Estimations of Clarkes for Carbonaceous biolithes: World averages for trace element contents in black shales and coals
Estimations of Clarkes for Carbonaceous biolithes: World averages for trace element contents in black shales and coals
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DOI：
10.1016/j.coal.2009.01.002
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发表时间：
2009-04-01
影响因子：
5.6
通讯作者：
Yudovich, Ya. E.
中科院分区：
文献类型：
--
作者：
Ketris, M. P.;Yudovich, Ya. E.
黑色页岩和煤的克拉克值是世界黑色页岩和煤中微量元素的平均含量。这些计算是在俄罗斯的地球化学中进行的，但到目前为止，西方对此知之甚少。基于大量信息的综合计算(对黑色页岩、煤和煤灰中的微量元素进行了数千次分析)，给出了现代黑色页岩和煤克拉克的表格。在黑色页岩地球化学中，计算了每种主要岩性的三个数字：陆源(+凝灰岩)、硅质岩和碳酸盐。提出了两种Clarke估计，分别命名为“岩性”(K-1)和“岩性地层”(K-2)。在煤的地球化学中，对每一种微量元素计算了7个数字：硬煤及其灰分的平均含量；褐煤及其灰分的平均含量；所有煤及其灰分的平均含量；以及煤亲和力指数(或“亲煤指数”)=所有灰分的平均含量/沉积岩的克拉克值。这里展示的黑色页岩和煤克拉克为许多地球化学对比和问题提供了重要的科学基础。(C)2009爱思唯尔B.V.保留所有权利。
Black shale and coal Clarke values are the average trace element contents in the World black shales and coals. These calculations are made in Russian geochemistry but up to now are poorly known in the West. Modern tables of black shale and coal Clarkes are presented, based on comprehensive calculations using very large amount of information (thousands analyses of black shales, coals, and coal ashes for trace elements). In black shale geochemistry, three figures were calculated for each main lithologies: terrigenous (+tuff), chert, and carbonate. Two Clarke estimations are presented, named "lithological" (K-1) and "lithostratigraphical" (K-2). In coal geochemistry, seven figures were calculated for each trace element: average content in hard coals and their ashes; average content in brown coals and their ashes; average content in all coals and their ashes: and coal affinity index (or "coalphile index")=average content in all ashes/Clarke values of sedimentary rocks. The black shale and coal Clarkes presented here provide an important scientific base for many geochemical comparisons and issues. (C) 2009 Elsevier B.V. All rights reserved.