Polyphase white mica growth in low-grade metapelites from La Cébila Metamorphic Complex (Famatinian Belt, Argentina): evidence from microstructural and XRD investigations

Two tectono-thermal metamorphic events, M1-D1 (S1, with associated white mica and chlorite: WM1-Chl1) and M2-D2 (S2, with development of WM2-Chl2), are established from polyphase white mica growth for low-grade units from the Ordovician metasedimentary successions of La Cébila Metamorphic Complex in...

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Autores principales:	Verdecchia,Sebastián O, Collo,Gilda, Baldo,Edgardo G
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2011
Materias:	Sierras Pampeanas Low pressure Kübler index White mica b parameter
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062011000200002
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spelling	oai:scielo:S0718-710620110002000022011-09-28Polyphase white mica growth in low-grade metapelites from La Cébila Metamorphic Complex (Famatinian Belt, Argentina): evidence from microstructural and XRD investigationsVerdecchia,Sebastián OCollo,GildaBaldo,Edgardo G Sierras Pampeanas Low pressure Kübler index White mica b parameter Two tectono-thermal metamorphic events, M1-D1 (S1, with associated white mica and chlorite: WM1-Chl1) and M2-D2 (S2, with development of WM2-Chl2), are established from polyphase white mica growth for low-grade units from the Ordovician metasedimentary successions of La Cébila Metamorphic Complex in the Famatinian belt (western-central Argentina). The thermobarometric characterization of the M1 main event was carried out by means of clay-mineral analysis and crystallo-chemical parameter measurements. Epizonal (temperatures between 300 and 400°C) and low-pressure conditions are suggested for M1 event, based in Kübler index values ranging from 0.23 to 0.17 A°20, white mica b parameter values between 9.004 and 9.022 Á (mean of 9.014 Á, n=16) and Si contents between 3.13-3.29 a.p.f.u. Temperatures of ~180-270°C are estimated for the M2 event, with Kübler index values ranging from 0.31 to 0.46 A°20. The M1-D1 event of La Cébila could be linked to high-strain heating tectono-metamorphic Ordovician regime recorded in others complexes from Famatinian foreland region of Sierras Pampeanas.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.38 n.2 20112011-07-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062011000200002en
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Sierras Pampeanas Low pressure Kübler index White mica b parameter
spellingShingle	Sierras Pampeanas Low pressure Kübler index White mica b parameter Verdecchia,Sebastián O Collo,Gilda Baldo,Edgardo G Polyphase white mica growth in low-grade metapelites from La Cébila Metamorphic Complex (Famatinian Belt, Argentina): evidence from microstructural and XRD investigations
description	Two tectono-thermal metamorphic events, M1-D1 (S1, with associated white mica and chlorite: WM1-Chl1) and M2-D2 (S2, with development of WM2-Chl2), are established from polyphase white mica growth for low-grade units from the Ordovician metasedimentary successions of La Cébila Metamorphic Complex in the Famatinian belt (western-central Argentina). The thermobarometric characterization of the M1 main event was carried out by means of clay-mineral analysis and crystallo-chemical parameter measurements. Epizonal (temperatures between 300 and 400°C) and low-pressure conditions are suggested for M1 event, based in Kübler index values ranging from 0.23 to 0.17 A°20, white mica b parameter values between 9.004 and 9.022 Á (mean of 9.014 Á, n=16) and Si contents between 3.13-3.29 a.p.f.u. Temperatures of ~180-270°C are estimated for the M2 event, with Kübler index values ranging from 0.31 to 0.46 A°20. The M1-D1 event of La Cébila could be linked to high-strain heating tectono-metamorphic Ordovician regime recorded in others complexes from Famatinian foreland region of Sierras Pampeanas.
author	Verdecchia,Sebastián O Collo,Gilda Baldo,Edgardo G
author_facet	Verdecchia,Sebastián O Collo,Gilda Baldo,Edgardo G
author_sort	Verdecchia,Sebastián O
title	Polyphase white mica growth in low-grade metapelites from La Cébila Metamorphic Complex (Famatinian Belt, Argentina): evidence from microstructural and XRD investigations
title_short	Polyphase white mica growth in low-grade metapelites from La Cébila Metamorphic Complex (Famatinian Belt, Argentina): evidence from microstructural and XRD investigations
title_full	Polyphase white mica growth in low-grade metapelites from La Cébila Metamorphic Complex (Famatinian Belt, Argentina): evidence from microstructural and XRD investigations
title_fullStr	Polyphase white mica growth in low-grade metapelites from La Cébila Metamorphic Complex (Famatinian Belt, Argentina): evidence from microstructural and XRD investigations
title_full_unstemmed	Polyphase white mica growth in low-grade metapelites from La Cébila Metamorphic Complex (Famatinian Belt, Argentina): evidence from microstructural and XRD investigations
title_sort	polyphase white mica growth in low-grade metapelites from la cébila metamorphic complex (famatinian belt, argentina): evidence from microstructural and xrd investigations
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2011
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062011000200002
work_keys_str_mv	AT verdecchiasebastiano polyphasewhitemicagrowthinlowgrademetapelitesfromlacebilametamorphiccomplexfamatinianbeltargentinaevidencefrommicrostructuralandxrdinvestigations AT collogilda polyphasewhitemicagrowthinlowgrademetapelitesfromlacebilametamorphiccomplexfamatinianbeltargentinaevidencefrommicrostructuralandxrdinvestigations AT baldoedgardog polyphasewhitemicagrowthinlowgrademetapelitesfromlacebilametamorphiccomplexfamatinianbeltargentinaevidencefrommicrostructuralandxrdinvestigations
_version_	1714205832146583552

Polyphase white mica growth in low-grade metapelites from La Cébila Metamorphic Complex (Famatinian Belt, Argentina): evidence from microstructural and XRD investigations

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