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Nd isotopic composition of cratonic rocks in the southern Death Valley region; evidence for a substantial Archean source component in Mojavia

O. Tapani Ramo and James P. Calzia
Nd isotopic composition of cratonic rocks in the southern Death Valley region; evidence for a substantial Archean source component in Mojavia
Geology (Boulder) (October 1998) 26 (10): 891-894

Abstract

Thirty Early Proterozoic intermediate to silicic metasedimentary and metaigneous rocks in the southern Death Valley region and vicinity show epsilon (sub Nd) values of -1.6 to -6.3 at 1.7 Ga and Nd model ages of 2.1 to 2.6 Ga. These cratonic rocks thus reveal an older signature than so far reported for Nd province 1 of the western United States; as much as 30%-40% of their mass may be Archean crustal material. The Archean component was introduced in the form of sedimentary detritus that was probably subducted and mixed with juvenile material at a convergent margin. Three younger Precambrian rocks associated with the cratonic rocks also have a Nd isotopic composition of province 1 type.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 26
Serial Issue: 10
Title: Nd isotopic composition of cratonic rocks in the southern Death Valley region; evidence for a substantial Archean source component in Mojavia
Affiliation: University of Helsinki, Department of Geology, Helsinki, Finland
Pages: 891-894
Published: 199810
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 26
Accession Number: 1998-070322
Categories: Isotope geochemistryIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 9884
Illustration Description: illus. incl. 1 table, geol. sketch map
N35°30'00" - N36°30'00", W117°00'00" - W115°30'00"
Secondary Affiliation: U. S. Geological Survey, Menlo Park, CA, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 199824
Program Name: USGSOPNon-USGS publications with USGS authors
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