兴蒙地区早二叠世碳酸盐岩建造研究

Xing-Meng area was the transitional region between tropical Tethyan domain and subtropical Pangean domain during Early Permian. The profound understanding of carbonate buildups from Xing-Meng area can provide new materials and knowledge for the further study of palaeogeographic distribution model, evolution pattern and controlling factors of Early Permian carbonate buildups around the world. However, the researches on Early Permian carbonate buildups from Xing-Meng area still have some problems: low research degree on construction model, controversies concerning palaeogeographic distribution model and its controlling factors, and unknown of evolution pattern and its controlling factors. This project is to describe the sedimentary characteristics of Early Permian carbonate buildups in the Amushan Formation from Xing-Meng area in order to examine the biological contributions and growth sequences, and then focus on the construction models and evolution pattern of Early Permian carbonate buildups. We will further systematically compare Early Permian carbonate buildups from Xing-Meng area with tropical Tethyan and subtropical Pangean buildups in terms of construction model, biological compositions, and evolution pattern. Finally, this project is going to explore the palaeogeographic distribution model, evolution pattern and controlling factors of Early Permian carbonate buildups on a global scale.

在早二叠世期间，兴蒙地区处于热带特提斯域和亚热带泛大陆域的过渡区域。该区域碳酸盐岩建造的深入理解能为全球早二叠世碳酸盐岩建造的古地理分布模式、演化规律及其控制因素的深入研究提供新的资料和认识。然而，兴蒙地区早二叠世碳酸盐岩建造的生长模式研究程度低、古地理分布及其控制因素存在争议、演化规律及其控制因素尚不清晰。本项目拟以兴蒙地区阿木山组早二叠世碳酸盐岩建造为研究对象，采用沉积学的方法，揭示碳酸盐岩建造的生物面貌，分析生物群落功能，恢复建造模式和演化规律。在生物组成、建造模式和演化规律上，系统地对比兴蒙地区早二叠世碳酸盐岩建造与热带特提斯建造和亚热带泛大陆建造的异同，探讨全球早二叠世碳酸盐岩建造的古地理分布模式、演化规律及其控制因素。

早二叠世是晚古生代大冰期结束、气候变暖的关键时期；在此期间，碳酸盐岩建造的建造生物也发生了显著变化。早二叠世期间，兴蒙地区处于热带特提斯域和亚热带泛大陆域的过渡区域，对该区域内碳酸盐岩建造生长模式和演化规律的研究可以很好地反映环境变化与生命演化的相互作用关系，对于深入探讨全球早二叠世碳酸盐岩建造的古地理分布、演化规律及其控制因素具有重要的地球生物学意义。. 本项目以兴蒙地区早二叠世的叶状藻-微生物礁、生物碎屑-微生物灰泥丘和生物碎屑灰泥丘为研究对象，利用沉积学、埋藏学和古生态学方法，探讨了叶状藻和微生物以及棘皮、有孔虫和管壳石等其他生物在上述碳酸盐岩建造形成过程中的作用，进而恢复了它们的生长模式和演化规律；系统地对比了兴蒙地区、热带特提斯域和亚热带泛大陆域碳酸盐岩建造在生物组成、建造模式和演化规律等方面的异同，揭示了早二叠世全球碳酸盐岩建造的古地理三分模式和三阶段演化规律，探讨了其与冰期末期气候变化的相互关系，恢复了当时的地球生物学过程。