摘要
作为一种沉积型矿床,锰矿的形成受沉积相的控制。重庆秀山南华系大塘坡组下部炭质页岩中赋存菱锰矿矿床,为研究沉积相对菱锰矿矿床的控矿作用提供了新的材料。详细的宏观露头和岩心观察及镜下显微特征的分析表现,研究区内大塘坡组主要形成于裂谷盆地环境,裂谷盆地又分次级地堑盆地区、次级地垒区。在地堑盆地区识别出盆地中心、盆地边缘、斜坡3种沉积亚相。通过对剖面或钻孔沉积相、含矿性统计表明,菱锰矿主要赋存在盆地中心亚相,其次为盆地边缘亚相。菱锰矿的形成与盆地相的缺氧-贫氧条件密切相关,这种氧化-还原状态的波动为菱锰矿的沉积和成矿提供了有利的地球化学环境。
As sedimentary deposits, the formation of rhodochrosite deposits has been suggested to be controlled by sedimentary facies. Occurrence of manganese ore in the carbonaceous shale at the lower part of Datangpo Formation, Xiushan, Chongqing, provides a new case for the studying the ore controlling effect of the sedimentary manganese. Based on detailed outcrop investigation, core description and observation under the microscope, the Datangpo Formation in the study area mainly developed in rift basin, can be divided into sub-graben basin and sub-horst. The sub-graben basin could be subdivided into three subfacies, including the basin center, basin edge and slope. Manganese ore is mainly hosted in the basin center subfa cies, followed by the basin edge subfacies. Manganese ore is mainly formed in anoxia-suboxia basinal environment, where fluctuations in redox conditions provide a favorable geochemical environment.
出处
《地质科技情报》
CAS
CSCD
北大核心
2016年第6期150-156,共7页
Geological Science and Technology Information
基金
国土资源部公益性科研专项(201411051)
中国地质调查局地质调查项目(12120114016201
12120113050300)
关键词
锰矿
南华纪
大塘坡组
秀山
manganese ore
Nanhua Period
Datangpo Formation
Xiushan
