Geological Society of America

T173 Assembling Laurentia: Neoproterozoic to Cambrian Rifting and Continental Margin Evolution during Breakup of Rodinia and Pannotia

Thursday, 29 October 2020
10:00 AM - 12:00 PM
Meeting Rooms

CRYOGENIAN RIFTING IN DEATH VALLEY, CALIFORNIA (USA)

Paper number: T173-2
Program: Technical Sessions
Time: 10:05 AM – 10:20 AM

Authors

Lyle L. Nelson Presenting Author
Johns Hopkins University, Baltimore, MD
Emily F. Smith
Johns Hopkins University, Baltimore, MD
Eben B. Hodgin
Harvard University, Cambridge, MA
James L. Crowley
Boise State University, Boise, ID
Mark Schmitz
Boise State University, Boise, ID
Francis Macdonald
University of California, Santa Barbara, Santa Barbara, CA

Abstract

Death Valley (California, USA) hosts iconic stratigraphic records of Neoproterozoic rifting and Cryogenian snowball Earth glaciations, but the lack of direct geochronological constraints has permitted a variety of correlations and age models. Here, we report two precise zircon U-Pb isotope dilution–thermal ionization mass spectrometry dates for the Kingston Peak Formation, which demonstrate correlations to the Sturtian and Marinoan glaciations and contribute to the global calibration of their respective durations. When integrated with stratigraphic data sets from across the region, these dates calibrate the development of overlapping unconformities through episodic and spatially variable structural uplift and exhumation. This constrains intervals of local rift-related tectonism, magmatism, and subsidence that can be compared to the broadly coeval records of supercontinent break-up along the western Laurentian margin.

Geological Society of America Abstracts with Programs. Vol. 52, No. 6

doi: 10.1130/abs/2020AM-357709

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