Paleoecology of the Ordovician Reef-Shoal Depositional System in the Yijianfang Outcrop of the Bachu Area, West Tarim Basin

The reef-shoal depositional system of the Ordovician carbonate platform margin is well exposed in the Yijianfang (一间房) outcrop of the Bachn (巴楚) uplift region, which offers an advantageous condition to study their paleoecology. Using a detailed field geologic survey and illustrated profiles of typic...

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Veröffentlicht in:Journal of earth science (Wuhan, China) China), 2012-08, Vol.23 (4), p.408-420
1. Verfasser: 焦养泉 吴立群 荣辉 王永标 王瑞
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description The reef-shoal depositional system of the Ordovician carbonate platform margin is well exposed in the Yijianfang (一间房) outcrop of the Bachn (巴楚) 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 weil-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.
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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 weil-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. 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Earth Sci</addtitle><addtitle>JOURNAL OF EARTH SCIENCE</addtitle><description>The reef-shoal depositional system of the Ordovician carbonate platform margin is well exposed in the Yijianfang (一间房) outcrop of the Bachn (巴楚) 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 weil-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. 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Earth Sci</stitle><addtitle>JOURNAL OF EARTH SCIENCE</addtitle><date>2012-08-01</date><risdate>2012</risdate><volume>23</volume><issue>4</issue><spage>408</spage><epage>420</epage><pages>408-420</pages><issn>1674-487X</issn><eissn>1867-111X</eissn><abstract>The reef-shoal depositional system of the Ordovician carbonate platform margin is well exposed in the Yijianfang (一间房) outcrop of the Bachn (巴楚) 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 weil-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.</abstract><cop>China University of Geosciences</cop><pub>China University of Geosciences</pub><doi>10.1007/s12583-012-0264-3</doi><tpages>13</tpages></addata></record>
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subjects Archaeoscyphia
Biogeosciences
Calathium
Channels
Coral reefs
Deposition
Earth and Environmental Science
Earth science
Earth Sciences
Gastropoda
Genetics
Geochemistry
Geological surveys
Geology
Geotechnical Engineering & Applied Earth Sciences
Girvanella
Marine
Ordovician
Outcrops
Paleoecology
Recognition
Reefs
Sedimentation & deposition
Shoals
Trilobita
古生态
塔里木盆地
奥陶系
巴楚地区
沉积体系
滩相
野外地质调查
露头
title Paleoecology of the Ordovician Reef-Shoal Depositional System in the Yijianfang Outcrop of the Bachu Area, West Tarim Basin
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