Mineralogical characterization of fossil woods from the Las Cañas Formation (early Pliocene), Santiago del Estero, Argentina, mainly using SEM and EDX, XRD, FTIR and Confocal Raman spectroscopy

IF 1.5 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Journal of South American Earth Sciences Pub Date : 2025-07-12 DOI:10.1016/j.jsames.2025.105679

E. Baez , A. Crisafulli , A. Kanbour , E. Figueredo

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Abstract

This study conducted physicochemical and mineralogical characterization of fossil angiosperm woods, from Neogene fluvial sedimentary deposits of the Dulce River (Termas de Río Hondo Sector), Santiago del Estero Province, Argentina. Chemical and instrumental analyses demonstrated that the early Pliocene specimens comprise extensively mineralized silica polymorphs. In this work, X-ray diffraction (XRD) techniques combined with scanning electron microscopy (SEM) with backscattered electron detector (BSE) and spectroscopic techniques such as energy dispersive X-ray (EDX), confocal Raman (CRS) and Fourier transform infrared (FTIR) were applied. This research includes not only the physicochemical characterization of angiospermic logs, especially the indeterminate species of Vitaceae (Vitaceoxylon sp.) and Menendoxylon mesopotamiensis, but also studies the analysis of the regional geological environment that allows paleoenvironmental, paleoclimatic and paleobiogeographic inferences for the neogenic xylotaphoflora related to the outcrops of the Dulce River, in the transition between the Pampean Sierras of the Northwest (NW) and the basin of the Chaco-Pampean Plain, Argentina.

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阿根廷Santiago del Estero Las Cañas组（上新世早期）化石木材的矿物学表征，主要采用SEM、EDX、XRD、FTIR和共聚焦拉曼光谱

本研究对阿根廷圣地亚哥德尔埃斯特罗省杜尔西河（Termas de Río Hondo Sector）新近纪河流沉积沉积物中的被子植物化石进行了物化学和矿物学表征。化学和仪器分析表明，上新世早期样品包含广泛矿化的硅多晶岩。在这项工作中，x射线衍射（XRD）技术结合扫描电子显微镜（SEM）与背散射电子探测器（BSE）和光谱技术，如能量色散x射线（EDX），共聚焦拉曼（CRS）和傅里叶变换红外（FTIR）。本研究不仅包括被子植物原木的物化特征，特别是对尚不确定的Vitaceae （Vitaceoxylon sp.）和Menendoxylon mesopotamiensis的物化特征，而且还研究了区域地质环境分析，为与杜塞河露头有关的新生木藻群提供了古环境、古气候和古生物地理推断。位于西北部潘潘亚山脉和阿根廷查科-潘潘亚平原盆地之间的过渡地带。

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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.