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赞比亚东北部姆波洛科索盆地沉积地层特征 预览

Sedimentary Stratigraphic Characteristics of The Mporokoso Basin in The North-eastern Zambia
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摘要 赞比亚东北部姆波洛科索盆地古元古代姆波洛科索群是研究早前寒武纪河流相、浅海相沉积序列和基底组分的重要地层单元。本文通过对该地区岩石地层组成、沉积时代与沉积环境方面进行研究及系统总结,并结合对该地区姆巴拉组实测剖面及其碎屑岩岩石学和地球化学分析数据,获得以下认识:姆波洛科索群可能形成于1860 Ma之后,其上覆卡萨马群可能形成于1434 Ma之后;姆波洛科索盆地沉积环境主要包括:辫状河、冲积扇、湖泊以及浅海等;姆波洛科索群底部姆巴拉组碎屑岩以班委乌卢地块基底花岗岩为主要物源,形成于被动大陆边缘构造背景之下;姆波洛科索盆地可能属于被动大陆边缘型盆地;化探分析数据显示盆地东部与北部地区分别具有金、铀找矿潜力。 The Paleoproterozoic Mporokoso Group in the Mporokoso Basin of north-eastern Zambia is an important stratum for the study of fluvial to shallow-marine sedimentary succession and basal components of the early Precambrian. In this paper, based on the study and systematic summary of lithostratigraphic composition,sedimentary age and environment, combined with the measured section of Mbala Formation and its clastic petrological and geochemical analysis data in the region,the following knowledge is obtained: The Mporokoso Group is supposed to be formed later than 1860 Ma,and the overlying Kasama Group is supposed to be formed later than 1434 Ma;The sedimentary environment of the Mpolokoso Basin mainly includes: braided rivers,alluvial fans,lakes and shallow seas;The clastic rocks of Mbala Formation at the bottom of Mporokoso Group are mainly derived from basement granite of the Bangweulu Block and formed under the passive continental marginal tectonic setting;The Mporokoso Basin may belong to the passive continental marginal basin;Geochemical analysis data have shown potentials for gold and uranium prospecting in the eastern and northern parts of the basin,respectively.
作者 孙宏伟 王杰 任军平 左立波 古阿雷 SUN Hongwei;WANG Jie;REN Junping;ZUO Libo;GU Alei(Tianjin Center of China Geological Survey,Tinjin,300170)
出处 《地质论评》 CAS CSCD 北大核心 2019年第1期232-245,共14页 Geological Review
基金 商务部技术援外项目(编号:[2015]352) 中国地质调查局项目(编号:121201006000150014)的成果.
关键词 赞比亚 姆波洛科索盆地 沉积特征 地球化学 资源潜力 Zambia Mporokoso Basin Sedimentary characteristics Geochemistry Resource potential
作者简介 孙宏伟,男,1986年生,工程师,矿物学、岩石学、矿床学专业,Email:shwcub@163.com;通讯作者:王杰,男,1964年生,教授级高级工程师,主要从事地质矿产调查与研究,Email:wangjie513046@163.com。
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