Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (2): 99-112.doi: 10.12108/yxyqc.20240210

• PETROLEUM EXPLORATION • Previous Articles    

Provenance analysis of Upper Triassic Xujiahe Formation in northeastern Sichuan Basin

BO Shangshang1,2, TIAN Jixian3, LI Yaoliang1, WANG Yetong1,2, WANG Hao1,2, SUN Guoqiang1   

  1. 1. Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
    3. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China
  • Received:2023-02-14 Revised:2023-03-15 Published:2024-03-06

Abstract: Based on field investigation of geological profiles,determination of heavy mineral content and detrital zircon U-Pb ages of key samples,combined with regional tectonic setting,age of peripheral geological bodies,stratigraphic distribution and palaeocurrent,the provenance of Upper Triassic Xujiahe Formation in northeastern Sichuan Basin was analyzed. The results show that:(1)The provenance of the sediments during the deposition period of Upper Triassic Xujiahe Formation in northeastern Sichuan Basin was derived from the northeast and southeast directions. The sediments of Xujiahe Formation in Qilixiang area were sourced from the Daba Mountain Geological Park in the northeastern piedmont zone and Heitianchi of Fuping Town in the southeastern piedmont zone,and subsequently deposited in the basin. During transportation from the piedmont zone to the basin,the sediment grain size underwent a change from coarse to fine,accompanied by an increase in the ZTR index.(2)The sediments of Upper Triassic Xujiahe Formation in the study area are mainly derived from the Qinling orogenic belt in northeast and the Jiangnan orogenic belt in southeast. The ages of detrital zircons are 210- 282 Ma,400-500 Ma,650-850 Ma,1 500-2 000 Ma,and 2 265-2 600 Ma,with peak values of ~213 Ma, ~427 Ma,~725 Ma,~1 694 Ma,~2 352 Ma,respectively. The sedimentary age of Xujiahe Formation should be no earlier than ~213 Ma.(3)~213 Ma corresponds to the formation of Mian-Lue suture zone,and the provenance of this stage is mainly from the south Qinling orogenic belt. ~427 Ma corresponds to the subduction and closure of Shangdan Ocean,and the provenance of this stage mainly originates from the north Qinling orogenic belt. ~725 Ma should be related to the breakup of Rodinia supercontinent,and the western Jiangnan orogenic belt is the most likely source of this age. Zircons of ~1 694 Ma age may have been formed during the amalgamation and fragmentation of the Columbia supercontinent,and the zircons of this age are mainly derived from the southern margin of the North China Plate and the western section of the Jiangnan orogenic belt. The zircons of ~2 352 Ma account for a small proportion and are derived from retrocyclic provenance.(4)The reservoirs of Xujiahe Formation in the study area are mainly developed in the braided river delta-shore-shallow lake depositional system under the northeast and southeast provenance supply systems,and the provenance in the two directions controls the rock types and pore development of the reservoirs,making it a strong regional character.

Key words: heavy mineral assemblage, zircon U-Pb dating, sediment source, Xujiahe Formation, Upper Triassic, northeastern Sichuan Basin

CLC Number: 

  • TE121.3
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