Quartz grain surface features and mineralogy of sediments in the Sundarbans Forest site, Bangladesh: Constraints on the depositional environment and provenance

IF 1.827 Q2 Earth and Planetary Sciences Arabian Journal of Geosciences Pub Date : 2024-11-11 DOI:10.1007/s12517-024-12124-x
H. M. Zakir Hossain, Md. Aminul Islam, Anas Al Hossain, John S. Armstrong-Altrin, Farzana Yeasmin Nipa
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Abstract

An investigation on medium to coarse-grained quartz grains (QG) recovered from a ~ 100-m drilled core section of the Sundarbans Forest site in the southwestern Bangladesh was carried out to infer the source and depositional environment. Thirty-six microtextures were identified from 200 QG using a scanning electron microscopy (SEM). The QG surface features are categorized into mechanical (number of features n = 25), chemical (n = 5), and combined mechanical and chemical (n = 6), which provide invaluable insights on the transport mechanism, provenance, and depositional environment. Microtextures of mechanical origin include parallel striations, straight steps, crescentic percussion marks, conchoidal fractures, arcuate steps, fresh polished surfaces, V-shaped marks, broken edges, abrasion fatigue, and bulbous and meandering edges, which are more common in QG and ascribed to high-energy eolian and fluvial transports. The abundant chemical features such as crystalline overgrowth, silica globules, scaling, silica pellicle, and silica flower are omnipresent on QG surfaces, demonstrating a subaqueous diagenetic environment. Fracture plates/planes, high relief, elongated depressions, adhering particles, chatter marks, and oriented etch pits are common in the QG, suggesting a subaqueous nearshore marine environment. There is a high abundance of quartz (Si), feldspar (Na and K), titanite (Ti), and zircon (Zr) in the core sediments, indicating their derivation from felsic source rocks.

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孟加拉国孙德尔本斯森林遗址沉积物的石英颗粒表面特征和矿物学:沉积环境和产地的制约因素
研究人员对从孟加拉国西南部孙德尔本斯森林遗址约 100 米钻孔岩心部分采集的中粗粒石英颗粒(QG)进行了调查,以推断其来源和沉积环境。使用扫描电子显微镜(SEM)从 200 块 QG 中鉴定出 36 种微观纹理。QG 表面特征分为机械特征(特征数量 n = 25)、化学特征(n = 5)以及机械和化学相结合的特征(n = 6),这些特征为了解迁移机制、来源和沉积环境提供了宝贵的信息。机械微纹理包括平行条纹、直台阶、新月形冲击痕、海螺状断裂、弧形台阶、新鲜抛光面、V 形痕、断边、磨蚀疲劳以及球状和蜿蜒的边缘,这些在 QG 中较为常见,可归因于高能量的风化搬运和河流搬运。在 QG 表面,结晶过度生长、二氧化硅球、鳞片、二氧化硅胶粒和二氧化硅花等丰富的化学特征无处不在,显示了水下成岩环境。在 QG 中,断裂板/平面、高浮雕、拉长凹陷、附着颗粒、颤动痕迹和定向蚀坑十分常见,这表明了近岸海洋环境。岩芯沉积物中含有大量石英(Si)、长石(Na 和 K)、榍石(Ti)和锆石(Zr),表明它们来自长英质源岩。
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来源期刊
Arabian Journal of Geosciences
Arabian Journal of Geosciences GEOSCIENCES, MULTIDISCIPLINARY-
自引率
0.00%
发文量
1587
审稿时长
6.7 months
期刊介绍: The Arabian Journal of Geosciences is the official journal of the Saudi Society for Geosciences and publishes peer-reviewed original and review articles on the entire range of Earth Science themes, focused on, but not limited to, those that have regional significance to the Middle East and the Euro-Mediterranean Zone. Key topics therefore include; geology, hydrogeology, earth system science, petroleum sciences, geophysics, seismology and crustal structures, tectonics, sedimentology, palaeontology, metamorphic and igneous petrology, natural hazards, environmental sciences and sustainable development, geoarchaeology, geomorphology, paleo-environment studies, oceanography, atmospheric sciences, GIS and remote sensing, geodesy, mineralogy, volcanology, geochemistry and metallogenesis.
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