Facies and statistical analyses of a crevasse-splay complex at the Tomisławice opencast lignite mine in central Poland

IF 0.9 Q3 GEOLOGY
Mariusz Dziamara, Paweł Kaczmarek, Jakub Klęsk, Robert Wachocki, Marek Widera
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Abstract

Abstract The studied crevasse-splay complex, situated within the 1st Mid-Polish lignite seam (MPLS-1), ranks amongst the best-developed and most readily accessible for direct research of all hard coal and lignite occurrences worldwide. The sandy-coaly sediments constituting it required a number of field and laboratory tests. However, the present article focuses solely on sedimentological and statistical analyses of sediments along a selected key section, the most important results of which are presented below. First of all, data obtained in previous sedimentological studies have been confirmed, in that individual segments of this complex represent both subaerial and subaqueous types of crevasse splays. On the one hand, their sediments are characterised by an extremely high content of coalified organic matter, reaching 20–40 wt.% in some samples; on the other, these crevasse splays are composed of fine sands with a median and mean grain size of 0.15 mm. In addition, the remaining statistical parameters (standard deviation, skewness and kurtosis) indicate a very good sorting of these sands, no significant so-called ‘tails’ and a better sorting close to the sediment mean grain size value, respectively.
波兰中部托米斯瓦维采露天褐煤矿区裂隙喷涌复合体的地貌和统计分析
摘要 所研究的裂隙-露头复合体位于波兰中部褐煤第一煤层(MPLS-1)内,是世界上所有硬煤和褐煤矿点中最发达、最容易直接研究的地区之一。构成该煤层的砂钙质沉积物需要进行大量的实地和实验室测试。不过,本文仅侧重于对所选关键地段沿线沉积物的沉积学和统计分析,下文将介绍其中最重要的结果。首先,以前的沉积学研究获得的数据得到了证实,即该综合体的个别地段既代表了地下裂缝,也代表了水下裂缝。一方面,其沉积物的特点是煤化有机物含量极高,在某些样本中达到 20-40 重量%;另一方面,这些裂缝裂口由细砂组成,中位和平均粒度为 0.15 毫米。此外,其余的统计参数(标准偏差、偏斜度和峰度)分别表明,这些沙子的分选效果非常好,没有明显的所谓 "尾巴",而且接近沉积物平均粒度值的分选效果更好。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Geologos
Geologos GEOLOGY-
CiteScore
1.70
自引率
0.00%
发文量
7
审稿时长
12 weeks
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