中文摘要：

在龙门山前缘地区的上三叠统卡尼阶为海相沉积，整体以下部浅灰色、灰色鲕粒灰岩、海绵礁障积灰岩向上部的深灰色、灰黑色泥页岩、泥质粉砂岩的岩性、颜色突变为显著特征。在安县雎水、绵竹汉旺一带，在卡尼阶碳酸盐沉积的上部，多见海绵生物灰岩，在地表形成带状分布的海绵点礁（丘）群。通过对雎水地区海绵生物礁和江油马鞍塘、广元上寺、绵竹汉旺等剖面对应层位的野外实地调查和显微薄片分析，认为龙门山前缘的卡尼阶海绵等生物，生长在古地形复杂、水体能量低的较深水区域，海绵礁被卡尼期晚期沉积的黑灰色泥（页）岩、泥质粉砂岩所覆盖，二者界限明显，这套深色岩石在全区分布稳定；在上覆的泥质粉砂岩中见植物茎干及植物叶片化石。结合区域地质资料和阿尔卑斯等地研究资料，认为雎水等地的海绵死亡反映了卡尼期洪水事件，与构造运动有关的陆源物质的大量供给和巨型季风气候对卡尼期海绵礁（丘）的死亡负有主要责任。

英文摘要：

The Upper Triassic Carnian marine sediments show the tinctorial and lithological change from grey ooides, sponge reef limestone to dark grey, grayish black shale, peliticsiltstone in the frontal region of the Longmenshan Mountains. In Jushui of Anxian and Hanwang of Mianzhu, a set of carbonate deposits developed in the Carnian of Ma＇antang Formation. Among them the Hexactinellida biolithite is found and formed the sponge reef groups of the belt-shaped distribution. Through field study of the sponge reefs in .Jushui of Anxian and the sections in Ma＇antang of Jiangyou, Shangsi of Guangyuan and Hanwang of Mianzhu, the authors think that the sponge reefs in the frontal region of the Longmenshan Mountains grew in the deeper water body with complex landform and with low energy. In the Longmenshan Mountain area, the sponge reefs are overlain by black mudstone （shale） and silty mudstone and the boundary is obvious. This set of Carnian mudstone is distributed stably over West Sichuan and implicates the Carnian Pluvial Event. The death of the sponge in the Jushui area was triggered by this event which was influenced by megamonsoon and the input of terrigenous materials.