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A preliminary biogeochemistry-based quantification of primary productivity of end-Permian deep-water basin in Dongpan Section, Guangxi, South China |
| ZHANG Yang1, HE Weihong1, FENG Qinglai2 |
| 1.Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China; Key Laboratory of Biogeology and Environmental Geology of Ministry of Education, China University of Geosciences, Wuhan 430074, China; 2.State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China |
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Abstract In this paper, the mean primary productivity of the Talung Formation in the deep-water basin (50–500 m depth) of Dongpan, Guangxi, South China, was calculated, roughly ranging from 0.1 to 0.6 g C · m-2 · day-1 on the basis of the content of the trace element Cu. Results showed that the primary productivity obtained was comparable with the previously-reported data for the black shale of the Phosphoria Formation, a Permian phosphate deposit in the northwest United States, and also similar to that of the modern deposit in the Cariaco basin, Venezuela. It was observed that the primary productivity increased with the enhanced abundance of algae and photosynthetic bacteria, and with the decrease in both the radiolarian individuals and the body size of brachiopods during the faunal mass extinction. This ecological coupling indicates that the changes of primary productivity are closely related to the propagation and the decline of producers (algae and bacteria), and that consumers (radiolarians and brachiopods) probably have little influence on the changes of primary productivity.
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Issue Date: 05 December 2007
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