Petrogenesis of Isla Tortuga and its correlation with sills in the Guaymas Basin, Gulf of California: Insights into a shared magmatic plumbing system
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1.
California Institute of Technology
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2.
California State University, Sacramento
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3.
University of Minnesota
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4.
International Ocean Discovery Program
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5.
Forschungszentrum Jülich
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6.
Center for Scientific Research and Higher Education at Ensenada
Abstract
Isla Tortuga (IT) is a volcanic island in the Guaymas Basin (GB), formed by extensional tectonics in the Gulf of California (Mexico). It records two stages of basaltic volcanism, with older lavas in the south and younger ones in the north. The most recent eruption formed a lava lake in the central crater [1], but radiometric ages
remain unknown. IODP Exp. 385 recovered four kilometers of core from eight GB sites, revealing sills intruding Quaternary sediments [2]. These sills share petrographic and geochemical features with IT volcanic rocks. This study presents a comparative analysis of the petrography and geochemistry of the drilled sills and IT volcanic units and reports new radiometric ages for two IT samples.
Acknowledgement
We would like to thank Adoniya Paul, Anna Piland, Lila Rodriguez, and Oliver Wilner for helping with the sample preparation and analysis of trace elements. We would also like to thank to GSA for the Graduate Research Grant awarded to A. Piña that partially funded this project. Much appreciation to Caltech FSRI for partially funding this project.
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Additional details
- Geological Society of America
- California Institute of Technology
- First-Year Success Research Institute (FSRI) -
- Caltech groups
- Seismological Laboratory, Division of Geological and Planetary Sciences (GPS)