焦作地区下二叠统太原组中碳酸盐岩微相类型及沉积环境  

Microfacies types and their sedimentary environments from the lower permian Taiyuan formation in Jiaozuo area

作　　者：宋慧波[1,2] 张璐[2] 牛永斌[1,2] 胡斌[1,2] 胡磊[2] 杨连超[2] 

机构地区：[1]河南理工大学资源环境学院,河南焦作454000 [2]河南省生物遗迹与成矿过程重点实验室,河南焦作454000

出　　处：《河南理工大学学报（自然科学版）》2012年第3期291-298,共8页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金资助项目(41102002);教育部高校博士点专项基金资助项目(20094116110002);河南省科技计划项目(092300410167);河南省生物遗迹与成矿过程重点实验室开放基金资助项目(OTMP0904)

摘　　要：基于对焦作地区下二叠统太原组9层灰岩中的显微观察和描述以及化石组分和岩性特征的分析,将太原组碳酸盐岩划分为15种微相类型进行系统分析,之后总结出焦作太原组碳酸盐岩微相演化特征.从太原组灰岩段中碳酸盐岩微相类型的变化规律可以看出:该组灰岩段经历了从正常天气浪基面之上的近岸浅海相带(局限台地相)变为正常天气浪基面之下的远岸浅海相带(开阔台地相),再变到近岸浅海相带,最后变为海湾-潟湖相带的发展过程;显示太原组形成时期最大海侵的层位在L4上部和L8中部,沉积底层处于还原或弱还原环境.Based on the microscopic observation and description of fossil composition and lithological features in the carbonates （together 9 beds of limestones） from the Lower Permian Taiyuan Formation, 15 carbonate microfacies types were recognized, and also, the component and development characteristics of different carbonate microfaeies was analysed and summarized in this formation. The research results indicate that all beds of limestones formed in such sedimentary environments ranging from the beginning upper shallow sea （ restricted platform ） over fair-weather wave base to the lower shallow sea or open platform under fair-weather wave base, and the turn to the upper shallow sea, finally developed in bay-lagoon facies zone, in which the was largest transgression period occurred in the upper of L4 and middle of Ls. At that time, the deposit substrate generated in the reduction setting or oxygen-poor layer.

关 键 词：碳酸盐岩 微相类型 太原组 

分 类 号：P618.13[天文地球—矿床学]