黔东北寒武系牛蹄塘组沉积学特征及沉积环境演化

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英文篇名：Sedimentology Characteristics and Sedimentary Environment Evolution in Niutitang Formation of Cambrianin Northeast Guizhou 作者：唐佐其 ; 刘凌云 ; 谯文浪 ; 陈武 ; 华兴 ; 吕留彦 ; 马义波 英文作者：TANG Zuo-qi;LIU Ling-yun;QIAO Wen-lang;CHEN Wu;HUA Xing;LV Liu-yan;MA Yi-bo;Guizhou Geological Survey;Guizhou Research of Geologyand Geophysical prospecting devecoped and Applied Engineering Technology;Cademician Workstation,Guizhou Geological Survey;102 Geological Party,Guizhou Bureau of Geology and Mineral ExploraTion and Development; 关键词：黔东北 ; 牛蹄塘组 ; 微量元素 ; 沉积环境演化 英文关键词：Northeast guizhou;;Niutitang formation;;Traceelement;;Sedimentary environment evolution 中文刊名：GZDZ 英文刊名：Guizhou Geology 机构：贵州省地质调查院贵州省地质物探开发应用工程技术研究中心贵州省地质调查院院士工作站;贵州省地矿局102地质大队; 出版日期：2019-03-15 出版单位：贵州地质 年：2019 期：v.36;No.138 基金：中国矿产地质志项目(DD20160346、DD20190379);; 贵州省地矿局科研项目(黔地矿科合[2012]16号、黔地矿科合[2017]29号) 语种：中文; 页：GZDZ201901007 页数：8 CN：01 ISSN：52-1059/P 分类号：63-70

摘要

通过对黔东北松桃-江口地区寒武系牛蹄塘组调查研究及系统的样品控制,以岩石学、层序地层学、微量元素地球化学为技术手段,研究发现该组地层岩石主要为富含炭质细碎屑岩组合,沉积构造丰富,识别出该地层组为完整的三级层序,自下而上可进一步划分为盆地-大陆斜坡-深水陆棚相沉积。微量元素总体上富亲铜、亲铁元素,贫亲石元素;以V、Ni、Mo、Re、As、Cd、U元素丰度及U/Th、δU、V/(V+Ni)、V/Cr、Ni/Co比值指标证实研究区牛蹄塘组中下部沉积条件均位于氧化界以下,属于贫氧-厌氧还原环境,为区域上V、Mo等元素的超常富集提供必要条件,至本组上部为贫氧-弱氧化环境,划分出Ⅶ个氧化还原幕次,细化了研究区牛蹄塘组沉积环境条件及其演化特征。
        Field investigation and systematic sampling of the Niutitang formation of the Cambrian system in Songtao-Jiangkou area of northeast Guizhou were conducted,Petrologic sequence stratigraphy and trace element geochemistry are the technical means,It is found that the stratigraphic rocks in this group are mainly composed of carbonaceous fine clastic rocks,The formation is identified as a complete three-level Sequence,From bottom to top,it can be divided into basin slope,continental slope and deep water shelf facies.The trace elements are rich in copper and iron,and poor in stone,It takes V、Ni、Mo、Re、As、Cd、Uand U/Th、δU、V/(V+Ni) 、V/Cr、Ni/Co as index,It is further confirmed that the slope-continental slope facies of the Niutitang formation in the study area are all located below the oxidation interface,It belongs to the environment of anaerobic reduction,To the top of this group,there is a deep-water shelf facies deposition with low oxygen and weak oxidation,Seven REDOX stages were further divided,The sedimentary environmental conditions and evolution characteristics of Niutitang formation in the study area were refined.

引文

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