U-Pb LA-ICP-MS GEOCHRONOLOGY AND REGIONAL CORRELATION OF MIDDLE JURASSIC INTRUSIVE ROCKS FROM THE GARZON MASSIF, UPPER MAGDALENA VALLEY AND CENTRAL CORDILLERA, SOUTHERN COLOMBIA
作者： Jeff Vervoort , Germán Bayona , George Gehrels , Andrés Mora , Camilo Bustamante
DOI:
关键词: Petrology 、 Subduction 、 Farallon Plate 、 Geochronology 、 Continental margin 、 Geochemistry 、 Magmatism 、 Massif 、 Geology 、 Back-arc basin 、 Zircon
摘要: New U-Pb zircon geochronology from four granitic units sampled along a southeast-northwest transect between the Garzon Massif and Serrania de las Minas (Central Cordillera), records Middle Jurassic magmatic activity with two different spatio-temporal domains at ca. 189 Ma 180-173 Ma. Reconnaissance data suggest that granitoids are characterized by mineralogical geochemical characteristics akin to continental arc setting. The new results southern Colombian margin includes remnants of tectono- elements formed subduction Farallon plate under South American margin. This magmatism is part broader Andean scale province, significant for understanding tectonic paleogeographic scenario Mesozoic evolution Northern Andes.
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