| 豫西登封地区寒武系第三统鲕粒和鲕粒灰岩演化及其意义* |
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| 引用本文： | 齐永安,杨小伟,代明月,李妲,王敏,刑智峰.豫西登封地区寒武系第三统鲕粒和鲕粒灰岩演化及其意义*[J].古地理学报,2014,16(1):55-64. |
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| 作者姓名： | 齐永安 杨小伟 代明月 李妲 王敏 刑智峰 |
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| 作者单位： | 河南理工大学资源环境学院,河南省生物遗迹与成矿过程重点实验室,河南焦作 454003 |
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| 基金项目： | 国家自然科学基金项目(编号:41072003, 41102008)、河南省基础与前沿课题(编号:112300413213)和高校博士点基金博导类联合课题(编号:20114116110001)联合资助 |
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| 摘 要： | 豫西登封寒武系第三统灰岩中的鲕粒自下而上个体直径与鲕核逐渐变小、形态变得更加浑圆、鲕粒间胶结程度更高,反映了从深水不稳定鲕粒灰岩到浅水高速建造鲕粒滩的演变过程。研究区鲕粒灰岩发育可以分为3个阶段:(1)台地深斜坡鲕粒灰岩建造阶段(A段),主要发育放射鲕及同心—放射鲕,鲕粒形态多样、粒径大,粒间多为灰泥充填;(2)滩前缓斜坡鲕粒灰岩建造阶段(B段),主要发育同心—放射鲕、同心鲕,鲕粒含量极不稳定,粒径差异大,粒间由微亮晶及亮晶方解石胶结;(3)台内鲕粒滩高速建造阶段(C段), 主要发育白云化的同心鲕和微晶鲕,鲕粒含量极高、粒径极小,鲕核也很小,粒间由亮晶方解石胶结。由A段到C段,相对水深逐渐变浅,成鲕环境变得成熟而稳定,鲕粒沉积规模逐渐扩大。
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| 关 键 词： | 鲕粒 鲕粒灰岩 寒武系 第三统 张夏组 豫西 |
| 收稿时间： | 2013-03-16 |
Evolution of ooids and oolitic limestones and their significancefrom the Cambrian Series 3 in Dengfeng area,western Henan Province |
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| Qi Yong'an,Yang Xiaowei,Dai Mingyue,Li Da,Wang Min,Xing Zhifeng.Evolution of ooids and oolitic limestones and their significancefrom the Cambrian Series 3 in Dengfeng area,western Henan Province[J].Journal of Palaeogeography,2014,16(1):55-64. |
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| Authors: | Qi Yong'an Yang Xiaowei Dai Mingyue Li Da Wang Min Xing Zhifeng |
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| Institution: | School of Resources and Environment,Henan Polytechnic University,Henan Key Laboratory of Biogenic Traces and Sedimentary Minerals,Jiaozuo 454003,Henan |
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| Abstract: | The ooids have the trends to be much smaller in individual and core diameters, much rounder in shape and higher sparry cementation among ooids from bottom to top in the oolitic limestones of the Cambrian Series 3 in Dengfeng area, western Henan Province. These characteristics display the evolution from unstable oolitic limestones of deep continental shelf to much shallower high construction bank shoals. Three stages of oolitic limestones can be distinguished as follow.(1)The oolitic limestones occurred in deep platform slope are dominated by radial and tangential-radial ooids. The ooids have the big size and the higher diversity in their shapes. The filling arounding them is mostly consisted of mud.(2)The oolitic limestones occurred in oolitic shoal front of gentle platform slope contain tangential-radial and tangential ooids and have the variable oolitic content and size. The porosity among ooids occupied by microsparry and sparry calcites.(3)The high construction oolitic shoals of the platform margins are characterized by dolomitic tangential and micritic ooids and have the much higher oolitic content and much smaller size. The porosity among ooids occupied by sparry calcite. The relative water depth become much shallower, the construction environment of oolitic shoals become much perfect and stable, the thickness and distribution of oolitic shoals gradually expand the scales from Member A to Member |
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| Keywords: | C ooids oolitic limestone Cambrian Series 3 Zhangxia Formation western Henan Province |
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