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Geochemistry of calc-alkaline lavas from the Acatlan volcanic field in the western Mexican volcanic belt, Jalisco, Mexico



Geochemistry of calc-alkaline lavas from the Acatlan volcanic field in the western Mexican volcanic belt, Jalisco, Mexico



Abstracts with Programs - Geological Society of America 31(7): 353



The Acatlan Volcanic Field is located in a complex tectonic setting in the Western Mexican Volcanic Belt, about 25 km SW of Guadalajara. Calc-alkaline lavas erupted about 1 million years ago (+ or -0.4) along NNW trending lineaments associated with the Zacoalco half-graben, which is part of the NW arm of the triple junction in this region. Samples of basaltic andesite and andesite lava flows, rhyolite domes, and pumice fragments from the Acatlan ignimbrite (compositionally zoned from a rhyolitic base to an andesitic top) have been collected and are being analyzed for major and trace elements by XRF and ICP-MS. Preliminary results show that the basaltic andesites are only very slightly LREE enriched, and that LREE and LILE are only slightly enriched over HFSE. Sr/Zr ratios range from 3-5, La/Nb ratios are about 1. 3, and Ba/La ratios range from 25-30. The geochemical signature of these lavas appears to be intermediate between that of intraplate tholeiites and that of subduction-related lavas.

Accession: 019007300

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