Tourmalinites from the Eastern Sierras Pampeanas, Argentina

In the eastern Sierras Pampeanas, Central Argentina, tourmalinites and coticules are found in close association with stratabound scheelite deposits in metamorphic terranes. In Sierra Grande (Agua de Ramón and Ambul districts) and Sierra de Altautina, tourmalinites are associated with stratabound sch...

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Detalles Bibliográficos
Autores principales: Tourn, S.M., Herrmann, C.J., Ametrano, S., de Brodtkorb, M.K.
Formato: JOUR
Materias:
Argentina
Boron isotopes
Eastern Sierras Pampeanas
Regional metamorphism
Remobilisation
Tourmalinites
Tungsten deposits
Boron
Deposits
Isotopes
Minerals
Tungsten
Metamorphic terranes
Volcanogenic exhalations
Stratigraphy
boron isotope
metamorphism
ore deposit
scheelite
tourmaline
Pampas
South America
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_01691368_v24_n3-4_p229_Tourn
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_01691368_v24_n3-4_p229_Tourn
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spelling todo:paper_01691368_v24_n3-4_p229_Tourn2023-10-03T15:06:58Z Tourmalinites from the Eastern Sierras Pampeanas, Argentina Tourn, S.M. Herrmann, C.J. Ametrano, S. de Brodtkorb, M.K. Argentina Boron isotopes Eastern Sierras Pampeanas Regional metamorphism Remobilisation Tourmalinites Tungsten deposits Boron Deposits Isotopes Minerals Tungsten Metamorphic terranes Volcanogenic exhalations Stratigraphy boron isotope metamorphism ore deposit scheelite tourmaline Argentina Pampas South America In the eastern Sierras Pampeanas, Central Argentina, tourmalinites and coticules are found in close association with stratabound scheelite deposits in metamorphic terranes. In Sierra Grande (Agua de Ramón and Ambul districts) and Sierra de Altautina, tourmalinites are associated with stratabound scheelite deposits related to orthoamphibolites. In the Pampa del Tamboreo area, tourmalinites are located in biotite schists stratigraphically related to acid to intermediate metavolcanic rocks and scheelite-bearing quartzites. The mineral chemistry and boron isotopic compositions of tourmalinite-hosted and vein-hosted tourmalines are investigated. Overall, the tourmalines belong to the dravite-schorl series and are generally aluminous; Fe/(Fe+Mg) ranges from 0.33 to 0.85, Al/(Al+Fe+Mg) from 0.66 to 0.76 and the amount of X-site vacancy (0.12-0.48) indicates significant foitite components. Their boron isotopic compositions ( δ 11B) are from -24.0‰ to-15.0‰.Similar mineral chemistries and boron isotopic values for tourmaline in tourmalinites related to stratabound scheelite mineralisation and in tungsten-bearing quartz veins suggest a common source for the boron and probably the tungsten. The field, chemical and isotopic relationships are consistent with tungsten and boron in quartz-vein deposits being remobilised from stratabound scheelite and tourmalinite, dominantly by liquid-state transfer associated with regional shear zones. Tungsten and boron in the original sedimentary sequence (now meta-exhalites) are ascribed to volcanogenic exhalations. © 2003 Elsevier B.V. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01691368_v24_n3-4_p229_Tourn
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Argentina
Boron isotopes
Eastern Sierras Pampeanas
Regional metamorphism
Remobilisation
Tourmalinites
Tungsten deposits
Boron
Deposits
Isotopes
Minerals
Tungsten
Metamorphic terranes
Volcanogenic exhalations
Stratigraphy
boron isotope
metamorphism
ore deposit
scheelite
tourmaline
Argentina
Pampas
South America
spellingShingle Argentina
Boron isotopes
Eastern Sierras Pampeanas
Regional metamorphism
Remobilisation
Tourmalinites
Tungsten deposits
Boron
Deposits
Isotopes
Minerals
Tungsten
Metamorphic terranes
Volcanogenic exhalations
Stratigraphy
boron isotope
metamorphism
ore deposit
scheelite
tourmaline
Argentina
Pampas
South America
Tourn, S.M.
Herrmann, C.J.
Ametrano, S.
de Brodtkorb, M.K.
Tourmalinites from the Eastern Sierras Pampeanas, Argentina
topic_facet Argentina
Boron isotopes
Eastern Sierras Pampeanas
Regional metamorphism
Remobilisation
Tourmalinites
Tungsten deposits
Boron
Deposits
Isotopes
Minerals
Tungsten
Metamorphic terranes
Volcanogenic exhalations
Stratigraphy
boron isotope
metamorphism
ore deposit
scheelite
tourmaline
Argentina
Pampas
South America
description In the eastern Sierras Pampeanas, Central Argentina, tourmalinites and coticules are found in close association with stratabound scheelite deposits in metamorphic terranes. In Sierra Grande (Agua de Ramón and Ambul districts) and Sierra de Altautina, tourmalinites are associated with stratabound scheelite deposits related to orthoamphibolites. In the Pampa del Tamboreo area, tourmalinites are located in biotite schists stratigraphically related to acid to intermediate metavolcanic rocks and scheelite-bearing quartzites. The mineral chemistry and boron isotopic compositions of tourmalinite-hosted and vein-hosted tourmalines are investigated. Overall, the tourmalines belong to the dravite-schorl series and are generally aluminous; Fe/(Fe+Mg) ranges from 0.33 to 0.85, Al/(Al+Fe+Mg) from 0.66 to 0.76 and the amount of X-site vacancy (0.12-0.48) indicates significant foitite components. Their boron isotopic compositions ( δ 11B) are from -24.0‰ to-15.0‰.Similar mineral chemistries and boron isotopic values for tourmaline in tourmalinites related to stratabound scheelite mineralisation and in tungsten-bearing quartz veins suggest a common source for the boron and probably the tungsten. The field, chemical and isotopic relationships are consistent with tungsten and boron in quartz-vein deposits being remobilised from stratabound scheelite and tourmalinite, dominantly by liquid-state transfer associated with regional shear zones. Tungsten and boron in the original sedimentary sequence (now meta-exhalites) are ascribed to volcanogenic exhalations. © 2003 Elsevier B.V. All rights reserved.
format JOUR
author Tourn, S.M.
Herrmann, C.J.
Ametrano, S.
de Brodtkorb, M.K.
author_facet Tourn, S.M.
Herrmann, C.J.
Ametrano, S.
de Brodtkorb, M.K.
author_sort Tourn, S.M.
title Tourmalinites from the Eastern Sierras Pampeanas, Argentina
title_short Tourmalinites from the Eastern Sierras Pampeanas, Argentina
title_full Tourmalinites from the Eastern Sierras Pampeanas, Argentina
title_fullStr Tourmalinites from the Eastern Sierras Pampeanas, Argentina
title_full_unstemmed Tourmalinites from the Eastern Sierras Pampeanas, Argentina
title_sort tourmalinites from the eastern sierras pampeanas, argentina
url http://hdl.handle.net/20.500.12110/paper_01691368_v24_n3-4_p229_Tourn
work_keys_str_mv AT tournsm tourmalinitesfromtheeasternsierraspampeanasargentina
AT herrmanncj tourmalinitesfromtheeasternsierraspampeanasargentina
AT ametranos tourmalinitesfromtheeasternsierraspampeanasargentina
AT debrodtkorbmk tourmalinitesfromtheeasternsierraspampeanasargentina
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