Skip to Main Content
Skip Nav Destination
GEOREF RECORD

A geologic and anthropogenic journey from the Precambrian to the new energy economy through the San Juan volcanic field

Douglas B. Yager, Alison Burchell and Raymond H. Johnson
A geologic and anthropogenic journey from the Precambrian to the new energy economy through the San Juan volcanic field (in Through the generations; geologic and anthropogenic field excursions in the Rocky Mountains from modern to ancient, Lisa A. Morgan (editor) and Steven L. Quane (editor))
Field Guide (Geological Society of America) (2010) 18: 193-237

Abstract

The San Juan volcanic field comprises 25,000 km (super 2) of intermediate composition mid-Tertiary volcanic rocks and dacitic to rhyolitic calderas including the San Juan-Uncompahgre and La Garita caldera-forming super-volcanoes. The region is famous for the geological, ecological, hydrological, archeological, and climatological diversity. These characteristics supported ancestral Puebloan populations. The area is also important for its mineral wealth that once fueled local economic vitality. Today, mitigating and/or investigating the impacts of mining and establishing the region as a climate base station are the focuses of ongoing research. Studies include advanced water treatment, the acid neutralizing capacity (ANC) of propylitic bedrock for use in mine-lands cleanup, and the use of soil amendments including biochar from beetle-kill pines. Biochar aids soil productivity and revegetation by incorporation into soils to improve moisture retention, reduce erosion, and support the natural terrestrial carbon sequestration (NTS) potential of volcanic soils to help offset atmospheric CO (sub 2) emissions. This field trip will examine the volcano-tectonic and cultural history of the San Juan volcanic field as well as its geologic structures, economic mineral deposits and impacts, recent mitigation measures, and associated climate research. Field trip stops will include a visit to (1) the Summitville Superfund site to explore quartz alunite-Au mineralization, and associated alteration and new water-quality mitigation strategies; (2) the historic Creede epithermal-polymetallic-vein district with remarkably preserved resurgent calderas, keystone-graben, and moat sediments; (3) the historic mining town of Silverton located in the nested San Juan-Silverton caldera complex that exhibits base-metal Au-Ag mineralization; and (4) the site of ANC and NTS studies. En route back to Denver, we will traverse Grand Mesa, a high NTS area with Neogene basalt-derived soils and will enjoy a soak in the geothermal waters of the Aspen anomaly at Glenwood Springs.


ISSN: 2333-0937
EISSN: 2333-0945
Serial Title: Field Guide (Geological Society of America)
Serial Volume: 18
Title: A geologic and anthropogenic journey from the Precambrian to the new energy economy through the San Juan volcanic field
Title: Through the generations; geologic and anthropogenic field excursions in the Rocky Mountains from modern to ancient
Author(s): Yager, Douglas B.Burchell, AlisonJohnson, Raymond H.
Author(s): Morgan, Lisa A.editor
Author(s): Quane, Steven L.editor
Affiliation: U. S. Geological Survey, Denver, CO, United States
Affiliation: U. S. Geological Survey, Denver, CO, United States
Pages: 193-237
Published: 2010
Text Language: English
Publisher: Geological Society of America, Boulder, CO, United States
ISBN: 978-0-8137-0018-2
References: 133
Accession Number: 2011-056922
Categories: Areal geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables, sketch maps
N37°30'00" - N39°00'00", W109°00'00" - W106°00'00"
Secondary Affiliation: Quest University Canada, CAN, Canada
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201132
Program Name: USGSOPNon-USGS publications with USGS authors
Close Modal

or Create an Account

Close Modal
Close Modal