Lacustrine basin evolution and coal accumulation of the Middle Jurassic in the Saishiteng coal?eld, northern Qaidam Basin, China
Meng Lia,b, Long-Yi Shaoa,*, Lei Liua, Jing Lua, Baruch Spiroc, Huai-Jun Wend, Yong-Hong Lid
a College of Geosciences and Survey Engineering, China University of Mining and Technology, Beijing 100083, China; b Institute of Resources and Environment, Henan Polytechnic University, Jiaozuo 454000, China; c Department of Mineralogy, Natural History Museum, London, United Kingdom; d Qinghai Bureau of Coal Geological Exploration, Xining 810000, China
Based on an extensive borehole survey of the Middle Jurassic coal-bearing sequences in the Saishiteng coal?eld, northern Qaidam Basin (NQB), a total of 20 rock types and 5 sedimentary facies were identi?ed, including braided river, meandering river, braided delta, meandering river delta, and lacustrine facies. The distribution of rock types and sedimentary facies contributed to the reconstruction of three periods' sedimentary facies maps of the Middle Jurassic in the Saishiteng coal?eld, namely, the Dameigou age, the early Shimengou age and the late Shimengou age. That also provided the basis for the development of a three-stage depositional model of the Middle Jurassic in the NQB, indicating the lacustrine basin of the NQB in the Dameigou age and early Shimengou age were corresponding to an over?ll basin, and that in the late Shimengou age was related to a balanced-?ll basin. The analysis of the stability and structure of coal seams based on sedimentary facies maps showed that the preferred coal-forming facies in the Saishiteng coal?eld were inter-delta bay and interdistributary bay of lower delta plain in the Dameigou age. In particular, the swamps that developed on the subaqueous palaeohigh favored the development of thick coal seams. Thus, minable coal seams may also be found along the Pingtai palaeohigh in the western part of the Saishiteng coal?eld.
. Lacustrine basin evolution and coal accumulation of the Middle Jurassic in the Saishiteng coal?eld, northern Qaidam Basin, China[J]. Journal of Palaeogeography, 2016, 5(3): 205-220.
. Lacustrine basin evolution and coal accumulation of the Middle Jurassic in the Saishiteng coal?eld, northern Qaidam Basin, China[J]. Journal of Palaeogeography, 2016, 5(3): 205-220.
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2016, Vol. 5 
