Posušje bauxites in Bosnia and Herzegovina: A source of critical raw materials and a paleoclimatic marker

Review of the Bulgarian Geological Society Pub Date : 2023-12-01 DOI:10.52215/rev.bgs.2023.84.3.133

I. Peytcheva, Šime Bilić, Stoyan Georgiev, Ivica Pavičić, F. Šumanovac, A. Hikov, Marko Holma, M. Guillong, Ivan Grubišić

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Abstract

The present study provides geochemical and geochronological data about Posušje bauxites in Bosnia and Herzegovina with the aim to characterize them as Critical Raw Materials (CRMs) sources and to put constraints on the time and genesis of the deposit. Boehmite is the bauxites’ main Al-bearing mineral, while gibbsite is a minor constituent. Hematite is the dominant Fe-phase, whereas goethite is rare. The chemical analyses indicate that the Al2O3 content ranges from 49.6 to 63.0 wt %, Fe2O3 varies from 16.5 to 33.7 wt % and the SiO2 content is usually <0.5 wt %. TiO2 content ranges between 2.6 and 3.2 wt %. Typical trace elements are V (353–787 ppm), Cr (498–1055 ppm), Zr (382–558 ppm), Sc (42–72 ppm), and Ga (40–47 ppm). The sum of REEs is 357–1112 ppm. The U-Pb zircon dating indicates an age of Posušje bauxite formation at 56.6±0.5 Ma. This age closely aligns with the global climatic event that occurred approximately 56 Ma ago, called Paleocene–Eocene Thermal Maximum (PETM).

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波斯尼亚和黑塞哥维那的 Posušje 铝土矿：关键原材料的来源和古气候标记

本研究提供了有关波斯尼亚和黑塞哥维那 Posušje 铝土矿的地球化学和地质年代数据，旨在确定其作为关键原材料（CRMs）来源的特征，并对矿床的时间和成因加以限制。沸石是铝土矿的主要含铝矿物，而辉绿岩是次要成分。赤铁矿是主要的铁相，而高铁铁则很少见。化学分析结果表明，Al2O3 含量在 49.6 至 63.0 wt % 之间，Fe2O3 含量在 16.5 至 33.7 wt % 之间，SiO2 含量通常小于 0.5 wt %。TiO2 含量介于 2.6 和 3.2 重量百分比之间。典型的微量元素为 V（353-787 ppm）、Cr（498-1055 ppm）、Zr（382-558 ppm）、Sc（42-72 ppm）和 Ga（40-47 ppm）。REEs 的总和为 357-1112 ppm。U-Pb 锆石年代测定表明，Posušje 铝土矿的形成年代为 56.6±0.5 Ma。这一年龄与大约 56 Ma 前发生的全球气候事件（即古新世-始新世热极盛期 (PETM)）密切吻合。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Review of the Bulgarian Geological Society

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