广西泥盆纪最早的生物礁

广西泥盆纪的沉积相可划分为滨岸碎屑岩相、碳酸盐台地相和陆间海槽相等三个相区。其中最早的碳酸盐台地形成始于早埃姆斯阶晚期,同时伴生小型生物丘和在台地边缘发育的小点礁。本文讨论了广西具代表性的德保钦甲点礁,为一点礁—泥丘组合。

THE EARLIEST BIOHERM OF THE DEVONIAN IN GUANGXI

Study on the Devonian sedimentary facies in Guangxi reveals that it may be plotted to three facies areas: shoreface clastic area, carbonate platform area and inter-land sea trough. The carbonate platform facies developed after the late early Emsian Stage and was accompanied by the development of small bioherms. Subsequently patch-reefs developed intermittently at the edges of the platform. The bioherms and patch reefs discussed in this paper were the earliest smalb reefs which developed in the Devonian Sea of Guangxi. Two bioherms and one patch-reef have been discovered. One bioherm is situated at Menggong(Guigon City); it consists of Favosites and other tabular corals; its frame is 2-45 cm high, lenticular in shape, and 50-150 cm in diameter. The other is the Hanshan coral-stromatoporoid bioherm from Longlin County. The patch reef which has the most typical character is located at Qinjia, Debao County.