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A Jurassic peraluminous leucogranite from Yiwulüshan, western Liaoning, North China craton: age, origin and tectonic significance

Published online by Cambridge University Press:  28 January 2008

XIAO-HUI ZHANG ,
QIAN MAO ,
HONG-FU ZHANG  and
SIMON A. WILDE
XIAO-HUI ZHANG*
Affiliation:
State Key Laboratory of Lithospheric Evolution and Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China Department of Applied Geology, Curtin University of Technology, Perth WA, Australia
QIAN MAO
Affiliation:
State Key Laboratory of Lithospheric Evolution and Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
HONG-FU ZHANG
Affiliation:
State Key Laboratory of Lithospheric Evolution and Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
SIMON A. WILDE
Affiliation:
Department of Applied Geology, Curtin University of Technology, Perth WA, Australia
*
‡Author for correspondence: [email protected]
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Abstract

The Gangjia granite stock is a garnet-bearing muscovite leucogranitic body emplaced in Yiwulüshan in Western Liaoning Province at the eastern segment of the Yanshan orogenic belt, North China craton. The SHRIMP U–Pb zircon age is 153±5 Ma. The Gangjia granites are peraluminous with A/CNK of more than 1.14, and exhibit a tetrad effect in their REE distribution patterns, as well as non-charge-and-radius-controlled trace element behaviour. This is in contrast to the LREE-enriched patterns of the host Lüshan monzogranites. These geochemical characteristics, together with low Th/U ratios in zircon, suggest that the parental magmas for the Gangjia granites have experienced extensive magmatic differentiation, including interaction between residual melt and a coexisting high-temperature aqueous fluid. Their similar ϵNd(t), model ages, compatible age patterns and common volcanic arc signature in source materials between the Gangjia granites and the host Lüshan monzogranites indicate their comagmatic relationship. These unusual peraluminous leucogranites, coupled with the voluminous adakitic granites hosting them, represent typical post-orogenic magmatism developed under an intra-continental extensional tectonic regime. At the very end of the prolonged Jurassic magmatic evolution in Western Liaoning, extensive fractionation of most probably ferromagnesian phases and plagioclase from a calc-alkaline magma parental to the host Lüshan pluton, with overprint of the magmatic hydrothermal fluid, produced highly evolved peraluminous parental magmas for the Gangjia granites.

Keywords

leucogranitegeochemistrypetrogenesisNorth China craton
Type
Original Article
Information
Geological Magazine , Volume 145 , Issue 3 , May 2008 , pp. 305 - 320
Copyright
Copyright © Cambridge University Press 2008

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