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1985年11月中旬,西南石油学院强子同老师等13人在邻水椿木坪,对上二叠统长兴组生物礁进行了实地考查,确认其为海绵-水螅生物礁。六月,省地质学会煤田专业委员会又组织考查,初步认为它可能是生物礁。生物礁的主要造架生物有:钝管海绵、纤海绵、水螅、苔藓虫、刺毛藻(Tabulozoa)等。料结生物主要为蓝绿藻。附礁生物以腕足、棘皮为主。礁核发育在长兴组中上段。除骨架岩外,还见少量礁角砾岩、海百合颗粒岩。它与北碚老龙洞长兴组生物礁相比,礁核厚度更大。礁体的盖层为(云化)层状海百合颗粒岩。
In mid-November 1985, 13 people, including the hadron and the teacher at the Southwest Petroleum Institute, conducted a field survey on the reef in the Changxing Formation of the Upper Permian at Pengshui County, adjacent to Shuimu, and confirmed it as a sponge-reef reef. In June, the Provincial Geological Society of coal professional committee also organized examination, initially that it may be reefs. The main creatures of reefs include: obturator sponge, sponge sponge, Hydra, bryozoa, Tabulozoa and others. Feed knot mainly blue-green algae. Reef creatures with brachiopod, echinodermis-based. Reef nuclear development in Changxing group in the upper section. In addition to the skeleton rock, but also see a small amount of reef breccia, sea lily granulite. Compared with the reefs of Changxing Formation in Beilongqu, Beibei, the reef cores are thicker. The reef cover is (cloud) stratiform sea lily granulite.