Permian mantle-derived carbonatite originated exhalative sedimentary rocks in North Xinjiang
Liu Yi-Qun1, Zhou Ding-Wu2, Nan Yun1, Jiao Xin1, Li Zhe-Xuan1, Li Hong1, Zhou Xiao-Hu1
1 State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi'an 710069,Shaanxi; 2 College of Earth Science and Engineering,Shandong University of Science and Technology,Qingdao 266510,Shandong
Abstract：In the Permian Lucaogou epoch, an underfilled intracontinental rift basin was developed in the North Xinjiang, which yields an important source rock of the Lucaogou Formation. A new series of sedimentary rocks that are laminated, thin bedded, carbonate rick and mantle-derived were observed in the source rock and termed as Exhalative Sedimentary Rocks (ESR). The carbonatite ESR in this paper include two types, Effusive Rocks and Explosive Rocks. The thickness of carbonatite Explosive Rocks ranges from 0.5~4 cm. Fine-grained calcite clasts distribute dispersedly in black matrix with various sizes and shapes and display normal grading. The calcite carbonatite originated Effusive rocks are characterized by 2~4 mm laminae and 2~3 cm thin bed, and are intercalated within oil-bearing sedimentary tuffs and tuffaceous dolostones. The calcites represent granular mosaic and zonal structure; homogenization temperatures of fluid inclusions reaches to 435℃. C-O and Sr-Nd isotope compositions indicate the calcite in canbonatite ESR was originated from mantle yet has been largely influenced by interaction with lake water. This study shows that the carbonatite ESR are the product of interaction between mantle-derived carbonatite melt/fluid and fresh lake water.
Liu Yi-Qun,Zhou Ding-Wu,Nan Yun et al. Permian mantle-derived carbonatite originated exhalative sedimentary rocks in North Xinjiang[J]. JOPC, 2018, 20(1): 49-63.
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