THE CHARACTERISTICS OF KUDI OPHIOLITE SUITE AND ITS TECTONIC SETTING
Yang Shufeng1, Chen Hanlin1, Dong Chuanwan1, Shen Xiaohua1, Qi Dewen1, Zhao Dongdong1, Jia Chengzao2, Wei Guoqi2, Li Jiliang
1. Department of Earth Sciences, Zhejiang University, Hangzhou 310027; 2. Headuarters of Tarim Petroleum Exploration and Development, Kuerle 841000; 3. Institute of Geology, Chinese Academy of Sciences, Beijing 100029
Kudi ophiolite suite is composed of ultramafic rocks, gabbro, mantle source granitoid, basic volcanic rocks and flysch. It was formed during Sinian and Cambrian. Through the research of mineralogy, petrology and geochemistry of gabbro and basalt, the authors concluded that characteristics of gabbro are similar to those of cumulate structural gabbro. The characteristics of basalt are similar to those of ocean ridge basalt. Therefore, Kudi ophiolite suite is a typical ophiolite suite formed in ocean ridge. Combining the characteristics of Kudi island-arc granitoid, the authors also suggest that there had been a wide ocean lying to the south of Tarim basin during Sinian and Early Paleozoic, and this wide ocean was closed at the end of Silurian.