Evidence for large departures from lithostatic pressure during Late Cretaceous metamorphism in the northern Snake Range metamorphic core complex, Nevada

C. Hoiland; J. Hourigan; E. Miller

doi:10.1130/2021.2555(07)

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GSA Special Papers

Tectonic Evolution of the Sevier-Laramide Hinterland, Thrust Belt, and Foreland, and Postorogenic Slab Rollback (180–20 Ma)

Editor(s)

Geological Society of America

Volume

555

DOI:

https://doi.org/10.1130/SPE555

ISBN electronic:

9780813795553

ISBN print:

9780813725550

Publication date:

May 03, 2022

This Special Paper focuses on the evolution of the crust of the hinterland of the orogen during the orogenic cycle, and describes the evolution of the crust and basins at metamorphic core complexes. The volume includes a regional study of the Sevier-Laramide orogens in the Wyoming province, a regional seismic study, strain analysis of Sevier and Laramide deformation, and detrital zircon provenance from the Pacific Coast to the foreland between the Jurassic and the Eocene.

Book Chapter

Evidence for large departures from lithostatic pressure during Late Cretaceous metamorphism in the northern Snake Range metamorphic core complex, Nevada

Author(s)

C. Hoiland

Department of Geological Sciences, Stanford University, Stanford, California 94305, USA

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;

J. Hourigan

Department of Earth and Planetary Sciences, University of California–Santa Cruz, Santa Cruz, California 95064, USA

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;

E. Miller

Department of Geological Sciences, Stanford University, Stanford, California 94305, USA

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Doi:

https://doi.org/10.1130/2021.2555(07)

Published:

May 03, 2022

ABSTRACT

The highest-grade Barrovian-type metamorphic rocks of the North American Cordillera exposed today are Late Cretaceous in age and found within an orogen-parallel belt of metamorphic core complexes for which the tectonic histories remain controversial. Thermobarometric studies indicate that many of these Late Cretaceous metamorphic assemblages formed at pressures of >8 kbar, conventionally interpreted as >30 km depth by assuming lithostatic conditions. However, in the northern Basin and Range Province, detailed structural reconstructions and a growing body of contradictory geologic data in and around the metamorphic core complexes indicate these metamorphic rocks are unlikely to have ever been buried any...

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Tectonic Evolution of the Sevier-Laramide Hinterland, Thrust Belt, and Foreland, and Postorogenic Slab Rollback (180–20 Ma)

Evidence for large departures from lithostatic pressure during Late Cretaceous metamorphism in the northern Snake Range metamorphic core complex, Nevada

ABSTRACT

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