| 黔东松桃地区南华系大塘坡组锰矿中黄铁矿硫同位素特征及其地质意义 |
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| 引用本文： | 王萍,周琦,杜远生,余文超,徐源,齐靓,袁良军.黔东松桃地区南华系大塘坡组锰矿中黄铁矿硫同位素特征及其地质意义[J].地球科学,2016,41(12):2031-2040. |
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| 作者姓名： | 王萍 周琦 杜远生 余文超 徐源 齐靓 袁良军 |
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| 作者单位： | 1.中国地质大学生物地质与环境地质国家重点实验室，湖北武汉 430074 |
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| 基金项目： | 中国地质调查局项目12120114016701国土资源部公益性行业科研专项201411051 |
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| 摘 要： | 黔东松桃地区是我国重要的锰矿富集区，其中大塘坡组中黄铁矿δ34S存在比较大的差异.通过CF-IRSM法对松桃李家湾、道坨、西溪堡矿区菱锰矿样品中黄铁矿硫同位素组成开展研究，结果显示出两个明显的特征:(1) 样品中黄铁矿普遍具有极高的δ34S值，为47.69‰~66.76‰；(2) 在同一成锰盆地中，水深相对较浅的李家湾矿区黄铁矿δ34S值(47.69‰~59.15‰)明显低于水深相对较深的道坨矿区的δ34S值(53.85‰~62.86‰)，且中心相δ34S的值(53.85‰~66.76‰)明显高于过渡相δ34S的值(47.69‰~59.15‰)，黄铁矿硫同位素组成表现出明显的深度梯度效应.大塘坡组含锰层位黄铁矿异常高的δ34S值及其明显的深度梯度特征表明，在新元古代Sturtian冰期刚刚结束的间冰期初期，海水硫酸盐浓度极低，海洋呈现显著的分层现象，这一时期深部海洋可能并没有完全氧化.
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| 关 键 词： | 锰矿 硫同位素 大塘坡组 松桃 地层学 |
| 收稿时间： | 2016-03-09 |
Characteristics of Pyrite Sulfur Isotope of Mn Deposit from Datangpo Formation in Songtao Area,East Guizhou Province and Its Geological Significance |
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| Abstract: | Songtao area, East Guizhou Province, is an important area rich in manganese ore deposit, of which there are relatively big differences between pyrite δ34S values. This paper focuses on the sulfur isotope composition of pyrite from dialogite samples in Lijiawan, Daotuo and Xixibao areas in Songtao. CF-IRSM results indicate two obvious characteristics: (1) the pyrites mostly have extremely high δ34S values, which vary between 47.69‰-66.76‰; (2) the δ34S values of pyrites in shallow water Lijiawan area (47.69‰-59.15‰) are obviously lower than those in deep water Daotuo area (53.85‰-62.86‰) in the same basin, and the δ34S values of pyrites in central facies (53.85‰-66.76‰) are obviously higher than those in transition facies (47.69‰-59.15‰), the sulfur isotope compositions of pyrites have distinctive depth gradient effect. The extremely high δ34S values and distinctive depth gradient features of pyrites in Mn deposit in Datangpo Formation indicate that the ocean has extremely low sulfate concentration and obvious stratified phenomenon. The deep ocean has not been completely oxidized at the beginning of interglacial period after Neoproterozoic sturtian glaciation. |
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