Detrital Zircon U-Pb Geochronology from Zhaoling Formation in Tangwangling
doi: 10.14027/j.cnki.cjxb.2016.03.007
Funds:
Oil and Gas Project of China Geological Survey, No. 1212011220761; Independent Innovation Funding Program for Graduate Students of Northwestern University, No. YZZ14020; Fund for Fostering Talents in Basic Science of National Natural Science Foundation of China, No. XDCX2014-18
- Received Date: 2014-09-04
- Rev Recd Date: 2015-06-23
- Publish Date: 2016-06-10
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Key words:
- south margin of the Ordos Basin /
- Tangwangling conglomerates /
- Zhaoling Formation /
- U-Pb geochronology /
- stratigraphic formation time /
- sedimentary provenance
Abstract: The deposition time and provenance of Zhaoling Formation in Tangwangling has not been conclusiving since it was found, In order to determine the Zhaoling Formation's assignment, this article has performed studies with the clastic sample from Zhaoling Formation by the method of LA-ICP-MS zircon U-Pb dating, based on the age distribution of zircons this article discussed the deposition time and sedimentary provenance of Zhaoling Formation. The results shows: The detrital zircon ages of Zhaoling Formation mainly include 744~943 Ma(n=6), 1 005~1 412 Ma (n=15), 1 449~2 209 Ma (n=255) and 2 274~2 696 Ma (n=49), the corresponding peak ages are 815 Ma, 1 182 Ma, 1 811 Ma, 2 454 Ma, the minimum age for single detrial zircon is 774 Ma. At the same time, the zircon U-Pb ages shows the deposition time of Zhaoling Formation is similar to Zhengmuguang Formation but not Pingliang Formation, especially lack of the characteristics detrital zircon U-Pb peak age of 454 Ma, they all show that the Zhaoling Formation maximum deposition era is Precambrian. The comparative analyses of zircon U-Pb age shows that the main sources of Zhaoling Formation come from the paleoproterozoic metamorphic basement of North China Craton and Precambrian complex granitic intrusion of North Qinling Mountain, respectively.
| Citation: | ZHANG WenLong, CHEN Gang, ZHANG HuiRuo, GAO Lei, YANG Fu, SHI XiaoLin, SHEN JinJiang. Detrital Zircon U-Pb Geochronology from Zhaoling Formation in Tangwangling[J]. Acta Sedimentologica Sinica, 2016, 34(3): 497-505. doi: 10.14027/j.cnki.cjxb.2016.03.007
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