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 Located
in NW Argentina, the Sierras Pampeanas are a series of mountainous
ranges, comprising crystalline basement intruded by diverse Paleozoic
igneous rocks, that were elevated during Miocene to recent
compressional (Andean) tectonics. The granites were emplaced during
three main orogenic events: (a) Pampean (mid-Cambrian), (b) Famatinian
(Cambro-Ordovician), and (c) Achalian (Devonian-Carboniferous).
This collaborative project, with Pablo Alasino and Juan Dahlquist,
CONICET, focuses on the Achalian granitoids that outcrop in the
Pampean ranges. The study areas are the San Blas pluton of the Sierra
de Velasco, the Santa Rosa and Sauce Guacho plutons of the Sierra de
Ancasti, and the Achala batholith of the Sierra Grande de Cordoba. The
project is an integrated field and laboratory study that will include
geologic mapping, petrographic descriptions, major and trace element
rock chemistry, mineral chemistry, and geochronology. Results of the
study, as they become available, will be posted on this page. Photographs
of the field area, major lithologic units, and structural features are
found below.
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U. Mass Lowell
