新疆库鲁克塔格地区特瑞爱肯冰期下限及沉积物源分析
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本文为新疆地质勘查基金两权价款项目“新疆南天山东段大草湖一带1∶5万K45E014016 K45E014017、K45E015015、K45E015016、K45E015017五幅区域地质矿产调查”(编号:T15- 1- LQ25)的成果。


The lower limit and provenance analysis of the Neoproterozoic Tereeken glaciation in Quruqtagh area, Xinjiang
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    摘要:

    本文通过对新疆库鲁克塔格地区特瑞爱肯组底部含冰碛砾砂质泥岩的碎屑锆石进行U- Pb年龄测定,获得100组U- Pb年龄有效数据,最年轻碎屑锆石U- Pb年龄6525±120 Ma,该年龄代表了特瑞爱肯组的最大沉积年龄,也表示特瑞爱肯冰期的下限。本文获得的特瑞爱肯冰期下限与南沱冰期、Marinoan冰期下限较为一致,认为三者的发生具有等时性。对其余较老年龄分析,U- Pb年龄峰值为800 Ma和1911 Ma的碎屑锆石具有显著优势,特瑞爱肯冰期的沉积物源主要为来自715~887 Ma、1700~2300 Ma及2400~2800 M的岩石。

    Abstract:

    Objectives: The Quruqtagh area is located in the northeastern of the Tarim Block. The Quruqtagh area has four Neoproterozoic tillite units. It is of great significance to study the response of the Tarim block to the Neoproterozoic global glacial time. Due to the lack of chronological research, the start- up time of the Neoproterozoic Tereeken Glaciation is controversial. In this paper, zircon U- Pb ages of the tillites at the bottom of the Neoproterozoic Tereeken Formation were determined for the first time. The start time of the Tereeken Glaciation is estimated and the provenances are discussed. Methods: On the basis of detailed field geological survey, we performed the petrology and the zircon U- Pb dating of tillite at the bottom of the Tereeken Formation. Results: We obtained 100 sets of valid data, the youngest zircon age is 652.5±12.0 Ma, and the other three groups are 715~887 Ma, 1700~2300 Ma and 2400~2800 Ma. Disscussion and Conclusion:U- Pb dating of detrital zircons from the tillite at the bottom of the Tereeken Formation yielded 100 groups of U- Pb effective age and the youngest zircon ages 652.5±12 Ma, represent the maximum depositional age(lower limit time) of the Tereekan Formation and the lower limit of the Tereeken glaciation, which is consistent with the global Marinoan glaciation and Nantuo glaciation. We consider that the Tereekan glaciation, Nantuo glaciation and Marinoan glaciation are isochronous. The peak ages of the detrital zircons from the Tereeken Formation are 800 Ma and 1911 Ma, indicating that the provenances of the Tereeken Formation are the rocks aged 715~887 Ma, 1700~2300 Ma and 2400~2800 Ma.

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邓俊,刘传朋,葛跃进,刘同,王凯凯.2020.新疆库鲁克塔格地区特瑞爱肯冰期下限及沉积物源分析[J].地质论评,66(2):324-336,[DOI].
DENG Jun, LIU Chuanpeng, GE Yuejin, LIU Tong, WANG Kaikai.2020. The lower limit and provenance analysis of the Neoproterozoic Tereeken glaciation in Quruqtagh area, Xinjiang[J]. Geological Review,66(2):324-336.

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  • 收稿日期:2018-11-27
  • 最后修改日期:2018-11-27
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  • 在线发布日期: 2020-03-16
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