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| 贵州施秉云台山白云岩类型、碳氧同位素组成及沉积环境 |
| The Type, Carbon and Oxygen Isotopic Composition, and Sedimentary Environment of Dolomites in Yuntaishan, Shibing County, Guizhou Province |
| 投稿时间：2013-11-06 修订日期：2014-01-08 |
| DOI： |
| 中文关键词: 白云岩;碳氧同位素;沉积构造;沉积环境;云台山 |
| 英文关键词: dolomite;carbon and oxygen isotopes;depositional structure;sedimentary environment;Yuntaishan,Shibing County;Guizhou Province |
| 基金项目:贵州省科技计划项目(黔合SY字(2012)161);矿床地球化学国家重点实验室项目群项目(SKLODG-ZY125-08);西南岩溶区重要地层剖面调查项目(121201140700001)。 |
| 作者 | 单位 | E-mail | | 谯文浪1, 肖加飞2, 陈武1, 李艳桃2, 唐佐其1, 马义波1 | 1. 贵州省地质调查院, 贵阳 550005
2. 中国科学院地球化学研究所矿床地球化学国家重点实验室, 贵阳 550002 | xiaojiafei5@163.com |
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| 中文摘要: |
| 云台山景区位于贵州省东部的施秉县,是世界自然遗产提名地,发育白云岩喀斯特地貌。景区白云岩不仅是形成景观的物质基础,而且蕴含着丰富的岩石学、沉积学及地球化学信息。景区白云岩为准同生成因,岩石类型多样,主要有粉-微晶白云岩、不等晶白云岩、细-粉晶藻砂屑白云岩、层纹-条纹-条带-薄层状藻砂屑微-泥晶白云岩、亮-泥晶藻鲕粒藻砂屑白云岩及角砾状泥晶白云岩等6类。白云岩的δ13C值变化在-1.81‰~1.44‰之间,平均值-0.78‰;δ18O值变化在-7.39‰~-4.1‰之间,平均值-5.11‰。白云岩的沉积构造,既有层理构造,也有层面构造。层理构造主要有水平层理和水平条带层理,层面构造有对称波痕、不对称波痕及叠置波痕。景区白云岩的类型、结构、沉积构造及碳氧同位素组成特点所反映的沉积环境为局限碳酸盐台地,其水体较浅,但咸化程度高,水动力强度弱-中等。 |
| 英文摘要: |
| The Yuntaishan scenery is situated in Shibing County, eastern Guizhou Province, where there is developed a karst landform of dolomite. Dolomites in the scenery area are not only the material basis for the formation of landscape, but also contains abundant information about petrology, sedimentology and geochemistry. The dolomites are penecontemporaneous, diverse in type, which are mainly powder-microcrystalline dolostone, unequal crystal dolostone, fine-powder crystal alga arenitic dolostone, laminated-striped-thin layered alga arenitic micro-micritic dolostone, bright-micrit alga ooid-arenitic dolostone and micritic dolomite breccia. The carbon and oxygen isotopic compositions of the dolomites were studied, and the results indicated that the δ13C values vary from -1.81‰ to 1.44‰, with an average value of -0.78‰;the δ18O values vary between -7.3‰ and -4.1‰, with an average value of -5.11‰. The dolomites exhibit both intrastratal structure and bedding plane structure, with the former being mainly horizontal bedding and horizontal strip bedding and the later being para-ripple, asymmentrical ripple mark and superimposed ripple mark. The sedimentary environment of the dolomites was a restricted carbonate platform as shown by their types, textures, sedimentary structures, carbon and oxygen isotopic compositions. The sedimentary environment is characterized by shallow water, relatively high salinity and weak to moderate hydrodynamic intensity. |
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