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Isotopic exchange and rates of exhumation and erosion from oxygen, argon, and helium isotopes of igneous and metamorphic rocks exhumed from very shallow and very deep crustal levels

English title Isotopic exchange and rates of exhumation and erosion from oxygen, argon, and helium isotopes of igneous and metamorphic rocks exhumed from very shallow and very deep crustal levels
Applicant Müntener Othmar
Number 117665
Funding scheme Project funding (Div. I-III)
Research institution Institut de Minéralogie et Géochimie Université de Lausanne
Institution of higher education University of Lausanne - LA
Main discipline Geochronology
Start/End 01.01.2008 - 30.04.2009
Approved amount 107'176.00
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All Disciplines (2)

Discipline
Geochronology
Geology

Keywords (7)

Ar/Ar geochronology; (U-Th)/He geochronology; exhumation; erosion; Sierra Nevada; helium; argon

Lay Summary (English)

Lead
Lay summary
Research is directed toward defining the timing of exhumation and tilting of the central Sierra Nevada, California. This information is important for testing models of regional tectonics that have direct implications for climate patterns in the past 10 million years. Additionally, this research is aimed at understanding the similarities and differences of the central Sierra Nevada to the southern Sierra, where models suggest that delamination of the subducting slab within the past few million years has locally led to aesthenospheric upwelling and melting of the overlying lithosphere, which has promoted a phase of accelerated exhumation. We are testing these ideas with a combination of detailed field mapping and sampling in the central Sierra Nevada and using a combination of geochemical and geochronological methods including Ar-Ar and (U-Th)/He techniques.
Direct link to Lay Summary Last update: 21.02.2013

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Associated projects

Number Title Start Funding scheme
105212 Dating structural fabric development using high spatial resolution 40Ar/39Ar geochronology: a Combined Filed and Experimental Approach 01.10.2004 Project funding (Div. I-III)

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