从地球生物学角度讨论华南中二叠世海相烃源岩缺氧沉积环境成因模式.pdf

32 6 ) ) ) V ol . 3 2 N o . 6 2 0 0 7 1 1 Earth Science ) J our nal of China U niversit y of G eosciences N ov . 2 0 0 7 1, 2 1 颜佳新 , 刘新宇 1. 中国地质大学生物地质与环境地质教育部重点实验室, 湖北武汉 430074 2. 中国地质大学地球科学学院, 湖北武汉 430074 : , . , , , . , . ; , , . , . , . : ; ; ; ; . : P 736 . 22 : 1000 - 2383 2007) 06- 0789- 0 8 : 2007 - 08- 26 Geobiological Interpretation of the Oxygen-Deficient Deposits of the Middle Permian Marine Source Rocks in South China A Working Hypothesis Y A N J ia-x in 1, 2 , L IU X in-yu1 1.K ey L aboratory of Biogeology and Env ironmental Geology of Ministry of Education, China University of Geosciences , Wuhan 430074, China 2. F aculty of Ear th ciences , China University of Geosciences , Wuhan 430074, China Abstract T o decipher the o rig in of ox yg en- def icient shelf deposit s is signif icant for t racing the distr ibutions of mar ine hydro- car bo n source r ocks and interpreting the evo lutio n of depositional env iro nments . T he or ig in of the M iddle P ermian Chihsia For matio n fr om So ut h China remains a puzzle fo r lo ng , w ith its evident o xy gen- def icient f eatures associated w ith div erse ben- tho s. T his paper int roduce brief ly the nat ur e o f ox yg en- def icient shelf environment as w ell as subdivision of related paleox y- g enat ion f acies, and show s a ty pical Chihsian depositional sequence w ith eco log ical and g eochemical f eatur es . M assiv e bio- clast ic limestone fro m the middle o f the sequence w as believed to be for med under the aero bic co nditio ns, suppo rting by both eco lo