Amy K. Gilmer

Geosciences and Environmental Change Science Center

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Ren A. Thompson

United States Geological Survey

Ian Hillenbrand

United States Geological Survey

Peter W. Lipman

United States Geological Survey

Karl E. Karlstrom

University of New Mexico

Michael L. Williams

University of Massachusetts Amherst

Michael J. Jercinovic

University of Massachusetts Amherst

A. Kate Souders

United States Geological Survey

Marine Foucher

New Mexico Highlands University

Michael Petronis

New Mexico Highlands University

Filip Tomek

Charles University

Cooperative Institutions

United States Geological Survey

Denver Federal Center

Geosciences and Environmental Change Science Center

University of Bristol

Pacific Island Ecosystems Research Center

Entertainment Industries Council

University of Massachusetts Amherst

United States Department of the Interior

Geology, Geophysics, and Geochemistry Science Center

University of Oregon

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PETROCHRONOLOGIC CONSTRAINTS ON FOUR TECTONO-METAMORPHIC EVENTS IN WESTERN COLORADO

Abstracts with programs - Geological Society of America (2023)

Ian Hillenbrand Michael Williams Michael Williams Karl E. Karlstrom Karl E. Karlstrom

10.1130/abs/2023rm-387822

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Supporting information files: Protracted multipulse emplacement of a post-resurgent pluton: the case of Platoro caldera complex (Southern Rocky Mountain volcanic field, Colorado)

Figshare (2019)

Filip Tomek Amy K. Gilmer Michael Petronis Peter W. Lipman Marine Foucher

This file contains data tables of the sensitive high resolution ion microprobe with reversed geometry (SHRIMP-RG) U-Pb zircon dating, and anisotropy of magnetic susceptibility (AMS) analyses.

Caldera

10.6084/m9.figshare.9790700

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EMPLACEMENT STYLE OF A POST-CALDERA INTRUSION: INSIGHTS FROM STRUCTURE AND MAGNETIC ANISOTROPY OF THE ALAMOSA RIVER PLUTON (SOUTHERN ROCKY MOUNTAIN VOLCANIC FIELD, COLORADO)

Abstracts with programs - Geological Society of America (2018)

Filip Tomek Michael Petronis Michael Petronis Amy K. Gilmer Amy K. Gilmer

Caldera

10.1130/abs/2018rm-314137

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Early incubation and prolonged maturation of large ignimbrite magma bodies: Evidence from the Southern Rocky Mountain volcanic field, Colorado, USA

Geology (2022)

Peter W. Lipman Matthew J. Zimmerer Amy K. Gilmer

Abstract Clusters of early central volcanoes in the mid-Cenozoic Southern Rocky Mountain volcanic field (SRMVF; southwestern Colorado, USA) record sites of initial magmatic focusing that led to assembly of sizable upper-crustal magma bodies capable of generating large ignimbrites. Peak growth at precursor andesitic volcanoes was followed by extended periods (0.5 to >2 m.y.) of reduced eruptive activity during inferred prolonged incubation of the crustal reservoir prior to eruption of ignimbrites at the San Juan magmatic locus, as exemplified by the 5000 km3 Fish Canyon Tuff and associated La Garita caldera. After a magma system became thermally mature and compositionally evolved, additional large ignimbrites could erupt more rapidly from polycyclic calderas. In contrast, incubation times for smaller ignimbrite magmas, as at Crater Lake, Oregon, were briefer than for San Juan systems. Plutonic counterparts to the temporal-compositional assembly of arc-ignimbrite magmas are exemplified by incrementally emplaced granitoid intrusions like the Mesozoic Tuolumne complex in the Sierra Nevada.

Caldera

Magma chamber

10.1130/g49964.1

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Generation of porphyry copper deposits by gas–brine reaction in volcanic arcs

Nature Geoscience (2015)

Jon Blundy John Mavrogenes Brian Tattitch R. S. J. Sparks Amy K. Gilmer

Magma chamber

Magmatic water

10.1038/ngeo2351

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Citations (169)

Geochemical and geochronologic evidence for a contiguous northeastern Wyoming Province

Precambrian Research (2024)

Ian Hillenbrand Amy K. Gilmer A. Kate Souders Ilya N. Bindeman

Geochronology

10.1016/j.precamres.2024.107419

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CRUSTAL THICKNESS EVOLUTION OF SOUTHERN LAURENTIA'S PROTEROZOIC OROGENS

Abstracts with programs - Geological Society of America (2022)

Ian Hillenbrand Karl E. Karlstrom Michael L. Williams Amy K. Gilmer

Laurentia

10.1130/abs/2022nc-375129

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Supporting infromation files: Protracted multipulse emplacement of a post-resurgent pluton: the case of Platoro caldera complex (Southern Rocky Mountain volcanic field, Colorado)

Figshare (2019)

Filip Tomek Amy K. Gilmer Michael Petronis Peter W. Lipman Marine Foucher

This supporting information file contains data tables of the sensitive high resolution ion microprobe with reversed geometry (SHRIMP-RG) U-Pb zircon dating and anisotropy ofmagnetic susceptibility (AMS) analyses. We also present igures showing the Summitville Andesite and Chiquito Peak Tuff microstructure, and spatial distribution of AMS parametersin the Alamosa River pluton and its host rocks.

Caldera

10.6084/m9.figshare.10242938

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SEAMLESS, INTEGRATED DIGITAL GEOLOGIC MAP FOR THE INTERMOUNTAIN WEST

Abstracts with programs - Geological Society of America (2024)

Katherine Alexander Amy K. Gilmer Kenzie Turner

Geologic map

10.1130/abs/2024am-402299

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Protracted Multipulse Emplacement of a Postresurgent Pluton: The Case of Platoro Caldera Complex (Southern Rocky Mountain Volcanic Field, Colorado)

Geochemistry Geophysics Geosystems (2019)

Filip Tomek Amy K. Gilmer Michael Petronis Peter W. Lipman Marine Foucher

Abstract Many eroded calderas expose associated postcollapse plutons, but detailed fieldwork‐supported studies have rarely focused on the internal structure that can contribute to understanding of emplacement dynamics. The Alamosa River monzonite pluton is a postcollapse intrusion at the Platoro caldera complex that erupted six large ignimbrites between 30.2 and 28.8 Ma in the Southern Rocky Mountains volcanic field. Magnetic fabrics in this intrusion indicate the pulsed emplacement of a vertically extensive pluton. The magmatic pulses are documented by three concentric domains of magnetic foliations elongated in ~NE‐SW direction, corresponding to structural trends at the Platoro caldera complex and preexisting regional structures. As no evidence for deformation of wall rocks and the adjacent resurgent block has been identified, we interpret the Alamosa River pluton as a postresurgent intrusion. The space‐opening process involved magmatic stoping and small‐scale magma wedging. New SHRIMP‐RG U/Pb zircon dates (28.98 ± 0.18, 27.42 ± 0.35, and 27.32 ± 0.38 Ma) suggest a magmatic lifespan of ~1.7 My for the Alamosa River pluton. Our results indicate that postcaldera magmatism includes pulsed and protracted activity from large intracaldera resurgent plutons to smaller postresurgent stocks and sheeted complexes. As demonstrated by the Alamosa River pluton, some intrusions are emplaced shortly after collapse and resurgence, but postcaldera volcano‐plutonic systems may remain active for several million years or more. We also suggest that subvolcanic magma bodies may be assembled incrementally and that the record of early composite magma lenses preserved as magma wedges are later obliterated by convective flowage and crystallization.

Caldera

Sill

Dike

Magma chamber

10.1029/2019gc008477

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Citations (5)