Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5162945 | Organic Geochemistry | 2008 | 10 Pages |
Abstract
Steroids with unconventional side chains in ancient sediments and petroleum have been increasingly used as age diagnostic markers. Triaromatic dinosteroids and dinosteranes occur widely throughout the Eocene-Oligocene Shahejie Formation in the southeastern Bohai Bay Basin, China, consistent with its abundant fossil dinoflagellate assemblages. In addition, 24-norcholestane biomarkers, which commonly appear in marine oils, have been found in this lacustrine formation. Although a firm link has not been established between 24-norcholestane and specific modern taxa, both diatoms and dinoflagellates are shown to be likely sources of 24-norcholestanes. Although the Shahejie strata lack intact diatom frustules, they do exhibit a good relationship between 24-norcholestane, other molecular fossils of dinoflagellates and dinocysts. Dinoflagellates are important precursor taxa of 24-norcholestanes and the various species identified in Eocene-Oligocene lacustrine shales and mudstones of the Shahejie Formation are all potential sources of the 24-norcholestanes.
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Authors
Guangli Wang, T.-G. Wang, Bernd R.T. Simoneit, Zhilin Chen, Linye Zhang, Jinli Xu,