| 内蒙古南部石炭—二叠纪陆缘生物礁及其建造环境 |
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| 引用本文：田树刚,翟大兴,范嘉松.2019.内蒙古南部石炭—二叠纪陆缘生物礁及其建造环境[J].地球学报,40(6):781-794. |
| DOI：10.3975/cagsb.2019.061201 |
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| 基金项目:国家自然科学基金项目(编号: 41472027; 41572098);中国地质调查局地质调查项目(编号: DD20160168) |
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| 中文摘要:内蒙古南部发现大量石炭—二叠纪陆缘生物礁(阿木山组、三面井组和林西组)。本文在深入研究含礁地层、沉积相序和造礁环境的基础上, 识别研究区三种板块边缘生物礁建造体系, 即陆缘碳酸盐台地、简单火山岛弧与复合火山岛弧。按礁体形态结构、古地理位置和成因机制, 将生物礁分为多种类型, 包括层礁、点礁、堤礁、圆丘礁、锥礁、塔礁和柱礁。综合分析沉积类型、造礁生物(蓝细菌、钙藻和苔藓虫等)和古地貌特征, 进一步划分生物礁建造古地理单元, 即近岸-潮坪、泻湖、礁滩障壁、火山岛弧、弧前与弧后盆地、弧前三角洲和外侧岛弧。最终统计各单元生物礁发育, 建立古地理分布模式。成果对促进生物礁基础研究, 及恢复华北板块北缘古地理环境和大地构造演化提供可靠证据。 |
| 中文关键词:陆缘生物礁 造礁环境 石炭—二叠纪 内蒙古南部 |
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| Land-marginal Reefs and Building Conditions in Carbonaceous–Permian Strata, Southern Inner Mongolia |
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| Abstract:A lot of land-marginal reefs have been recently discovered in the Carbonaceous-Permian strata in southern Inner Mongolia, which include the Amushan Formation, Sanmianjing Formation and Linxi Formation. On the basis of detailed study of reef-strata, faces sequences and reef-built conditions, three land-marginal reef-built systems have been distinguished, i.e., land-marginal carbonate terrace, simple volcano-arc system and compound volcano-arc system. According to morpho-textures, palaeo-geographic positions and reef-built machines, these land-marginal reefs could be divided into several types, namely. stratigraphic form reefs, patch reefs, barrier reefs, knoll reefs, taper reefs, tower reefs and column reefs. According to summing up data about stratigraphic characteristics and morphologic functions of reef-built organisms such as blue germs, calcium algae and bryozoan, some palaeo-geographic units of plat-form margins are distinguished, which are off-shore tidal-flat, lagoon, reef-beach barrier, back-arc basin, volcano-arc, alter-arc delta, alter-arc basin and outside-arc. Three spreading models of land-marginal reefs are erected by studying reef-growing on each unit. These results will prove reliable evidence for promoting reef study, restoring land-marginal conditions and tectonic evolution. |
| keywords:land-marginal reefs building conditions Carbonaceous–Permian southern Inner Mongolia |
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