Petrogenesis of Early Neogene Magmatism in the Northern Puna; Implications for Magma Genesis and Crustal Processes in the Central Andean Plateau期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Petrogenesis of Early Neogene Magmatism in the Northern Puna; Implications for Magma Genesis and Crustal Processes in the Central Andean Plateau

Authors:	CAFFE, PABLO J. TRUMBULL, ROBERT B. COIRA, BEATRIZ L. ROMER, ROLF L.

Affiliation:	¹INSTITUTO DE GEOLOGÍA Y MINERÍA, UNIVERSIDAD NACIONAL DE JUJUY-CONICET, AVDA. BOLIVIA 1661, SAN SALVADOR DE JUJUY, ARGENTINA ²GEOFORSCHUNGSZENTRUM-POTSDAM, TELEGRAFENBERG 14473, POTSDAM, GERMANY

Abstract:	New compositional data and petrogenetic models are presentedfor pre-Upper Miocene volcanism in the northern Puna of Argentina(22°S24°S). Two phases of volcanism producedsmall dome complexes of mainly silicic andesite to low-SiO₂rhyolite. The Upper OligoceneLower Miocene phase (UOLM,2017 Ma), produced two distinct groups of rocks. TheUOLM-1 group is metaluminous and mainly andesitic, with isotopiccompositions like those of the recent arc (⁸⁷Sr/⁸⁶Sr_T

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