Trace element affinities in two high-Ge coals from China
Trace element affinities in two high-Ge coals from China
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中国两种高Ge煤中的微量元素亲和力
DOI：
10.1016/j.fuel.2010.08.011
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发表时间：
2011
期刊：
影响因子：
7.4
通讯作者：
Querol, Xavier
中科院分区：
文献类型：
--
作者：
Li, Jing;Zhuang, Xinguo;Querol, Xavier
云南临沧、内蒙古乌兰图嘎等地赋存着高锗含量的煤。这些煤还含有高浓度的其他一些元素。为了确定两种煤中富集元素的赋存方式，用重液体从两个代表性样品中获得了<1.43至>2.8g/cm3的6个密度分数。这些高锗煤具有许多奇特的地球化学模式。因此，对这些密度分数的化学分析结果表明，这两种煤（非常遥远且地质时代不同）都高度富集（与世界上通常的煤浓度范围相比）Ge、As、Sb、W、Be和Tl。这可能是由于中国这些地区影响地壳的热液流体的地球化学特征相似。乌兰图加煤（早白垩世亚烟煤）也富集Ca、Mg、Na，临沧煤（新近系亚烟煤）富集K、Rb、Nb、Mo、Sn、Cs、u等元素，Ge、W、B、Nb、Sb等元素在两种煤中均以有机亲和为主。此外，临沧地区的Be、U、Mo（以及部分Mn、Zn）和乌兰图嘎地区的Na、Mg也具有主要的有机亲和力。两种煤均含有硫化物-砷化物矿物组合（Fe、S、As、Sn和Pb，临沧煤中还含有Tl、Ta和Cs）。两种煤中Al、P、Li、Sc、Ti、V、Cr、Zr的赋存和临沧地区Ba的赋存与硅铝酸盐和少量重矿物的矿物组合有关。临沧地区P、Na、Li、Sc、Ti、Ga、Rb、Zr、Cr、Ba、Th和LREE （La、Ce、Pr、Nd、Gd）与磷酸盐和少量重矿物的矿物组合有关。后两种矿物组合源于碎屑矿物的赋存。最后，两种煤样还具有硫酸盐矿物组合（Ca和Sr），这可能是煤层成岩氧化和蚀变的结果。煤中Ge的富集发生在有机质仍处于反应圈闭状态时，但多项特征表明富集是成岩作用的。
The Lincang (Yunnan Province, Southwest China) and Wulantuga (Inner Mongolia, Northeast China) coal deposits are known because of the high-Ge content. These coals have also a high concentration of a number of other elements. To determine the mode of occurrence of the enriched elements in both coals, six density fractions from<1.43 to>2.8g/cm3were obtained from two representative samples using heavy-liquids. A number of peculiar geochemical patterns characterize these high-Ge coals. Thus, the results of the chemical analysis of these density fractions showed that both coals (very distant and of a different geological age) are highly enriched (compared with the usual worldwide coal concentration ranges) in Ge, As, Sb, W, Be, and Tl. This may be due to similar geochemistry of hydrothermal fluids influencing the Earth Crust in these regions of China. Moreover, Wulantuga coal (Early Cretaceous subbituminous coal) is also enriched in Ca, Mg, and Na, and Lincang coal (Neogene subbituminous coal) in K, Rb, Nb, Mo, Sn, Cs, and U. A group of elements consisting of Ge, W, B, Nb, and Sb mostly occur with an organic affinity in both coals. Additionally, Be, U, and Mo (and partially Mn and Zn) in Lincang, and Na and Mg in Wulantuga occur also with a major organic affinity. Both coals have sulfide–arsenide mineral assemblages (Fe, S, As, Sn, and Pb, and in addition to Tl, Ta, and Cs in the Lincang coal). The occurrence of Al, P, Li, Sc, Ti, V, Cr, and Zr in both coals, and Ba in Lincang, are associated with the mineral assemblage of silico-aluminates and minor heavy minerals. Furthermore, P, Na, Li, Sc, Ti, Ga, Rb, Zr, Cr, Ba, Th, and LREE (La, Ce, Pr, Nd, and Gd) in Lincang are associated with mineral assemblages of phosphates and minor heavy minerals. The two later mineral assemblages are derived from the occurrence of detrital minerals. Finally, the two coal samples have also the sulfate mineral assemblage (Ca and Sr) that probably occur as a consequence of a diagenetic oxidation and alteration of the coal seams. The enrichment of Ge in coal occurred when the organic matter was still reactive to trap Ge, but several features indicate that the enrichment was diagenetic.
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DOI：
10.1016/c2013-0-00949-8
发表时间：
1990-07
期刊：
The Astrophysical Journal Supplement Series
影响因子：
--
作者：
D. J. Swaine
通讯作者：
D. J. Swaine
DOI：
10.5860/choice.28-3100
发表时间：
1983
期刊：
--
影响因子：
--
作者：
V. Valković
通讯作者：
V. Valković
DOI：
--
发表时间：
1999
期刊：
--
影响因子：
--
作者：
Qi Huawen
通讯作者：
Qi Huawen
DOI：
10.1007/bf02875634
发表时间：
1998-12
期刊：
Science in China Series D: Earth Sciences
影响因子：
--
作者：
Hanping Zhuang;Jialan Lu;Jia-mo Fu;Jinzhong Liu;Chi-gang Ren;Degang Zou
通讯作者：
Hanping Zhuang;Jialan Lu;Jia-mo Fu;Jinzhong Liu;Chi-gang Ren;Degang Zou
DOI：
--
发表时间：
2002
期刊：
Coal Geology & Exploration
影响因子：
--
作者：
Qi Hua
通讯作者：
Qi Hua