Silurian Reefs and Palaeoenvironment Evolution in Chuandongnan-Qianbei, China
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摘要: 川东南—黔北地区下志留统分布广泛,出露好,化石丰富,在海相碎屑沉积中不同程度地发育了碳酸盐岩和生物礁。我们通过对重庆綦江观音桥、贵州坡渡及邻区石牛栏组的野外考察和综合研究发现,生物礁主要发育在早志留世中晚期的石牛栏组中、下部(大致相当于兰多维列中期),类型为小型点礁、生物丘及生物层。造礁生物以床板珊瑚、皱纹珊瑚,层孔虫为主;附礁生物包括苔藓虫、腕足类、鹦鹉螺、海百合等,礁基为生屑滩或瘤状灰岩。礁的发育受区域生境条件制约,靠近黔中隆起的浅海缓坡地带,是生物礁生长发育的有利地区。Abstract: The Lower Silurian Series in the Chuandongnan-Qingbei area of China is well Groped out and contains abundant fossils. Theauthors have discovered reefs spreading in varying degrees on the layer through field trip and research Qijing Guanyinqiao ofChongqing, Puodu and its neighbouring area. Reef Typifing point, dune, strata grew into the middle-lower layer of Shiniulan for-mation (equal to middle llandovery ).Reef-building biota is mainly composed of Tabulata，Tetracorallia，Stromatoporida.Biodetritus bank and knotty limestone formed reef bottom. Reef growing and spreading was restricted by palaeoenvironment. Theshallow slope zone nearing Qianzhong uplift is favorable to reef development.
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Key words:
- Chuandonnan-Qianbie /
- Lower Silurian Series /
- reef /
- biostrata /
- Shiniulan Formation /
- palaeoenvironment /
- evolu-tion
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[1] (1) 张廷山等.中国川西北地区志留纪生物礁.成都:科技大学出版 社，1994.
(2) 刘宝君等.中国南方古大陆沉积地壳演化与成矿.北京:科学出 版社.
(3) 成汉均，王玉忠.五峰期上扬子淡化海成因之探讨.地层学杂 志，1991,15(2).
(3) 金淳泰.西南地区地层总结(志留系).成都:地质矿产研究所。(5) 李积金等.中国扬子海盆奥陶纪末期生群集群绝灭事件.地层 学杂志,1993,17(4).
(6) 成都地质矿产研究所.四川蕃江观音桥志留纪地层及古生物. 成都:四川人民出版社.
(7) 范嘉松.古代生物礁研究中的若干间题，兼论我国西南地区二 叠系生物礁的类型.石油与天然气地质，1988,9(1).
(8〕Kershaw S，Classification and Geological Significance of Biostromes. -Facies.，1994, 31;81-92. -
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