Paleoenvironmental model of La Flecha Formation (Upper Cambrian) from Jáchal region, San Juan province

En:

Rev. Asoc. Geol. Argent. 1996;51(2):165-176

Fecha:

1996

Formato:

application/pdf

Tipo de documento:

info:eu-repo/semantics/article
info:ar-repo/semantics/artículo
info:eu-repo/semantics/publishedVersion

Descriptores:

Cambrian -  carbonate platform -  facies distribution -  palaeoenvironment -  stromatolite -  thrombolite -  Brazil, San Juan

Descripción:

La Flecha Formation (Upper Cambrian) in Precordillera Central is composed of microbiolitic buildups, with a shallowing upward tendency. This paper includes the study of mega, meso and microstructure of thrombolites and stromatolites and the microfacial analysis of the muddy sequence. The following microbiolitic facies were recognized: F1: stratiform and domal stroms, with low synoptic relief, F2: stratiform thrombolites, F3: stratiform-domal thrombolites with low synoptic relief, F4: inverted cone-shaped thrombolites and F5: domal thrombolites. The associated muddy microfacies are represented by: MF6: mudstone with microbial lamination and fenestral fabric, MF7: mudstone with grumous microestructure, MF8: bioturbed mudstone and MF9: floatstone, related to storms. The depositional model of this sequence was interpreted as a carbonatic platform with a complex of non-emergent microbialitic mounds and ponds with restricted circulation.
Fil:Armella, C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fil:Cabaleri, N. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fil:Valencio, S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.

Identificador(es):

http://hdl.handle.net/20.500.12110/paper_00044822_v51_n2_p165_Armella

Derechos:

info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/2.5/ar