Abstract Soft sediment deformation structures were found by detailed observations of six wells' cores in the Miocene Keziloyi Formation and Anju'an Formation in the Yecheng sag of the West Kunlun Mountain piedmont,the southwestern margin of the Tarim Basin. These structures include liquefied sand veins,load and ball-and-pillow structures,injection structures,liquefied curl deformations,soft mud thixotropic deformations,liquefied diapirs,soft boudinages and syndepositional micro-faults,which were distributed widely and recurred. Compared with typical seismites,they are all sedimentary structures of seismic origin. Seismites in the Keziluoyi Formation and Anju'an Formation can be divided into four developing periods,which spans about 5 Ma(16-11 Ma). The first and second phases have a long time and strong tectonic activities,and the third and fourth phases have a short time and weak tectonic activities. This is the first discovery of seismites in the Neogene continental strata in the southwestern Tarim Basin. The development of these seismites is related to the periodic seismic activities that have been caused by the episodic uplift of the west Kunlun Mountains and the activities of multiple thrust faults in the frontal thrust belt of the west Kunlun Mountains in the Miocene.
Fund:Financially supported by the project of Tarim Petroleum Exploration and Development Research Institute(No.D257)
Corresponding Authors:
Lu Ting-Qing,born in 1963,is an associate professor of Southwest Petroleum University. He is mainly engaged in teaching and researches on palaeontology and stratigraphy,sedimentology and ichnology. E-mail: lutingqing@swpu.edu.cn.
About author: Chen Quan-Jun,born in 1995,a master degree candidate of Southwest Petroleum University,is mainly engaged in sedimentology. E-mail: 1296643495@qq.com.
Cite this article:
Chen Quan-Jun,Lu Ting-Qing,Li Shuang et al. Seismites in the Miocene at Tarim Basin Yecheng sag of West Kunlun Mountain piedmont and its geological significance[J]. JOPC, 2021, 23(1): 142-152.
Chen Quan-Jun,Lu Ting-Qing,Li Shuang et al. Seismites in the Miocene at Tarim Basin Yecheng sag of West Kunlun Mountain piedmont and its geological significance[J]. JOPC, 2021, 23(1): 142-152.
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