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Book Chapter

Stratigraphy, Sedimentology, and Paleontology

Published:
January 01, 2016

Abstract

The 26.9-Ma Creede caldera is a large resurgent ignimbrite-subsidence structure that hosts world-class epithermal Ag-Pb-Zn deposits set within the San Juan locus of the Southern Rocky Mountain volcanic field (SRMVF). This field guide reviews the understanding of the SRMVF and central San Juan magmatic locus and then provides a summary of the Oligocene Creede Formation, the caldera moat fill, and ancient Lake Creede, which occupied the caldera for ~100 k.y. after the caldera-forming eruption. The summary of the volcanic setting and Creede Formation provides a framework for discussing the hydrothermal system that deposited Ag-Pb-Zn ores in the Creede district ~1.8 m.y. after the caldera formed. This guide also highlights controversial aspects of the Lake Creede environment, such as the duration of the intracaldera sedimentation, proposed pseudomorphs after ikaite (CaCO3·6H2O) in the lake sediments and tufa, and the paleolimnology of ancient Lake Creede.

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GSA Field Guide

Unfolding the Geology of the West

Stephen M. Keller
Stephen M. Keller
Colorado Geological Survey Colorado School of Mines 1801 19th Street Golden, Colorado 80401, USA
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Matthew L. Morgan
Matthew L. Morgan
Colorado Geological Survey Colorado School of Mines 1801 19th Street Golden, Colorado 80401, USA
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Geological Society of America
Volume
44
ISBN print:
9780813756448
Publication date:
January 01, 2016

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