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Sm-Nd isotope study of early Archean rocks, Qianan, Hebei Province, ChinaThe geochronology of amphibolitic and gneiss rocks in the Qianan region in China is examined. Sm-Nd isotopic measurements were performed to determine if the rocks existed in the early Archean age. The average age for the amphibolite samples is 3.50 + or - 0.08 billion years with an initial epsilon(Nd) value of 3.3 + or - 0.3, and for the gneiss samples the average age is also 3.5 billion years. The high initial epsilon(Nd) value indicates that the mantle magma source is depleted of magmaphile elements and the geochemistry of the early Archean mantle is similar to the modern upper mantle.
Document ID
19860052407
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Huang, X.
(Chinese Academy of Sciences, Institute of Geology, Beijing, People's Republic of China; California, University Los Angeles, United States)
Bi, Z.
(Hebei Province Geological Survey, People's Republic of China, United States)
Depaolo, D. J.
(California, University Los Angeles, United States)
Date Acquired
August 12, 2013
Publication Date
April 1, 1986
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 50
ISSN: 0016-7037
Subject Category
Geophysics
Accession Number
86A37145
Funding Number(s)
CONTRACT_GRANT: NAG9-70
CONTRACT_GRANT: NSF EAR-82-12377
CONTRACT_GRANT: NSF EAR-84-15143
Distribution Limits
Public
Copyright
Other

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