DISCOVERY OF FERROPICRITES AND HIGH-MAGNESIAN ANDESITES FROM THE ERDENETSOGT FORMATION, CENTRAL MONGOLIA

<p<New geochemical and petrological results are presented for greenstones from the Erdenetsogt Formation hosted by the Tsetserleg accretionary terrane in the Hangay region, with particular emphasis on newly found picritic and andesitic rocks. These rocks occur mostly in the lower portion of th...
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Autor*in:	Ganbat Erdenesaikhan [verfasserIn] Akira Ishiwatari [verfasserIn] Demberel Orolmaa [verfasserIn] Shoji Arai [verfasserIn] Akihiro Tamura [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch ; Russisch

Erschienen:	2016

Schlagwörter:	Uyanga area in Hangay-Hentey belt, Erdenetsogt Formation in Tsetserleg terrane, oceanic plateau, ferropicrite and ferrobasalt, high-Mg andesite (HMA)

Übergeordnetes Werk:	In: Proceedings of the Mongolian Academy of Sciences - Mongolian Academy of Sciences, 2018, 54(2016), 4, Seite 52-63
Übergeordnetes Werk:	volume:54 ; year:2016 ; number:4 ; pages:52-63

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc Journal toc

DOI / URN:	10.5564/pmas.v54i4.625

Katalog-ID:	DOAJ043911226

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allfields	10.5564/pmas.v54i4.625 doi (DE-627)DOAJ043911226 (DE-599)DOAJ289ef686fcc443e79f7dde7d6b30c860 DE-627 ger DE-627 rakwb eng rus Ganbat Erdenesaikhan verfasserin aut DISCOVERY OF FERROPICRITES AND HIGH-MAGNESIAN ANDESITES FROM THE ERDENETSOGT FORMATION, CENTRAL MONGOLIA 2016 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier <p<New geochemical and petrological results are presented for greenstones from the Erdenetsogt Formation hosted by the Tsetserleg accretionary terrane in the Hangay region, with particular emphasis on newly found picritic and andesitic rocks. These rocks occur mostly in the lower portion of the Erdenetsogt Formation as massive lavas, sills, and dykes closely associated with varicolored bedded ribbon cherts and siltstones. The protoliths of the studied greenstones comprise (1) plume-derived tholeiitic greenstones with oceanic plateau basalt affinity, (2) arc-derived, calc-alkaline andesites. The plume-derived rocks are characterized by chemical signatures such as slight LREE enrichment similar to that of tholeiitic OIB and the existence of ferropicrite with high FeO* (>14 wt%) and MgO (12–22 wt%), which is characteristic of large igneous provinces (LIPs), including oceanic plateaus. Therefore, their tholeiitic composition and high-Fe and -Ti contents require melting of the source mantle peridotite with addition of some recycled Fe- and Ti-rich basaltic material. The andesites are characterized by glassy texture, high MgO content (up to 7 wt%), and significant LREE enrichment with depletion in Nb and resemble sanukite type of high-magnesian andesite (HMAs). We infer that the Hangay tholeiitic greenstones probably represent an accreted upper section of an oceanic plateau that developed in the deep-water region of the Hangay-Henteypaleo-ocean in the Upper Silurian-Lower Devonian. The Hangay HMAs may have been produced by subduction of young oceanic plate after an oceanward back-stepping of the subduction zone that was a result of the collision during the Carboniferous of the oceanic plateau and the active continental margin of the Central Mongolian Massif.</p< Uyanga area in Hangay-Hentey belt, Erdenetsogt Formation in Tsetserleg terrane, oceanic plateau, ferropicrite and ferrobasalt, high-Mg andesite (HMA) Science Q Social Sciences H Akira Ishiwatari verfasserin aut Demberel Orolmaa verfasserin aut Shoji Arai verfasserin aut Akihiro Tamura verfasserin aut In Proceedings of the Mongolian Academy of Sciences Mongolian Academy of Sciences, 2018 54(2016), 4, Seite 52-63 (DE-627)898627389 (DE-600)2907056-9 23122994 nnns volume:54 year:2016 number:4 pages:52-63 https://doi.org/10.5564/pmas.v54i4.625 kostenfrei https://doaj.org/article/289ef686fcc443e79f7dde7d6b30c860 kostenfrei https://www.mongoliajol.info/index.php/PMAS/article/view/625 kostenfrei https://doaj.org/toc/2310-4716 Journal toc kostenfrei https://doaj.org/toc/2312-2994 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_171 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4392 GBV_ILN_4700 AR 54 2016 4 52-63
spelling	10.5564/pmas.v54i4.625 doi (DE-627)DOAJ043911226 (DE-599)DOAJ289ef686fcc443e79f7dde7d6b30c860 DE-627 ger DE-627 rakwb eng rus Ganbat Erdenesaikhan verfasserin aut DISCOVERY OF FERROPICRITES AND HIGH-MAGNESIAN ANDESITES FROM THE ERDENETSOGT FORMATION, CENTRAL MONGOLIA 2016 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier <p<New geochemical and petrological results are presented for greenstones from the Erdenetsogt Formation hosted by the Tsetserleg accretionary terrane in the Hangay region, with particular emphasis on newly found picritic and andesitic rocks. These rocks occur mostly in the lower portion of the Erdenetsogt Formation as massive lavas, sills, and dykes closely associated with varicolored bedded ribbon cherts and siltstones. The protoliths of the studied greenstones comprise (1) plume-derived tholeiitic greenstones with oceanic plateau basalt affinity, (2) arc-derived, calc-alkaline andesites. The plume-derived rocks are characterized by chemical signatures such as slight LREE enrichment similar to that of tholeiitic OIB and the existence of ferropicrite with high FeO* (>14 wt%) and MgO (12–22 wt%), which is characteristic of large igneous provinces (LIPs), including oceanic plateaus. Therefore, their tholeiitic composition and high-Fe and -Ti contents require melting of the source mantle peridotite with addition of some recycled Fe- and Ti-rich basaltic material. The andesites are characterized by glassy texture, high MgO content (up to 7 wt%), and significant LREE enrichment with depletion in Nb and resemble sanukite type of high-magnesian andesite (HMAs). We infer that the Hangay tholeiitic greenstones probably represent an accreted upper section of an oceanic plateau that developed in the deep-water region of the Hangay-Henteypaleo-ocean in the Upper Silurian-Lower Devonian. The Hangay HMAs may have been produced by subduction of young oceanic plate after an oceanward back-stepping of the subduction zone that was a result of the collision during the Carboniferous of the oceanic plateau and the active continental margin of the Central Mongolian Massif.</p< Uyanga area in Hangay-Hentey belt, Erdenetsogt Formation in Tsetserleg terrane, oceanic plateau, ferropicrite and ferrobasalt, high-Mg andesite (HMA) Science Q Social Sciences H Akira Ishiwatari verfasserin aut Demberel Orolmaa verfasserin aut Shoji Arai verfasserin aut Akihiro Tamura verfasserin aut In Proceedings of the Mongolian Academy of Sciences Mongolian Academy of Sciences, 2018 54(2016), 4, Seite 52-63 (DE-627)898627389 (DE-600)2907056-9 23122994 nnns volume:54 year:2016 number:4 pages:52-63 https://doi.org/10.5564/pmas.v54i4.625 kostenfrei https://doaj.org/article/289ef686fcc443e79f7dde7d6b30c860 kostenfrei https://www.mongoliajol.info/index.php/PMAS/article/view/625 kostenfrei https://doaj.org/toc/2310-4716 Journal toc kostenfrei https://doaj.org/toc/2312-2994 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_171 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4392 GBV_ILN_4700 AR 54 2016 4 52-63
allfields_unstemmed	10.5564/pmas.v54i4.625 doi (DE-627)DOAJ043911226 (DE-599)DOAJ289ef686fcc443e79f7dde7d6b30c860 DE-627 ger DE-627 rakwb eng rus Ganbat Erdenesaikhan verfasserin aut DISCOVERY OF FERROPICRITES AND HIGH-MAGNESIAN ANDESITES FROM THE ERDENETSOGT FORMATION, CENTRAL MONGOLIA 2016 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier <p<New geochemical and petrological results are presented for greenstones from the Erdenetsogt Formation hosted by the Tsetserleg accretionary terrane in the Hangay region, with particular emphasis on newly found picritic and andesitic rocks. These rocks occur mostly in the lower portion of the Erdenetsogt Formation as massive lavas, sills, and dykes closely associated with varicolored bedded ribbon cherts and siltstones. The protoliths of the studied greenstones comprise (1) plume-derived tholeiitic greenstones with oceanic plateau basalt affinity, (2) arc-derived, calc-alkaline andesites. The plume-derived rocks are characterized by chemical signatures such as slight LREE enrichment similar to that of tholeiitic OIB and the existence of ferropicrite with high FeO* (>14 wt%) and MgO (12–22 wt%), which is characteristic of large igneous provinces (LIPs), including oceanic plateaus. Therefore, their tholeiitic composition and high-Fe and -Ti contents require melting of the source mantle peridotite with addition of some recycled Fe- and Ti-rich basaltic material. The andesites are characterized by glassy texture, high MgO content (up to 7 wt%), and significant LREE enrichment with depletion in Nb and resemble sanukite type of high-magnesian andesite (HMAs). We infer that the Hangay tholeiitic greenstones probably represent an accreted upper section of an oceanic plateau that developed in the deep-water region of the Hangay-Henteypaleo-ocean in the Upper Silurian-Lower Devonian. The Hangay HMAs may have been produced by subduction of young oceanic plate after an oceanward back-stepping of the subduction zone that was a result of the collision during the Carboniferous of the oceanic plateau and the active continental margin of the Central Mongolian Massif.</p< Uyanga area in Hangay-Hentey belt, Erdenetsogt Formation in Tsetserleg terrane, oceanic plateau, ferropicrite and ferrobasalt, high-Mg andesite (HMA) Science Q Social Sciences H Akira Ishiwatari verfasserin aut Demberel Orolmaa verfasserin aut Shoji Arai verfasserin aut Akihiro Tamura verfasserin aut In Proceedings of the Mongolian Academy of Sciences Mongolian Academy of Sciences, 2018 54(2016), 4, Seite 52-63 (DE-627)898627389 (DE-600)2907056-9 23122994 nnns volume:54 year:2016 number:4 pages:52-63 https://doi.org/10.5564/pmas.v54i4.625 kostenfrei https://doaj.org/article/289ef686fcc443e79f7dde7d6b30c860 kostenfrei https://www.mongoliajol.info/index.php/PMAS/article/view/625 kostenfrei https://doaj.org/toc/2310-4716 Journal toc kostenfrei https://doaj.org/toc/2312-2994 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_171 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4392 GBV_ILN_4700 AR 54 2016 4 52-63
allfieldsGer	10.5564/pmas.v54i4.625 doi (DE-627)DOAJ043911226 (DE-599)DOAJ289ef686fcc443e79f7dde7d6b30c860 DE-627 ger DE-627 rakwb eng rus Ganbat Erdenesaikhan verfasserin aut DISCOVERY OF FERROPICRITES AND HIGH-MAGNESIAN ANDESITES FROM THE ERDENETSOGT FORMATION, CENTRAL MONGOLIA 2016 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier <p<New geochemical and petrological results are presented for greenstones from the Erdenetsogt Formation hosted by the Tsetserleg accretionary terrane in the Hangay region, with particular emphasis on newly found picritic and andesitic rocks. These rocks occur mostly in the lower portion of the Erdenetsogt Formation as massive lavas, sills, and dykes closely associated with varicolored bedded ribbon cherts and siltstones. The protoliths of the studied greenstones comprise (1) plume-derived tholeiitic greenstones with oceanic plateau basalt affinity, (2) arc-derived, calc-alkaline andesites. The plume-derived rocks are characterized by chemical signatures such as slight LREE enrichment similar to that of tholeiitic OIB and the existence of ferropicrite with high FeO* (>14 wt%) and MgO (12–22 wt%), which is characteristic of large igneous provinces (LIPs), including oceanic plateaus. Therefore, their tholeiitic composition and high-Fe and -Ti contents require melting of the source mantle peridotite with addition of some recycled Fe- and Ti-rich basaltic material. The andesites are characterized by glassy texture, high MgO content (up to 7 wt%), and significant LREE enrichment with depletion in Nb and resemble sanukite type of high-magnesian andesite (HMAs). We infer that the Hangay tholeiitic greenstones probably represent an accreted upper section of an oceanic plateau that developed in the deep-water region of the Hangay-Henteypaleo-ocean in the Upper Silurian-Lower Devonian. The Hangay HMAs may have been produced by subduction of young oceanic plate after an oceanward back-stepping of the subduction zone that was a result of the collision during the Carboniferous of the oceanic plateau and the active continental margin of the Central Mongolian Massif.</p< Uyanga area in Hangay-Hentey belt, Erdenetsogt Formation in Tsetserleg terrane, oceanic plateau, ferropicrite and ferrobasalt, high-Mg andesite (HMA) Science Q Social Sciences H Akira Ishiwatari verfasserin aut Demberel Orolmaa verfasserin aut Shoji Arai verfasserin aut Akihiro Tamura verfasserin aut In Proceedings of the Mongolian Academy of Sciences Mongolian Academy of Sciences, 2018 54(2016), 4, Seite 52-63 (DE-627)898627389 (DE-600)2907056-9 23122994 nnns volume:54 year:2016 number:4 pages:52-63 https://doi.org/10.5564/pmas.v54i4.625 kostenfrei https://doaj.org/article/289ef686fcc443e79f7dde7d6b30c860 kostenfrei https://www.mongoliajol.info/index.php/PMAS/article/view/625 kostenfrei https://doaj.org/toc/2310-4716 Journal toc kostenfrei https://doaj.org/toc/2312-2994 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_171 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4392 GBV_ILN_4700 AR 54 2016 4 52-63
allfieldsSound	10.5564/pmas.v54i4.625 doi (DE-627)DOAJ043911226 (DE-599)DOAJ289ef686fcc443e79f7dde7d6b30c860 DE-627 ger DE-627 rakwb eng rus Ganbat Erdenesaikhan verfasserin aut DISCOVERY OF FERROPICRITES AND HIGH-MAGNESIAN ANDESITES FROM THE ERDENETSOGT FORMATION, CENTRAL MONGOLIA 2016 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier <p<New geochemical and petrological results are presented for greenstones from the Erdenetsogt Formation hosted by the Tsetserleg accretionary terrane in the Hangay region, with particular emphasis on newly found picritic and andesitic rocks. These rocks occur mostly in the lower portion of the Erdenetsogt Formation as massive lavas, sills, and dykes closely associated with varicolored bedded ribbon cherts and siltstones. The protoliths of the studied greenstones comprise (1) plume-derived tholeiitic greenstones with oceanic plateau basalt affinity, (2) arc-derived, calc-alkaline andesites. The plume-derived rocks are characterized by chemical signatures such as slight LREE enrichment similar to that of tholeiitic OIB and the existence of ferropicrite with high FeO* (>14 wt%) and MgO (12–22 wt%), which is characteristic of large igneous provinces (LIPs), including oceanic plateaus. Therefore, their tholeiitic composition and high-Fe and -Ti contents require melting of the source mantle peridotite with addition of some recycled Fe- and Ti-rich basaltic material. The andesites are characterized by glassy texture, high MgO content (up to 7 wt%), and significant LREE enrichment with depletion in Nb and resemble sanukite type of high-magnesian andesite (HMAs). We infer that the Hangay tholeiitic greenstones probably represent an accreted upper section of an oceanic plateau that developed in the deep-water region of the Hangay-Henteypaleo-ocean in the Upper Silurian-Lower Devonian. The Hangay HMAs may have been produced by subduction of young oceanic plate after an oceanward back-stepping of the subduction zone that was a result of the collision during the Carboniferous of the oceanic plateau and the active continental margin of the Central Mongolian Massif.</p< Uyanga area in Hangay-Hentey belt, Erdenetsogt Formation in Tsetserleg terrane, oceanic plateau, ferropicrite and ferrobasalt, high-Mg andesite (HMA) Science Q Social Sciences H Akira Ishiwatari verfasserin aut Demberel Orolmaa verfasserin aut Shoji Arai verfasserin aut Akihiro Tamura verfasserin aut In Proceedings of the Mongolian Academy of Sciences Mongolian Academy of Sciences, 2018 54(2016), 4, Seite 52-63 (DE-627)898627389 (DE-600)2907056-9 23122994 nnns volume:54 year:2016 number:4 pages:52-63 https://doi.org/10.5564/pmas.v54i4.625 kostenfrei https://doaj.org/article/289ef686fcc443e79f7dde7d6b30c860 kostenfrei https://www.mongoliajol.info/index.php/PMAS/article/view/625 kostenfrei https://doaj.org/toc/2310-4716 Journal toc kostenfrei https://doaj.org/toc/2312-2994 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_171 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4392 GBV_ILN_4700 AR 54 2016 4 52-63
language	English Russian
source	In Proceedings of the Mongolian Academy of Sciences 54(2016), 4, Seite 52-63 volume:54 year:2016 number:4 pages:52-63
sourceStr	In Proceedings of the Mongolian Academy of Sciences 54(2016), 4, Seite 52-63 volume:54 year:2016 number:4 pages:52-63
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institution	findex.gbv.de
topic_facet	Uyanga area in Hangay-Hentey belt, Erdenetsogt Formation in Tsetserleg terrane, oceanic plateau, ferropicrite and ferrobasalt, high-Mg andesite (HMA) Science Q Social Sciences H
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container_title	Proceedings of the Mongolian Academy of Sciences
authorswithroles_txt_mv	Ganbat Erdenesaikhan @@aut@@ Akira Ishiwatari @@aut@@ Demberel Orolmaa @@aut@@ Shoji Arai @@aut@@ Akihiro Tamura @@aut@@
publishDateDaySort_date	2016-01-01T00:00:00Z
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language_de	englisch russisch
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author	Ganbat Erdenesaikhan
spellingShingle	Ganbat Erdenesaikhan misc Uyanga area in Hangay-Hentey belt, Erdenetsogt Formation in Tsetserleg terrane, oceanic plateau, ferropicrite and ferrobasalt, high-Mg andesite (HMA) misc Science misc Q misc Social Sciences misc H DISCOVERY OF FERROPICRITES AND HIGH-MAGNESIAN ANDESITES FROM THE ERDENETSOGT FORMATION, CENTRAL MONGOLIA
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topic_title	DISCOVERY OF FERROPICRITES AND HIGH-MAGNESIAN ANDESITES FROM THE ERDENETSOGT FORMATION, CENTRAL MONGOLIA Uyanga area in Hangay-Hentey belt, Erdenetsogt Formation in Tsetserleg terrane, oceanic plateau, ferropicrite and ferrobasalt, high-Mg andesite (HMA)
topic	misc Uyanga area in Hangay-Hentey belt, Erdenetsogt Formation in Tsetserleg terrane, oceanic plateau, ferropicrite and ferrobasalt, high-Mg andesite (HMA) misc Science misc Q misc Social Sciences misc H
topic_unstemmed	misc Uyanga area in Hangay-Hentey belt, Erdenetsogt Formation in Tsetserleg terrane, oceanic plateau, ferropicrite and ferrobasalt, high-Mg andesite (HMA) misc Science misc Q misc Social Sciences misc H
topic_browse	misc Uyanga area in Hangay-Hentey belt, Erdenetsogt Formation in Tsetserleg terrane, oceanic plateau, ferropicrite and ferrobasalt, high-Mg andesite (HMA) misc Science misc Q misc Social Sciences misc H
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hierarchy_parent_title	Proceedings of the Mongolian Academy of Sciences
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title	DISCOVERY OF FERROPICRITES AND HIGH-MAGNESIAN ANDESITES FROM THE ERDENETSOGT FORMATION, CENTRAL MONGOLIA
ctrlnum	(DE-627)DOAJ043911226 (DE-599)DOAJ289ef686fcc443e79f7dde7d6b30c860
title_full	DISCOVERY OF FERROPICRITES AND HIGH-MAGNESIAN ANDESITES FROM THE ERDENETSOGT FORMATION, CENTRAL MONGOLIA
author_sort	Ganbat Erdenesaikhan
journal	Proceedings of the Mongolian Academy of Sciences
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author_browse	Ganbat Erdenesaikhan Akira Ishiwatari Demberel Orolmaa Shoji Arai Akihiro Tamura
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author-letter	Ganbat Erdenesaikhan
doi_str_mv	10.5564/pmas.v54i4.625
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title_sort	discovery of ferropicrites and high-magnesian andesites from the erdenetsogt formation, central mongolia
title_auth	DISCOVERY OF FERROPICRITES AND HIGH-MAGNESIAN ANDESITES FROM THE ERDENETSOGT FORMATION, CENTRAL MONGOLIA
abstract	<p<New geochemical and petrological results are presented for greenstones from the Erdenetsogt Formation hosted by the Tsetserleg accretionary terrane in the Hangay region, with particular emphasis on newly found picritic and andesitic rocks. These rocks occur mostly in the lower portion of the Erdenetsogt Formation as massive lavas, sills, and dykes closely associated with varicolored bedded ribbon cherts and siltstones. The protoliths of the studied greenstones comprise (1) plume-derived tholeiitic greenstones with oceanic plateau basalt affinity, (2) arc-derived, calc-alkaline andesites. The plume-derived rocks are characterized by chemical signatures such as slight LREE enrichment similar to that of tholeiitic OIB and the existence of ferropicrite with high FeO* (>14 wt%) and MgO (12–22 wt%), which is characteristic of large igneous provinces (LIPs), including oceanic plateaus. Therefore, their tholeiitic composition and high-Fe and -Ti contents require melting of the source mantle peridotite with addition of some recycled Fe- and Ti-rich basaltic material. The andesites are characterized by glassy texture, high MgO content (up to 7 wt%), and significant LREE enrichment with depletion in Nb and resemble sanukite type of high-magnesian andesite (HMAs). We infer that the Hangay tholeiitic greenstones probably represent an accreted upper section of an oceanic plateau that developed in the deep-water region of the Hangay-Henteypaleo-ocean in the Upper Silurian-Lower Devonian. The Hangay HMAs may have been produced by subduction of young oceanic plate after an oceanward back-stepping of the subduction zone that was a result of the collision during the Carboniferous of the oceanic plateau and the active continental margin of the Central Mongolian Massif.</p<
abstractGer	<p<New geochemical and petrological results are presented for greenstones from the Erdenetsogt Formation hosted by the Tsetserleg accretionary terrane in the Hangay region, with particular emphasis on newly found picritic and andesitic rocks. These rocks occur mostly in the lower portion of the Erdenetsogt Formation as massive lavas, sills, and dykes closely associated with varicolored bedded ribbon cherts and siltstones. The protoliths of the studied greenstones comprise (1) plume-derived tholeiitic greenstones with oceanic plateau basalt affinity, (2) arc-derived, calc-alkaline andesites. The plume-derived rocks are characterized by chemical signatures such as slight LREE enrichment similar to that of tholeiitic OIB and the existence of ferropicrite with high FeO* (>14 wt%) and MgO (12–22 wt%), which is characteristic of large igneous provinces (LIPs), including oceanic plateaus. Therefore, their tholeiitic composition and high-Fe and -Ti contents require melting of the source mantle peridotite with addition of some recycled Fe- and Ti-rich basaltic material. The andesites are characterized by glassy texture, high MgO content (up to 7 wt%), and significant LREE enrichment with depletion in Nb and resemble sanukite type of high-magnesian andesite (HMAs). We infer that the Hangay tholeiitic greenstones probably represent an accreted upper section of an oceanic plateau that developed in the deep-water region of the Hangay-Henteypaleo-ocean in the Upper Silurian-Lower Devonian. The Hangay HMAs may have been produced by subduction of young oceanic plate after an oceanward back-stepping of the subduction zone that was a result of the collision during the Carboniferous of the oceanic plateau and the active continental margin of the Central Mongolian Massif.</p<
abstract_unstemmed	<p<New geochemical and petrological results are presented for greenstones from the Erdenetsogt Formation hosted by the Tsetserleg accretionary terrane in the Hangay region, with particular emphasis on newly found picritic and andesitic rocks. These rocks occur mostly in the lower portion of the Erdenetsogt Formation as massive lavas, sills, and dykes closely associated with varicolored bedded ribbon cherts and siltstones. The protoliths of the studied greenstones comprise (1) plume-derived tholeiitic greenstones with oceanic plateau basalt affinity, (2) arc-derived, calc-alkaline andesites. The plume-derived rocks are characterized by chemical signatures such as slight LREE enrichment similar to that of tholeiitic OIB and the existence of ferropicrite with high FeO* (>14 wt%) and MgO (12–22 wt%), which is characteristic of large igneous provinces (LIPs), including oceanic plateaus. Therefore, their tholeiitic composition and high-Fe and -Ti contents require melting of the source mantle peridotite with addition of some recycled Fe- and Ti-rich basaltic material. The andesites are characterized by glassy texture, high MgO content (up to 7 wt%), and significant LREE enrichment with depletion in Nb and resemble sanukite type of high-magnesian andesite (HMAs). We infer that the Hangay tholeiitic greenstones probably represent an accreted upper section of an oceanic plateau that developed in the deep-water region of the Hangay-Henteypaleo-ocean in the Upper Silurian-Lower Devonian. The Hangay HMAs may have been produced by subduction of young oceanic plate after an oceanward back-stepping of the subduction zone that was a result of the collision during the Carboniferous of the oceanic plateau and the active continental margin of the Central Mongolian Massif.</p<
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title_short	DISCOVERY OF FERROPICRITES AND HIGH-MAGNESIAN ANDESITES FROM THE ERDENETSOGT FORMATION, CENTRAL MONGOLIA
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