【摘要】 川西上三叠统马鞍塘组的硅质海绵生物礁沿龙门山带出露,前人已对其岩性、化石、分布及控制因素作了一定研究。将出露礁体的分布及岩性特征与欧洲硅质海绵礁对比,进一步结合全球海绵—珊瑚礁的演化特征和川西地震剖面中似礁的丘形隆起现象,认为川西地区在晚三叠世早期发育硅质海绵—珊瑚礁系列,其中硅质海绵礁发育在较深水环境,现今部分被后期龙门山冲断带推覆至地表;含珊瑚的礁体发育在相对浅水、高能环境,现今位于川西凹陷中;硅质海绵礁的展布范围受北面秦岭古陆的碎屑物注入影响,沿龙门山方向向北逐渐变小;高能礁体发育在川西拗陷至川中古隆起的过渡带上,远离北面物源。对于揭示川西地区海相碳酸盐岩到碎屑岩的转变过程及马鞍塘组的油气勘探具有重要意义。更多还原

【Abstract】 Siliceous sponge reefs have been revealed in the upper Triassic Ma’antang Formation in western Sichuan. The lithology,fossils,distribution and controlling factors of those reefs have been researched,but can be studied in a deep-going way. Comparing those reefs and the upper Jurassic siliceous reefs in Europe,it is considered that a series of sponge and coral may exist in the western Sichuan,according to the evolution of the global siliceous reefs and the colliculus uplift in the seismic profiles. The siliceous reefs developed in the relatively deep water and the low energy environment,which had been exposed by late tectonic movements. While the predicted reefs may develop in the shallow water and relatively high energy environment,which have been deeply buried in the depression of the western Sichuan Basin. And the distribution of the siliceous reefs is obviously influenced by the Qinlin Old land, whose size turned smaller northwardly. This is of significant for understanding the transfer process frome the marine carbonate to the marine clastic rock and the oil exploration direction in the Ma’antang Formation.更多还原