河南嵩山地区新元古界何家寨组微亮晶(臼齿)碳酸盐岩成因新认识  

New understanding on the genetic mechanism of microsparite( molar-tooth) carbonates in the Neoproterozoic Hejiazhai Formation in Songshan area,Henan Province

作　　者：王振涛[1] 李现根[2] Wang Zhen-Tao;Li Xian-Gen(MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,CAGS,Beijing 100037,China;Offshore Oil Production Plant of Sinopec Shengli Oilfield Company,Shandong Dongying 257237,China)

机构地区：[1]中国地质科学院矿产资源研究所自然资源部成矿作用与资源评价重点实验室,北京100037 [2]中石化胜利油田分公司海洋采油厂,山东东营257237

出　　处：《古地理学报》2020年第1期56-74,共19页Journal of Palaeogeography：Chinese Edition

基　　金：国家重点研发计划课题(编号:2017YFC0602704);国家自然科学基金项目(编号:40572073)联合资助~~

摘　　要：作为国际前寒武系碳酸盐岩研究的热点,微亮晶(臼齿)碳酸盐岩(简称MT)在前寒武纪古地理重塑、地层对比和古气候研究等方面具有重要研究意义,但对其成因机制的认识长期存在争论。华北克拉通南缘嵩山地区新元古界何家寨组发育大量MT沉积,被前人解释为地震液化的产物。文中对何家寨组MT发育层位进行了详细的形态描述、系统的微相分析和比较沉积学的研究,确定何家寨组MT沉积于碳酸盐缓坡沉积环境,发现MT具有早期成岩作用特征,其形态类型和宿主岩性、沉积环境之间存在密切关系。从多个方面对比探讨了MT微亮晶和地震“液化脉”之间的不同,明确指出,何家寨组MT的形成受到古海洋条件和沉积岩相的严格约束,具有鲜明的古环境意义,和地震没有必然的成因联系。As an international research focus on the Precambrian carbonate rocks,the microsparite(molar-tooth)carbonate(MT for short)is of great significance in the reconstruction of palaeogeography,stratigraphic correlation and palaeoclimate,but its formation mechanism has been debated for a long time.The Neoproterozoic Hejiazhai Formation in Songshan area,which is located at the southern margin of North China Craton,is characterized as a large number of MT deposits that were interpreted as the product of seismic liquefaction.In this paper,based on the MT-containing strata of the Hejiazhai Formation,detailed studies include the morphology of MT,microfacies and sedimentary environment were carried out.Results show that the Hejiazhai Formation MT formed in the carbonate ramp environment and it owes early diagenetic features.The morphology of MT has a strong relationship with the lithology of the host rocks and the sedimentary environments.Besides,the differences between the MT and“liquefied vein”triggered by earthquake were compared from several aspects.Through the above work,we clearly pointed out that the Hejiazhai Formation MT is mainly constrained by the palaeomarine conditions and sedimentary microfacies,and it is a good indicator of the ancient environment,but has no relationship with the earthquakes.

关 键 词：嵩山地区 何家寨组 臼齿碳酸盐岩 地震液化脉 

分 类 号：P583[天文地球—岩石学]