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Stratigraphy and geochronology of the Nacientes del Teno and Río Damas Formations: Insights into Middle to Late Jurassic Andean volcanism

2019; Geological Society of America; Volume: 15; Issue: 2 Linguagem: Inglês

10.1130/ges01698.1

1553-040X

William Junkin, Phillip B. Gans,

earthquake and tectonic studies

Revised stratigraphy and new U-Pb geochronological data are reported for the Nacientes del Teno Formation and lowermost strata of the Río Damas Formation in Maule, Chile (∼35.15°S), a succession of sedimentary and volcanic rocks deposited along the western margin of the Neuquén backarc basin during the Middle to Late Jurassic (174–145 Ma). These results provide insights into the location, composition, and timing of coeval arc volcanic systems, and thus represent an important contribution to our understanding of the tectonostratigraphic evolution of the Andean orogen.