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2005 Geological Society of America. For permission to copy, contact Copyright Permissions, GSA, or editing@geosociety.org. Geology; January 2005; v. 33; no. 1; p. 5356; doi: 10.1130/G20831.1; 3 figures; Data Repository item 2005008. 53
 

Summary: 2005 Geological Society of America. For permission to copy, contact Copyright Permissions, GSA, or editing@geosociety.org.
Geology; January 2005; v. 33; no. 1; p. 5356; doi: 10.1130/G20831.1; 3 figures; Data Repository item 2005008. 53
Nd isotope disequilibrium during crustal anatexis: A record from
the Goat Ranch migmatite complex, southern Sierra Nevada
batholith, California
Lingsen Zeng*
Key Laboratory for Continental Dynamics, Ministry of Land and Resources, Institute of Geology,
Chinese Academy of Geological Sciences, Beijing, 100037, People's Republic of China
Jason B. Saleeby
Paul Asimow
Division of Geological and Planetary Sciences, California Institute of Technology, MS 100-23, Pasadena, California 91125, USA
ABSTRACT
Geological and geochemical studies of a pelitic migmatite complex within the Isabella
pendant of the southern Sierra Nevada batholith, California, suggest that the leucosomes
represent the products of partial melting of the metapelite host driven by the emplacement
of the adjacent Goat Ranch pluton ca. 100 Ma. The leucosomes preserve a record of large-
magnitude Nd isotope disequilibrium with respect to their pelitic source. The leucosomes
have a wide range of Nd(100 Ma) from 6.0 to 11.0, as compared to 8.7 to 11.3 for
the source. They can be subdivided into two groups based on their major elements and
Sr and Nd isotope geochemistry. Group I leucosomes have higher P2O5 contents and

  

Source: Asimow, Paul D. - Division of Geological and Planetary Sciences, California Institute of Technology,

 

Collections: Geosciences