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作者自1975年以来对川西北晚三叠世海绵点礁的分布作了详细的普查,并进行了野外及室内岩石学、古生态及沉积相的初步研究。本文只涉及对点礁组合的岩石学方面的初步认识。一、点礁组合的地质简况这一海绵点礁组合分布于四川盆地西北部绵竹县及安县一带(图1),其层位属于上三叠统卡尼阶汉旺组,造礁生物主要是海绵,粘结生物是蓝—绿藻。礁的高度一般
The authors have conducted a detailed survey of the distribution of the spontaneous reefs in the Late Triassic during the Late Triassic period in northwestern Sichuan since 1975 and conducted a preliminary study on the field and interior petrology, palaeo-ecology and sedimentary facies. This article only deals with the initial understanding of the petrology of the reefs. I. Geological Profile of Point-Reef Combination The sponge point-reef combination is distributed in the area along Mianzhu County and An County in the northwestern Sichuan Basin (Figure 1). The strata belong to the Hann Group of the Upper Triassic Carney, and the reef-building organisms are mainly Sponge, sticking organisms are blue - green algae. Reef height in general