Thermal-induced crystallographic transformation in shells of Mytilus galloprovincialis Lamarck, 1819

IF 2.6 2区 地球科学 Q2 GEOGRAPHY, PHYSICAL Palaeogeography, Palaeoclimatology, Palaeoecology Pub Date : 2024-10-02 DOI:10.1016/j.palaeo.2024.112523
Liang Hu , Matthias Alberti , Ying Tian , Zheng Fang , Yanhong Pan
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Abstract

Biominerals in hard parts are widely used as paleoenvironmental archives, employing proxies such as elemental and isotopic composition, microstructure, and crystallography. However, the effective selection and application of these proxies in fossil materials depends on their preservational potential. Here we evaluated the preservational potential of these proxies through controlled experiments on bivalves, one of the commonly used fossils in paleoenvironmental reconstructions. We utilized cultured Mytilus galloprovincialis specimens at five controlled temperatures to investigate the impact of elevated temperatures on various proxies extracted from both aragonitic and calcitic components of the same shell, including isotopic composition, microstructure and crystallography. Elevated temperatures first induced changes in the oxygen isotope composition (in both aragonite and calcite), followed by modification in aragonitic parts, such as changes in the aragonite phase, textures, nacre microstructure, and grain size of aragonite crystals. Despite aragonite's susceptibility to temperature, the microstructure and texture of calcite remained largely unaltered, demonstrating significantly higher resilience. Our findings emphasize the preservational potential of different shell proxies under heat exposure, ranging from oxygen isotopes to microstructure and texture. A ranking of preservation potential provides a practical guide for selecting well-preserved specimens, as textures and microstructures are not always reliable indicators. In distinguishing aragonite from calcite in fossils, our study pioneers a new avenue by proposing the analysis of high-angle boundary (HAB) content, including twin boundaries, as a reference for altered aragonite.
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拉马克(1819 年)贻贝贝壳中的热诱导结晶转变
硬质部分的生物矿物被广泛用作古环境档案,采用的代用指标包括元素和同位素组成、微观结构和晶体学。然而,化石材料中这些代用指标的有效选择和应用取决于它们的保存潜力。在这里,我们通过对双壳类动物(古环境重建中常用的化石之一)进行对照实验,评估了这些代用指标的保存潜力。我们利用在五种可控温度下培养的贻贝标本,研究了高温对从同一贝壳的文石和钙质成分中提取的各种代用指标的影响,包括同位素组成、微观结构和晶体学。温度升高首先导致氧同位素组成(文石和方解石)发生变化,随后文石部分发生变化,如文石相、纹理、珍珠质微观结构和文石晶体晶粒大小的变化。尽管文石易受温度影响,但方解石的微观结构和纹理基本上没有改变,显示出明显更高的复原力。我们的发现强调了不同贝壳代用指标在热暴露条件下的保存潜力,包括氧同位素、微观结构和质地。由于纹理和微观结构并不总是可靠的指标,因此对保存潜力的排序为选择保存完好的标本提供了实用指南。在区分化石中的文石和方解石方面,我们的研究开辟了一条新途径,提出了分析高角度边界(HAB)含量(包括孪生边界)作为蚀变文石的参考的方法。
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来源期刊
CiteScore
5.90
自引率
10.00%
发文量
398
审稿时长
3.8 months
期刊介绍: Palaeogeography, Palaeoclimatology, Palaeoecology is an international medium for the publication of high quality and multidisciplinary, original studies and comprehensive reviews in the field of palaeo-environmental geology. The journal aims at bringing together data with global implications from research in the many different disciplines involved in palaeo-environmental investigations. By cutting across the boundaries of established sciences, it provides an interdisciplinary forum where issues of general interest can be discussed.
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