Changes in detrital garnet grain morphology and microtextures during fluvial transport in the Western Carpathians revealed by scanning electron microscopy and 3D model analysis: Implication for paleoenvironmental reconstruction

IF 2.7 2区地球科学 Q1 GEOLOGY

Sedimentary Geology Pub Date : 2024-04-26 DOI:10.1016/j.sedgeo.2024.106652

Katarína Bónová , Jozef Šupinský , Ján Bóna , Michaela Nováková , Juraj Šurka , Dušan Barabas

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引用次数: 0

Abstract

Siliciclastic grain surfaces preserve an information about mechanical transport effects and/or various chemical processes that the detritus has undergone. Weathering, transport, and diagenesis leave the clear traces that may be used to interpret the paleo-environmental conditions. We aimed to detail surface analysis of detrital garnet by the proven scanning electron microscopy (SEM), X-ray micro-tomography (XRT) and subsequent morphometric analysis of derived 3D surface model. We tracked garnet morphological and surface microtextural changes during fluvial transport in an active Beňatinská voda and Sobranecký potok streams in the Western Carpathians from the place of garnet removal from the host igneous rocks to the last appearance of its fragments in the fluvial sediments. Analysed garnet grains show a range of almost complete solid solution between almandine and grossular (Alm_70-73Grs_15-19Prp_5-6Sps_2-3Adr_0-3). Precise SEM analysis showed that conchoidal fractures, straight and arcuate steps, crescentic percussion marks and V-shaped cracks are main mechanical fluvial microtextures, whilst 3D surface models derived from XRT provided the information that no relationship between mechanical surface-microtextural development and mineral inclusion distribution exists. Thus, the presence of inclusions and their proximity to the grain surface have no influence on garnet destruction during its fluvial transport. Morphometric variables such as surface roughness and curvatures derived from 3D garnet model can be used to distinguish between mechanical impacts and corrosion-induced depressions. The results related to detritus behaviour in the modern streams are applicable to the ancient fluvial sediment research and can help to correctly reconstruct the paleoenvironmental and paleogeographic conditions in various areas.

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通过扫描电子显微镜和三维模型分析揭示西喀尔巴阡山脉流体搬运过程中的碎屑石榴石晶粒形态和微质地的变化：对古环境重建的影响

硅质岩晶粒表面保留了有关碎屑经历的机械搬运效应和/或各种化学过程的信息。风化、迁移和成岩过程会留下清晰的痕迹，可用于解释古环境条件。我们旨在通过成熟的扫描电子显微镜（SEM）和 X 射线微层析成像（XRT）对碎屑石榴石进行详细的表面分析，并随后对得出的三维表面模型进行形态计量分析。我们跟踪了西喀尔巴阡山脉活跃的 Beňatinská voda 和 Sobranecký potok 溪流中石榴石形态和表面微纹理在流体搬运过程中的变化，从石榴石从主火成岩中剥离到其碎片最后出现在流体沉积物中。经过分析的石榴石颗粒显示出几乎完全固溶的范围，介于白榴石和毛榴石之间（AlmGrsPrpSpsAdr）。精密的扫描电镜分析表明，海螺状断裂、直线和弧形台阶、新月形冲击痕和 V 形裂缝是主要的机械河道微纹理，而 XRT 得出的三维表面模型提供的信息表明，机械表面-微纹理的发展与矿物包裹体的分布之间不存在任何关系。因此，夹杂物的存在及其与晶粒表面的接近程度对石榴石在流体搬运过程中的破坏没有影响。三维石榴石模型得出的表面粗糙度和曲率等形态变量可用于区分机械冲击和腐蚀引起的凹陷。与现代溪流中碎屑行为有关的结果适用于古代河流沉积物研究，有助于正确重建不同地区的古环境和古地理条件。

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来源期刊

Sedimentary Geology 地学-地质学

CiteScore

5.10

自引率

7.10%

发文量

133

审稿时长

32 days

期刊介绍： Sedimentary Geology is a journal that rapidly publishes high quality, original research and review papers that cover all aspects of sediments and sedimentary rocks at all spatial and temporal scales. Submitted papers must make a significant contribution to the field of study and must place the research in a broad context, so that it is of interest to the diverse, international readership of the journal. Papers that are largely descriptive in nature, of limited scope or local geographical significance, or based on limited data will not be considered for publication.