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FCGS Newsletter - December 2024

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FCGS Newsletter - December 2024

Author FCGS Editorial Board

Newsletter Summary

The Dec. 3 meeting features Logan Powell of Metallic Minerals on the La Plata alkaline porphyry complex. Mr. Powell discusses how Farallon flat slab subduction relates to Arizona porphyry systems and alkaline magmatism, using new geochemistry from the Allard stock to illuminate this unusual igneous complex. Dr. Gonzales’ “Prez Sez” column examines the Oligocene (32–30 Ma) San Juan Formation volcanism, its thick strato-volcanic deposits, inherited zircons, paleo- valley infill, major unconformities, and evidence challenging a proposed La Plata stratovolcano.

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The Four Corners Geological Society promotes geological science and professional excellence since 1950.

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Four Corners Geological Society

Four Corners Geological Society

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Durango, CO 81302

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