Journal of Jilin University(Earth Science Edition) ›› 2018, Vol. 48 ›› Issue (5): 1405-1415.doi: 10.13278/j.cnki.jjuese.20170119

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Age Determination of Dolomite Breccia in Well PSBX1 of Markit Slope in Tarim Basin

Luo Shaohui1, Li Jiumei2,3, Wang Hui1   

  1. 1. Institute of Exploration and Development of Northwest Oil Branch, SINOPEC, Urumqi 830011, China;
    2. Key Laboratory of Resource Exploration Research of Hebei Province, Hebei University of Engineering, Handan 056038, Hebei, China;
    3. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
  • Received:2017-12-27 Published:2018-11-20
  • Supported by:
    Supported by Major National R & D Projects (2011ZX05049-001-002)

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Abstract: The dolomitic breccia strata is drilled in Well PSBX1, Maigaiti slope, Tarim basin. Its age is determinated based on the data of thin section, paleontology sporopollen, isotope, platinum group elements and outcrop profiles. The results show that the 6 884-7 068 m well interval belongs to the Paleogene Tuyiluoke Group, which has very few fossils, 7 068-7 150 m well interval belongs to the Upper Cretaceous Yigeziya Group, which has a lots of sporopollen fossils. The Paleogene-Cretaceous boundary of this well lies at 7 068 m with an abrupt difference in carbon isotope, indicating a dramatic change of marine environment, which can be compared with the global K/E boundary. At this depth, the platinum group elements has obvious anormalies, their contents increase significantly, especially Rh, Ru, Ir, Os and so on. Through this determination, we have enriched our uderstanding of the sedimentary pattern of the Markit slope during the Late Cretaceous to the Early Paleogene.

Key words: Tarim basin, Markit slope, Well PSBX1, carbonate rocks, stratigraphic age determination

CLC Number: 

  • P59
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