【摘要】 在巴颜喀拉盆地西段黄羊岭组中发现了一个长约3km、厚约1295m的玄武岩+碳酸盐岩的隆起建造,具有3个由玄武岩基底加碳酸盐岩盖层组成的双层剖面结构。隆起建造中海相沉积物由下至上从深海相渐变为浅海相,生物化石由浮游生物组合演变为浅海造礁生物组合。通过与现代海山的对比,证实巴颜喀拉西段发现的隆起建造属古海山堆积,根据化石的时代确定其为中二叠世的古海山,暗示巴颜喀拉盆地在中二叠世以前存在一个古大洋,其后古大洋逐渐俯冲消减,演化为残留洋盆地,这对巴颜喀拉盆地地质构造演化的研究和构造属性的厘定具有重要意义。更多还原

【Abstract】 An uplift made up of basalt and carbonate rocks ～3 km long and ～1295 m thick is found in the Huangyangling Formation in the western segment of the Bayan Har basin. The uplift has three double-layered structures composed of basalt basement and carbonate cover. In the uplift, from the base upward marine sediments change gradually from abyssal to neritic facies, and fossils evolve gradually form abyssal plankton assemblages to neritic reef-building organism assemblages. Its comparison with modern seamounts demonstrates that the uplift found in the western segment of the Bayan Har basin is paleo-seamount deposits. According to the age of its contained fossils, the age of the paleo-seamount is determined to be Middle Permian, which implies that: there existed an paleo-ocean in the western segment of the Bayan Har basin before the Middle Permian, and afterwards the paleo-ocean was subducted and consumed gradually and evolved into a remnant oceanic basin. The authors think that the discovery of the Permian paleo-seamount in the western segment of the Bayan Har basin has great significance for the study of the tectonic evolution and tectonic character of the Bayan Har basin.更多还原