Estimating the degree of mudstone compactional thinning : Empirical relationship between mudstone compaction and geochemical composition
Estimating the degree of mudstone compactional thinning : Empirical relationship between mudstone compaction and geochemical composition
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估算泥岩压实减薄程度：泥岩压实与地球化学成分之间的经验关系
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
M. Inui
中科院分区：
文献类型：
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作者：
K. Izumi;Ryota Suzuki;M. Inui
首次提出了全固结泥岩的压实减薄程度与地球化学成分之间的经验关系。通过对日本高知县始新世Naharigawa组泥岩样品的沉积学、遗迹学和地球化学分析，提供了新的资料。根据这些分析，计算出Naharigawa泥岩的压实度（缩短百分比（Cms））为83.01%。为了定量地估计经验关系，进一步计算和编制了各种泥岩的Cms值，其地球化学成分是由以前的研究提供的。汇编的结果是，Cms值和CaO丰度之间存在显著和强烈的负相关性（r =-0.75;p<0.05）。此外，CMS值显示负相关的钙浓度归一化为陆源物质（CaO/Al 2 O3，CaO/TiO 2），被认为是代理的非陆源（即生物）碳酸盐的相对贡献，虽然公认的相关性是没有统计学意义。这些证据有力地表明，泥质沉积物的物理压实程度受碳酸盐含量的影响。虽然所得到的关系可能只适用于完全固结的泥岩的古近纪或更老的年龄，这是非常有帮助的定量估计的程度，任何泥岩发育的继承，只要确定的主要元素组成的泥岩。
The empirical relationship between the degree of compactional thinning and geochemical composition for fully consolidated mudstones was proposed for the first time. New data were provided by sedimentological, ichnological, and geochemical analyses of the mudstone samples from the Eocene Naharigawa Formation, Kochi Prefecture, Japan. Based on these analyses, the degree of compaction of the Naharigawa mudstones as a percentage of shortening (Cms) was calculated as 83.01 %. To quantitatively estimate the empirical relationship, the Cms values for various mudstones, whose geochemical compositions are available by previous studies, were further calculated and compiled. As a result of the compilation, a significant and strong negative correlation between the Cms values and CaO abundances (r =−0.75;p<0.05) was recognized. Furthermore, the Cms values show negative correlation between Ca concentrations normalized to terrigenous material (CaO/Al2O3, CaO/TiO2) that are considered as proxies for relative contribution of non-terrigenous (i.e. biogenic) carbonates, although the recognized correlations are not statistically significant. These lines of evidence strongly suggest that the degree of physical compaction of muddy sediments is affected by carbonate contents. Although the obtained relationship may hold only for fully consolidated mudstones of the Paleogene or older ages, it is very helpful for quantitatively estimating the degree of compactional thinning for any mudstonedominated succession, as long as the major element composition of the mudstone is determined.