Palaeosalinity characteristics and its sedimentary response to the Cenozoic salt-water lacustrine deposition in Qaidam Basin
Chen Nenggui1, Wang Yanqing1, Xu Feng2, Yang Tiyuan2, Xia Zhiyuan1
1 PetroChina Hangzhou Research Institute of Geology,Hangzhou 310023,Zhejiang 2 Qinghai Oilfield Research Institute of Exploration and Development,PetroChina,Dunhuang 736202,Gansu
Abstract：The salt￣water lacustrine deposition was developed during the Cenozoic in Qaidam Basin,but its salinity and sedimentary response have not been known. Based on boron and clay mineral data,palaeosalinities of the Cenozoic in Qaidam Basin were reconstructed by Couch formula,which testified that: (1) The Cenozoic sediments belonged to the salt￣water lacustrine deposition with the maximum salinity over 20‰. (2) The zones with different palaeosalinities had different sedimentary responses,that is,the palaeosalinity values of terrigenous clastics supplying areas were commonly less than 12‰,while those of shore-shallow lake ranged from 10‰ to 18‰,and those of semi-deep lake exceeded 18‰. Under the control of salt￣water with middle to high salinity, the salt water lacustrine deposition in Qaidam Basin has the following characteristics: single layer is thin usually with 1-3 m thickness, sand layer and mud layer are frequently interbedded, delta sedimentary facies belt is relatively narrow, fine grained sediments are distributed in a wide range, and typical lacustrine carbonate rocks, gypsum and terrestrial fine detritus are mixed.
Chen Nenggui,Wang Yanqing,Xu Feng et al. Palaeosalinity characteristics and its sedimentary response to the Cenozoic salt-water lacustrine deposition in Qaidam Basin[J]. JOPC, 2015, 17(3): 371-380.
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