ORDOVICIAN PALEOGEOGRAPHY IN HELAN AULACOGEN
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摘要: 通过大量野外地质工作,结合测井资料,分析认为,贺兰坳拉谷以浅海碳酸盐沉积为主,其次可见碎屑岩、火山碎屑岩等,以碳酸盐岩占绝对优势。主要的碳酸盐岩类型为泥晶灰岩、泥质灰岩、鲕粒灰岩、竹叶状灰岩及晶粒白云岩、泥质白云岩,局部地区可见叠层石灰岩及云斑灰岩等。泥云坪、局限台地、开阔台地、浅海陆棚、海底扇等为典型沉积相类型。贺兰坳拉谷奥陶纪沉积相模式由陆向海可表示为大陆区-潮坪区-局限台地-开阔台地-台地边缘-浅海陆棚。Abstract: Shallow marine carbonates dominate the Ordovician of the Helan Aulacugen, with clastic and pyroclastic rocks as the second. In the carbonate deposits, there are micritic limestone,argillaceous limestone, oolitic limestone, calcirudite, crystalline dolostone and argillaceous dolostone. Stromatolite and cloudy limestone occur in some areas. They were formed in a variety of environments, such as the mud-dolomite tidal flat, restricted platform, open-platform, shelf and submarine fan in an succession from land to sea.
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Key words:
- Helan Aulacogen /
- Ordovician /
- Lithofacies and paleogeography
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