期刊
JOURNAL OF ASIAN EARTH SCIENCES
卷 45, 期 -, 页码 95-105出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jseaes.2011.09.021
关键词
Fushun basin; Eocene; Palaeoclimate; Oil shale
资金
- Doctoral Foundation of China [20050183051]
- Ministry of Land and Resource for Public welfare [200811013]
- National Science Foundation of China [40972076]
- Sino-German Joint Group of Palaeontology and Geosciences (Sino-German Centre of Science Promotion) [GZ295]
The Fushun basin is a small, explored, coal and oil shale-bearing, Cenozoic fault basin in the Liaoning Province, northeast China. The basin mainly consists of Eocene swamp to lacustrine deposits of the Guchengzi to Xilutian Formation, and contains the biggest opencast oil shale mine in Asia. This mine has provided an ideal opportunity to undertake palaeoclimate reconstruction in this basin based on a single geological profile and the analyses of 93 samples, using various approaches, namely field geological observation, clay mineralogical and geochemical (Sr/Ba, Sr/Cu, stable C and 0 isotope) analyses, all of which were compared with palaeobotanical data. The Eocene climate of Fushun basin evolved from warm temperate to north subtropical, and generally changed from warm humid to subhumid-semiarid. Paleoclimatic and geochemical parameters shows that the very warm and humid climate during Jijuntun Formation increased the initial productivity of lake water, and caused a steady stratification of the lake water, then caused oxygen lack in the bottom of water. Productivity of the lake provides the mean origin of organic matters for oil shale formation, and steady anoxic environment is beneficial for the conservation of organic matters. (C) 2011 Elsevier Ltd. All rights reserved.
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