Paleoecology of the ordovician reef-shoal depositional system in the Yijianfang outcrop of the Bachu area, West Tarim Basin

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• 作者：Yangquan Jiao (1) (2)
  Liqun Wu (1) (2)
  Hui Rong (1) (2)
  Yongbiao Wang (3)
  Rui Wang (4)
  
• 关键词：paleoecology ; reef ; shoal depositional system ; Ordovician ; Tarim basin
• 刊名：Journal of Earth Science
• 出版年：2012
• 出版时间：August 2012
• 年：2012
• 卷：23
• 期：4
• 页码：408-420
• 全文大小：2558KB
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  2. Copper, P., 2002. Silurian and Devonian Reefs: 80 Million Years of Global Greenhouse between Two Ice Ages. In: Kiessling, W., Flugel, E., Golonka, J., eds., Phanerozoic Reef Patterns. / Society for Sedimentary Geology, Special Publication, Tulsa, 72: 181-38
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  7. Jin, Z. D., Zhu, W., Hu, X., et al., 2009. Mesogenetic Dissolution of the Middle Ordovician Limestone in the Tahe Oilfield of Tarim Basin, NW China. / Marine and Petroleum Geology, 26: 753-63, doi:10.1016/j.marpetgeo.2008.08.005 CrossRef
  8. Kang, Y. Z., 2005. Cases of Discovery and Exploration of Marine Fields in China (Part 4): Tahe Oilfield in Tarim Basin. / Marine Origin Petroleum Geology, 10: 31-8 (in Chinese with English Abstract)
  9. Li, Y., Kershaw, S., Mu, X. N., 2004. Ordovician Reef Systems and Settings in South China before the Late Ordovician Mass Extinction. / Palaeogeography, Palaeoclimatology, Palaeoecology, 205(3-): 235-54, doi:10.1016/j.palaeo.2003.12.010 CrossRef
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  14. Xiao, C. T., Cui, J. L., Zhu, Z. D., et al., 2004. A Study on Palaeoecology of the Lower Ordovian Reefs in the Yichang Area, Hubei. / Geological Review, 50(5): 520-29 (in Chinese with English Abstract)
  15. Zhang, S. B., Ni, Y. N., Gong, F. H., et al., 2003. A Guide to the Stratigraphic Investigation on the Penphery of the Tarim Basin. Petroleum Industry Press, Beijing. 17-6, 161-71 (in Chinese)
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• 作者单位：Yangquan Jiao (1) (2)
  Liqun Wu (1) (2)
  Hui Rong (1) (2)
  Yongbiao Wang (3)
  Rui Wang (4)
  
  1. Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan, 430074, China
  2. Faculty of Earth Resources, China University of Geosciences, Wuhan, 430074, China
  3. Faculty of Earth Sciences, China University of Geosciences, Wuhan, 430074, China
  4. College of Geosciences, China University of Petroleum, Beijing, 102249, China
  
• ISSN：1867-111X

文摘

The reef-shoal depositional system of the Ordovician carbonate platform margin is well exposed in the Yijianfang () outcrop of the Bachu () uplift region, which offers an advantageous condition to study their paleoecology. Using a detailed field geologic survey and illustrated profiles of typical depositional systems, three types of genetic facies associations can be recognized in the reef-shoal depositional system: an organic reef, an organic shoal, and an upper slope. The organic reef is composed of three types of genetic facies (a reef base, a reef core, and fore-reef breccias); the organic shoal is formed from five types of genetic facies (tide channels, fore-reef inner shoals, fore-reef outer shoals, back-reef inner shoals, and back-reef outer shoals). The studies of the paleontological assemblage in each genetic facies of the depositional system indicate that the fauna preserved in each genetic facies are varied. The calathium, archaeoscyphia, bryozoan, and calcareous alga are well preserved in the organic reefs. The organisms preserved in the organic shoals are generally fragmented, while well-preserved girvanella and nuia siberica with a content of about 15% in the back-reef outer shoals are the most characteristic and different from others. The sinoceras, trilobites, and gastropods are well preserved in the upper slope deposits. The studies will demonstrate that the reef-shoal complexes developed above the base of the fair-weather wave base and that the original hydrodynamic conditions for the reef core forming is the stronger and become more and more low-energy from the inner part to outer part of the organic shoals.