【作者】 唐兰； 张家志； 陈建强；

【Author】 Tang Lan, Zhang Jiazhi, Chen Jianqiang(1. China University of Geosciences, Beijing, 100083; 2. College ofResource and environment, Guangxi University, Nanning,530004;3. Guilin Institute of Technology, Guilin, 541004)

【机构】 中国地质大学地球科学与资源环境学院； 桂林工学院；

【摘要】 对阳朔一带中泥盆世东岗岭期生物礁体龙头山及阳朔大桥头生物礁组合沉积剖面进行生物地层研究表明,礁体是一个以层孔虫、珊瑚,特别是块状层孔虫为主的生物岩礁,礁核部位生物繁盛,礁体的主要造架生物以层孔虫、床板珊瑚、复体的皱纹珊瑚为主;附架生物有枝状层孔虫、单体珊瑚、腕足类及海百合类等。岩石以强烈的白云岩化为特征,使礁体生物、充填的基质不同程度白云岩化,而且生物繁盛的礁核部位白云岩化最为强烈,生物白云岩化后成“白斑”状,生物骨架岩,生物灰岩变成白斑状白云岩。更多还原

【Abstract】 The present paper describes two reef complex sections of DongGanglin Formation, in Yangshuo, Guangxi Autonomous Region, which referred to Givetian deposit based on the brachiopod Stringocephalus in abundance. Detailed interpretations and studies on the biostratigraphic feature of the two strata shows that the reefs are well developed with massive and tabular stromatoporoids, tabular and rugose coral preserved in growth position as the most important reef-builder while some of the solitary corallites, brachiopods and crinoids as the reef-liver. Most lime rocks, especially the organism frameworks in the reef core have been exposed to intensity dolomitization and changed into dolomites showring different size white spots. The white spots are actually the organism frameworks which are displaced by dolomite. The intensity of dolomitization is the strongest in the reef core and the most of the internal structures of the organism are destroyed.更多还原