华北地块东南缘上元古界风暴沉积  

Storm-Deposits in Upper Proterozoic in Southeastern Huabei Sino-Forean Massif

作　　者：王翔[1] 王战[1] 

机构地区：[1]西安地质学院地质构造研究所

出　　处：《沉积学报》1993年第2期91-98,共8页Acta Sedimentologica Sinica

基　　金：地矿部资助的"华北地块南缘元古宙构造演化"项目

摘　　要：本文对华北地块东南缘上元古界中新近发现的风暴沉积层位进行了研究,并划分出九种风暴沉积剖面结构和三种有关的沉积环境。结论认为,本区刘老碑组风暴岩形成于潮下开阔陆棚环境,倪圆组风暴沉积形成于台地边缘斜坡环境,而望山组风暴沉积属湖下局限台地相产物。The area of northern Jiangsu and Anhui provinces locates on the southeastern edge of Huabei massif (Sino-Korean massif),and is one of the key areas for the division and correlation of Upper Proterozic in China. Since late 80's,some geologists have reported or studied some storm-deposits of the Upper Proterozoic (Ge Ming et al. ,1987;Qiao Xiufu ,1987;Qiao Xiufu et al. ,1989). However,their researches are concerning only on the storm-deposit levels in Zhangqu Formation and Weiji Formation. Through the research in this area during recent years,the authors have discovered some storm-deposits in Liulaobei Formation,Niyuan Formation, and Wangshan Formation in the Upper Proterozoic. This paper is mainly carried out to approach the characteristics of the newly recognized storm-deposits in some aspects such as types of the tempestites,storm-generated sedimentary structures, sectional textures of tempestites, and sedimentary environment of tempestites. According to our research,the major rock types of the storm-deposits include autochthonous calcirudite,allochthonous calcirudite, turbidite-generated calcisiltite and micritic limestone, etc. Storm-generated sedimentary structures include different scour or truncation structures (e. g. , flate , wave-like, complex and irregular, etc. );hummocky cross-stratification (which can be clasificlassified into two types; simple and complex); swaley cross-stration, swaley cross-stration ,and thin graded bed. Moreover,the sectional texture of the newly recognized storm-deposits can be classified into 9 types. Most of them are incomplete,and some of them belong to complex ones,which mean the existence of episodical storm activity. The sedimentary environment of tempestites,we think,includes three types:subtidal zone in open shelf, plateform edge gentle ramp,and subtidal zone in confied plateform.

关 键 词：上元古化 风暴沉积 剖面结构 地块 

分 类 号：P512.21[天文地球—地质学]