Geology of the basement of the northeastern border of the las chacras-piedras coloradas batholith, libertador general san martín, San Luis province

The studied area is located in the northeast of the Sierra de San Luis, and southwest of the Libertador General San Martín town, near Los Avestruces tungsten deposit and east of the Las Chacras-Piedras Coloradas Batholith. Even though this sector belongs to the Conlara Metamorphic Complex, it presen...

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Autores principales: Martínez, A.L., Montenegro, T., Higa, L.
Formato: JOUR
Materias:
Conlara Metamorphic Complex
Igneous-metamorphic basement
San Luis Range
aplite
basement rock
batholith
boudinage
gneiss
granite
lithology
metamorphic rock
migmatite
Argentina
San Luis
Sierra de San Luis [Sierras Pampeanas]
Sierras Pampeanas
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v72_n4_p563_Martinez
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00044822_v72_n4_p563_Martinez
record_format dspace
spelling todo:paper_00044822_v72_n4_p563_Martinez2023-10-03T13:59:11Z Geology of the basement of the northeastern border of the las chacras-piedras coloradas batholith, libertador general san martín, San Luis province Martínez, A.L. Montenegro, T. Higa, L. Conlara Metamorphic Complex Igneous-metamorphic basement San Luis Range aplite basement rock batholith boudinage gneiss granite lithology metamorphic rock migmatite Argentina San Luis Sierra de San Luis [Sierras Pampeanas] Sierras Pampeanas The studied area is located in the northeast of the Sierra de San Luis, and southwest of the Libertador General San Martín town, near Los Avestruces tungsten deposit and east of the Las Chacras-Piedras Coloradas Batholith. Even though this sector belongs to the Conlara Metamorphic Complex, it presents different lithological and structural features between eastern and western areas. In the eastern area, medium grain quartz, biotite and calc-silicate schists, and gneisses outcrop. Granites, pegmatites-frequently with boudinage structures-, and aplites, are conformably hosted in the metamorphic sequence. Scheelite and wolframite veins with associated lamprophyres are common in this area. The western area, however, consists of an assemblage of biotite and tourmaline schists, phyllites and meta-sandstones. The same types of intrusive rocks outcrop in this area, but the pegmatites are intensely folded. The tungsten veins are scarce. Granitoid rocks in both sectors show similar geochemical features to other Famatinian granitoids of the sierra. While both sectors reach amphibolite facies, structure directions are different. In the eastern area structures show predominant NE direction while the western area shows preferentially NNW orientation of the structures. Consequently, the eastern area can be linked with the gneisses and migmatites of the Conlara Metamorphic Complex while the western area outcrops resembles to those at the North of the Sierra, which were grouped under the name of Metamorfitas San Martín y Las Higueras according to previous authors. © 2015, Asociacion Geologica Argentina. 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_00044822_v72_n4_p563_Martinez
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Conlara Metamorphic Complex
Igneous-metamorphic basement
San Luis Range
aplite
basement rock
batholith
boudinage
gneiss
granite
lithology
metamorphic rock
migmatite
Argentina
San Luis
Sierra de San Luis [Sierras Pampeanas]
Sierras Pampeanas
spellingShingle Conlara Metamorphic Complex
Igneous-metamorphic basement
San Luis Range
aplite
basement rock
batholith
boudinage
gneiss
granite
lithology
metamorphic rock
migmatite
Argentina
San Luis
Sierra de San Luis [Sierras Pampeanas]
Sierras Pampeanas
Martínez, A.L.
Montenegro, T.
Higa, L.
Geology of the basement of the northeastern border of the las chacras-piedras coloradas batholith, libertador general san martín, San Luis province
topic_facet Conlara Metamorphic Complex
Igneous-metamorphic basement
San Luis Range
aplite
basement rock
batholith
boudinage
gneiss
granite
lithology
metamorphic rock
migmatite
Argentina
San Luis
Sierra de San Luis [Sierras Pampeanas]
Sierras Pampeanas
description The studied area is located in the northeast of the Sierra de San Luis, and southwest of the Libertador General San Martín town, near Los Avestruces tungsten deposit and east of the Las Chacras-Piedras Coloradas Batholith. Even though this sector belongs to the Conlara Metamorphic Complex, it presents different lithological and structural features between eastern and western areas. In the eastern area, medium grain quartz, biotite and calc-silicate schists, and gneisses outcrop. Granites, pegmatites-frequently with boudinage structures-, and aplites, are conformably hosted in the metamorphic sequence. Scheelite and wolframite veins with associated lamprophyres are common in this area. The western area, however, consists of an assemblage of biotite and tourmaline schists, phyllites and meta-sandstones. The same types of intrusive rocks outcrop in this area, but the pegmatites are intensely folded. The tungsten veins are scarce. Granitoid rocks in both sectors show similar geochemical features to other Famatinian granitoids of the sierra. While both sectors reach amphibolite facies, structure directions are different. In the eastern area structures show predominant NE direction while the western area shows preferentially NNW orientation of the structures. Consequently, the eastern area can be linked with the gneisses and migmatites of the Conlara Metamorphic Complex while the western area outcrops resembles to those at the North of the Sierra, which were grouped under the name of Metamorfitas San Martín y Las Higueras according to previous authors. © 2015, Asociacion Geologica Argentina. All Rights Reserved.
format JOUR
author Martínez, A.L.
Montenegro, T.
Higa, L.
author_facet Martínez, A.L.
Montenegro, T.
Higa, L.
author_sort Martínez, A.L.
title Geology of the basement of the northeastern border of the las chacras-piedras coloradas batholith, libertador general san martín, San Luis province
title_short Geology of the basement of the northeastern border of the las chacras-piedras coloradas batholith, libertador general san martín, San Luis province
title_full Geology of the basement of the northeastern border of the las chacras-piedras coloradas batholith, libertador general san martín, San Luis province
title_fullStr Geology of the basement of the northeastern border of the las chacras-piedras coloradas batholith, libertador general san martín, San Luis province
title_full_unstemmed Geology of the basement of the northeastern border of the las chacras-piedras coloradas batholith, libertador general san martín, San Luis province
title_sort geology of the basement of the northeastern border of the las chacras-piedras coloradas batholith, libertador general san martín, san luis province
url http://hdl.handle.net/20.500.12110/paper_00044822_v72_n4_p563_Martinez
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AT montenegrot geologyofthebasementofthenortheasternborderofthelaschacraspiedrascoloradasbatholithlibertadorgeneralsanmartinsanluisprovince
AT higal geologyofthebasementofthenortheasternborderofthelaschacraspiedrascoloradasbatholithlibertadorgeneralsanmartinsanluisprovince
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