Lower Cretaceous detrital zircon U-Pb dating and its provenance significance in Hari sag, Yingen-Ejinaqi Basin, Inner Mongolia
Chen Zhi-Jun1, Gao Yi-Wen1, Meng Jiang-Hui2, Li Ke-She1, Wu Feng1, Chang Tian-Tian1, Liu Tao1, Han Chang-Chun1
1 Reseach Institute of Yanchang Petroleum(Group)Co., Ltd.,Xi'an 710075,Shaanxi; 2 Hubei Cooperative Innovation Center of Unconventional Oil and Gas,Yangtze University,Wuhan 430100,Hubei
Abstract It is generally recognized that the source of Lower Cretaceous in Yingen-Ejinaqi Basin is from orogenic belt or uplift around the sags,but some queries about provenance were still unanswered,such as the specific formations,exact source area ,etc. In this paper,taking Hari Sag as an example,based on geochemical test analysis and zircon U-Pb dating of 8 drilling rock samplings,the study of geochemical characteristics and detrital zircon U-Pb chronology were carried out. The results showed that: (1)Zircon could be divided into 4 types by age,they are Triassic zircons,Permian zircons,Carboniferous zircons and ancient zircons,and the corresponding age were $237.9\pm3.2\pm-238.3\pm8.4$ Ma, $255.0\pm9.7-285.9\pm4.3$ Ma, $307.0\pm23.0-330.0\pm3.0$ Ma and $434.0\pm4.0-2584.0\pm14.0$ Ma respectively. (2)The characteristics of trace elements and the zircon ages indicated that the sedimentary source of the Lower Cretaceous in Hari Sag was dominated by the Permian and Carboniferous provenance,including pluton and sedimentary strata. (3)The age distribution of detrital zircon indicated that there were multiple provenance in the Lower Cretaceous of the Hari Sag,such as Honggeeji mountain in the northwest,Zongnai mountain in the south,and the Qiedao mountain in the east of the sag. (4)There were different contribution of these provenance to Bayingebi Formation and Suhongtu Formation,like Zongnai mountain was the biggest contributor to Suhongtu Formation. This contribution difference might be due to the transport distance of sediments,denudation rate of geological bodies,structural movements and so on. The determination of the provenance of the Lower Cretaceous was of great significance for the restoration of the Early Cretaceous Prototype Basin,the establishment of the Early Cretaceous sedimentary paleogeographic model and many more.
Fund:Financially supported by the Scientific and Technological Project of Yanchang Petroleum(Group)Co., Ltd., (No. ycsy2016ky-A-09)
Corresponding Authors:
Meng Jiang-Hui,born in 1983,is an associate professor of Yangtze University. He is engaged in research of oil geology. E-mail: mjhyzu@163.com.
About author: Chen Zhi-Jun,born in 1980,is a senior engineer at Reseach Institute of Yanchang Petroleum(Group)Co.Ltd. He is mainly engaged in the researches of sedimentology and hydrocarbon geochemistry. E-mail: chenzhijun2203@aliyun.com.
Cite this article:
Chen Zhi-Jun,Gao Yi-Wen,Meng Jiang-Hui et al. Lower Cretaceous detrital zircon U-Pb dating and its provenance significance in Hari sag, Yingen-Ejinaqi Basin, Inner Mongolia[J]. JOPC, 2018, 20(6): 1086-1101.
Chen Zhi-Jun,Gao Yi-Wen,Meng Jiang-Hui et al. Lower Cretaceous detrital zircon U-Pb dating and its provenance significance in Hari sag, Yingen-Ejinaqi Basin, Inner Mongolia[J]. JOPC, 2018, 20(6): 1086-1101.
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