Petrogenesis and tectonic implication of Yaolesayi granite in North Altyn-Tagh: Constraints from the zircon U-Pb ages and geochemistry
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摘要: 尧勒萨依花岗岩出露于阿尔金北缘西段尧勒萨依河下游至河口一带，岩性为黑云二长花岗岩。为确定尧勒萨依花岗岩形成时代、成因和构造环境，本文从岩石学、锆石U-Pb年代学和地球化学方面进行研究。通过LA-ICP-MS锆石U-Pb定年，显示年龄为240±2 Ma，形成时代为中生代早期晚三叠世。其高硅（SiO2=69.68%～70.64%）、富碱（Na2O+K2O）=9.61%～9.87%，里特曼指数σ=3.34～3.63，呈碱性；铝饱和指数（A/CNK）=0.73～0.80，属准铝质；大离子亲石元素U、Th、K、Rb等相对富集，高场强元素Ti、P、Ta、Nb等相对亏损；稀土含量较高，相对富集轻稀土且分馏明显，（La/Yb） N=79.80～88.40，Eu弱亏损（δEu=0.79～0.85）。根据岩体成因类型及区域构造演化特征，认为尧勒萨依花岗岩为壳幔混合的Ⅰ型花岗岩，形成于阿尔金断裂走滑局部应力释放的伸展环境。
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关键词:
- 岩石地球化学 /
- LA-ICP-MS锆石U-Pb年代学 /
- Ⅰ型花岗岩 /
- 阿尔金北缘 /
- 晚三叠世
Abstract: The granite distributed in midstream of the Yaolesayi River, the western part of North Altyn-Tagh, is mainly composed of biotite monzonitic granite. In order to find out the origin, formation age and tectonic setting of intrusive rocks in this area, studies of petrology, zircon U-Pb chronology and geochemistry were carried out. LA-ICP-MS U-Pb dating obtains the age of 240±2 Ma, corresponding to Late Triassic period of Early Mesozoic. We have learnt that the granite in research area is rich in silicon(SiO2=69.68%~70.64%) and alkali(Na2O+K2O)=9.61%~9.87%. The Rittman index of the granite is 3.34~3.63, which shows a characteristic of alkaline series. The aluminum oversaturated index (A/CNK) is 0.73~0.80, which is a metaluminous series. The granite is rich in LILEs such as U, Th, K and Rb and depleted in HFSEs such as Ti, P, Ta and Nb. The granite is also characterized by high SREE, LREE enrichment, notable light and heavy REE fractionation(La/Yb) N=79.80~88.40 and negative Eu anomaly(δEu=0.79~0.85). These characteristics suggest that the granite in research area is Ⅰ-type granite with a crust-mantle mixing origin. According to the regional geological data, it is considered that the Yaolesayi granite was formed in the extensional environment of local stress release of the Altyn fault. -
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