DOI:10.19762/j.cnki.dizhixuebao.2020252
 
Geochemical characteristics and its implications of the third Member of Paleogene Shahejie Formation from the Damintun sag, Liaohe depression
Author NameAffiliationE-mail
ZHANG Ni 1) College of Material Engineering, Jinling Institute of Technology, Nanjing, 211169 zhangni@jit.edu.cn 
WU Yi 2) Research Institute of Petroleum Exploration and Development, PetroChina LiaoheOilfield Company, Panjin, Liaoning, 124010 liaohewuyi@126.com 
ZHANG Xia 3) School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023  
HUANG Shuya 3) School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023  
LI Tiejun 2) Research Institute of Petroleum Exploration and Development, PetroChina LiaoheOilfield Company, Panjin, Liaoning, 124010  
ZHANG Xinpei 2) Research Institute of Petroleum Exploration and Development, PetroChina LiaoheOilfield Company, Panjin, Liaoning, 124010  
LIN Chunming 3) School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023  
JIANG Kaixi 3) School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023  
XIA Changfa 3) School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023  
Abstract:Based on the geochemical data from the third Member of Shahejie Formation (E s 3),from the well Shenjian 5 in the Damintun sag, the sedimentary environment, geological structural background, parent rocks and provenance are studied in detail. Results show that the parent rocks of E s 3 are felsic volcanic rocks from the upper continental crust and the Archaean rocks. The A- CN- K, SiO 2- Al 2O 3, and the Th- Th/U discrimination diagrams display the low degree of chemical weathering in the Damintun sag. Based on cluster analysis, the vertical distribution characteristics of 10 element ratios such as Sr/Cu, Sr/Ba and V/(V+Ni) values are selected to reconstruct the paleoenvironment in the study area. Paleoclimate of the sag is mainly dry- heat from E s 4 3 Ⅱ to E s 3 3 Ⅲ, with low salinity and weak restore environment in the ancient lake. It shows that the significant influence of paleoclimate on the elemental distribution in the study area is mainly related to the depositional environment and closed tectonic environment in E s 3. The Damintun sag was situated in a tectonic background characterized by both continental island arc and passive continental margin, under the general background of subduction of the Pacific plate beneath the Eurasian plate in the late Jurassic- late Eocene stage. It is speculated that the sediments of E s 3 mainly came from the Archean migmatite and migmatite gneiss in the Archean metamorphic basement in this area and intermediate acid igneous rocks formed in the Mesozoic. The parent rocks were also affected by the volcanic activities in the late Eocene.
keywords:Liaohe depression  Damintun sag  provenance  geochemistry  the third Member of Shahejie Formation
View Full Text  View/Add Comment  Download reader
You are a visitor1076504  Beijing ICP license No. 05032737-7; Beijing public network security license No.
All Rights Reserved:《Acta Geologica Sinica》(Chinese Version)
The Competent Units:China Association for Science and Technology ; The Organizer :Geological Society of China
Address: No. 26 Baiwanzhuang Street, Xicheng District, Beijing 100037, China; Zip Code :100037 The Phone :+86(10) 6831 2410, +86(10) 6899 9025 E-mail: dizhixuebao@163.com
Supported by Beijing Qinyun Science and Technology Development Co., Ltd 
WeChat