SUN Jiao-peng1, CHEN Shi-yue1, PENG Yuan2, GAO Li-xiang1, MA Shuai1, SHAO Peng-cheng1, LIU Jin1, DAI Kui2, ZHENG Ce2
(1. China University of Petroleum, School of Geosciences, Qingdao 266555, China;
2. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100037, China)
Abstract: There is a marked difference between major elements and trace elements in the lower part of glutenite segment (Pt3qna) and quartz sandstone (Pt3qnb) from the Quanji group Oulongbuluke block. Major and tract elements in quartz sandstone (Pt3qnb) samples except for SiO2, V, Zr, and Hf contents were higher than those in glutenite segment (Pt3qna) samples, and the remaining elements are visibly lower than those in glutenite segment (Pt3qna) samples. The clastic sedimentary rocks deposited in the passive continental south dipping margin , and the detrital material comes from the middle Proterozoic Dakendaban group. Different rifting stages of the rift trough and differences of ancient climate and environment are the direct causes for the great difference in glutenite lithology types and geochemical characteristics of the Quanji group Oulongbuluke block. In the Early Neoproterozoic, the Yuka-Shaliuhe tectonic belt formed the rift. Subsequently, the rift trough gradually expanded, tectonic activity in the study area gradually stabilized, terrigenous clastic rock compositional maturity and structural maturity of Quanji group also significantly increased. Large variation in the CIA index shows that the study area has been affected by low latitude glaciation events. Low number of CIA in the lower part of glutenite segment (Pt3qna) is the expression of "Snowball Earth" in the study area; high CIA number of quartz sandstone (Pt3qnb) reflects the hot and humid paleoclimate environment, which is a normal performance of the study area in the low latitude.
Keywords: Oulongbuluke block; Quanji group; glutenite; geochemistry; geological significance
Email: sunjiaopeng@163.com
ACTA MINERALOGICA SINICA Vol. 36, No. 2, 2016, Page 174-182
