Analysis of the Fossilization Processes of Vicarya callosa japonica Shells Using Raman Micro-Mapping Combined with Principal Component Analysis and Partial Least Squares Regression.

IF 2.2 3区 化学 Q2 INSTRUMENTS & INSTRUMENTATION Applied Spectroscopy Pub Date : 2025-03-13 DOI:10.1177/00037028251322807
Yuki Tanaka, Kosuke Hashimoto, Toshiya Ichiki, Hidetoshi Sato, Yukihiro Ozaki, Motohiro Tsuboi
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Abstract

Micro-Raman spectroscopic analysis of a fossil sample of Vicarya callosa japonica was performed to investigate the chemical process of fossilization. The Vicarya sample, originating from the Miocene Katsuta Group, Okayama prefecture, southwestern Japan, had a conical shell body with multiple protuberances on the outer layer. The interior of the shell was filled with a carbonate sediment. Raman mapping combined with principal component analysis (PCA) and partial least squares regression (PLSR) analysis were performed on the sample. Well-preserved, in vivo aragonite was found to be distributed on the shell and near the boundary between the internal carbonate precipitates and the shell. The internal precipitates were composed of pure calcite and black carbonates. The black-colored precipitates contained pyrite, suggesting that the carbonates were derived from the same biogenic tissue as the carbonate concretions and were the starting point for their crystallization. The rapid formation of the precipitates, also similar to that of carbonate concretions, and the suppression of the demineralization effect of the shell from pore water in the sediment may have contributed to the preservation of the aragonite. The reaction of the transition from aragonite to calcite in the shell progressed to some extent and crystallization was completed before the transition to calcite was complete.

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为了研究化石形成的化学过程,研究人员对吠陀化石样本进行了显微拉曼光谱分析。该化石样本产自日本西南部冈山县中新世胜田组,壳体呈圆锥形,外层有多个突起。贝壳内部充满了碳酸盐沉积物。对该样品进行了拉曼图谱绘制以及主成分分析和偏最小二乘法回归分析。发现保存完好的活体文石分布在贝壳上以及内部碳酸盐沉淀物和贝壳之间的边界附近。内部沉淀物由纯方解石和黑色碳酸盐组成。黑色沉淀物中含有黄铁矿,这表明碳酸盐与碳酸盐凝结物来自同一生物组织,是其结晶的起点。沉淀物的快速形成也与碳酸盐凝块相似,沉积物中的孔隙水抑制了贝壳的脱矿作用,这可能是文石得以保存的原因。贝壳中文石向方解石过渡的反应在一定程度上进行,在向方解石过渡完成之前,结晶已经完成。
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来源期刊
Applied Spectroscopy
Applied Spectroscopy 工程技术-光谱学
CiteScore
6.60
自引率
5.70%
发文量
139
审稿时长
3.5 months
期刊介绍: Applied Spectroscopy is one of the world''s leading spectroscopy journals, publishing high-quality peer-reviewed articles, both fundamental and applied, covering all aspects of spectroscopy. Established in 1951, the journal is owned by the Society for Applied Spectroscopy and is published monthly. The journal is dedicated to fulfilling the mission of the Society to “…advance and disseminate knowledge and information concerning the art and science of spectroscopy and other allied sciences.”
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Analysis of the Fossilization Processes of Vicarya callosa japonica Shells Using Raman Micro-Mapping Combined with Principal Component Analysis and Partial Least Squares Regression. Confocal Raman Microscopy as a Probe of Material Deconstruction in Processed Low-Density Polyethylene Particles. Prominent Composition-Dependent Dynamics Decoupling in the Choline Chloride-Glycerol Deep Eutectic Solvent System. Real-Time Mapping of Polymer Film Thickness Using Near-Infrared Hyperspectral Imaging. Visualizing Molybdenum Pentachloride Flow During Vapor Deposition Processes Using Absorption Imaging.
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