| 测老庙坳陷早白垩世巴音戈壁组叠锥构造特征及其环境解释 |
| |
| 引用本文： | 宋霁,焦养泉,李锦华.测老庙坳陷早白垩世巴音戈壁组叠锥构造特征及其环境解释[J].地球科学,2015,40(5):851-862. |
| |
| 作者姓名： | 宋霁 焦养泉 李锦华 |
| |
| 作者单位： | 中国地质大学构造与油气资源教育部重点实验室，湖北武汉 430074 |
| |
| 基金项目： | 国家重点基础研究发展计划“973”项目，国家自然科学基金项目 |
| |
| 摘 要： | 为了全面了解测老庙坳陷早白垩世叠锥构造的沉积特征，并探讨其成因及形成环境等问题，运用野外露头实测、光薄片观察、X射线衍射分析、阴极发光照相、扫描电镜照相等方法，发现叠锥构造发育于钙质结核外侧，覆盖所有方向，呈放射状，直圆锥锥顶指向结核中心；叠锥矿物成分主要为纤维状低镁方解石，纤维状方解石呈锥形套叠，具波状消光；阴极发光显微镜下呈均一的棕红色，不具微量元素分异和析出的成岩色带；叠锥结核的发育规模明显受制于原生沉积环境.结果表明叠锥结核的发育具有明显的阶段性；其发育的原生沉积环境应为水深在5~30 m、水体能量较高的滨浅湖沉积环境.推测叠锥构造的形成可能是同沉积期生物沉积作用和胶结作用，以及后期上覆岩层静压力共同作用的结果.
|
| 关 键 词： | 叠锥 巴音戈壁组 测老庙坳陷 沉积学 环境地质 |
| 收稿时间： | 2014-11-03 |
Characteristics and Environmental Interpretation of Cone-in-Cone Structure,Early Cretaceous Bayingebi Formation,Celaomiao Depression |
| |
| Song Ji,Jiao Yangquan,Li Jinhua.Characteristics and Environmental Interpretation of Cone-in-Cone Structure,Early Cretaceous Bayingebi Formation,Celaomiao Depression[J].Earth Science-Journal of China University of Geosciences,2015,40(5):851-862. |
| |
| Authors: | Song Ji Jiao Yangquan Li Jinhua |
| |
| Abstract: | To better understand the sedimentary characteristics of the cone-in-cone structure in the outcrop areas, and to explore the causes of the formation and the environmental issues of the cone-in-cone structure, we employ methods such as outcrop measure, polished thin section observation, X-ray diffraction analysis, cathode-ray luminescence, electronic scanning in this study. It is discovered that cone-in-cone structure develops radially around the calcareous concretions, with conical apex pointing straight to the concretion center; the major mineral composition of cone-in-cone structure is fibrous low magnesium calcite, with fibrous calcite crystals being cone-shaped nest, with wavy extinction which appears uniform red-brown under cathodoluminescence microscopy without diagenetic ribbon with trace element fractionation and precipitation. The developing scale of cone-in-cone concretions is in the control of primary sedimentary environment obviously. It is considered that the growth of cone-in-cone concretions has distinct stages; the original sedimentary environment should be shallow lake sedimentary environment with about 5-30 m depth and relatively higher energy. It is concluded that the formation of cone-in-cone structure is a result of synsedimentary biological deposition, cementation and later overburden static pressure. |
| |
| Keywords: | cone-in-cone Bayingebi Formation Celaomiao depression sedimentology environmental geology |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《地球科学》浏览原始摘要信息 |
| 点击此处可从《地球科学》下载免费的PDF全文 |
