孟加拉沙贾拉尔科技大学Md Shofiqul Islam研究团队，报道了杜丕提拉组岩石学与地球化学。该研究于2025年1月22日发表于《地球化学学报》。

对Sylhet海槽碎屑砂岩模式的综合研究揭示了亚岩屑到亚长石石英砂岩的多种类型。研究人员在孟加拉国的Dupi Gaon （Jaintiapur）收集了土壤样本，随后进行了全面的分析，包括实地检查、x射线衍射（XRD）、x射线荧光（XRF）、岩石学和重矿物浓度分析。实地观察发现，土壤样品从白色到淡黄色到杂色，厚度从15cm到约4m不等，表现出中等柔软性。XRF分析显示，样品中SiO2、Al2O3和Fe2O3含量显著，锆（Zr）和铜（Cu）浓度持续较高。

XRD分析表明，石英是主要的矿物，还有红云母、黑云母以及金红石和磁铁矿等辅助矿物。岩石学分析强调石英占主导地位，裂缝表明构造影响，而重矿物分离技术鉴定出锆石、石榴石、针铁矿、金红石和磁铁矿。

这些发现为研究杜皮提拉组的沉积物源、沉积过程和环境条件提供了新的思路。整体岩石的综合地球化学资料表明，沉积物主要来源于长英质浅成岩，表明浅成岩区风化程度中等至高度。

总的来说，分析表明了Dupi Tila组的原位起源，母质主要是碎屑而不是自生物质，碎屑石英的存在和沉积环境的评估支持了这一观点，为该时代的地质条件和沉积物的潜在运输方式提供了见解。

附：英文原文

Title: Petrography and geochemistry of the Dupi Tila formation: Implications for depositional environment and tectonics

Author: Sultana, Ummae Habiba, Islam, Md Shofiqul, Jolly, Yesmin Nahar, Mamun, K. M., Akter, Shirin, Faruk, Muhammad Omar, Anzuman, Maliha, Karim, Md Masud

Issue&Volume: 2025-01-22

Abstract: A comprehensive examination of detrital sandstone modes from the Sylhet Trough reveals a diverse range of sub-lithic to sub-feldspathic quartz arenites. Soil samples were gathered from Dupi Gaon (Jaintiapur) in Bangladesh, followed by a thorough analysis using field examination, X-ray diffraction (XRD), X-ray fluorescence (XRF), petrography, and heavy mineral concentration analyses. Field observations revealed the soil sample varying from white to yellowish to variegated, with thicknesses ranging from 15 cm to about 4 m, and exhibiting moderate softness. XRF analysis revealed significant SiO2, Al2O3, and Fe2O3 levels in the samples, with zirconium (Zr) and copper (Cu) showing consistently high concentrations. XRD analysis identified quartz as predominant, along with muscovite, biotite, and accessory minerals like rutile and magnetite. Petrographic analysis highlighted quartz as dominant, with fractures suggesting tectonic influences, while heavy mineral separation techniques identified zircon, garnet, goethite, rutile, and magnetite. These findings provide insights into sediment provenance, depositional processes, and environmental conditions during the formation of the Dupi Tila Formation. The comprehensive geochemical data of the entire rock indicates that most of the sediments originated from felsic igneous sources, and also suggests a moderate to high level of weathering in the source region. Overall, the analyses suggested an in situ origin of the Dupi Tila Formation, with parent materials being predominantly detrital rather than authigenic, supported by the presence of detrital quartz and an assessment of the depositional environment, providing insights into the geological conditions of the era and potential modes of sediment transportation.

DOI: 10.1007/s11631-024-00754-7

Source: https://link.springer.com/article/10.1007/s11631-024-00754-7