Microstructural and geochemical analysis of paleoproterozoic pseudotachylytes in río de la plata craton, tandilia belt, argentina Report as inadecuate




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L.V. DIMIERI ; J.A. DRISTAS ; V. ARAUJO ; N. FORTUNATTI ;Geologica Acta: an international earth science journal 2012, 10 (2)

Author: M.C. FRISICALE

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Geologica Acta: an international earth science journal ISSN: 1695-6133 geologica-acta@ija.csic.es Universitat de Barcelona España FRISICALE, M.C.; DIMIERI, L.V.; DRISTAS, J.A.; ARAUJO, V.; FORTUNATTI, N. Microstructural and geochemical analysis of Paleoproterozoic pseudotachylytes in Río de la Plata craton, Tandilia belt, Argentina Geologica Acta: an international earth science journal, vol.
10, núm.
2, junio, 2012, pp.
85-101 Universitat de Barcelona Barcelona, España Available in: http:--www.redalyc.org-articulo.oa?id=50524522001 How to cite Complete issue More information about this article Journals homepage in redalyc.org Scientific Information System Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Non-profit academic project, developed under the open access initiative Geologica Acta, Vol.10, Nº 2, June 2012, 85-101 DOI: 10.1344-105.000001744 A v a i l a b l e o n l i n e a t w w w.
g e o l o g i c a - a c t a .
c o m Microstructural and geochemical analysis of Paleoproterozoic pseudotachylytes in Río de la Plata craton, Tandilia belt, Argentina M.C.
FRISICALE L.V.
DIMIERI J.A.
DRISTAS V.
ARAUJO N.
FORTUNATTI Ingeosur-Conicet-Departamento de Geología.
Universidad Nacional del Sur San Juan 670.
B8000ICN Bahía Blanca, Argentina.
Frisicale E-mail: cfrisica@uns.edu.ar.
Fax: 54 291 4595148 ABSTRACT The current study focuses on the analysis of pseudotachylytes from the Azul Megashear Zone, located in the Río de la Plata craton, central Argentina.
This shear zone is a strip of mylonitic rocks of more than 40km in length and with a maximum width of 2.5km.
Glassy and microcrystalline pseudotachylytes are hosted by Paleoproterozoic gneiss mylonite, granitoid mylonite, granulite mylonite and striped gneisses.
The pseudotachylytes occur as fault and injection veins characterized by sharp contacts with no gradation into the mylonites and show meltorigin features such as partially melted quartz and feldspar clasts wit...





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