黔北桐梓松坎志留系石牛栏组的后生动物礁

发布时间：2019-01-26 07:57

【摘要】：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。
[Abstract]:The ShiNiulan member of the late Shiniulan formation in Tongzi Silurian, northern Guizhou Province, is dominated by crustal limestone, which is distributed in the shallow water area of the surface sea north of the central Guizhou Paleocontinent. In the upper part of ShiNiulan section of Tongzi Songhan Hanjiadian section, the epizoan reef facies unit is exposed, the thin layer limestone reef wing subfacies is covered with no bedding, and the biolimestone gravel block without sorting belongs to the collapse rock subfacies. It can be inferred that the growth of the unexposed point reef has reached the stage of obvious forward geomorphologic uplift, and the reef coral or the consolidated reef limestone in the core of the reef has been transported to the surrounding reef body after being broken under the action of strong current. A layered reef is overlaid over the sloughing rock. During the whole process of reef growth, the coral framework is the main body of the bound rock, and the biodiversity and abundance of the reef animals and the reef-attached animals are high. The ecological community differentiation of this reef formation period is closely related to the distance from the coastline of the central Guizhou ancient land. The Daijiagou area in the southern region belongs to the near-shore stromatolite growth zone, and Hanjiadian is the southern margin of the metazoan shelf type reef distribution. The point reef distributes northward and ends at the dam pond. The rise of Tongzi resulted in the exposure of the regional seabed and the end of reef growth.
【作者单位】：贵州省地质调查院;中国科学院南海海洋研究所;中国科学院南京地质古生物研究所中国科学院资源地层学与古地理学重点实验室;
【基金】：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
【分类号】：P534.43

【相似文献】