Effects of magmatic intrusion on mineralogy and geochemistry of coals from the Fengfeng-Handan coalfield, Hebei, China
Effects of magmatic intrusion on mineralogy and geochemistry of coals from the Fengfeng-Handan coalfield, Hebei, China
复制标题
岩浆侵入对河北峰峰-邯郸煤田煤炭矿物学和地球化学的影响
DOI：
10.1021/ef060618f
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发表时间：
2007-05-01
期刊：
影响因子：
5.3
通讯作者：
Ren, Deyi
中科院分区：
文献类型：
--
作者：
Dai, Shifeng;Ren, Deyi
本文讨论了岩浆侵入对河北丰丰—邯郸煤田晚古生代煤的岩石学、矿物学和地球化学的影响。煤田的高挥发性A煤（hvAb）、中挥发性A煤（mvb）、低挥发性A煤（lvb）、半无烟煤（sa）、无烟煤（an）、超无烟煤（ma）等不同等级的窄区煤，最适合用岩浆输入来解释。岩浆热蚀变产生的矿物主要为黄铁矿、方解石和铁白云石，主要以裂隙或囊泡充填形式赋存于热蚀变的高阶煤中。根据元素浓度随煤阶的变化（富集、贫化、无变化）和矿物学亲和力，将煤中的元素分为A-F 6类。A组元素（B、F、Cl、Br、Hg）、B组元素（As、Co、Cu、Ni、Pb）、C组元素（Sr、Mg、Ca、Mn、Zn）和D组元素(U)在蚀变煤中富集，表明岩浆输入是这些元素的来源。A族元素是挥发性元素，可能来自热液溶液，然后在岩浆热作用下沉积或从煤中的有机成分中分离出来，然后再沉积在煤中。B族元素主要分布在黄铁矿的裂隙或囊泡充填体中。C族元素的主要载体是热蚀方解石和铁白云石。D族的铀以有机键和硅酸盐结合形式存在。E族元素Sb、Sc、V在蚀变煤中有耗损趋势，F族剩余元素在未蚀变、微蚀变和蚀变煤中变化不明显。E族和F族中与煤阶无关的元素浓度可能表明这些元素是煤所固有的。
This paper describes the effects of magmatic intrusions on petrology, mineralogy, and geochemistry of the late Palaeozoic coals from the Fengfeng-Handan coalfield, Hebei, China. The narrowly zoned coals of variable ranks, from high-volatile A bituminous (hvAb), through medium-volatile bituminous (mvb), low-volatile bituminous (lvb), semianthracite (sa), and anthracite (an), to meta-anthracite (ma) in the coalfield, were found to be best explained by magmatic inputs. The minerals derived from magmatic thermal alteration consist of pyrite, calcite, and ankerite, which mainly occur as fracture or vesicle fillings in the thermally altered high-rank coals. The variation in element concentrations with coal ranks (enrichment, depletion, and no variation) and mineralogical affinity were used to classify elements in coals into six groups, groups A-F. Elements in group A (B, F, Cl, Br, and Hg), group B (As, Co, Cu, Ni, and Pb), group C (Sr, Mg, Ca, Mn, and Zn), and Group D (U) were enriched in the altered coals, indicating that the magmatic inputs are the source of these elements. Group A elements are volatile elements that probably came from the hydrothermal solutions, then deposited or were driven off from an organic component in coal by magmatic heat, and then redeposited in the coal. Group B elements mainly distribute in the fracture or vesicle fillings of pyrites. The dominant carriers of group C elements are thermally altered calcite and ankerite. Uranium in group D occurs in organic-bonded and silicate associations. Group E elements, including Sb, Sc, and V, have a depletion trend in the altered coals, and the remaining elements in group F do not clearly vary in the unaltered, slightly altered, or altered coals. The element concentrations independent of coal ranks in groups E and F may suggest that these elements are inherent to the coal.