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(U-Th)/He, U/Pb, and Radiation Damage Dating of the Rochechouart-Chassenon Impact Structure, France


Abstract It has been hypothesized that the ~25 km Rochechouart-Chassenon impact structure (RCIS) in the NW Massif Central, France, was formed during a Late Triassic (ca. 214 Ma) terrestrial impact event that produced a catena of several large craters. Testing this hypothesis, and assessing its possible impacts on biological evolution, requires both accurate and precise dating of candidate impact structures. Like many of these structures, the age of the RCIS is controversial because geochronological datasets yield contradictory results, even when a single isotopic system is used; for example, the two most recent 40Ar/39Ar studies of RCIS yielded statistically inconsistent dates of 201 ± 2 Ma (2σ) and 214 ± 8 Ma (2σ). While the precision offered by v... (more)
Created Date 2016
Contributor Horne, Audrey (Author) / Hodges, Kip V. (Advisor) / van Soest, Matthijs (Committee member) / Wittmann, Axel (Committee member) / Arizona State University (Publisher)
Subject Geochemistry / geochronology / impact crater / radiation damage / Rochechouart / thermochronology
Type Masters Thesis
Extent 70 pages
Language English
Copyright
Reuse Permissions All Rights Reserved
Note Masters Thesis Geological Sciences 2016
Collaborating Institutions Graduate College / ASU Library
Additional Formats MODS / OAI Dublin Core / RIS


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Description Dissertation/Thesis