The determination of early Cretaceous post-collision granitoids in Sangba area of Gangdese tectonic belt and its tectonic significance
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P588.12+ 1; P542

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    Abstract:

    Sangba granitoids are exposed near Sangba and Jianduo areas to the north of Jiali fault in Gangdese tectonic belt. The main rock types include granitite, porphyritic granitite and porphyritic granodiorite. The SHRIMP UPb dating results of zircons from porphyritic granodiorite (TW1530) and granitite (TW1637) are 117.2±1.6 Ma and 121.2±1.7 Ma, respectively, suggesting that Sangba granitoids were formed in early Cretaceous. Sangba granitoids belong to high K and calcalkalic rocks. According to geochemistry and the trace element discrimination diagrams for tectonic interpretation, the early Cretaceous granitoids are considered to be of the postcollision type formed in a transitional tectonic setting from the compressional system to the tensional system. The appearance of the early Cretaceous Sangba granitoids marked the end of the main orogenicevent in BangonghuNujiang suture. From early Cretaceous, Gangdese tectonic belt entered the tensional stage until the deposition of Jingzhushan Formation inlate Cretaceous.

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和钟铧,杨德明,王天武,2006,冈底斯带桑巴区早白垩世后碰撞花岗岩类的确定及构造意义[J].岩石矿物学杂志,25(3):185~193. HE Zhong-hua, YANG De-ming, WANG Tian-wu,2006,The determination of early Cretaceous post-collision granitoids in Sangba area of Gangdese tectonic belt and its tectonic significance[J]. Acta Petrologica et Mineralogica,25(3):185~193.

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  • Received:July 08,2005
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