Source and Enrichment of Toxic Elements in Coal Seams around Mafic Intrusions: Constraints from Pyrites in the Yuandian Coal Mine in Anhui, Eastern China
Source and Enrichment of Toxic Elements in Coal Seams around Mafic Intrusions: Constraints from Pyrites in the Yuandian Coal Mine in Anhui, Eastern China
复制标题
镁铁质侵入体周围煤层有毒元素来源及富集：安徽元店煤矿黄铁矿的制约
DOI：
10.3390/min8040164
复制
发表时间：
2018-04-01
期刊：
影响因子：
2.5
通讯作者：
Lai, Chunkit
中科院分区：
文献类型：
--
作者：
An, Yanfei;Liu, Lingling;Lai, Chunkit
黄铁矿是一种在煤矿开采中可能造成潜在环境问题的矿物，通常存在于侵入体周围的煤层中。本文采用扫描电子显微镜、拉曼光谱和LA-ICPMS对安徽淮北煤田袁店煤矿黄铁矿进行了研究。黄铁矿的形态和地球化学特征表明：(1)原煤中存在四个黄铁矿世代(原煤中的框状沉积黄铁矿(PyⅠ)、侵入辉绿岩中的粗粒岩浆黄铁矿(PyⅡ)、侵入接触光环中的细粒变质黄铁矿(PyⅢ)和焦岩中的球状/脉状热液黄铁矿(Py IV))；(2)变质黄铁矿中钴、镍、砷、硒、铅、铜的含量远高于其他黄铁矿世代。我们认为，镁铁质岩浆作用是元店侵入焦岩中有毒元素的主要贡献者。
Pyrite, a mineral that can cause potential environmental issues in coal mining, is commonly found in coal seams around intrusions. In this paper, pyrites from the Yuandian Coal Mine (Huaibei Coalfield, Anhui, Eastern China) were studied using SEM, Raman and LA-ICP-MS. The pyrite morphologic and geochemical data suggest that (1) four pyrite generations are present (framboidal sedimentary pyrites (Py I) in the original coal, coarse-grained magmatic pyrites (Py II) in the intruding diabase, fine-grained metamorphic pyrites (Py III) in the intrusive contact aureole, and spheroid/vein hydrothermal pyrites (Py IV) in the cokeite); and (2) concentrations of cobalt, nickel, arsenic, selenium, lead and copper in the metamorphic pyrites are much higher than the other pyrite generations. We propose that mafic magmatism is the main contributor of the toxic elements to the intrusion-related cokeite at Yuandian.