The occurrence and origin of selenium minerals in Se-rich stone coals, spoils and their adjacent soils in Yutangba, China

The occurrence and origin of selenium minerals in Se-rich stone coals, spoils and their adjacent soils in Yutangba, China
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玉塘坝富硒石煤、弃土及其邻近土壤中硒矿物的赋存状态及成因

DOI:
10.1016/j.chemgeo.2012.08.023
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发表时间:
2012-11
期刊:
影响因子:
3.9
通讯作者:
Pesek J
Pesek J
中科院分区:
地球科学2区
文献类型:
--
作者:
Zhu JM;Johnson TM;Finkelman RB;Zheng BS;Sykorova I;Pesek J

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恩施州渔塘坝地区曾发生过人类硒中毒事件,在该地区的富硒石煤、弃土及其附近的有机质富集土壤中发现了多种含硒矿物。这些矿物主要包括自然硒(Se 0)、硫硒铜矿(CuSe 2)、硫硒铜矿(CuSe)、硫硒铜矿(Fe 2(SeO 3)3·6 H2O)、含硒黄铜矿(CuFe(Se,S)2)和黄铁矿(Fe(Se,S)2)。自然硒、克鲁泰矿、克洛克曼矿、含硒黄铁矿和黄铜矿的组合主要存在于断层面附近的石煤中,而自然硒和克鲁泰矿的组合则存在于距石煤出露60 m处的富硒碳质泥岩和富有机质土壤中。在自然燃烧的废弃石煤矸石中,存在着硒和自然硒的组合。自然硒在石煤矸石及其周围土壤中分布广泛。Cu-Se矿物与自然Se的共生表明,这些矿物可能是在低于220°C的相对酸性和还原性环境下形成的,并表明在酸性、富含有机物的表面环境中,Cu可能在固定还原态Se离子方面发挥重要作用。此外,硫砷铜矿的出现表明,在氧化环境中,铁氧化物对硒的地球化学行为具有制约作用。我们的观察提供了新的见解硒的固定和积累的机制,在风化过程中的富硒岩石。
Several Se-bearing minerals have been identified in Se-rich stone coal, spoils, and their adjacent organic-rich soils in Yutangba of Enshi, China, where human Se toxicity occurred in the 1960s. These minerals mainly include native Se (Se0), krutaite (CuSe2), klockmannite (CuSe), mandarinoite (Fe2(SeO3)3·6H2O), Se-bearing chalcopyrite (CuFe(Se, S)2), and pyrite (Fe(Se,S)2). The assemblage of native Se, krutaite, klockmannite, and Se-bearing pyrite and chalcopyrite is primarily present in the stone coal near a fault plane, while the assemblage of native Se and krutaite is found in the Se-rich carbonaceous mudstone and organic-rich soils which are 60m away from the stone coal exposure. The assemblage of mandarinoite and native Se is present in abandoned stone coal spoils, where natural combustion occurred. Native Se is quite extensive in the stone coal spoils and nearby soils derived from them. The co-occurrence of Cu–Se minerals and native Se indicates that these minerals could have formed under a relatively acidic and reducing environment below 220°C, and suggests that Cu could play a significant role in fixing reduced Se ions in the acidic, organic-rich surface environment. Furthermore, the occurrence of mandarinoite suggests that iron-oxides constrain the geochemical behavior of Se in oxidizing environments. Our observations provide new insights into the mechanisms of Se fixation and accumulation during weathering of Se-rich rocks.
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