34 Applications of Geochemistry and Geochronology to Understanding Tectonic Processes: In Honor of Raymond A. Coish (Posters)

Tuesday, 22 March 2016
8:00 AM - 12:00 PM
Convention Hall

THE CASE FOR LATE CRETACEOUS COMPRESSIONAL REJUVENATION IN EASTERN NORTH AMERICA

Paper number: 34-10
Program: Symposia Sessions
Time: 8:00 AM – 12:00 PM

Authors

Abstract

Although the eastern U.S. has been a passive margin for nearly 200 million years there is abundant evidence for tectonic rejuvenation during this post-rift period. Strong evidence for Mio-Plio-Pleistocene rejuvenation comes from steep river profiles, uplifted shorelines, and high relief. More subtle evidence for pre-Miocene episodes of rejuvenation comes from geologic mapping, tectonic fracturing, offshore sedimentation, basin inversion, and variations in apatite fission-track ages. This presentation will review evidence for a Late Cretaceous rejuvenation event in the eastern U.S. and compare it with evidence for tectonic rejuvenation along other circum-Atlantic margins at roughly the same time. We will show that many Atlantic margins experienced synchronous Late Cretaceous rejuvenation and will speculate on the origin of a widespread compressional stress regime from roughly 84-65 Ma.

Geological Society of America Abstracts with Programs. Vol. 48, No. 1

doi: 10.1130/abs/2016NE-272633

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