Mineralogy and geochemistry of a superhigh-organic-sulfur coal, Yanshan Coalfield, Yunnan, China: Evidence for a volcanic ash component and influence by submarine exhalation
Mineralogy and geochemistry of a superhigh-organic-sulfur coal, Yanshan Coalfield, Yunnan, China: Evidence for a volcanic ash component and influence by submarine exhalation
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中国云南燕山煤田超高有机硫煤的矿物学和地球化学：火山灰成分和海底呼气影响的证据
DOI：
10.1016/j.chemgeo.2008.06.030
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发表时间：
2008-09-30
期刊：
影响因子：
3.9
通讯作者：
Zhu, Xingwei
中科院分区：
文献类型：
--
作者：
Dai, Shifeng;Ren, Deyi;Zhu, Xingwei
采用光学显微镜、低温灰化加x射线衍射分析、扫描电镜配能色散x射线能谱仪、序贯化学萃取法和电感耦合等离子体质谱法对云南燕山煤田晚二叠世超高有机硫（SHOS）煤进行了矿物学和地球化学研究。燕山煤田M9煤为SHOS煤，总硫含量为10.12% ~ 11.30%，有机硫含量为8.77% ~ 10.30%。煤中的矿物主要为高温石英、硅辉石、钠长石、白云母、伊利石、黄铁矿，并有少量高岭石、斜长石、角长石、金红石、钾辉石等。与世界普通煤（烟煤和无烟煤）和中国煤相比，M9煤显著富集B （268 μ g/g）、F （841 μ g/g）、V （567 μ g/g）、Cr （329 μ g/g）、Ni （73.9 μ g/g）。Mo （204 μ g/g）和U （153 μ g/g）。硒元素含量为25.2 μ g/g。Zr （262 μ g/g）、Nb （20.1 μ g/g）、Cd （2.07 μ g/g）、TI （2.03 μ g/g）也富集于煤中。M9煤中高温石英、白晶石、白云母和伊利石的赋存表明煤中存在火山灰成分，这些火山灰来源于泥炭堆积过程中落入沼泽的酸性火山灰。煤中钠长石、钠长石的赋存和F、S、V、Cr、Ni、Mo、U等元素的富集是受海底呼出物随海水侵入缺氧泥炭沼泽的影响。稀土元素、Nb、Y、Zr、TiO2等亲石元素丰度表明煤中的硅酸盐矿物来源于盆地南部的越南北部高地。(C) 2008 Elsevier B.V.版权所有
The mineralogy and geochemistry of a superhigh-organic-sulfur (SHOS) coal of Late Permian age from the Yanshan Coalfield, Yunnan Province, southwestern China, have been studied using optical microscope, low-temperature ashing plus X-ray diffraction analysis, scanning electron microscope equipped with energy-dispersive X-ray spectrometer, a sequential chemical extraction procedure, and inductively coupled plasma mass spectrometry. The M9 Coal from the Yanshan Coalfield is a SHOS coal that has a total sulfur content of 10.12%-11.30% and an organic sulfur content of 8.77%-10.30%. The minerals in the coal consist mainly of high-temperature quartz, sanidine, albite, muscovite, illite, pyrite, and trace amounts of kaolinite, plagioclase, akermanite, rutile, and dawsonite. As compared with ordinary worldwide (bituminous coals and anthracite) and Chinese coals, the M9 Coal is remarkably enriched in B (268 mu g/g), F (841 mu g/g), V (567 mu g/g), Cr (329 mu g/g), Ni (73.9 mu g/g). Mo (204 mu g/g), and U (153 mu g/g). In addition, elements including Se (25.2 mu g/g). Zr (262 mu g/g), Nb (20.1 mu g/g), Cd (2.07 mu g/g), and TI (2.03 mu g/g) are also enriched in the coal. Occurrence of high-temperature quartz, sanidine, muscovite, and illite in the M9 Coal is evidence that there is a volcanic ash component in the coal that was derived from acid volcanic ashes fallen into the swamp during peat accumulation. Occurrence of albite and dawsonite in the coal and strong enrichment of some elements, including F, S, V, Cr, Ni, Mo and U, are attributed to the influence by submarine exhalation which invaded along with seawater into the anoxic peat swamp. Abundances of lithophile elements, including rare earth elements, Nb, Y, Zr, and TiO2, indicate that the silicate minerals in the coal were derived from the northern Vietnam Upland to the south of the basin. (C) 2008 Elsevier B.V. All rights reserved.