Spectroscopic and SEM-EDS studies of gymnosperm wood from the Upper Permian Tacuary Formation, Paraguay

IF 1.5 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Journal of South American Earth Sciences Pub Date : 2025-07-07 DOI:10.1016/j.jsames.2025.105681

E. Baez , A. Crisafulli , A. Kanbour , P. Zuliani

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Abstract

The mineralogical study and physicochemical characterization of petrified woods from the Tacuary Formation (Upper Permian) were conducted using samples from Arroyo Vino, Guairá Department. The methodologies included local observations, sampling, macroscopic observation, petrographic microscopy, scanning electron microscopy (SEM) with an energy-dispersive X-ray spectrometer (EDS), Confocal Raman Spectroscopy (CRS), and geographic information systems (GIS). Polymorphs of silica and heavy metal minerals were identified. This research detected the presence of iron, nickel, chromium, and traces of strontium, germanium, rhenium, and other transition metals. Additionally, the mineralization processes in fossil woods of the Tacuary Formation were interpreted in relation to the Guairá Basin, aiming to consider palaeobotanical aspects, infer the palaeoenvironment, the prevailing palaeoclimate in Eastern Paraguay, and highlight the palaeobiogeographical distribution of the taxon.

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巴拉圭上二叠统Tacuary组裸子植物木材的光谱和SEM-EDS研究

利用guair地区Arroyo Vino的样品，对上二叠统Tacuary组的石化木材进行了矿物学研究和物化特征分析。方法包括局部观测、取样、宏观观测、岩相显微镜、扫描电子显微镜（SEM）与能量色散x射线光谱仪（EDS）、共聚焦拉曼光谱（CRS）和地理信息系统（GIS）。鉴定了二氧化硅和重金属矿物的多态性。这项研究检测到了铁、镍、铬的存在，以及微量的锶、锗、铼和其他过渡金属。此外，结合瓜伊尔盆地，对Tacuary组化石木材的矿化过程进行了解释，目的是考虑古植物学方面的因素，推断巴拉圭东部的古环境和古气候，突出该分类群的古生物地理分布。

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来源期刊

Journal of South American Earth Sciences 地学-地球科学综合

CiteScore

3.70

自引率

22.20%

发文量

364

审稿时长

6-12 weeks

期刊介绍： Papers must have a regional appeal and should present work of more than local significance. Research papers dealing with the regional geology of South American cratons and mobile belts, within the following research fields: -Economic geology, metallogenesis and hydrocarbon genesis and reservoirs. -Geophysics, geochemistry, volcanology, igneous and metamorphic petrology. -Tectonics, neo- and seismotectonics and geodynamic modeling. -Geomorphology, geological hazards, environmental geology, climate change in America and Antarctica, and soil research. -Stratigraphy, sedimentology, structure and basin evolution. -Paleontology, paleoecology, paleoclimatology and Quaternary geology. New developments in already established regional projects and new initiatives dealing with the geology of the continent will be summarized and presented on a regular basis. Short notes, discussions, book reviews and conference and workshop reports will also be included when relevant.