and Arai, Contrib Mineral Petrol 144:509–522, 2003). The spinel–pyroxene symplectites at Tallante were of garnet origin. However, the bulk Tallante spinel–pyroxene symplectites show a relatively flat rare earth element (REE) distribution with slight light REE (LREE) enrichment, i.e. there was no trace-element signature typical of mantle garnet. They also differ from the Horoman symplectites that occasionally preserve a garnet trace-element signature, i.e. depletion of LREE and enrichment of heavy REE. These conflicting results indicate that the symplectites record slight enrichment in pyroxene compositions during or after depletion by melt extraction and breakdown of garnet by decompression, and all the minerals including symplectite constituents have been homogenized in the stability field of spinel to plagioclase lherzolite, with the assistance of some melt (possibly an alkaline silicate melt; Downes, J Petrol 42:233–250, 2001). Moreover, some of the spinel-type symplectites experienced heating by injection of Si-rich melt, and consequently have been transformed to the plagioclase-type symplectite. The Tallante spinel–pyroxene symplectites developed from garnet + olivine and were carried from the garnet–lherzolite stability field to the spinel– and to the plagioclase–lherzolite stability fields. Our data indicates mantle upwelling (mantle diapirism) beneath the Betic–Rif zone in southern Spain. Olivine Light Rare Earth Element Peridotite Xenolith Mantle Upwelling Mantle Diapirism Arai, Shoji aut Morishita, Tomoaki aut Ishida, Yoshito aut Enthalten in Mineralogy and petrology Springer Vienna, 1987 94(2008), 1-2 vom: 16. Apr., Seite 27-43 (DE-627)129383856 (DE-600)166036-6 (DE-576)014770881 0930-0708 nnns volume:94 year:2008 number:1-2 day:16 month:04 pages:27-43 https://doi.org/10.1007/s00710-008-0004-7 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_22 GBV_ILN_31 GBV_ILN_40 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_2027 GBV_ILN_2399 GBV_ILN_4306 TE 1000 AR 94 2008 1-2 16 04 27-43 |
allfieldsGer |
10.1007/s00710-008-0004-7 doi (DE-627)OLC2062485867 (DE-He213)s00710-008-0004-7-p DE-627 ger DE-627 rakwb eng 550 VZ 13 ssgn TE 1000 VZ rvk Shimizu, Yohei verfasserin aut Origin and significance of spinel–pyroxene symplectite in lherzolite xenoliths from Tallante, SE Spain 2008 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag 2008 Abstract We found spinel–pyroxene symplectites in lherzolite xenoliths from Tallante, SE Spain, and investigated their petrographical and geochemical signatures. The spinel–pyroxene symplectites are divided into two types, a spinel-type (= opx + cpx + sp) and a plagioclase-type (= opx + cpx + sp + pl) symplectites. The symplectites are always surrounded by lenticular aggregates of coarser-grained spinel–pyroxene. The petrography and major-element chemistry of bulk symplectites indicate an origin through subsolidus reaction between olivine and garnet like at Horoman (Japan; Morishita and Arai, Contrib Mineral Petrol 144:509–522, 2003). The spinel–pyroxene symplectites at Tallante were of garnet origin. However, the bulk Tallante spinel–pyroxene symplectites show a relatively flat rare earth element (REE) distribution with slight light REE (LREE) enrichment, i.e. there was no trace-element signature typical of mantle garnet. They also differ from the Horoman symplectites that occasionally preserve a garnet trace-element signature, i.e. depletion of LREE and enrichment of heavy REE. These conflicting results indicate that the symplectites record slight enrichment in pyroxene compositions during or after depletion by melt extraction and breakdown of garnet by decompression, and all the minerals including symplectite constituents have been homogenized in the stability field of spinel to plagioclase lherzolite, with the assistance of some melt (possibly an alkaline silicate melt; Downes, J Petrol 42:233–250, 2001). Moreover, some of the spinel-type symplectites experienced heating by injection of Si-rich melt, and consequently have been transformed to the plagioclase-type symplectite. The Tallante spinel–pyroxene symplectites developed from garnet + olivine and were carried from the garnet–lherzolite stability field to the spinel– and to the plagioclase–lherzolite stability fields. Our data indicates mantle upwelling (mantle diapirism) beneath the Betic–Rif zone in southern Spain. Olivine Light Rare Earth Element Peridotite Xenolith Mantle Upwelling Mantle Diapirism Arai, Shoji aut Morishita, Tomoaki aut Ishida, Yoshito aut Enthalten in Mineralogy and petrology Springer Vienna, 1987 94(2008), 1-2 vom: 16. Apr., Seite 27-43 (DE-627)129383856 (DE-600)166036-6 (DE-576)014770881 0930-0708 nnns volume:94 year:2008 number:1-2 day:16 month:04 pages:27-43 https://doi.org/10.1007/s00710-008-0004-7 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_22 GBV_ILN_31 GBV_ILN_40 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_2027 GBV_ILN_2399 GBV_ILN_4306 TE 1000 AR 94 2008 1-2 16 04 27-43 |
allfieldsSound |
10.1007/s00710-008-0004-7 doi (DE-627)OLC2062485867 (DE-He213)s00710-008-0004-7-p DE-627 ger DE-627 rakwb eng 550 VZ 13 ssgn TE 1000 VZ rvk Shimizu, Yohei verfasserin aut Origin and significance of spinel–pyroxene symplectite in lherzolite xenoliths from Tallante, SE Spain 2008 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag 2008 Abstract We found spinel–pyroxene symplectites in lherzolite xenoliths from Tallante, SE Spain, and investigated their petrographical and geochemical signatures. The spinel–pyroxene symplectites are divided into two types, a spinel-type (= opx + cpx + sp) and a plagioclase-type (= opx + cpx + sp + pl) symplectites. The symplectites are always surrounded by lenticular aggregates of coarser-grained spinel–pyroxene. The petrography and major-element chemistry of bulk symplectites indicate an origin through subsolidus reaction between olivine and garnet like at Horoman (Japan; Morishita and Arai, Contrib Mineral Petrol 144:509–522, 2003). The spinel–pyroxene symplectites at Tallante were of garnet origin. However, the bulk Tallante spinel–pyroxene symplectites show a relatively flat rare earth element (REE) distribution with slight light REE (LREE) enrichment, i.e. there was no trace-element signature typical of mantle garnet. They also differ from the Horoman symplectites that occasionally preserve a garnet trace-element signature, i.e. depletion of LREE and enrichment of heavy REE. These conflicting results indicate that the symplectites record slight enrichment in pyroxene compositions during or after depletion by melt extraction and breakdown of garnet by decompression, and all the minerals including symplectite constituents have been homogenized in the stability field of spinel to plagioclase lherzolite, with the assistance of some melt (possibly an alkaline silicate melt; Downes, J Petrol 42:233–250, 2001). Moreover, some of the spinel-type symplectites experienced heating by injection of Si-rich melt, and consequently have been transformed to the plagioclase-type symplectite. The Tallante spinel–pyroxene symplectites developed from garnet + olivine and were carried from the garnet–lherzolite stability field to the spinel– and to the plagioclase–lherzolite stability fields. Our data indicates mantle upwelling (mantle diapirism) beneath the Betic–Rif zone in southern Spain. Olivine Light Rare Earth Element Peridotite Xenolith Mantle Upwelling Mantle Diapirism Arai, Shoji aut Morishita, Tomoaki aut Ishida, Yoshito aut Enthalten in Mineralogy and petrology Springer Vienna, 1987 94(2008), 1-2 vom: 16. Apr., Seite 27-43 (DE-627)129383856 (DE-600)166036-6 (DE-576)014770881 0930-0708 nnns volume:94 year:2008 number:1-2 day:16 month:04 pages:27-43 https://doi.org/10.1007/s00710-008-0004-7 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_22 GBV_ILN_31 GBV_ILN_40 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_2027 GBV_ILN_2399 GBV_ILN_4306 TE 1000 AR 94 2008 1-2 16 04 27-43 |
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550 VZ 13 ssgn TE 1000 VZ rvk Origin and significance of spinel–pyroxene symplectite in lherzolite xenoliths from Tallante, SE Spain Olivine Light Rare Earth Element Peridotite Xenolith Mantle Upwelling Mantle Diapirism |
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Origin and significance of spinel–pyroxene symplectite in lherzolite xenoliths from Tallante, SE Spain |
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Origin and significance of spinel–pyroxene symplectite in lherzolite xenoliths from Tallante, SE Spain |
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origin and significance of spinel–pyroxene symplectite in lherzolite xenoliths from tallante, se spain |
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Origin and significance of spinel–pyroxene symplectite in lherzolite xenoliths from Tallante, SE Spain |
abstract |
Abstract We found spinel–pyroxene symplectites in lherzolite xenoliths from Tallante, SE Spain, and investigated their petrographical and geochemical signatures. The spinel–pyroxene symplectites are divided into two types, a spinel-type (= opx + cpx + sp) and a plagioclase-type (= opx + cpx + sp + pl) symplectites. The symplectites are always surrounded by lenticular aggregates of coarser-grained spinel–pyroxene. The petrography and major-element chemistry of bulk symplectites indicate an origin through subsolidus reaction between olivine and garnet like at Horoman (Japan; Morishita and Arai, Contrib Mineral Petrol 144:509–522, 2003). The spinel–pyroxene symplectites at Tallante were of garnet origin. However, the bulk Tallante spinel–pyroxene symplectites show a relatively flat rare earth element (REE) distribution with slight light REE (LREE) enrichment, i.e. there was no trace-element signature typical of mantle garnet. They also differ from the Horoman symplectites that occasionally preserve a garnet trace-element signature, i.e. depletion of LREE and enrichment of heavy REE. These conflicting results indicate that the symplectites record slight enrichment in pyroxene compositions during or after depletion by melt extraction and breakdown of garnet by decompression, and all the minerals including symplectite constituents have been homogenized in the stability field of spinel to plagioclase lherzolite, with the assistance of some melt (possibly an alkaline silicate melt; Downes, J Petrol 42:233–250, 2001). Moreover, some of the spinel-type symplectites experienced heating by injection of Si-rich melt, and consequently have been transformed to the plagioclase-type symplectite. The Tallante spinel–pyroxene symplectites developed from garnet + olivine and were carried from the garnet–lherzolite stability field to the spinel– and to the plagioclase–lherzolite stability fields. Our data indicates mantle upwelling (mantle diapirism) beneath the Betic–Rif zone in southern Spain. © Springer-Verlag 2008 |
abstractGer |
Abstract We found spinel–pyroxene symplectites in lherzolite xenoliths from Tallante, SE Spain, and investigated their petrographical and geochemical signatures. The spinel–pyroxene symplectites are divided into two types, a spinel-type (= opx + cpx + sp) and a plagioclase-type (= opx + cpx + sp + pl) symplectites. The symplectites are always surrounded by lenticular aggregates of coarser-grained spinel–pyroxene. The petrography and major-element chemistry of bulk symplectites indicate an origin through subsolidus reaction between olivine and garnet like at Horoman (Japan; Morishita and Arai, Contrib Mineral Petrol 144:509–522, 2003). The spinel–pyroxene symplectites at Tallante were of garnet origin. However, the bulk Tallante spinel–pyroxene symplectites show a relatively flat rare earth element (REE) distribution with slight light REE (LREE) enrichment, i.e. there was no trace-element signature typical of mantle garnet. They also differ from the Horoman symplectites that occasionally preserve a garnet trace-element signature, i.e. depletion of LREE and enrichment of heavy REE. These conflicting results indicate that the symplectites record slight enrichment in pyroxene compositions during or after depletion by melt extraction and breakdown of garnet by decompression, and all the minerals including symplectite constituents have been homogenized in the stability field of spinel to plagioclase lherzolite, with the assistance of some melt (possibly an alkaline silicate melt; Downes, J Petrol 42:233–250, 2001). Moreover, some of the spinel-type symplectites experienced heating by injection of Si-rich melt, and consequently have been transformed to the plagioclase-type symplectite. The Tallante spinel–pyroxene symplectites developed from garnet + olivine and were carried from the garnet–lherzolite stability field to the spinel– and to the plagioclase–lherzolite stability fields. Our data indicates mantle upwelling (mantle diapirism) beneath the Betic–Rif zone in southern Spain. © Springer-Verlag 2008 |
abstract_unstemmed |
Abstract We found spinel–pyroxene symplectites in lherzolite xenoliths from Tallante, SE Spain, and investigated their petrographical and geochemical signatures. The spinel–pyroxene symplectites are divided into two types, a spinel-type (= opx + cpx + sp) and a plagioclase-type (= opx + cpx + sp + pl) symplectites. The symplectites are always surrounded by lenticular aggregates of coarser-grained spinel–pyroxene. The petrography and major-element chemistry of bulk symplectites indicate an origin through subsolidus reaction between olivine and garnet like at Horoman (Japan; Morishita and Arai, Contrib Mineral Petrol 144:509–522, 2003). The spinel–pyroxene symplectites at Tallante were of garnet origin. However, the bulk Tallante spinel–pyroxene symplectites show a relatively flat rare earth element (REE) distribution with slight light REE (LREE) enrichment, i.e. there was no trace-element signature typical of mantle garnet. They also differ from the Horoman symplectites that occasionally preserve a garnet trace-element signature, i.e. depletion of LREE and enrichment of heavy REE. These conflicting results indicate that the symplectites record slight enrichment in pyroxene compositions during or after depletion by melt extraction and breakdown of garnet by decompression, and all the minerals including symplectite constituents have been homogenized in the stability field of spinel to plagioclase lherzolite, with the assistance of some melt (possibly an alkaline silicate melt; Downes, J Petrol 42:233–250, 2001). Moreover, some of the spinel-type symplectites experienced heating by injection of Si-rich melt, and consequently have been transformed to the plagioclase-type symplectite. The Tallante spinel–pyroxene symplectites developed from garnet + olivine and were carried from the garnet–lherzolite stability field to the spinel– and to the plagioclase–lherzolite stability fields. Our data indicates mantle upwelling (mantle diapirism) beneath the Betic–Rif zone in southern Spain. © Springer-Verlag 2008 |
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Origin and significance of spinel–pyroxene symplectite in lherzolite xenoliths from Tallante, SE Spain |
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These conflicting results indicate that the symplectites record slight enrichment in pyroxene compositions during or after depletion by melt extraction and breakdown of garnet by decompression, and all the minerals including symplectite constituents have been homogenized in the stability field of spinel to plagioclase lherzolite, with the assistance of some melt (possibly an alkaline silicate melt; Downes, J Petrol 42:233–250, 2001). Moreover, some of the spinel-type symplectites experienced heating by injection of Si-rich melt, and consequently have been transformed to the plagioclase-type symplectite. The Tallante spinel–pyroxene symplectites developed from garnet + olivine and were carried from the garnet–lherzolite stability field to the spinel– and to the plagioclase–lherzolite stability fields. 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