Petrogenesis of the Linshu Monzonitic Granite in the Southern Part of the Sulu Orogen
DING Wei1, WANG Tao1,2, LI Yan-bo3, ZHANG Shuo1
1. Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation, Ministry of Land and Resource, Chengdu University of Technology, Chengdu 610059, China;
2. State Key Laboratory of Ore De-posit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;
3. No.5 Geological Party, Xizang Bureau of Geology and Mineral Resources, Golmud Qinghai 816000, China
Abstract：In order to discuss the age, type, source, tectonic environment and formation mechanism of the Linshu monzonitic granite pluton, which is tectonically occurred in the southern part of the Sulu orogenic belt, in Qingyun Town, Linshu County, the zircon U-Pb dating, petrology and elemental geochemistry of the rock have been undertaken in this study. The results show that the LA-ICP-MS zircon U-Pb age of the monzonitic granite is (126.6±3.8) Ma. The rocks are characterized with high Si, weak peraluminous, poor Fe and Mg, rich alkaline and high K, and low TFeO/MgO ratios. In addition, the rocks are depleted in HFSE including Nb, Ta, Ti, and P and relatively enriched in Pb and LILE including Rb, Th, K, and La, with highly differentiated REE distribution patterns which have moderate Eu negative anomalies (δEu=0.62-0.72). Therefore, it is believed that the rocks could be mainly derived from the partial melting of the lower crust of granulite facies under the moderate pressure (0.8-1.3 GPa), corresponding the depth of 35-45 km, in an extensional tectonic environment. In the diagenetic process, the mineral fractional crystallization could be occurred. The detachment of the lithosphere and the underplating of the mantle magma could be mainly resulted in the partial melting of the lower crustal material.
丁伟, 王涛, 李彦波, 张硕. 苏鲁造山带南缘临沭县二长花岗岩成因[J]. 矿物岩石地球化学通报, 2018, 37(2): 344-354.
DING Wei, WANG Tao, LI Yan-bo, ZHANG Shuo. Petrogenesis of the Linshu Monzonitic Granite in the Southern Part of the Sulu Orogen. Acta Metallurgica Sinica, 2018, 37(2): 344-354.
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