Genesis, Zircon U-Pb Geochronology and Geological Significance of Late Paleozoic Granite in Aquedun, West of East Kunlun Mountains
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摘要: 东昆仑西段阿确墩地区晚古生代花岗质岩体，主要分布在豹子沟一带，呈岩基状产出.岩石地球化学研究显示，其具有钙碱性、弱过铝质（A/CNK=0.99~1.04）特征；稀土元素球粒陨石标准化表现为轻稀土富集，重稀土亏损的特征，具弱负Eu异常，δEu为0.73~0.97；微量元素显示高场强元素Nb、Ta、Ti等亏损的特征，认为其形成于陆缘弧环境，属于I型花岗岩.运用LA-ICP-MS技术对该花岗质岩体进行锆石U-Pb测年，获得二长花岗岩年龄为281.5±4.0 Ma，表明其形成于早二叠世晚期.结合区域构造演化，表明特提斯洋于早二叠世晚期就已经开始向塔里木板块俯冲，该数据代表了目前已知最早的一期晚古生代-早中生代花岗岩浆活动时间，而此时的古特提斯洋处于伸展结束-俯冲开始转变时期.Abstract: The Late Paleozoic granitic rocks, which is batholith-like, in Aquedun, the west of East Kunlun mountains are mainly distributed in the area of Baozigou. The geochemical characteristics showed that it has calc-alkaline and weak peraluminous (A/CNK=0.99-1.04).The standardized distribution of chondrites of rare earth elements is steep on the left and slow on the right with negative Eu anomaly(δEu=0.73-0.97). Trace elements show losses of high-field strength elements such as Nb, Ta and Ti, which are believed to be formed in the continental margin arc environment and belong to the I-type granite. By the technique of LA-ICP-MS, zircon U-Pb dating of the granitic rock shows that the age of the monzonitic granite is 281.5±4.0 Ma. It is believed that the granite formed in the late of Early Permian. Combined with the regional tectonic evolution, it shows that the Paleotethys ocean began to subducting to the Tarim plate in the late of Early Permian, which may represent the earliest time of subduction, and the Paleotethys ocean was at the end of extension and the beginning of subduction transition.
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Key words:
- East Kunlun orogenic belt /
- monzonite granite /
- geochemistry /
- zircon U-Pb dating /
- Paleotethys ocean
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图 1 东昆仑造山带大地构造位置图（a）和区域地质简图（b）
NAT.北阿尔金俯冲增生带；NQL.北祁连俯冲增生带；CAB.中阿尔金地块；QLB.祁连地块; SAT.南阿尔金俯冲碰撞杂岩带；NQD.柴北缘俯冲碰撞杂岩带；NKT.昆北地体；SKT.昆南地体；ECKF.东昆中断裂；ESKF.东昆南断裂；WQF.温泉断裂；ATF.阿尔金断裂；据张建新等（2015）修改
Fig. 1. Simplified maps showing (a) the location of the East Kunlun Orogenic Belt in China, and (b) the geological map of the East Kunlun area
图 3 豹子沟岩体岩野外露头（a）和镜下特征（b）
Qz.石英；Bt.黑云母；Kfs.钾长石；Pl.斜长石
Fig. 3. Outcrops and microscopic characteristics of granite in Baozigou area
图 4 SiO2-(Na2O+K2O)图解(a)和A/CNK-A/NK图(b)
a.据Middlemost（1994）；b.据Peccerillo and Taylor（1976）
Fig. 4. SiO2-(Na2O+K2O) diagram (a) and A/CNK-A/NK diagram (b)
图 5 SiO2-K2O图解（a）和SiO2-（Na2O+K2O-CaO）图解（b）
a.据Rickwood（1989）；b.据Frost et al.（2001）
Fig. 5. SiO2-K2O diagram (a) and SiO2-(Na2O+K2O-CaO) diagram (b)
图 6 侵入岩稀土元素球粒陨石化配分模式(a)和微量元素原始地化幔蛛网图（b）
Fig. 6. Chondrite-normalized REE patterns (a) and primitive mantle-normalized spidergrams of trace elements(b)
图 9 岩石SiO2-P2O5图解（a）和Na2O-K2O图解（b）
a.据Chappell and White（1974）；b.据Collins et al.（1982）
Fig. 9. SiO2-P2O5 diagram (a) and Na2O-K2O diagram (b)
图 10 Nb+(Y-Rb)、Y-Nb图解
VAG.火山弧花岗岩；WPG.板内花岗岩；ORG.洋脊花岗岩；Syn-COLG.同碰撞花岗岩；Pearce et al.（1984）
Fig. 10. Nb+Y-Rb, Y-Nb diagram
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