Petrology and Facies Analysis of Turbiditic Sedimentary Rocks Of the Puncoviscana Trough (Upper Precambrian-Lower Cambrian) in The Basement Of The Nw Argentine Andes
- Garry D. Mckenzie
Published Online: 21 MAR 2013
Copyright 1987 by the American Geophysical Union.
Gondwana Six: Structure, Tectonics, and Geophysics
How to Cite
JežEk, P. and Miller, H. (1987) Petrology and Facies Analysis of Turbiditic Sedimentary Rocks Of the Puncoviscana Trough (Upper Precambrian-Lower Cambrian) in The Basement Of The Nw Argentine Andes, in Gondwana Six: Structure, Tectonics, and Geophysics (ed G. D. Mckenzie), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM040p0287
- Published Online: 21 MAR 2013
- Published Print: 1 JAN 1987
Print ISBN: 9780875900643
Online ISBN: 9781118664483
- Gondwana Geology)—Congresses;
The late Precambrian to Early Cambrian metagraywacke/metapelite sequence of the NW Argentine Andes (Puncoviscana Formation) and its higher-grade metamorphic equivalents are interpreted as mainly gravity current deposits of a large submarine fan system. The petrologic composition of 31 graywackes points to a recycled orogen provenance. The analysis of facies and paleocurrent directions indicates a westward prograding fan association upon a continuously subsiding inactive continental margin as the most appropriate model for the deposition of the Puncoviscana Formation and equivalent rocks. Intracontinental orogenic belts (Brazilides, about 650 Ma) in the interior of the Brazilian Shield are assumed to be the main source areas.