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Aoyitake plagiogranite in western Tarim Block, NW china: Age, {1., petrogenesis and its tectonic implications

Science china Earth {1. 2006年第11期49卷 1121-1134页

作者： zhang chuanlin1,2. yu {3. ye {2. zhao yu2.& zhang dongsheng4 1. Key laboratory of isotope geochronology and {13., guangzhou Institute of {13., chinese academy of sciences, guangzhou 510640, china 2. Nanjing Institute of Geology and Mineral Resources, Nanjing 2.0016, china 3. Tianjin Institute of Geology and Mineral Resources, Tianjin 3.0170, china 4. The 2.d Regional Geological Investigation Party, Xinjiang Bureau of Geology and Mineral Resources, Changji 83.100, china 1. Key laboratory of {1. {{3. and geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China 2. Nanjing Institute of Geology and Mineral Resources Nanjing 210016 China 3. Tianjin Institute of Geology and Mineral Resources Tianjin 300170 China 4. The 2.d Regional Geological Investigation Party Xinjiang Bureau of Geology and Mineral Resources Changji 831100 China

SHRIMPP U-Pb zircon age and geochemical and Nd isotopic data are reported for the Aoyitake plagiogranite in western Tarim Block, NW china. The plagiogranite intruded the Middle Pro- terozoic and Lower Carboniferous with an exposure area of ca. 60 km{1.and crystallized at 3.0.7±4.8 Ma. Rock types mainly include tonalite, trondhjemite and minor amounts of diorite and quartz-diorite. Feldspars in the rocks are dominated by oligoclase-andesine, and minor perthite observed locally. The granites are sodic with Na/K ratios (molar) between 4 and 87. Total REE (50-{1.0 ppm) show a clear positive correlation with SiO{1. There is no LRRE/HREE fractionation (LaN/YbN=0.5-1.5), me- dium negative Eu anomalies (δ Eu=0.3.0.6), high Y content and low Sr/Y ratio (~1.0). These granites exhibit relatively juvenile Nd T{1.M model ages of 470 to 580 Ma and positive εNd(3.1.Ma) values of 6.{1. to 7.65. The aforementioned characteristics are similar to those of ocean island or ocean ridge plagiogranites. However, the regional geology, especially its scale, precludes that the plagiogranite pluton was derived directly from fractionational crystallization of mantle-derived basaltic magma. We interpreted that the primary magma of the pluton might be tonalitic in composition generated by ca. 50% partial melting of the juvenile basaltic crust. The primary magma experienced intensive frac- tionational crystallization, and intruded into the middle to upper crusts to form the granite pluton. In combination with the previous regional geological data, it is concluded that the plagiogranite pluton was emplaced within the Tarim Block in respond to the Carboniferous continental rifting along the Tianshan orogenic belt.

关键词： western Tarim, Aoyitake plagiogranite, age, geochemistry, tectonic implications.

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