Non-destructive Analytical Study of Raman Spectra Variations and Mechanisms of Calcite and Aragonite in Modern and Fossilized Oysters.

IF 2.2 3区 化学 Q2 INSTRUMENTS & INSTRUMENTATION
Yaxuan Han, Yukihiro Ozaki, Motohiro Tsuboi
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引用次数: 0

Abstract

Oyster fossils are some of the most common bivalve mollusk fossils found all over the world, they are different from other fossils because the oyster is still alive in the present day, and the body structure of modern oyster is almost the same as that of ancient one. Therefore, we designed a control experiment comparing the Raman spectra of minerals from both modern oysters and fossil oysters to explore the mechanism of oyster's fossilization process, which is considered to be helpful for investigating biological evolution or paleoenvironment. The oyster fossil sample was found in Nagi-Cho, Okayama Prefecture, Japan. We focused on the variations of band position and full width half-maximum of ν1 Raman band (symmetric stretching mode) of calcite (CaCO3) from modern and fossil oysters and the mineral conversion between calcite and aragonite (CaCO3) around the adductor muscle inside the oyster. Compared to modern oysters, the ν1 band at around 1086 cm-1 of calcite from oyster fossils shifted to a high wavenumber region, and the possible reason for this phenomenon is considered an elemental substitution between Ca2+ and Mg2+. As for aragonite around adductor muscle in fossil oysters, it has been found by Raman spectra that most of the aragonite has been converted into calcite because calcite has a relatively more stable structure.

现代和化石牡蛎中方解石和文石的拉曼光谱变化及机理的非破坏性分析研究
牡蛎化石是世界各地发现的最常见的双壳类软体动物化石之一,与其他化石不同的是,牡蛎至今仍然活着,而且现代牡蛎的身体结构与古代牡蛎几乎相同。因此,我们设计了一个对照实验,比较现代牡蛎和牡蛎化石中矿物的拉曼光谱,以探索牡蛎化石过程的机理,这被认为有助于研究生物进化或古环境。牡蛎化石样本发现于日本冈山县长町。我们重点研究了现代牡蛎和化石牡蛎方解石(CaCO3)ν1拉曼带(对称伸展模式)的波段位置和全宽半极大值的变化,以及牡蛎内收肌周围方解石和文石(CaCO3)之间的矿物转换。与现代牡蛎相比,牡蛎化石中方解石在 1086 cm-1 附近的 ν1 波段转移到了高文数区域,这一现象的可能原因被认为是 Ca2+ 和 Mg2+ 之间的元素置换。至于牡蛎化石内收肌周围的文石,拉曼光谱发现,由于方解石的结构相对更稳定,大部分文石已转化为方解石。
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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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