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CENOzOIC DISPLACEMENT HISTOrY OF THE ALTYN TAGH FAULT:geological EVIDENCE FrOM FIELD OBSErVATIONS IN SOUErKULI AND MANGAr rEGIONS, NW CHINA

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地学前缘 2000年第S1期7卷 210-211页

作者： zhang Yueqiao 1, chen {2. 1, z.washburn 2. wang xiaofeng 1, j. r.arrowsmith 2.1.the institute of geomechanics, chinese academy of geological sciences, beijing 100081, China 2.Department of Geology, Arizona State University, Tempe, Az, 852.7,USA

The ENE\|striking Altyn Tagh Fault (ATF) has been well known as a large, active left\|lateral strike\|slip fault that bounds the thrusting systems in NE *** fault has been the focal point in the debate between the discrete extrusion vs. distributed crustal shortening models. Although its active left\|lateralstrike\|slip features have been largely investigated and well documented by both satellite imagery and air\|photo interpretations and field observations, little study has been done upon its Cenozoic displacement history. Questions about the age of initiation and total offset accumulated on the fault remain controversial. A key area to resolve such question is located along the central segment of the fault in the Souerkuli and Mangar regions, where Neogene sedimentary basins well develop and are mostly distributed in three zones, namely from east to west: the Gobiling, Yitunbulak and Yusuale Tagh (Fig.1.. Our field investigations were conducted along the ATF cutting the Yitunbulak and Gebiling Neogene sedimentary basins. Two stratigraphic unconformities observed within this Neogene conglomeratic series allow a separation of three maj.r stratigraphic sequences and record the initiation and maj.r deformational episodes of ATF during Cenozoic. An early stratigraphic unconformity occurred between a yellow depositional series below and early Pliocene red\|colored conglomeratic mudstones above. A later stratigraphic unconformities occurred between early and late Pliocene sedimentary series. The lower series below the early stratigraphic unconformities is mainly composed of a conglomeratic rocks containing cobbles and pebbles of basement rock units (mostly mylonitic granites, limestones and quartzes); this series has been poorly mapped and dated; its age could be assigned to late Oligocene to early Miocene; this series tilts to NW with an angle of about 30° and is overlain in angular unconformity by early Pliocene pebble\|sized conglomerates. A weathering zone on

关键词： left\|lateral offset Cenozoic Altyn Tagh fault

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SEDIMENTArY PrOCESS OF THE CENOzOIC BASIN AND ITS rESPONSE TO THE SLIP-HISTOrY OF THE ALTYN TAGH FAULT, NW CHINA

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地学前缘 2000年第S1期7卷 245-246页

作者： chen zhengle 1, {2. Yueqiao 1, chen Xuanhua 1,wang xiaofeng 1, z.washburn 2.j.arrowsmith 2.WT5,5”BX](1 The institute of geomechanics, chinese academy of geological sciences, beijing 100081,China 2.Department of Geology, Arizona State Unive

The NEE\|striking Altyn Tagh Fault (ATF) has been well known as one maj.r point to know the growth history of the Tibetan plateau. Lots of investigations done since 1.70’s were mostly focus on active features, particularly on determining slip, slip rate and their distribution along the fault. However, Cenozoic slip\|history of this fault remains poorly understood, and the age of initiation and total offset are controversial. Several Cenozoic sedimentary basins develop in Suo’erkulinan to Mangya regions (Fig.1.. Their sedimentary processes are closely related with the ATF. The studies of the Neogene sedimentary sequences and the reconstruction of the paleo\|geography are essential to establish the displacement history of the fault during Late *** at the southern side of the ATF, the Suo’erkulinan basin consists of more than 600\|meter\|thick Pliocene Shizigou Formation below and about {2.\|meter\|thick Early to Middle Pleistocene Qigequan Formation above according to the 1.2.0000 {1. map by Xinj.ang Province. An obvious erosional surface can be seen on the top of the lower sequence. Sediments in the Shizigou Formation are characterized by 400\|meter\|thick yellow to red cobble\|sized conglomerates in the bottom, up\|grading to sandstones and grey\|green mudstones. This indicated that the sedimentary facies changed from alluvial fan to fluvial fan and sediments became more and more mature. The upper sequence, the Qigequan Formation, corresponds to an alluvial facies series composed of yellow to white cobble\|sized conglomerates intercalated with lenticular sandstones. Paleo\|current indicators showed that the Shizhigou conglomeratic series were sourced from northwest. Well\|developed syn\|sedimentary faults, normal faults mostly inherited from syn\|sedimentary faults, and some striation lineations on the surface indicated transtensional tectonic environment of the strike\|slip faulting.

关键词： Altyn Tagh fault Cenozoic basins sedimentary process slip\| history reconstruction of the paleo\|geography

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