黔北桐梓松坎志留系石牛栏组的后生动物礁METAZOAN REEF OF THE SILURIAN SHIHNIULAN FORMATION AT SONGKAN,TONGZI,NORTHERN GUIZHOU
邓小杰,王冠,黄勇,代雅然,马义波,龙胜清,张国祥,李越
摘要(Abstract):
黔北桐梓志留纪兰多维列世埃隆晚期石牛栏组石牛栏段以壳相灰岩为主,分布于黔中古陆以北的陆表海浅水区。桐梓松坎韩家店剖面石牛栏段上部出露后生动物礁相单元,薄层灰岩礁翼亚相之上覆盖无层理、无分选的生物灰岩砾块则属塌积岩亚相,由此可推测未出露的点礁生长已经达到明显的正向地貌隆起阶段,礁核部分的造礁珊瑚或已固结的礁灰岩在强水流作用下破碎后被搬运到礁体周围堆积;在塌积岩之上叠复层状礁。在整个礁体生长过程中,珊瑚格架是构建绑结岩的主体,造礁动物和附礁动物的生物多样性和丰度高。这个造礁期的生态群落分异与距离黔中古陆海岸线的距离密切相关,南区代家沟属近岸叠层石生长带,韩家店是后生动物格架型点礁分布的南缘,点礁分布向北延伸区截止于水坝塘。桐梓上升造成区域海底暴露并终结礁相生长。
关键词(KeyWords): 生物地层;后生动物礁;石牛栏组;志留纪;松坎;桐梓;黔北
基金项目(Foundation): 中国科学院战略性先导科技专项(B类,子课题XDB10010503);; 国家自然科学基金(41372022);; 国家基金委创新研究群体项目(41290260);; 贵州省科技厅重大科技专项(黔科合重大专项字[2014]6003号);; 贵州省地矿局青年科研项目(黔地矿科合[2012]16号)资助
作者(Author): 邓小杰,王冠,黄勇,代雅然,马义波,龙胜清,张国祥,李越
DOI: 10.19839/j.cnki.dcxzz.2017.01.005
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