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《Journal of Chengdu University of Technology(Science & Technology Edition)》 2005-01
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Late Paleozoic reefs from sequence framework in Youjiang basin

MA Jian-ming~(1,2), HOU Ming-cai~1, CHEN Hong-de~1, TIAN Jing-chun~1, QIN Jiang-xiong~1, WANG Cheng-shan~3(1.Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China; 2.The South Exploration & Exploitation Branch Company of SINOPEC, Kunming 650200, China; 3.China University of Geosciences, Beijing 100083, China)  
By studying the genetic types and space-time distribution of the Devonian and Permian reefs in the Youjiang basin, then combined with sequence stratigraphy study results, the reefs are divided into LST reef, SMT reef, TST reef and HST reef. LST reef characterized by aggradational bioherm or patch reef is generally associated with mixed clastic turbidite, siliceous limestone and mudstones reef. The shelf margin reef is larger in size and relatively more in amount compared to LST reef and develops within interplatform basin and slope because of a better hydrodynamic environment during SMT. During transgression, the interplatform basin bioherm-reef complex continuously or discontinuously retrogrades towards basin margin and slope and then internal platform, and finally brings about transgresssive bioherm-reef complex overlapping from basin to platform, including interplatform-basin reef, slope reef, platform edge reef and internal platform reef with reefal top characterized by hard ground, bioturbate texture, submerged corrosion surface, submerged surface, submerged giving up surface. The reef cover includes silicalite, volcanic clastic turbidite, euabyssite, specularite, deepwater retrograde facies, biology dense layer, and pelagic limestone, phosphate lime mud cotained Mn et al. Its growth modes are catching-up and giving-up. The reef kinds are tower reef, catenarian reef and point reef. HST reef characterized by aggradational bioherm, transgresssive bioherm and mix reef develops abroad interplatform, platform margin, slope and basin among platforms environments, with shallowing upward sequence. Its reef top includes exposure surfaces, karst surfaces, scour surfaces, calcified crust, dolomite cover et al. Its reef cover consists of eluvial facies, open platform, turbidite, biology dune or bar. The main kinds are barrier reef, atoll, and horseshoe atoll.
【Fund】: 四川省重点学科"构造地质学"建设基金资助项目(SZD0408)
【CateGory Index】: P618.13
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