Characterization of intrusive rocks and REE geochemistry of coals from the Zhuji Coal Mine, Huainan Coalfield, Anhui, China
Characterization of intrusive rocks and REE geochemistry of coals from the Zhuji Coal Mine, Huainan Coalfield, Anhui, China
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安徽淮南煤田诸暨煤矿煤岩侵入岩及稀土地球化学特征
DOI：
10.1016/j.coal.2011.06.012
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发表时间：
2012-05
影响因子：
5.6
通讯作者：
Zheng, Liugen
中科院分区：
文献类型：
--
作者：
Liu, Guijian;Sun, Ruoyu;Chou, Chen-Lin;Zheng, Liugen
煤中稀土元素（REE）含量是研究烃源岩演化、沉积环境、后成构造活动及火成岩侵入作用的重要信息来源。本研究在安徽淮南煤田朱集煤矿29个钻孔中采集了186个煤样、11个受侵入影响的煤样、4个具有侵入岩代表性的煤样、1个煤顶和1个分离样。主要目的是对含煤层序中的侵入岩进行表征，并研究煤中稀土元素参数与烃源岩、沉积环境、局部断裂、火成岩侵入体和煤层厚度的相关性。在含煤地层中发现了从基底到上的酸性-基性侵入岩序列，可能对应于花岗岩、闪长岩/二长岩和辉长岩的不同侵入期次。轻稀土元素（LREE）和重稀土元素（HREE）的REE含量和分馏程度均从酸性岩向基性岩增加。大多数岩石的Ce含量较低，而Eu含量较低。渣集矿煤中稀土元素的平均含量为118μg/g，与中国最近更新的平均值基本一致，但显著高于全球平均值。侵入影响煤的稀土元素含量与其他煤的稀土元素含量差异不显著（P=0.2），火成岩的稀土元素含量与侵入影响煤的稀土元素含量关系不明显。沉积环境和烃源岩是成煤盆地稀土元素的主要贡献源。断层影响钻孔煤中稀土元素含量高于其他钻孔，这种趋势在上层煤层中更为明显。成煤物质中重、轻稀土的分异程度随煤层厚度的增加而增大。
Rare earth element (REE) concentrations in coals are a source of information relevant to the evolution of source rocks, depositional environment, and epigenetic tectonic activity as well as the effects of igneous intrusions. In this study, 186 coal samples, 11 intrusion-affected coal samples, 4 samples representative of the intrusive rocks, one coal roof and one parting samples were collected from 29 boreholes at the Zhuji coal mine, Huainan Coalfield, Anhui Province, China. The main objective is to characterize the intrusive rocks in the coal-bearing sequence and to investigate the correlation of REE parameters in the coals with the source rocks, depositional environment, localized faults, igneous intrusions, and thickness of the coal beds. A sequence (from base to top) of acidic to basic intrusive rocks through the coal-bearing strata was identified, which possibly corresponds to different intrusive episodes of granite, diorite/monzonite and gabbro. Both the REE contents and degree of fractionation of light rare earth elements (LREE) and heavy rare earth elements (HREE) increase from acidic to basic rocks. Most rocks are slightly depleted in Ce but highly depleted in Eu. The REE concentrations in coals from the Zhuiji mine (average of 118μg/g) are nearly identical to recently-updated average Chinese values, but significantly higher than global values. The REE content of the intrusion-affected coals is not distinctively different from that of the other coals (P=0.2), and REE concentrations of the igneous rocks appear to have no clear relationship to those of the intrusion-affected coals. The depositional environment and source rocks are presumably the main REE contributors to the coal-accumulation basin. The REE content in coals from fault-affected boreholes is higher than that in other boreholes and this trend is stronger in the coal seams of the upper strata. The HREE tend to be incorporated into thinner coal seams and the degree of fractionation between LREE and HREE of the coal-forming materials increases with coal thickness.
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影响因子：
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作者：
Fang Shi-hu;Jia Cheng-zao;Song Yan;Xu Huai-min;Liu Lou-jun
通讯作者：
Fang Shi-hu;Jia Cheng-zao;Song Yan;Xu Huai-min;Liu Lou-jun
影响因子：
5.6
作者：
Ketris, M. P.;Yudovich, Ya. E.
通讯作者：
Yudovich, Ya. E.
影响因子：
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作者：
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通讯作者：
I. Graham;R. Pogson;D. Colchester;J. Hergt;Rod Martin;P. Williams
影响因子：
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作者：
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通讯作者：
S. Dai;Yiping Zhou;Mingquan Zhang;Xibo Wang;Jumin Wang;Xiaolin Song;Yao-fa Jiang;Yangbing Luo-
影响因子：
5.6
作者：
V. V. Seredin-V.
通讯作者：
V. V. Seredin-V.