The study of EarlyPaleozoic peraluminous granite(SP) and its tectonic significance in the Xingxingxia suture zone| eastern Tianshan Mountains|Xinjiang|northwest China
Mao Qigui1|2 Xiao Wenjiao1 Han Chunming1 Fang Tonghui2 Sun Min3 Yuan Chao4
(1.State Key Laboratory of Lithospheric Evolution|Institute of Geology and Geophysics|Chinese Academy of Sciences|Beijing 100029； 2.Beijing Institute of Geology for Mineral Resources|Beijing 100012; 3.Department of Earth Science|The University of Hong Kong,Pokfulam Road, Hong Kong； 4.Institute of Geochemistry|Chinese Academy of Sciences|Guangzhou 510640)
The Qianluzi granite intruded along the Xingxingxia fault at the south margin of the central Tianshan Mountains. The granite is characterized by high absolute Si，Al and K，whereas low Mg，Fe contents，K2O>Na2O，A/CNK>11，is high K calcalkaline peraluminous granite(SP). The rocks also are characterized by relatively low CaO/Na2O（006～007）and Al2O3/TiO2（489～553）ratios； high REE，Nb and Y abundance，enriched LREE and LILE(Rb，U，Th，K)； strongly depleted Ba，Sr P，Ti，Eu and HREE； relatively high zircon Hf isotopic(εHf(t)=-23～＋16）。These characters indicate the Qianluzi granite is the postcollision granite； the source rocks are mudrocks which are the mixtures matters that origin from the whethering of the growth crust and the old crust； is recycle of the accretionary crust. In the postcollision strikeextension setting，the mantle raised along the fault and lead partialmelting of the mud rocks. The Zircon UPb dating by LAICPMS shows that its crystallization age is 4445±22〖KG*3〗Ma，in the late Ordovician，limits the collision time of the central Tianshan tarrane and the Gongpoquan arc. Summary，the Qianluzi peraluminous granite(SP)is the result of the collision between the central Tianshan terrane and the Gongpoquan Tarrane，and is the one of the results of the crustal growth in the Central Asian Orogeny Belt.
. The study of EarlyPaleozoic peraluminous granite(SP) and its tectonic significance in the Xingxingxia suture zone| eastern Tianshan Mountains|Xinjiang|northwest China[J]. Chinese Journal of Geology, 2010, 45(01): 41-056.