摘要
广西来宾吴家坪组中段发育的礁体,厚约100m,为陆棚上盆内台地边缘礁。造礁生物为钙质海绵、蓝绿藻和等。含量一般在25—30%,局部可达75%以上;碳酸盐岩色浅质纯,不含燧石及陆源物质,地貌上呈低幅度隆起。以海绵()起支撑障积作用,蓝藻起粘结作用的藻、海绵粘结障积岩-藻、海绵粘结骨架岩型的生物岩礁。
Abstract
Bioherm developed in the middle of the Wujiaping Formation is less than 100 m thick and belongs to marginal reef of intra-basin platform on shelf.The main features of the bioherm are: 1.It is a low range upwarp which is made of white massive rocks within visible lamination. 2.It contains abundant reef-building organisms such as calcisponges, blue-green algae, , green algae and red algae. The content is usually 25-30%, locally above 75%. 3.It is composed almost completely of pure carbonate rocks without chertsand terrigenous debris. 4.It has a complete facies assemblage of slump microbreccia in reef-front,algae-sponge reef limestone in reef core and micrite in back-reef. The primary reef-building organisms are calcisponges,tabulozoans, and . The first group organisms are supporting and baffling ones, and the last two are binding and encasing ones.
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