Eocene-Oligocene Metamorphism, Fluid Flow and Deformation in the Ruby Mountains-East Humboldt Range Metamorphic Core Complex

Levy, Drew A.; Gordon, Stacia M.; Zuza, Andrew V.; Cisneros, Miguel; Kylander‐Clark, Andrew R. C.

doi:10.1029/2024tc008512

Eocene-Oligocene Metamorphism, Fluid Flow and Deformation in the Ruby Mountains-East Humboldt Range Metamorphic Core Complex

Journal Article · Fri Jan 03 00:00:00 EST 2025 · Tectonics

DOI:https://doi.org/10.1029/2024tc008512· OSTI ID:2511364

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Univ. of Nevada, Reno, NV (United States)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland)
Univ. of California, Santa Barbara, CA (United States)

Metamorphic core complexes are ubiquitous in collapsed orogens globally and play a primary role in crustal exhumation. Here, we investigate the metamorphic history of the Ruby Mountains-East Humboldt Range metamorphic core complex, Nevada, using petrochronology to understand how magmatism, metamorphism and deformation interact to modulate crustal rheology, and the timing of exhumation within the Sevier orogenic belt. Field study, microstructural analysis, thermobarometry and laser ablation split-stream monazite, titanite and allanite petrochronology of the mylonitic footwall were integrated to elucidate the pressure-temperature-time (P-T-t) evolution. Major-, trace-element and quartz-in-garnet thermobarometry show peak metamorphism occurred at 5.5–6 kbar and 600–650°C across the study area. Monazite and titanite U-(Th)-Pb petrochronology constrain this episode of metamorphism to 88–81 Ma with the structurally deepest samples yielding dates down to ca. 71 Ma. The preservation of peak metamorphic mineral assemblages indicates these rocks remained at near-peak temperature conditions into the Cenozoic. Cenozoic metamorphism occurred during a punctuated episode contemporaneous with the Great Basin ignimbrite flare up. All samples show a distinct 39–37 Ma population of monazite, titanite and allanite dates that correlate with the emplacement of quartz diorite and gabbro intrusions throughout the footwall. Accessory phases contain zoning textures in backscattered electron images that are consistent with fluid-mediated dissolution-reprecipitation reactions. The U-(Th)-Pb analyses from these zones yield 39–27 Ma dates interpreted as the timing of fluid flow. The results of this study elucidate the integrated importance of magmatism, melting and fluid flow in driving the coupled evolution of Late Cretaceous metamorphism within the Sevier hinterland and the subsequent Cenozoic metamorphic core complex development that exhumed the middle crust.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: US Geological Survey; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 2511364

Report Number(s):: LLNL--JRNL-865119; 1099214

Journal Information:: Tectonics, Journal Name: Tectonics Journal Issue: 1 Vol. 44; ISSN 0278-7407

Publisher:: Wiley/American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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Conference · Sun Feb 28 23:00:00 EST 1993 · Geological Society of America, Abstracts with Programs; (United States) · OSTI ID:5587905

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58 GEOSCIENCES

Eocene-Oligocene Metamorphism, Fluid Flow and Deformation in the Ruby Mountains-East Humboldt Range Metamorphic Core Complex

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