期刊
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
卷 385, 期 -, 页码 125-136出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.palaeo.2012.09.027
关键词
Pyrite morphology; Redox condition; First member of the Qingshankou Formation; South well of SLCORE I; Songliao Basin
资金
- National Basic Research Program of China (973 Program) [2012CB822002]
- National Natural Science Foundation of China [41102021]
- Central Public-interest Scientific Institution Basal Research Fund [K1005]
The study of sedimentary pyrite morphological characteristics provides useful information on depositional environments and early diagenic processes and can be used as an indicator of redox conditions in ancient lake bottom waters. The results of this study in the Songliao basin in northeastern China show that euhedral crystals and framboids are the dominant pyrite forms in the mudstones of the first member of the Qingshankou Formation (K(2)qn(1)). The framboidal size distribution indicates that during the deposition of K(2)qn(1), redox conditions in the bottom water fluctuated from oxic-dysoxic to euxinic-anoxic to oxic-dysoxic. The presence of euxinic-anoxic bottom water suggests that an anoxic event developed in the Songliao ancient-lake and continued for 196 ka. The development of an anoxic bottom environment was the most important factor in hydrocarbon source rock formation in the Songliao Basin. (C) 2012 Elsevier B.V. All rights reserved.
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