Mineralogy and petrology of gneiss hosted corundum deposits from the Day Nui Con Voi metamorphic range, Ailao Shan–Red River shear zone (North Vietnam)

Corundum deposits and occurrences are typically associated with marbles in northern Vietnam. Relatively little at- tention has been paid to corundum hosted by partly migmatized gneisses and pegmatoids of the Day Nui Con Voi range, Ailao Shan–Red River shear zone, North Vietnam. The partly migmatized gneisses contain gray, grayish white to bluish, and yellowish gray sapphires (type 1) while dark red to pinkish rubies occur in feldspathic pegmatoid rocks (type II). Corundum crystals from both types are short prismatic with partly hexagonal tabular shape considerably varying in size. Common inclusions are ilmenite, magnetite, rutile, plagioclase, muscovite, biotite, apatite, zircon, boehmite and iron stains. Growth structures and deformed twinning with star effect can be observed as well. Type I corundum is noted for high content of total Fe (5500 to 7133 ppm), low content of Cr and Ti (59 to 65 and 40 to 58 ppm, respectively), whereas, in corundum of type II the Fe and Cr contents are medium (1028 and 940 ppm, respectively), with low content of Ti (42 ppm). Gneisses hosting type I corundum are characterized by three different mineral parageneses (1) sillimanite+corundum+K-feldspar+biotite; (2) sillimanite+garnet+spinel+corundum+biotite+K- feldspar+plagioclase+ilmenite, and (3) sillimanite+garnet+spinel+corundum+clinopyroxene+ilmenite. Type II corundum occurs in feldspathic pegmatoid rocks consisting of a paragenesis garnet+biotite+plagioclase+K-feldspar+corundum. Sapphire in gneisses (type I) crystallized during regional metamorphism of silica undersaturated metapelites and metapsammites at upper amphibolite to lower granulite facies conditions. Ruby found in desilicated feldspathic rocks (type II) probably formed at the contact of migmatitized pegmatoid bodies with either metabasic to metaultrabasic rocks or marbles. The metamorphic P-T condition of corundum formation was estimated with 650 to 760 °C and 5.0 to 7.6 kbar based on thermobarometric calculations.40 K/40 Ar cooling ages obtained from biotite in gneisses indicate that the rocks reached ~300 °C at ~23 Ma. Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Anh Tuan, Duong [verfasserIn] Ngoc Khoi, Nguyen Van Nam, Nguyen Häger, Tobias Hauzenberger, Christoph A Thuy Duong, Nguyen

Format:	Artikel
Sprache:	Englisch

Erschienen:	2016

Schlagwörter:	paragenesis corundum deposit genetic aspects day nui con voi range petrology gneiss ailao shan–red river shear zone mineralogy

Übergeordnetes Werk:	Enthalten in: Neues Jahrbuch für Mineralogie / Abhandlungen - Stuttgart : Schweizerbart, 1950, 193(2016), 2, Seite 161-181
Übergeordnetes Werk:	volume:193 ; year:2016 ; number:2 ; pages:161-181

Links:	Volltext

DOI / URN:	10.1127/njma/2016/0300

Katalog-ID:	OLC1975112695

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520			\|a Corundum deposits and occurrences are typically associated with marbles in northern Vietnam. Relatively little at- tention has been paid to corundum hosted by partly migmatized gneisses and pegmatoids of the Day Nui Con Voi range, Ailao Shan–Red River shear zone, North Vietnam. The partly migmatized gneisses contain gray, grayish white to bluish, and yellowish gray sapphires (type 1) while dark red to pinkish rubies occur in feldspathic pegmatoid rocks (type II). Corundum crystals from both types are short prismatic with partly hexagonal tabular shape considerably varying in size. Common inclusions are ilmenite, magnetite, rutile, plagioclase, muscovite, biotite, apatite, zircon, boehmite and iron stains. Growth structures and deformed twinning with star effect can be observed as well. Type I corundum is noted for high content of total Fe (5500 to 7133 ppm), low content of Cr and Ti (59 to 65 and 40 to 58 ppm, respectively), whereas, in corundum of type II the Fe and Cr contents are medium (1028 and 940 ppm, respectively), with low content of Ti (42 ppm). Gneisses hosting type I corundum are characterized by three different mineral parageneses (1) sillimanite+corundum+K-feldspar+biotite; (2) sillimanite+garnet+spinel+corundum+biotite+K- feldspar+plagioclase+ilmenite, and (3) sillimanite+garnet+spinel+corundum+clinopyroxene+ilmenite. Type II corundum occurs in feldspathic pegmatoid rocks consisting of a paragenesis garnet+biotite+plagioclase+K-feldspar+corundum. Sapphire in gneisses (type I) crystallized during regional metamorphism of silica undersaturated metapelites and metapsammites at upper amphibolite to lower granulite facies conditions. Ruby found in desilicated feldspathic rocks (type II) probably formed at the contact of migmatitized pegmatoid bodies with either metabasic to metaultrabasic rocks or marbles. The metamorphic P-T condition of corundum formation was estimated with 650 to 760 °C and 5.0 to 7.6 kbar based on thermobarometric calculations.40 K/40 Ar cooling ages obtained from biotite in gneisses indicate that the rocks reached ~300 °C at ~23 Ma.
650		4	\|a paragenesis
650		4	\|a corundum deposit
650		4	\|a genetic aspects
650		4	\|a day nui con voi range
650		4	\|a petrology
650		4	\|a gneiss
650		4	\|a ailao shan–red river shear zone
650		4	\|a mineralogy
700	1		\|a Ngoc Khoi, Nguyen \|4 oth
700	1		\|a Van Nam, Nguyen \|4 oth
700	1		\|a Häger, Tobias \|4 oth
700	1		\|a Hauzenberger, Christoph A \|4 oth
700	1		\|a Thuy Duong, Nguyen \|4 oth
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matchkey_str	article:00777757:2016----::ieaoynptooyfnisotdoudmeoisrmhdyucnomtmrhcagalo
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allfields	10.1127/njma/2016/0300 doi PQ20160610 (DE-627)OLC1975112695 (DE-599)GBVOLC1975112695 (PRQ)s685-85ca8ebc4a91a7238f60ef2060e0e74047192981dd199ccb773f7ab87baed730 (KEY)0064947320160000193000200161mineralogyandpetrologyofgneisshostedcorundumdeposi DE-627 ger DE-627 rakwb eng 540 DNB 550 AVZ Anh Tuan, Duong verfasserin aut Mineralogy and petrology of gneiss hosted corundum deposits from the Day Nui Con Voi metamorphic range, Ailao Shan–Red River shear zone (North Vietnam) 2016 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Corundum deposits and occurrences are typically associated with marbles in northern Vietnam. Relatively little at- tention has been paid to corundum hosted by partly migmatized gneisses and pegmatoids of the Day Nui Con Voi range, Ailao Shan–Red River shear zone, North Vietnam. The partly migmatized gneisses contain gray, grayish white to bluish, and yellowish gray sapphires (type 1) while dark red to pinkish rubies occur in feldspathic pegmatoid rocks (type II). Corundum crystals from both types are short prismatic with partly hexagonal tabular shape considerably varying in size. Common inclusions are ilmenite, magnetite, rutile, plagioclase, muscovite, biotite, apatite, zircon, boehmite and iron stains. Growth structures and deformed twinning with star effect can be observed as well. Type I corundum is noted for high content of total Fe (5500 to 7133 ppm), low content of Cr and Ti (59 to 65 and 40 to 58 ppm, respectively), whereas, in corundum of type II the Fe and Cr contents are medium (1028 and 940 ppm, respectively), with low content of Ti (42 ppm). Gneisses hosting type I corundum are characterized by three different mineral parageneses (1) sillimanite+corundum+K-feldspar+biotite; (2) sillimanite+garnet+spinel+corundum+biotite+K- feldspar+plagioclase+ilmenite, and (3) sillimanite+garnet+spinel+corundum+clinopyroxene+ilmenite. Type II corundum occurs in feldspathic pegmatoid rocks consisting of a paragenesis garnet+biotite+plagioclase+K-feldspar+corundum. Sapphire in gneisses (type I) crystallized during regional metamorphism of silica undersaturated metapelites and metapsammites at upper amphibolite to lower granulite facies conditions. Ruby found in desilicated feldspathic rocks (type II) probably formed at the contact of migmatitized pegmatoid bodies with either metabasic to metaultrabasic rocks or marbles. The metamorphic P-T condition of corundum formation was estimated with 650 to 760 °C and 5.0 to 7.6 kbar based on thermobarometric calculations.40 K/40 Ar cooling ages obtained from biotite in gneisses indicate that the rocks reached ~300 °C at ~23 Ma. paragenesis corundum deposit genetic aspects day nui con voi range petrology gneiss ailao shan–red river shear zone mineralogy Ngoc Khoi, Nguyen oth Van Nam, Nguyen oth Häger, Tobias oth Hauzenberger, Christoph A oth Thuy Duong, Nguyen oth Enthalten in Neues Jahrbuch für Mineralogie / Abhandlungen Stuttgart : Schweizerbart, 1950 193(2016), 2, Seite 161-181 (DE-627)129304662 (DE-600)123943-0 (DE-576)014499770 0077-7757 nnns volume:193 year:2016 number:2 pages:161-181 http://dx.doi.org/10.1127/njma/2016/0300 Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_21 GBV_ILN_24 GBV_ILN_30 GBV_ILN_65 GBV_ILN_70 GBV_ILN_188 GBV_ILN_2004 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_2018 GBV_ILN_2027 GBV_ILN_2173 GBV_ILN_2346 GBV_ILN_4046 GBV_ILN_4277 AR 193 2016 2 161-181
spelling	10.1127/njma/2016/0300 doi PQ20160610 (DE-627)OLC1975112695 (DE-599)GBVOLC1975112695 (PRQ)s685-85ca8ebc4a91a7238f60ef2060e0e74047192981dd199ccb773f7ab87baed730 (KEY)0064947320160000193000200161mineralogyandpetrologyofgneisshostedcorundumdeposi DE-627 ger DE-627 rakwb eng 540 DNB 550 AVZ Anh Tuan, Duong verfasserin aut Mineralogy and petrology of gneiss hosted corundum deposits from the Day Nui Con Voi metamorphic range, Ailao Shan–Red River shear zone (North Vietnam) 2016 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Corundum deposits and occurrences are typically associated with marbles in northern Vietnam. Relatively little at- tention has been paid to corundum hosted by partly migmatized gneisses and pegmatoids of the Day Nui Con Voi range, Ailao Shan–Red River shear zone, North Vietnam. The partly migmatized gneisses contain gray, grayish white to bluish, and yellowish gray sapphires (type 1) while dark red to pinkish rubies occur in feldspathic pegmatoid rocks (type II). Corundum crystals from both types are short prismatic with partly hexagonal tabular shape considerably varying in size. Common inclusions are ilmenite, magnetite, rutile, plagioclase, muscovite, biotite, apatite, zircon, boehmite and iron stains. Growth structures and deformed twinning with star effect can be observed as well. Type I corundum is noted for high content of total Fe (5500 to 7133 ppm), low content of Cr and Ti (59 to 65 and 40 to 58 ppm, respectively), whereas, in corundum of type II the Fe and Cr contents are medium (1028 and 940 ppm, respectively), with low content of Ti (42 ppm). Gneisses hosting type I corundum are characterized by three different mineral parageneses (1) sillimanite+corundum+K-feldspar+biotite; (2) sillimanite+garnet+spinel+corundum+biotite+K- feldspar+plagioclase+ilmenite, and (3) sillimanite+garnet+spinel+corundum+clinopyroxene+ilmenite. Type II corundum occurs in feldspathic pegmatoid rocks consisting of a paragenesis garnet+biotite+plagioclase+K-feldspar+corundum. Sapphire in gneisses (type I) crystallized during regional metamorphism of silica undersaturated metapelites and metapsammites at upper amphibolite to lower granulite facies conditions. Ruby found in desilicated feldspathic rocks (type II) probably formed at the contact of migmatitized pegmatoid bodies with either metabasic to metaultrabasic rocks or marbles. The metamorphic P-T condition of corundum formation was estimated with 650 to 760 °C and 5.0 to 7.6 kbar based on thermobarometric calculations.40 K/40 Ar cooling ages obtained from biotite in gneisses indicate that the rocks reached ~300 °C at ~23 Ma. paragenesis corundum deposit genetic aspects day nui con voi range petrology gneiss ailao shan–red river shear zone mineralogy Ngoc Khoi, Nguyen oth Van Nam, Nguyen oth Häger, Tobias oth Hauzenberger, Christoph A oth Thuy Duong, Nguyen oth Enthalten in Neues Jahrbuch für Mineralogie / Abhandlungen Stuttgart : Schweizerbart, 1950 193(2016), 2, Seite 161-181 (DE-627)129304662 (DE-600)123943-0 (DE-576)014499770 0077-7757 nnns volume:193 year:2016 number:2 pages:161-181 http://dx.doi.org/10.1127/njma/2016/0300 Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_21 GBV_ILN_24 GBV_ILN_30 GBV_ILN_65 GBV_ILN_70 GBV_ILN_188 GBV_ILN_2004 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_2018 GBV_ILN_2027 GBV_ILN_2173 GBV_ILN_2346 GBV_ILN_4046 GBV_ILN_4277 AR 193 2016 2 161-181
allfields_unstemmed	10.1127/njma/2016/0300 doi PQ20160610 (DE-627)OLC1975112695 (DE-599)GBVOLC1975112695 (PRQ)s685-85ca8ebc4a91a7238f60ef2060e0e74047192981dd199ccb773f7ab87baed730 (KEY)0064947320160000193000200161mineralogyandpetrologyofgneisshostedcorundumdeposi DE-627 ger DE-627 rakwb eng 540 DNB 550 AVZ Anh Tuan, Duong verfasserin aut Mineralogy and petrology of gneiss hosted corundum deposits from the Day Nui Con Voi metamorphic range, Ailao Shan–Red River shear zone (North Vietnam) 2016 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Corundum deposits and occurrences are typically associated with marbles in northern Vietnam. Relatively little at- tention has been paid to corundum hosted by partly migmatized gneisses and pegmatoids of the Day Nui Con Voi range, Ailao Shan–Red River shear zone, North Vietnam. The partly migmatized gneisses contain gray, grayish white to bluish, and yellowish gray sapphires (type 1) while dark red to pinkish rubies occur in feldspathic pegmatoid rocks (type II). Corundum crystals from both types are short prismatic with partly hexagonal tabular shape considerably varying in size. Common inclusions are ilmenite, magnetite, rutile, plagioclase, muscovite, biotite, apatite, zircon, boehmite and iron stains. Growth structures and deformed twinning with star effect can be observed as well. Type I corundum is noted for high content of total Fe (5500 to 7133 ppm), low content of Cr and Ti (59 to 65 and 40 to 58 ppm, respectively), whereas, in corundum of type II the Fe and Cr contents are medium (1028 and 940 ppm, respectively), with low content of Ti (42 ppm). Gneisses hosting type I corundum are characterized by three different mineral parageneses (1) sillimanite+corundum+K-feldspar+biotite; (2) sillimanite+garnet+spinel+corundum+biotite+K- feldspar+plagioclase+ilmenite, and (3) sillimanite+garnet+spinel+corundum+clinopyroxene+ilmenite. Type II corundum occurs in feldspathic pegmatoid rocks consisting of a paragenesis garnet+biotite+plagioclase+K-feldspar+corundum. Sapphire in gneisses (type I) crystallized during regional metamorphism of silica undersaturated metapelites and metapsammites at upper amphibolite to lower granulite facies conditions. Ruby found in desilicated feldspathic rocks (type II) probably formed at the contact of migmatitized pegmatoid bodies with either metabasic to metaultrabasic rocks or marbles. The metamorphic P-T condition of corundum formation was estimated with 650 to 760 °C and 5.0 to 7.6 kbar based on thermobarometric calculations.40 K/40 Ar cooling ages obtained from biotite in gneisses indicate that the rocks reached ~300 °C at ~23 Ma. paragenesis corundum deposit genetic aspects day nui con voi range petrology gneiss ailao shan–red river shear zone mineralogy Ngoc Khoi, Nguyen oth Van Nam, Nguyen oth Häger, Tobias oth Hauzenberger, Christoph A oth Thuy Duong, Nguyen oth Enthalten in Neues Jahrbuch für Mineralogie / Abhandlungen Stuttgart : Schweizerbart, 1950 193(2016), 2, Seite 161-181 (DE-627)129304662 (DE-600)123943-0 (DE-576)014499770 0077-7757 nnns volume:193 year:2016 number:2 pages:161-181 http://dx.doi.org/10.1127/njma/2016/0300 Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_21 GBV_ILN_24 GBV_ILN_30 GBV_ILN_65 GBV_ILN_70 GBV_ILN_188 GBV_ILN_2004 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_2018 GBV_ILN_2027 GBV_ILN_2173 GBV_ILN_2346 GBV_ILN_4046 GBV_ILN_4277 AR 193 2016 2 161-181
allfieldsGer	10.1127/njma/2016/0300 doi PQ20160610 (DE-627)OLC1975112695 (DE-599)GBVOLC1975112695 (PRQ)s685-85ca8ebc4a91a7238f60ef2060e0e74047192981dd199ccb773f7ab87baed730 (KEY)0064947320160000193000200161mineralogyandpetrologyofgneisshostedcorundumdeposi DE-627 ger DE-627 rakwb eng 540 DNB 550 AVZ Anh Tuan, Duong verfasserin aut Mineralogy and petrology of gneiss hosted corundum deposits from the Day Nui Con Voi metamorphic range, Ailao Shan–Red River shear zone (North Vietnam) 2016 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Corundum deposits and occurrences are typically associated with marbles in northern Vietnam. Relatively little at- tention has been paid to corundum hosted by partly migmatized gneisses and pegmatoids of the Day Nui Con Voi range, Ailao Shan–Red River shear zone, North Vietnam. The partly migmatized gneisses contain gray, grayish white to bluish, and yellowish gray sapphires (type 1) while dark red to pinkish rubies occur in feldspathic pegmatoid rocks (type II). Corundum crystals from both types are short prismatic with partly hexagonal tabular shape considerably varying in size. Common inclusions are ilmenite, magnetite, rutile, plagioclase, muscovite, biotite, apatite, zircon, boehmite and iron stains. Growth structures and deformed twinning with star effect can be observed as well. Type I corundum is noted for high content of total Fe (5500 to 7133 ppm), low content of Cr and Ti (59 to 65 and 40 to 58 ppm, respectively), whereas, in corundum of type II the Fe and Cr contents are medium (1028 and 940 ppm, respectively), with low content of Ti (42 ppm). Gneisses hosting type I corundum are characterized by three different mineral parageneses (1) sillimanite+corundum+K-feldspar+biotite; (2) sillimanite+garnet+spinel+corundum+biotite+K- feldspar+plagioclase+ilmenite, and (3) sillimanite+garnet+spinel+corundum+clinopyroxene+ilmenite. Type II corundum occurs in feldspathic pegmatoid rocks consisting of a paragenesis garnet+biotite+plagioclase+K-feldspar+corundum. Sapphire in gneisses (type I) crystallized during regional metamorphism of silica undersaturated metapelites and metapsammites at upper amphibolite to lower granulite facies conditions. Ruby found in desilicated feldspathic rocks (type II) probably formed at the contact of migmatitized pegmatoid bodies with either metabasic to metaultrabasic rocks or marbles. The metamorphic P-T condition of corundum formation was estimated with 650 to 760 °C and 5.0 to 7.6 kbar based on thermobarometric calculations.40 K/40 Ar cooling ages obtained from biotite in gneisses indicate that the rocks reached ~300 °C at ~23 Ma. paragenesis corundum deposit genetic aspects day nui con voi range petrology gneiss ailao shan–red river shear zone mineralogy Ngoc Khoi, Nguyen oth Van Nam, Nguyen oth Häger, Tobias oth Hauzenberger, Christoph A oth Thuy Duong, Nguyen oth Enthalten in Neues Jahrbuch für Mineralogie / Abhandlungen Stuttgart : Schweizerbart, 1950 193(2016), 2, Seite 161-181 (DE-627)129304662 (DE-600)123943-0 (DE-576)014499770 0077-7757 nnns volume:193 year:2016 number:2 pages:161-181 http://dx.doi.org/10.1127/njma/2016/0300 Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_21 GBV_ILN_24 GBV_ILN_30 GBV_ILN_65 GBV_ILN_70 GBV_ILN_188 GBV_ILN_2004 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_2018 GBV_ILN_2027 GBV_ILN_2173 GBV_ILN_2346 GBV_ILN_4046 GBV_ILN_4277 AR 193 2016 2 161-181
allfieldsSound	10.1127/njma/2016/0300 doi PQ20160610 (DE-627)OLC1975112695 (DE-599)GBVOLC1975112695 (PRQ)s685-85ca8ebc4a91a7238f60ef2060e0e74047192981dd199ccb773f7ab87baed730 (KEY)0064947320160000193000200161mineralogyandpetrologyofgneisshostedcorundumdeposi DE-627 ger DE-627 rakwb eng 540 DNB 550 AVZ Anh Tuan, Duong verfasserin aut Mineralogy and petrology of gneiss hosted corundum deposits from the Day Nui Con Voi metamorphic range, Ailao Shan–Red River shear zone (North Vietnam) 2016 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Corundum deposits and occurrences are typically associated with marbles in northern Vietnam. Relatively little at- tention has been paid to corundum hosted by partly migmatized gneisses and pegmatoids of the Day Nui Con Voi range, Ailao Shan–Red River shear zone, North Vietnam. The partly migmatized gneisses contain gray, grayish white to bluish, and yellowish gray sapphires (type 1) while dark red to pinkish rubies occur in feldspathic pegmatoid rocks (type II). Corundum crystals from both types are short prismatic with partly hexagonal tabular shape considerably varying in size. Common inclusions are ilmenite, magnetite, rutile, plagioclase, muscovite, biotite, apatite, zircon, boehmite and iron stains. Growth structures and deformed twinning with star effect can be observed as well. Type I corundum is noted for high content of total Fe (5500 to 7133 ppm), low content of Cr and Ti (59 to 65 and 40 to 58 ppm, respectively), whereas, in corundum of type II the Fe and Cr contents are medium (1028 and 940 ppm, respectively), with low content of Ti (42 ppm). Gneisses hosting type I corundum are characterized by three different mineral parageneses (1) sillimanite+corundum+K-feldspar+biotite; (2) sillimanite+garnet+spinel+corundum+biotite+K- feldspar+plagioclase+ilmenite, and (3) sillimanite+garnet+spinel+corundum+clinopyroxene+ilmenite. Type II corundum occurs in feldspathic pegmatoid rocks consisting of a paragenesis garnet+biotite+plagioclase+K-feldspar+corundum. Sapphire in gneisses (type I) crystallized during regional metamorphism of silica undersaturated metapelites and metapsammites at upper amphibolite to lower granulite facies conditions. Ruby found in desilicated feldspathic rocks (type II) probably formed at the contact of migmatitized pegmatoid bodies with either metabasic to metaultrabasic rocks or marbles. The metamorphic P-T condition of corundum formation was estimated with 650 to 760 °C and 5.0 to 7.6 kbar based on thermobarometric calculations.40 K/40 Ar cooling ages obtained from biotite in gneisses indicate that the rocks reached ~300 °C at ~23 Ma. paragenesis corundum deposit genetic aspects day nui con voi range petrology gneiss ailao shan–red river shear zone mineralogy Ngoc Khoi, Nguyen oth Van Nam, Nguyen oth Häger, Tobias oth Hauzenberger, Christoph A oth Thuy Duong, Nguyen oth Enthalten in Neues Jahrbuch für Mineralogie / Abhandlungen Stuttgart : Schweizerbart, 1950 193(2016), 2, Seite 161-181 (DE-627)129304662 (DE-600)123943-0 (DE-576)014499770 0077-7757 nnns volume:193 year:2016 number:2 pages:161-181 http://dx.doi.org/10.1127/njma/2016/0300 Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_21 GBV_ILN_24 GBV_ILN_30 GBV_ILN_65 GBV_ILN_70 GBV_ILN_188 GBV_ILN_2004 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_2018 GBV_ILN_2027 GBV_ILN_2173 GBV_ILN_2346 GBV_ILN_4046 GBV_ILN_4277 AR 193 2016 2 161-181
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source	Enthalten in Neues Jahrbuch für Mineralogie / Abhandlungen 193(2016), 2, Seite 161-181 volume:193 year:2016 number:2 pages:161-181
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author	Anh Tuan, Duong
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topic_title	540 DNB 550 AVZ Mineralogy and petrology of gneiss hosted corundum deposits from the Day Nui Con Voi metamorphic range, Ailao Shan–Red River shear zone (North Vietnam) paragenesis corundum deposit genetic aspects day nui con voi range petrology gneiss ailao shan–red river shear zone mineralogy
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title	Mineralogy and petrology of gneiss hosted corundum deposits from the Day Nui Con Voi metamorphic range, Ailao Shan–Red River shear zone (North Vietnam)
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title_sort	mineralogy and petrology of gneiss hosted corundum deposits from the day nui con voi metamorphic range, ailao shan–red river shear zone (north vietnam)
title_auth	Mineralogy and petrology of gneiss hosted corundum deposits from the Day Nui Con Voi metamorphic range, Ailao Shan–Red River shear zone (North Vietnam)
abstract	Corundum deposits and occurrences are typically associated with marbles in northern Vietnam. Relatively little at- tention has been paid to corundum hosted by partly migmatized gneisses and pegmatoids of the Day Nui Con Voi range, Ailao Shan–Red River shear zone, North Vietnam. The partly migmatized gneisses contain gray, grayish white to bluish, and yellowish gray sapphires (type 1) while dark red to pinkish rubies occur in feldspathic pegmatoid rocks (type II). Corundum crystals from both types are short prismatic with partly hexagonal tabular shape considerably varying in size. Common inclusions are ilmenite, magnetite, rutile, plagioclase, muscovite, biotite, apatite, zircon, boehmite and iron stains. Growth structures and deformed twinning with star effect can be observed as well. Type I corundum is noted for high content of total Fe (5500 to 7133 ppm), low content of Cr and Ti (59 to 65 and 40 to 58 ppm, respectively), whereas, in corundum of type II the Fe and Cr contents are medium (1028 and 940 ppm, respectively), with low content of Ti (42 ppm). Gneisses hosting type I corundum are characterized by three different mineral parageneses (1) sillimanite+corundum+K-feldspar+biotite; (2) sillimanite+garnet+spinel+corundum+biotite+K- feldspar+plagioclase+ilmenite, and (3) sillimanite+garnet+spinel+corundum+clinopyroxene+ilmenite. Type II corundum occurs in feldspathic pegmatoid rocks consisting of a paragenesis garnet+biotite+plagioclase+K-feldspar+corundum. Sapphire in gneisses (type I) crystallized during regional metamorphism of silica undersaturated metapelites and metapsammites at upper amphibolite to lower granulite facies conditions. Ruby found in desilicated feldspathic rocks (type II) probably formed at the contact of migmatitized pegmatoid bodies with either metabasic to metaultrabasic rocks or marbles. The metamorphic P-T condition of corundum formation was estimated with 650 to 760 °C and 5.0 to 7.6 kbar based on thermobarometric calculations.40 K/40 Ar cooling ages obtained from biotite in gneisses indicate that the rocks reached ~300 °C at ~23 Ma.
abstractGer	Corundum deposits and occurrences are typically associated with marbles in northern Vietnam. Relatively little at- tention has been paid to corundum hosted by partly migmatized gneisses and pegmatoids of the Day Nui Con Voi range, Ailao Shan–Red River shear zone, North Vietnam. The partly migmatized gneisses contain gray, grayish white to bluish, and yellowish gray sapphires (type 1) while dark red to pinkish rubies occur in feldspathic pegmatoid rocks (type II). Corundum crystals from both types are short prismatic with partly hexagonal tabular shape considerably varying in size. Common inclusions are ilmenite, magnetite, rutile, plagioclase, muscovite, biotite, apatite, zircon, boehmite and iron stains. Growth structures and deformed twinning with star effect can be observed as well. Type I corundum is noted for high content of total Fe (5500 to 7133 ppm), low content of Cr and Ti (59 to 65 and 40 to 58 ppm, respectively), whereas, in corundum of type II the Fe and Cr contents are medium (1028 and 940 ppm, respectively), with low content of Ti (42 ppm). Gneisses hosting type I corundum are characterized by three different mineral parageneses (1) sillimanite+corundum+K-feldspar+biotite; (2) sillimanite+garnet+spinel+corundum+biotite+K- feldspar+plagioclase+ilmenite, and (3) sillimanite+garnet+spinel+corundum+clinopyroxene+ilmenite. Type II corundum occurs in feldspathic pegmatoid rocks consisting of a paragenesis garnet+biotite+plagioclase+K-feldspar+corundum. Sapphire in gneisses (type I) crystallized during regional metamorphism of silica undersaturated metapelites and metapsammites at upper amphibolite to lower granulite facies conditions. Ruby found in desilicated feldspathic rocks (type II) probably formed at the contact of migmatitized pegmatoid bodies with either metabasic to metaultrabasic rocks or marbles. The metamorphic P-T condition of corundum formation was estimated with 650 to 760 °C and 5.0 to 7.6 kbar based on thermobarometric calculations.40 K/40 Ar cooling ages obtained from biotite in gneisses indicate that the rocks reached ~300 °C at ~23 Ma.
abstract_unstemmed	Corundum deposits and occurrences are typically associated with marbles in northern Vietnam. Relatively little at- tention has been paid to corundum hosted by partly migmatized gneisses and pegmatoids of the Day Nui Con Voi range, Ailao Shan–Red River shear zone, North Vietnam. The partly migmatized gneisses contain gray, grayish white to bluish, and yellowish gray sapphires (type 1) while dark red to pinkish rubies occur in feldspathic pegmatoid rocks (type II). Corundum crystals from both types are short prismatic with partly hexagonal tabular shape considerably varying in size. Common inclusions are ilmenite, magnetite, rutile, plagioclase, muscovite, biotite, apatite, zircon, boehmite and iron stains. Growth structures and deformed twinning with star effect can be observed as well. Type I corundum is noted for high content of total Fe (5500 to 7133 ppm), low content of Cr and Ti (59 to 65 and 40 to 58 ppm, respectively), whereas, in corundum of type II the Fe and Cr contents are medium (1028 and 940 ppm, respectively), with low content of Ti (42 ppm). Gneisses hosting type I corundum are characterized by three different mineral parageneses (1) sillimanite+corundum+K-feldspar+biotite; (2) sillimanite+garnet+spinel+corundum+biotite+K- feldspar+plagioclase+ilmenite, and (3) sillimanite+garnet+spinel+corundum+clinopyroxene+ilmenite. Type II corundum occurs in feldspathic pegmatoid rocks consisting of a paragenesis garnet+biotite+plagioclase+K-feldspar+corundum. Sapphire in gneisses (type I) crystallized during regional metamorphism of silica undersaturated metapelites and metapsammites at upper amphibolite to lower granulite facies conditions. Ruby found in desilicated feldspathic rocks (type II) probably formed at the contact of migmatitized pegmatoid bodies with either metabasic to metaultrabasic rocks or marbles. The metamorphic P-T condition of corundum formation was estimated with 650 to 760 °C and 5.0 to 7.6 kbar based on thermobarometric calculations.40 K/40 Ar cooling ages obtained from biotite in gneisses indicate that the rocks reached ~300 °C at ~23 Ma.
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title_short	Mineralogy and petrology of gneiss hosted corundum deposits from the Day Nui Con Voi metamorphic range, Ailao Shan–Red River shear zone (North Vietnam)
url	http://dx.doi.org/10.1127/njma/2016/0300
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author2	Ngoc Khoi, Nguyen Van Nam, Nguyen Häger, Tobias Hauzenberger, Christoph A Thuy Duong, Nguyen
author2Str	Ngoc Khoi, Nguyen Van Nam, Nguyen Häger, Tobias Hauzenberger, Christoph A Thuy Duong, Nguyen
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doi_str	10.1127/njma/2016/0300
up_date	2024-07-04T05:48:42.046Z
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Mineralogy and petrology of gneiss hosted corundum deposits from the Day Nui Con Voi metamorphic range, Ailao Shan–Red River shear zone (North Vietnam)

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