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四川盆地西北部晚三叠世卡尼期的海绵斑块礁是在1975年由张长俊、朱永铭及本文作者发现的。笔者对其进行了野外及室内研究。 一、斑块礁的地质概况 已发现的斑块礁分布在四川盆地西北部龙门山山前断褶带中段的几个背、向斜两翼三叠纪卡尼期汉旺组地层中。地理位置在四川绵竹县九龙场至安县沸水场之间,沿地层走向分布范围约20余公里,垂直走向约6公里的面积上(图1)。斑块礁一般呈椭圆丘形(照片1),其两翼倾角为25°至30°礁底面直经短轴约60余米,长轴约100余米,长轴
The Late Triassic sponge patch reefs in the northwestern Sichuan Basin were discovered by Chang-Jun Zhang, Yong-Ming Zhu and the authors in 1975. I conducted a field and indoor research. First, the geological overview of patch reef Found patch reef distribution in the northwestern Sichuan Basin Longmenshan piedmont fault zone in the middle of a few back, syncline two Triassic Carnian Hanwang formation. Geographic location in Jiulong County, Sichuan Province, Kowloon to Xian boiling water market, along the stratigraphic distribution of about 20 km range, vertically to an area of about 6 km (Figure 1). The patch reef is generally oval-shaped (Photo 1). Its two wings have a dip angle of 25 ° to 30 °. The bottom of the reef is about 60 meters short of the short axis, and the long axis is about 100 meters. The long axis