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Source region of a granite batholith: evidence from lower crustal xenoliths and inherited accessory minerals

Published online by Cambridge University Press:  03 November 2011

Calvin F. Miller ,
John M. Hanchar ,
Joseph L. Wooden ,
Victoria C. Bennett ,
T. Mark Harrison ,
David A. Wark  and
David A. Foster
Calvin F. Miller
Affiliation:
Calvin F. Miller, Department of Geology, Vanderbilt University, Nashville, TN 37235, U.S.A.
John M. Hanchar
Affiliation:
John M. Hanchar, Department of Geology, Vanderbilt University, Nashville, TN37235, U.S.A.
Joseph L. Wooden
Affiliation:
Joseph L. Wooden, U.S. Geological Survey, Menlo Park, CA 94025, U.S.A.
Victoria C. Bennett
Affiliation:
Victoria C. Bennett, Research School of Earth Sciences, Australian National University, Carberra, ACT 2601, Australia.
T. Mark Harrison
Affiliation:
T. Mark Harrison, Department of Earth and Space Sciences, University of California, Los Angeles, CA 90024, U.S.A.
David A. Wark
Affiliation:
David A. Wark, Department of Earth and Environmental Sciences, Rensselaer Polytechnic Institute, Troy, NY 12180-3590, U.S.A.
David A. Foster
Affiliation:
David A. Foster, Department of Geological Sciences, State University of New York, Albany, NY 12222, U.S.A.
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Abstract

Like many granites, the Late Cretaceous intrusives of the eastern Mojave Desert, California, have heretofore provided useful but poorly focused images of their source regions. New studies of lower crustal xenoliths and inherited accessory minerals are sharpening these images.

Xenoliths in Tertiary dykes in this region are the residues of an extensive partial melting event. Great diversity in their composition reflects initial heterogeneity (both igneous and sedimentary protoliths) and varying amounts of melt extraction (from <10% to >70%). Mineral assemblages and thermobarometry suggest that the melting event occurred at T ≥ 750°C at a depth of about 40 km. Present-day Sr, Nd, and Pb isotopic ratios indicate a Mojave Proterozoic heritage, but unrealistic model ages demonstrate the late Phanerozoic adjustment of parent/daughter ratios. A link between these xenoliths and the Late Cretaceous granites, though not fully documented, is probable; in any case, they provide invaluable clues concerning a crustal melting event, recording information about nature of source material (heterogeneous, supracrustal-rich), conditions of melting (moderately deep, moderately high T, accompanied by partial dehydration), and melt extraction (highly variable, locally extensive).

The Old Woman-Piute granites contain a large fraction of inherited zircon and monazite. A SHRIMP ion probe investigation shows that these zircons record a Proterozoic history similar to that which affected the Mojave region. Zonation patterns in zircons, and to a lesser extent monazites and xenotimes, document multiple phases of igneous, metamorphic, and sedimentary growth and degradation, commonly several in a single grain. Low Y in portions of the cores of inherited zircons and monazites and in monazites and outer portions of zircons from the xenoliths appear to indicate growth in equilibrium with abundant garnet.

Keywords

granitexenolithaccessory mineralszirconmonaziteanatexisMojave DesertCalifornia
Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 83 , Issue 1-2: Second Hutton Symposium: The Origin of Granites and Related Rocks , 1992 , pp. 49 - 62
Copyright
Copyright © Royal Society of Edinburgh 1992

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