Geological Society of America

T279 Precambrian Linkages across Laurentia: Looking for Geological, Geophysical, and Paleogeographic Connections and Controversies Associated with the Growth and Tectonic Evolution of Laurentia from the Neoarchean to the Neoproterozoic (Posters)

Wednesday, 25 September 2019
9:00 AM - 6:30 PM
Hall AB, North Building

GEOCHEMICAL CONSTRAINTS ON THE PROVENANCE OF EDIACARAN–CAMBRIAN SEDIMENTARY ROCKS FROM THE SOUTHWESTERN MARGIN OF LAURENTIA

Paper number: T279-2
Program: Technical Sessions
Time: 9:00 AM – 6:30 PM

Authors

L.C. Webb Presenting Author
Johns Hopkins University, Baltimore, MD
Lyle L. Nelson
Johns Hopkins University, Baltimore, MD
E.B. Hodgin
Harvard University, Cambridge, MA
Emmy Smith
Johns Hopkins UniversityEarth & Planetary Sciences, Baltimore, MD

Abstract

The break-up of the supercontinent Rodinia is often mechanistically linked to coeval changes in Neoproterozoic–Cambrian life, climate, and surface conditions, yet the timing and nature of this tectonic evolution remain debated topics. Calibration of the rift to drift transition along the western (present-day coordinates) margin of Laurentia has remained particularly contentious with suggestions ranging over a hundred million years from the early Ediacaran to the middle Cambrian. This study aims to use geochemical data of fine grained clastic rocks from late Ediacaran–Cambrian stratigraphic sections in southwestern North America to understand temporal changes in sedimentary provenance that may be associated with the weathering of rift-related volcanic rocks along this margin.

Geological Society of America Abstracts with Programs. Vol. 51, No. 5

doi: 10.1130/abs/2019AM-335534

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