Geochemical Characteristics and Paleoenvironment Paleoclimate Significance of Mudstone in the Shang-Gan-Chai-Gou Formation at the Northwestern Margin of Qaidam Basin
MA Wan-li1, JIANG Xiao-qing2, LI Xuan1, ZENG Liang1, YANG Ping2, MA Jin-long1*
1. School of Earth Sciences, Lanzhou University, Key Laboratory of Mineral Resources in Western China (Gansu Province),Lanzhou 730000, China; 2. Research Institute of Petroleum Exploration and Development, PetroChina Qinghai Oilfield Company, Dunhuang Gansu 736202, China
Abstract：The study of the Cenozoic paleoenvironment in the northwest margin of Qaidam basin has great theoretical and practical significance for revealing the formation and evolution of oil and gas in the basin. In this paper, 26 mudstone samples from the Lenghu No.4 well in the Shang-Gan-Chai-Gou formation were studied, and the paleoenvironmental and paleoclimatic conditions were discussed according to variation characteristics of major and trace elements in these mudstone samples. The results showed that: nearly all Sr/Ba values were less than 1, while all Th/U values were greater than 2, in according with the terrestrial freshwater environment; values of V/Cr, Ni/Co, U/Th, and V/Sc ranged from 0.07 to 0.01, 3.25 to 2.18, 0.48 to 0.18, and 8.82 to 5.53, respectively, indicating the oxidation environment, which is also showed by the brown color sediments. It can be speculated that the uplift of the northern basin margin by the mid Himalayan movement resulted in the subsidence of lake basin and the decline of lake level, and thus formed the oxidation environment. The paleoclimatic index Sr/Cu was 13.35-5.91, indicating that the climate was generally warm and humid, and, approximately, periods of warm and humid climate were31.0-28.7 and 27.7-22.5 Ma, while dry periods were28.7-27.7 and 22.5-21.0 Ma. The temperature and humidity trends indicated by Sr/Cu, Rb/Sr, and Fe/Mn were basically the same. The sedimentological and paleontological characteristics also showed that the temperature and humidity environment should have been maintained for the whole sedimentary period. The warm and humid climate and the freshwater environment reflected the climate background of global warming in this period. The appearance of the periodic arid climate might be affected by the uplift of Tibet Plateau in the early stage, and mainly related to the regression of north Tethys in the late stage.
马万里, 江小青, 李璇, 曾亮, 杨平, 马锦龙. 柴达木盆地西北缘上干柴沟组泥岩地球化学特征与古环境古气候意义[J]. 矿物岩石地球化学通报, 2021, 40(5): 1166-1180.
MA Wan-li, JIANG Xiao-qing, LI Xuan, ZENG Liang, YANG Ping, MA Jin-long. Geochemical Characteristics and Paleoenvironment Paleoclimate Significance of Mudstone in the Shang-Gan-Chai-Gou Formation at the Northwestern Margin of Qaidam Basin. Acta Metallurgica Sinica, 2021, 40(5): 1166-1180.
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