Pulling apart the mid to late Cenozoic magmatic record of the Gulf of California : is there a Comondú arc?

Bryan, Scott Edward, Orozco-Esquivel, Teresa, Ferrari, Luca, & Lopez-Martinez, Margarita (2013) Pulling apart the mid to late Cenozoic magmatic record of the Gulf of California : is there a Comondú arc? Orogenic Andesites and Crustal Growth, 385.

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The composition of the lithosphere can be fundamentally altered by long-lived subduction processes such that subduction-modified lithosphere can survive for 100's Myrs. Incorrect petrotectonic interpretations result when spatial-temporal-compositional trends of, and source contributions to, magmatism are not properly considered. Western Mexico has had protracted Cenozoic magmatism developed mostly in-board of active oceanic plate subduction beneath western North America. A broad range of igneous compositions from basalt to high-silica rhyolite were erupted with intermediate to silicic compositions in particular, showing calc-alkaline and other typical subduction-related geochemical signatures. A major Oligocene rhyolitic ignimbrite “flare-up” (>300,000 km3) switched to a bimodal volcanic phase in the Early Miocene (~100,000 km3), associated with distributed extension and opening of numerous grabens. Extension became more focussed ~18 Ma resulting in localised volcanic activity along the future site of the Gulf of California. This localised volcanism (known as the Comondú “arc”) was dominantly effusive and andesite-dacite in composition. Past tectonic interpretations of Comondú-age volcanism may have been incorrect as these regional temporal-compositional changes are alternatively interpreted as a result of increased mixing of mantle-derived basaltic and crust-derived rhyolitic magmas in an active rift environment rather than fluid flux melting of the mantle wedge above the subducting Guadalupe Plate.

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ID Code: 58549
Item Type: Journal Article
Refereed: Yes
Additional URLs:
Keywords: 040313, 040304, 040303, 040314
DOI: 10.1144/SP385.8
Divisions: Current > Schools > School of Earth, Environmental & Biological Sciences
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2013 Geological Society of London
Deposited On: 22 Mar 2013 00:40
Last Modified: 16 Jan 2014 20:55

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