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广西东平锰矿赋矿地层归属及其时代探讨

HUANG Xiang-lin,LU Gang, GAO Yang,LING Shao-nian,WU Li-he,ZHOU Juan-juan,ZHONG Feng-yun

Journal of Stratigraphy（2017）

Cited 4|Views12
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Abstract
广西东平锰矿是一个大型红土型锰矿床,分为原生锰矿含矿层和次生锰矿含矿层.由于历史原因,绝大部分学者将原生锰矿含矿层的地层归属浅水台地相的北泗组.区调中,根据矿区实测剖面的岩石组合、沉积相特征及古生物特征与标准剖面的对比,将赋矿地层归属于石炮组,并新建东平层,代表含锰地层.在赋矿地层下部的泥岩层中采获Claraia sp.等早三叠世双壳类及菊石化石,LA-ICP-MS法测得赋矿地层顶部火山碎屑岩中锆石U-Pb年龄为251.5±2.5 Ma,在火山碎屑岩层之上采获中三叠世双壳类和菊石,确定锰矿赋矿地层的时代为早三叠世中晚期.
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Key words
Beisi Formation,Dongping Manganese Ore,Guangxi,Triassic,LA-ICP-MS,ore-bearing strata,stratigraphy,Shipao Formation
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