Concentration and distribution of elements in Late Permian coals from western Guizhou Province, China
Concentration and distribution of elements in Late Permian coals from western Guizhou Province, China
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DOI：
10.1016/j.coal.2004.07.003
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发表时间：
2005-01-18
影响因子：
5.6
通讯作者：
Hao, LM
中科院分区：
文献类型：
--
作者：
Dai, SF;Ren, D;Hao, LM
为了更好地了解煤的地球化学特征，对黔西晚二叠世71个全煤层煤通道样品进行了研究，测定了其中57种元素。黔西晚二叠世煤中的At、Ca、Co、Cr、Cu、Fe、Ga、Hf、K、Li、Mn、Me、Nb、Ni、Sr、Ta、Ti、Th、U、V、Zr和稀土元素含量高于美国煤中相应元素的算术平均值，而As、Ba、Br、F、Hg、P、Se和Tl则较低。与中国普通煤相比，黔西煤中Co、Cr、Cu、Ga、Hf、Li、Mn、Mo、Ni、Sc、Sr、Ti、U、V、Zn、Zr的含量较高，As、F、Hg、Rb、Sb、Tl、W的含量较低。按其在煤中的赋存状态可分为五组元素：A组为Tm-Yb-Lu-Y Er Ho-Dy-Tb-Ce-La-Nd-Pr-Gd-Sm，B组为As-Sr-K-Rb-Ba-F-Ash-Si-Sn-Ga-Hf-Al-Ta-Zr-Be-Th-Na，它们与灰分呈高度正相关，主要表现为无机亲合力。来自B族的一些元素，例如Ba、Be、Ga、Hf和Th，也以显著的铝硅酸盐亲合力为特征。此外，砷还表现出高的硫化物亲和性（r（S-Fe）> 0.5）。除Bi、Cs、Nb、Mn、Se和Ti外，与灰分产率呈负相关或较低正相关的元素可归为其它4个组合：C组，Cr-V-Mo-U-Cd-Tl; D组，Hg-Li-Sc-Ti-Eu-Nb-Cs-W; E组，Bi-Sb; F组，Co-Ni-Cu-Pb-Zn-Mg-Se-Ca-Mn-S-Fe。Co、Cr、Cu、Fe、Hg、Li、Mo、Ni、P、S、Sc、U、V、Zn等元素与灰分产率的相关系数均低于统计显著值。只有Cr和Cu与灰分产率呈负相关（分别为-0.07和-0.01），显示中间（有机和无机）亲和力。锰和铁具有碳酸盐亲和力的特征，这可能是由于某些煤中含有高含量的表生脉铁白云石。磷与其他元素的相关系数都很低，不包括在这六种组合中。黔西煤中元素富集的可能成因类型有5种：烃源岩、火山灰、低温热液、地下水和岩浆热液输入。(C)2004 Elsevier B. V.保留所有权利。
With the aim of better understanding geochemistry of coal, 71 Late Permian whole-seam coal channel samples from western Guizhou Province, Southwest China were studied and 57 elements in them were determined. The contents of At, Ca, Co, Cr, Cu, Fe, Ga, Hf, K, Li, Mn, Me, Nb, Ni, Sri, Ta, Ti, Th, U, V, Zr, and REEs in the Late Permian coals from western Guizhou Province are higher than the arithmetic means for the corresponding elements in the US coals, whereas As, Ba, Br, F, Hg, P, Se, and Tl are tower. Compared to common Chinese coals, the contents of Co, Cr, Cu, Ga, Hf, Li, Mn, Mo, Ni, Sc, Sri, Ti, U, V, Zn, and Zr in western Guizhou coals are higher, and As, F, Hg, Rb, Sb, Tl, and W are lower. Five groups of elements may be classified according to their mode of occurrence in coal: The first two, Group A, Tm-Yb-Lu-Y Er Ho-Dy-Tb-Ce-La-Nd-Pr-Gd-Sm, and Group B, As-Sr-K-Rb-Ba-F-Ash-Si-Sn-Ga-Hf-Al-Ta-Zr-Be-Th-Na, have high positive correlation coefficients with ash yield and they show mainly inorganic affinity. Some elements from Group B, such as Ba, Be, Ga, Hf, and Th, are also characterized by significant aluminosilicate affinity. In addition, arsenic also exhibits high sulfide affinity (r(S-Fe)> 0.5). The elements, which have negative or lower positive correlation coefficients with ash yield (with exceptions of Bi, Cs, Nb, Mn, Se, and Ti), are grouped in other four associations: Group C, Cr-V-Mo-U-Cd-Tl; Group D, Hg-Li-Sc-Ti-Eu Nb-Cs-W; Group E, Bi-Sb; and Group F, Co Ni-Cu-Pb-Zn-Mg-Se-Ca-Mn-S-Fe. The correlation coefficients of some elements, including Co, Cr, Cu, Fe, Hg, Li, Mo, Ni, P, S, Sc, U, V, and Zn, with ash yield are below the statistically significant value. Only Cr and Cu are negatively correlated to ash yield (-0.07 and -0.01, respectively), showing intermediate (organic and inorganic) affinity. Manganese and Fe are characterized by carbonate affinity probably due to high content of epigenetic veined ankerite in some coals. Phosphorus has low correlation coefficients with any other elements and is not included in these six associations. There are five possible genetic types of enrichment of elements in coal from western Guizhou Province: source rock, volcanic ash, low-temperature hydrothermal fluid, groundwater, and magmatic hydrothermal inputs. (C) 2004 Elsevier B.V. All rights reserved.