An ancient linked fluid migration system: cold-seep deposits and sandstone intrusions in the Panoche Hills, California, USA |
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| Authors: | Hilde Schwartz James Sample Kevin D Weberling Daniel Minisini J Casey Moore |
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| Institution: | (1) Earth Sciences Department, University of California Santa Cruz, Santa Cruz, California 95064, USA;(2) Department of Geology, Northern Arizona University, P.O. Box 4099, Flagstaff, Arizona 86011, USA;(3) ExxonMobil Exploration Company, 233 Benmar Drive, Houston, Texas 77060, USA;(4) Dipartimento Scienze della Terra e Geologico-Ambientale, Universita di Bologna, Via Zamboni 67, 40126 Bologna, Italy |
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| Abstract: | In central California, Maastrichtian–Danian shales of the Moreno Formation preserve a fluid migration system that developed along the western margin of the former Great Valley forearc basin. The system consists of a network of interconnected sandstone intrusions linked to overlying fossiliferous carbonates whose geochemistry, fauna, and petrology are characteristic of active cold seeps. The system is approximately 800 m thick and represents episodic migration and seafloor expulsion of fluids over at least 0.5×106 years. This locality has the most extensive exposure yet discovered of a complete seep system, from underlying fluid pathways to seep deposits and associated communities. |
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