Petrogenesis and Crustmantle Mixing of Early Jurassic Granites in the Taipingling Mountains, Heilongjiang Province

Abstract

Abstract:

The Taipingling Mountains in Mudanjiang, Heilongjiang Province is an important component of the XinganMongolian Orogenic Belt. The granitic rocks are widely distributed in the area. Zircon SHRIMP U-Pb age of these granites ranges from 179 Ma to 204 Ma, which indicate that they formed in the Early Jurassic, rather than the Late Triassic by former traditional understanding. The main lithology of the batholith is granodiorite, which are abundant in finegrained dioritic enclaves. The finegrained dioritic enclaves are rarely found in the monzonitic granite and syenogranite. The petrologic, petrographic and geochemical studies in this paper show that the Taipingling granites are generated by magma mixing of crustal and mantle materials. The Early Jurassic Taipingling granites have homogeneous Sr, Nd, and Pb isotopic compositions, with εNd(t)ranging from -3.2 to+2.3, and (87Sr/86Sr)i ranging from 0.704 to 0.706. This further suggests that the rocks are strongly mantlerelated. The granites show volcanic arc granite characteristics, which implies it is related to the environment dominated by compression. The origin of the Taipingling granites is tectonically linked to the subduction of the paleoPacific plate.

Key words: Taipingling Mountains, Early Jurassic, granite, dioritic enclave, paleoPacific plate, Heilongjiang

LV Chang-Lu, XU Dong-Hai, LI Xin-Feng, HAO Xin-Zhong. Petrogenesis and Crustmantle Mixing of Early Jurassic Granites in the Taipingling Mountains, Heilongjiang Province[J]. Geoscience, 2012, 26(4): 635-646.

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