| 鄂西南下三叠统嘉陵江组二段白云岩化机制 |
| |
| 引用本文： | 胡广成,鲍志东. 鄂西南下三叠统嘉陵江组二段白云岩化机制[J]. 矿物岩石, 2011, 31(3) |
| |
| 作者姓名： | 胡广成 鲍志东 |
| |
| 作者单位： | 1. 中国石油勘探开发研究院,北京,100083
2. 中国石油大学(北京)油气资源与探测国家重点实验室,北京,102249 |
| |
| 摘 要： | 鄂西南恩施地区下三叠统嘉陵江组为碳酸盐岩沉积,发育石灰岩与白云岩的互层,通过野外观察和室内分析表明,嘉二段主要发育两种类型的白云岩,即泥晶-粉晶白云岩和砂屑白云岩。在沉积环境和岩石学特征研究的基础上,结合微量元素、碳氧同位素和阴极发光等技术,对白云岩的形成机理进行了分析。泥晶-粉晶白云岩发育有鸟眼构造、窗格构造和石膏假晶等暴露沉积特征,有序度低,白云石发红色光、紫红色光,与准同生白云岩化作用有关;砂屑白云岩有序度高、Mn和Fe含量高、Na含量和Mn/Sr小,具有较负的δ18 O值和较正的δ13 C值,形成于受大气淡水影响的氧化环境,砂屑发紫红色光,与混合水白云岩化作用有关;同时,部分砂屑白云岩的Sr含量异常也揭示了其叠加了埋藏白云岩化作用,白云岩化流体来自其上覆和/或下伏泥晶-粉晶白云岩中的富Mg2+卤水。
|
| 关 键 词： | 白云岩化 下三叠统 嘉陵江组 微量元素 碳氧同位素 阴极发光 鄂西南 |
ORIGIN OF DOLOMITE IN THE SECOND MEMBER OF JIANLINGJIANG FORMATION OF LOWER TRIASSIC,SOUTHWESTERN HUBEI PROVINCE,CHINA |
| |
| HU Guang-cheng,BAO Zhi-dong. ORIGIN OF DOLOMITE IN THE SECOND MEMBER OF JIANLINGJIANG FORMATION OF LOWER TRIASSIC,SOUTHWESTERN HUBEI PROVINCE,CHINA[J]. Journal of Mineralogy and Petrology, 2011, 31(3) |
| |
| Authors: | HU Guang-cheng BAO Zhi-dong |
| |
| Affiliation: | HU Guang-cheng1,BAO Zhi-dong2 1.Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China,2.State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249 |
| |
| Abstract: | The Jialingjiang Formation of Lower Triassic in the southwestern Hubei Province consists primarily of carbonate rocks characterized by limestone interbedded with dolomite.According to field outcrop investigation and laboratory analysis,the dolomite has been divided into micritic dolomite and doloarenite respectively.Based on the study of petrological characteristics,combined with the research of cathodoluminescence and geochemical properties of trace elements,carbon and oxygen isotopes,the genesis of dolomi... |
| |
| Keywords: | dolomitization Lower Triassic Jialingjiang Formaiton trace elements carbon and oxygen isotope cathodoluminescence southwestern Hubei Province |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
