Overview: Ancient Lake Creede

GSA Special Papers
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Lake Creede was moderately saline closed-basin lake that developed in the 26.9 Ma Creede caldera in the San Juan Mountains in the southwest Colorado. The volcaniclastic sediments deposited within the late Oligocene lake were first described and named as the Creede Formation by Emmons and Larsen (1923). The lake and its sedimentary fill are of interest first as representatives of a caldera-hosted lake in a silicic volcanic terrane, and second because of the likely involvement of lake fluids or related pore waters in the deposition of the 25 Ma silver and base-metal ores of the Creede mining district north of the Creede caldera (Fig. 1), as proposed Bethke and Rye (1979). Much of the material presented in this volume is based on observation of core samples and on downhole geophysical measurements obtained as part of a U.S. Continental Scientific Drilling Program in the moat of the Creede caldera. These core and downhole studies are supplemented by outcrop studies, some initiated in support of the drilling program (Bethke and Lipman, 1987), and by conceptual studies of the evolution of the Creede caldera and its surrounding landscape. Not surprisingly, not all authors agree on all interpretation. Most disagreements are pointed out in this overview chapter, and may present opportunities for future study.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Overview: Ancient Lake Creede
Series title GSA Special Papers
DOI 10.1130/0-8137-2346-9.1
Volume 346
Year Published 2000
Language English
Publisher Geological Society of America
Description 8 p.
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title GSA Special Papers
First page 1
Last page 8
Country United States
State Colorado
Other Geospatial Creede Mining District
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