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Shifeng Dai Xiaoqiang Hou Deyi Ren Yuegang Tang 《International Journal of Coal Geology》2003,55(2-4):139-150
The chemical composition of pyrite in coal can be used to investigate its geological and mineralogical origin. In this paper, high-resolution time-of-flight secondary ion mass spectrometry (TOF-SIMS) was used to study the chemical composition of various pyrite forms in the No. 9 coal seam (St,d=3.46%) from the Wuda Coalfield, Inner Mongolia, northern China. These include bacteriogenic, framboidal, massive, cell-filling, fracture-filling, and nodular pyrites. In addition to Fe+ (54Fe+, 56Fe+, 57Fe+), other fragment ions were detected in bacteriogenic pyrites, such as 27Al+, Si+ (28Si+, 29Si+, 30Si+), 40Ca+, Cu+ (63Cu+, 65Cu+), Zn+ (64Zn+, 66Zn+, 67Zn+, 68Zn+), Ni+ (58Ni+, 60Ni+, 62Ni+), and C3H7+. TOF-SIMS images show bacteriogenic pyrites are relatively rich in Cu, Zn, and Ni, suggesting that bacteria probably play an important role in the enrichment of Cu, Zn, and Ni during their formation. Intense positive secondary ion fragments from framboidal aggregates, such as 27Al+, 28Si+, 29Si+, AlO+, CH2+, C3H3+, C3H5+, and C4H7+, indicate that formation of the framboidal aggregates may have occurred together with clay mineral and organic matter, which probably serve as the binding substance. The intense ions of 28Si+ and 27Al+ from massive pyrites also suggest that their pores incorporated clay minerals during crystallization. Together with the lowest 28Si+/23Na+ value, the intense organic positive secondary ion peaks from cell-filling pyrites, such as C3H3+, C3H5+, C3H7+, and C4H7+, indicate that pyrite formation may have accompanied dissolution or disintegration of the cell. The intense P+ peak was observed only in the fracture-filling pyrite and the highest 28Si+/23Na+ value of fracture-filling pyrite reflects its epigenetic origin. Together with XRD and REEs data, the stronger 40Ca+ in nodular pyrite than other pyrite forms shows seawater influence during its formation. 相似文献
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煤中黄铁矿的成因研究 总被引:14,自引:0,他引:14
本文在系统地研究四川晚二叠世高硫煤中黄铁矿矿物学的基础上,运用微区电子探针、中子活化、X光电子能谱和硫同位素等多 种方法综合地研究煤中黄铁矿的结构、成分、价态及同位素等成因标型特征,对黄铁矿标型特征进行了成因探讨,有效地判别了成岩期形成的I型脉状黄铁矿及后生热液Ⅱ型脉状黄铁矿。同时提出直接沉淀系列(自形晶→集合→聚晶)和复杂成因(微粒、莓粒→圆球→结核→团块)等两大类成因演化模式。它不仅对不同类型 相似文献
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采自我国不同聚煤区的不同时代的89件煤样品,用中子活化分析法(INAA)分别测定了29种微量元素。据统计分析结果表明:(1)绝大多数微量元素的平均值高于世界的平均值,含量范围也较美国宽。我国各聚煤区不同时代间相比较,煤中大多数元素的平均含量和富集因数,从华南二叠纪至华北石炭—二叠纪到全国中-新生代逐渐降低。(2)中-新生代的煤中,元素间的相关性较好,华南二叠纪次之,而华北石炭—二叠纪的煤最差。(3)REE分布模式类型以中-新生代的煤最复杂;而华北石炭—二叠纪的煤较简单。 相似文献
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以内蒙古乌达矿区为例,通过对高硫煤9煤层中黄铁矿和有机硫同位素的测定(有机硫同位素δ^34S=-12.3‰-5.8‰,黄铁矿硫同位素δ^34S=-18.7‰-1.1‰),结合煤岩学特征的综合分析以及黄铁矿化菌落和蓝藻胶壳的发现,提出了庙充煤中硫的党政军化模式,认为高硫煤中主要来源的硫的同位素由于硫酸盐的异化细菌还原作用导致大规模分馏,使之趋于负值,在高硫煤形成过程中,黄铁矿和有机硫表现出形成初期Fe^2 和有机质对硫离子的争夺性、形成过程中在剖面上的层次性、阶段性和时间上的相向性,层次性和阶段性表现为沼泽体系对SO4^2-和H2S的开放程度及黄铁矿的形成对^32SO4^2-的过滤性,相向性表现为泥炭聚积初期和晚期,Fe^2 和SO4^2-对高硫煤形成做出了贡献,具有剖面上的对称特点。 相似文献
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用边界元法研究川西地区的形变场与应变场 总被引:1,自引:1,他引:0
将巴颜喀拉地块和四川地块作为研究对象,用块体边界上的GPS位移作为输入数据,应用边界元法计算得到块体边界上的应力,再用求解出的边界应力计算块体内部的位移与应变.结果发现巴颜喀拉块体南北向为张应变作用;块体西侧张应变量较大,向东逐渐减小,到龙门山东侧应变几乎减弱为零.南北向张应变向东的迅速减弱,使得龙门山断层产生闭锁,闭锁使龙门山断裂聚集起巨大的应变能,应变能的大量积累可能是导致汶川地震发生的根本原因. 相似文献
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四川晚二叠世煤中硫与成煤环境的关系 总被引:2,自引:0,他引:2
本文从沉积学、成煤环境、地球化学等方面研究了煤中硫的分布规律,并详细阐明了煤中硫与成煤环境的关系。研究表明:煤中硫的赋存状况,不仅受成煤环境的影响,而且受其顶板沉积环境的影响。成煤环境奠定了煤中硫的分布基础,而顶板环境则是促使煤富硫、高硫的重要因素。微咸水浑水潮坪的顶板沉积环境,导致了下伏煤高黄铁矿硫,而咸水的清水潮坪顶板环境则导致下伏煤高有机硫。 相似文献
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Shifeng Dai Deyi Ren Yuegang Tang Longyi Shao Shengsheng Li 《International Journal of Coal Geology》2002,51(4):254
This paper describes coal petrographic characteristics, sulfur abundance, distribution and isotopic signature in coals in the Wuda coalfield, Inner Mongolia, northern China. Petrographic studies suggest that depositional environment influences petrographic composition. The No. 9 and No. 10 coal seams, which are thought to have formed on a tidal delta plain, have high collodetrinite contents (up to 66.1%) indicating enhanced gelification and bacteria activity during coal accumulation, and also have the highest sulfur content (3.46% and 3.42%). Both organic and pyritic sulfur isotope values (−12.3‰ to 5.8‰ and −18.7‰ to 1.1‰, respectively) are variable and generally tend to be more negative in high-sulfur coals than those in low-sulfur coals in the Wuda coalfield. The negative sulfur isotope values indicate that a large portion of sulfur in the high-sulfur coals has a bacterial origin. Sulfur isotopic compositions and variations within the section were used to propose a model to explain the origin of sulfur in these coals. The presence of pyritized rod-like bacteria, cyanophyte's gelatinous sheaths and degraded algae organic matter suggests that bacteria, and perhaps algae, may play an important role in the formation of these high-sulfur coals. 相似文献
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从临安昌化镇和大峡谷镇采集了一百多个昌化鸡血石样品,分别对其作了岩石薄片鉴定、红外分析、X射线衍射分析,归纳总结了常见鸡血石种类的成分和岩性:冻地主要成分为地开石/高岭石,岩性为粘土质岩石;软地主要成分为强粘土化火山碎屑或粘土,岩性多为强粘土化凝灰岩-粘土质岩石;软刚地主要成分为蚀变火山碎屑/明矾石,岩性多为明矾石岩或中等粘土化/明矾石化凝灰岩;硬刚地主要成分为石英,岩性为弱明矾石化/弱粘土化凝灰岩;硬地主要成分为石英,岩性为弱-强硅化凝灰岩。 相似文献