Linking exhumation, paleo-relief, and rift formation to magmatic processes in the western Snake River Plain, Idaho, using apatite (U-Th)/He thermochronology

نویسندگان

چکیده

The western Snake River Plain (WSRP) in southwest Idaho has been characterized as an intracontinental rift basin but differs markedly topography and style from other Cordilleran extensional structures structurally the down-warped lava plain of eastern Plain. To investigate mechanisms driving extension topographic evolution, we sampled granitoid bedrock Cretaceous Eocene-aged plutons mountainous flanks WSRP to detail their exhumation history with apatite (U-Th)/He (AHe) thermochronometry. AHe cooling dates seventeen samples range 7.9 ± 1.4 Ma 55 10 Ma. Most adjacent are Eocene, while Eocene intrusions within Middle Fork Boise canyon ~35 km NE yield Miocene dates. provide evidence batholith during supporting a high relief landscape at that time, followed by decreasing relief. show rapid along take indicate focused river incision due base level fall WSRP. limit magnitudes on formation. This suggests was accommodated magmatic intrabasin faults rather than basin-bounding faults. We favor model where related Columbia Flood Basalt eruption enhanced later Bruneau-Jarbidge Twin Falls volcanic fields, explaining apparent difference structures.

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ژورنال

عنوان ژورنال: Geosphere

سال: 2022

ISSN: ['1553-040X']

DOI: https://doi.org/10.1130/ges02453.1