Oil & Gas Geology ›› 2015, Vol. 36 ›› Issue (4): 534-544.doi: 10.11743/ogg20150402

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Jurassic-Neogene conglomerate characteristics in Kuqa Depression and their response to tectonic uplifting of Tianshan Mountains

Gao Zhiyong1,2, Zhu Rukai1,2, Feng Jiarui1,2, Li Xiaopei3, Zhao Xuesong3, Guo Meili3   

  1. 1. Petroleum Geology Research and Laboratory Center of Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China;
    2. State Key Laboratory of Enhanced Oil Recovery of Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China;
    3. China University of Geosciences, Beijing 100083, China
  • Received:2015-03-27 Revised:2015-06-30 Online:2015-08-08 Published:2015-08-28

Abstract:

Samples from multiple sets of the Jurassic-Neogene conglomerate outcrops in Kuqa depression were collected and analyzed for the composition, flatness, sphericity, and size of gravel, and the sedimentary facies that had made everything happened, and for a semi-quantitative study of transportation distance of gravel in front of southern Tianshan Mountain.The results show a far-to-near pattern of gravel transport distance for the Jurassic-Neogene conglomerate.Gravels in the Lower Jurassic Ahe-Yangxia Formations migrated the farthest to 110-130 km, and those from the Neogene Jidike Formation moved the shortest at only 20 km.Between them, the gravels of the Upper Jurassic Kelaza Formation moved about 40 km, that of the Lower Cretaceous Yageliebu-Bashijiqike Formations ran at a distance range between 20 and 45 km and that in the Palaeogene conglomerate transported from 20 to 50 km.Combined with the previous apatite fission track data, the new results indicate that the uplift of the Tianshan Mountains can be divided into 4 stages(two of them were major unplifting and two of them were minor ones):the Triassic-Early Jurassic, Late Jurassic-Early Cretaceous, Late Cretaceous-Eocene, and Miocene-present.The composition, shape and size of the gravels as well as migration of provenance reflected by the gravel transport distance show that the sedimentary evolution of the conglomerate responded strongly to the 4 stages of uplifting process.

Key words: uplift of Tianshan Mountains, transportation distance, gravel geometry, conglomerate, Kuqa depression

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