辽南新元古界“震旦系兴民村组”解体及沉积环境分析  

Disintegration and Sedimentary Environment Analysis of the Originally-Define‘Xingmincun Formation of Neoproterozoic Sinian System’in South Liaoning

作　　者：曹煜昊[1,2] 田德欣 卢崇海 邵九龙 CAO Yu-hao;TIAN De-xin;LU Chong-hai;SHAO Jiu-long(School of Resources&Civil Engineering,Northeastern University,Shenyang 110819,China;Liaoning Institute of Mineral Exploration,Shenyang 110031,China;Non-Ferrous Metals Geological Exploration Bureau of Zhejiang Province,Shaoxing 312000,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]辽宁省矿产勘查院,辽宁沈阳110031 [3]浙江省有色金属地质勘查局,浙江绍兴312000

出　　处：《东北大学学报（自然科学版）》2020年第8期1188-1194,共7页Journal of Northeastern University(Natural Science)

基　　金：辽宁省地质调查勘察局项目(辽地科【2016】04号).

摘　　要：通过对原划“震旦系兴民村组”的研究,于原划兴民村组周家崴子段底部石英砂岩中发现冰筏坠石和细纹层构造等冰期环境的特征,在该段下部和中上部见有冰晶痕、雹晶痕等冰碛作用遗迹.原划兴民村组王家坦子页岩段属于浅海相开阔陆棚亚相沉积环境,并归属到震旦系.该层位所产的水母化石纹饰结构简单,个体极小,其形成时代应早于埃迪卡拉纪.原划兴民村组干岛子灰岩段属于内源碳酸盐沉积.鉴于上述研究,有必要对原划分兴民村组进行解体,划为南华系上统周家崴子组、王家坦子组和干岛子组三个组级单位,这样有利于我国新元古代晚期各岩石地层单位的对比与研究.Based on the authors’study on the original-define‘Xingmincun Formation of Sinian System’,the characteristics of the glacial period environment were found in the fine grain quartz sandstone in the bottom of Zhoujiawaizi section of Xingmincun Formation,such as ice-rafting dropstone and fine laminary structure.In the bottom and upper part of Zhoujiawaizi section there are ice crystal impression and hailstone traces and other moraine traces.The Wangjiatanzi shale section of the original-define Xingmincun Formation belongs to the shallow sea facies open shelf subfacies sedimentary environment,producing different species of the medusa-like fossil which belong to the Sinian system.The structure of the medusa-like fossils produced in this layer is simple and small and the formation time should be earlier than that of Ediacaran.The Gandaozi limestone section of Xingmincun Formation belongs to the internal carbonate deposit.In view of the above research results,the authors consider that the sedimentary environment of the Zhoujiawzi sandstone,Wangjiatanzi shale and Gandaozi limestone of the original-define Xingmincun Formation is obviously different.It is necessary for original division of Xinmincun Formation to be disintegrated and divided into Zhoujiawaizi Formation,the Wangjiatanzi Formation and the Gandaozi Formation in the upper series of the Nanhua System.It is beneficial to the comparison and study of lithostratigraphy units in the late Neoproterozoic in China.

关 键 词：震旦系兴民村组 冰筏坠石 纹层状构造 冰晶痕 雹晶痕 类水母化石 

分 类 号：P534.3[天文地球—古生物学与地层学] P539.2[天文地球—地质学]