摘要
穆呼锰矿是玛尔坎苏锰矿带东部重要的典型锰矿床,锰矿体主要产于一套碎屑岩碳酸盐岩之中。含锰岩系顶部产出的类化石主要为似纺锤[虫筳]Quasifusulina属,其中包括最揉似纺锤[虫筳]Quasifusulina tennissima(Schellwien)、大豆形似纺锤[虫筳]Quasifusulina phaselus(Lee)和拟紧卷似纺锤[虫筳]Quasifusulina paracompacta(Chang)3个种和2个未定种,指示含锰岩系为晚石炭世地层。锰矿体顶底板围岩δ^(13) C_(PDB)值为-2.06‰~3.99‰,δ^(18) O_(PDB)值为-13.35‰~-7.49‰,^(87)Sr/^(86)Sr值为0.70770~0.70797。菱锰矿δ^(13) C_(PDB)值为-16.60‰~-1.95‰,δ^(18) O_(PDB)值为-11.51‰~-4.48‰,^(87)Sr/^(86)Sr值为0.70764~0.70790。综合分析,认为穆呼锰矿含锰岩系为温暖、盐度正常、水动力相对较强的浅海陆棚沉积;水体清澈,但相对于碳酸盐岩台地沉积水体要浑浊。碳酸盐岩和锰矿层在沉积过程中受到了陆表水的影响,菱锰矿的形成与有机质还原作用有关。
Muhu Manganese Deposit is an important typical manganese deposit in the eastern part of the Malkansu Manganese Belt.Manganese ore bodies are mainly hosted in a set of clastic-carbonate rocks.Fossils from the top of manganese-bearing rock series are mainly Quasifusulina,include Quasifusulina tennissima(Schellwien),Quasifusulina phaselus(Lee),Quasifusulina paracompacta(Chang),and two unidentified species,indicating that the geological age of the manganese-bearing strata should be the Late Carboniferous.Theδ^(13) C_(PDB) values of surrounding rock range from-2.06‰to 3.99‰;δ^(18) O_(PDB) values range from-13.35‰to-7.49‰;and ^(87)Sr/^(86)Sr values range from 0.70770 to 0.70797.In contrast,theδ^(13) C_(PDB) values of rhodochrosite range from-16.60‰to-1.95‰;δ^(18) O_(PDB) values range from-11.51‰to-4.48‰;and ^(87)Sr/^(86)Sr values range from 0.70764 to 0.70790.Comprehensive analysis reveals that the Mn-bearing rock series in Muhuhu Manganese Deposit developed in a shallow shelf with warm,normal salinity,and relatively strong hydrodynamic force.The water column is clear,but comparatively turbid compared to carbonate platform sedimentary environment.The deposition of carbonate rocks and manganese deposits was affected by surface water,and the formation of rhodochrosite is associated with the reduction of organic matter.
作者
陈登辉
隋清霖
郭周平
赵晓健
滕家欣
高永宝
CHEN Denghui;SUI Qinglin;GUO Zhouping;ZHAO Xiaojian;TEN Jiaxin;GAO Yongbao(Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits,MNR,Xi'an 710054,Shaanxi,China;Research Center for Orogenic Geology,China Geological Survey,Xi'an 710054,Shaanxi,China;Xi'an Center of Geological Survey,China Geological Survey,Xi'an 710054,Shaanxi,China;School of Resource&Environment and Safety Engineering,University of South China,Hengyang 421001,Hunan,China)
出处
《西北地质》
CAS
CSCD
北大核心
2022年第2期1-13,共13页
Northwestern Geology
基金
第二次青藏高原综合科学考察研究“西昆仑-祁漫塔格地区锰铁铅锌铜等大宗金属矿产科考”(2021QZKK0303)
国家自然科学基金“西昆仑塔什库尔干地区赞坎铁矿床流体包裹体研究及对膏盐层参与铁矿成矿的启示”(41503046)
陕西省自然科学基金“西昆仑奥尔托喀讷什锰矿优质富锰矿成因”“西昆仑奥尔托卡纳什锰矿上石炭统含锰碳酸盐岩沉积环境研究”(2019JQ-935、2017JM4024)
中国地质调查局“西昆仑大红柳滩-甜水海地区大型矿产资源基地综合调查”(DD20190143)。
关键词
上石炭统
碎屑岩碳酸盐岩
沉积环境
[虫筳]类
碳、氧、锶同位素
穆呼锰矿
西昆仑
Late Carboniferous
terrigenous clastics-carbonate
sedimentary environment
fusulinids
C
O
Sr isotopes
Muhu manganese deposit
West Kunlun
