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《Acta Geologica Sinica》 2003-02
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SHRIMP Dating of Carbpniferous Jinshajiang Ophiolite in Western Yunnan and Sichuan: Geochronological Constraints on the Evolution of the Paleo-Tethys Oceanic Crust

JIAN Ping, LIU Dunyi , SUN Xiaomeng Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037; Jiling University, Changchun, 130022  
SHRIMP (sensitive high resolution ion microprobe) zircon U-Pb ages of the Jinshajiang ophiolite, China, have resolved important geological problems. Dating of six samples of gabbro, anorthosite, granodiorite and plagiogranite occurring in the ophiolite along the Jinshajiang River provides geochronological constraints on the evolution of the Paleo-Tethys oceanic crust. In western Yunnan Province, the Zhiyong layered amphibole gabbro is dated at 328±8 Ma,the Susong anorthosite,329±7 Ma, and the Baimaxueshan gabbro, 282~285 Ma, which might reflect formation ages of the oceanic crust at spreading centers. The study also reveals a few older zircons of c. 375 to 352 Ma from the dated ophiolitic gabbros and anorthosite, indicating that the magmatic activity in this part of Paleo-Tethys ocean started in the late Devonian. In the Jinshajiang ophiolite, the Niangjiuding plagiogranite from Yunnan and the Xuetui plagiogranite from Sichuang are both characterized by high SiO2 and low K2O. However, the rocks have high total REE content, enriched in LREE with high initial 87Sr/86Sr about 0. 7058 ~ 0. 7070. Inherited zircons also indicate the presence of an older crust component. This evidence suggests that continental contamination was involved in the magma generation and evolution, probably related to the subduction of the ocean crust. The magmatic age of the Niangjiuding plagiogranite is 285 ± 6 Ma and that of the Xuetui plagiogranite is 300 ± 5 Ma, which recorded the subduction-related events. The Jiyidu granodiorite from western Yunnan Province intruded into the ophiolite at 263 ?6 Ma, which gives the youngest possible age of the ophiolitic complex.
【Fund】: 国家自然科学基金(编号49902005)
【CateGory Index】: P597
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