Oil & Gas Geology ›› 2006, Vol. 27 ›› Issue (2): 159-166.doi: 10.11743/ogg20060204

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Sedimentary tectonic features of Ordos basin in Middle Jurassic Zhiluo-Anding stages

Zhao Junfeng, Liu Chiyang, Yu Lin, Liang Jiwei, Huang Lei   

  1. Northwest University, Xi'an, Shaanxi, 710069
  • Received:2005-12-30 Online:2006-04-25 Published:2012-01-16

Abstract:

Along with the breakup of Grand North China basin in Middle Jurassic Zhiluo-Anding ages,the Zhiluo-Anding Fms were relatively completely preserved in Ordos basin,with many scattered and contemporaneously correlated strata occurring in adjacent areas.In present Ordos basin,the Zhiluo Formation is dominated by fluvial deposits,while the Anding Formation is dominated by fluvial and lacustrine sediments deposited in arid climate.The lacustrine sediments in Zhiluo-Anding Fms were mainly deposited in the palaeo-depocenter in the southeastern part of the basin,while its accumulation center was located along Wuhai-Otog QiangqiPingliang in the western part of the basin,deviating from the depocenter.The palaeotectonic framework prior to deposition of Zhiluo Fm was characterized by being high in the south and low in the north,as well as high in the east and low in the west.The palaeogeologic features in Zhiluo-Anding ages were characterized by being high in the northwest and low in the southeast,with very slight south-north differentiation.Based on comprehensive analyses of the lithology and lithofacies of equivalent layers and the timing of present tectonic units in the adjacent areas,it is believed that the primary basin in Zhiluo-Anding ages extended to the west of Helan mountain in the west,reached somewhere between east of Luliang mountain and west of Taihang mountain in the east,and was bounded by Daqing mountain in the north and Qinling mountain in the south.

Key words: sedimentary facies, palaeo-geologic structure, Zhiluo-Anding ages, Ordos basin

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