贵州紫云二叠纪生物礁的基本特征及其发育规律

贵州紫云二叠纪生物礁是我国二叠纪发育最好的生物礁之一。该地区生物礁包括茅口阶堤礁、吴家坪阶珊瑚层、长兴阶堤礁和点礁。本文通过大比例尺地质填图和剖面测量，系统地研究了该地区生物樵的沉积学特征和古生物学特征，建立了成因模式。研究结果表明，紫云二叠纪生物礁类型较多。礁组合相带齐全，礁骨架结构极为典型，古岩溶十分发育。生物礁发育程度具有明显的旋回性，海平面的相对变化和古气候是控制生物礁发育的主要因素。

The Characteristics and Development of the Permian Reefs in Ziyun County,South Guizhou,China

The Pemian reefs in Ziyun County,Guizhou, are among the best developed reefs in South China. The horizon of these reefs ranges from the Middle Permian Maokun to the uppermost Permian Changxingian. Except the Upper Permian Wujiapingian coral biostromes, the main reef building organisms include calcisponges, hydrozoans, blyozoans, and the enerusting alga Archaeolithoporella. The facies difference is very distinct. Especially the Changxingian reef complex,including backreef skeletal sand facies, reefcore facies, forereef slope facies, and basin f acies, can be observed in a distance less than fi kilometers from north to south. Well de-veloped reefs exist in the highstand systems tracts of each depositional sequence. Relative changes of sealevel and paleoclimate are believed to be the fundamental control factors on the development of the reefs.