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How old are these rocks, how were they made, and how long ago did these geologic changes happen?
Date:3/20/2012

Boulder, CO, USA - New GSA BULLETIN science published online 9-20 March includes studies in the western Aleutians, south-central Alaska, Canada, Iceland, the Southern Pyrenees, and the western Gulf of Mexico. Topics cover the crystallization process of granophyre, marine outcrops in south-central Chile, characterizing the source and age of Wilcox Group sediments, sediments transported to the deep-sea trench, pieces of mid-oceanic ridge found above ground, and large wedges of crust added to the edges of existing continents.

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Geology and 40Ar/39Ar geochronology of the medium- to high-K Tanaga volcanic cluster, western Aleutians

Brian R. Jich
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Contact: Christa Stratton
cstratton@geosociety.org
Geological Society of America
Source:Eurekalert

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