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Isotope geochemistry as a tool in the exploration of gold occurrences in Ghana: a review
Arabian Journal of Geosciences Pub Date : 2021-09-12 , DOI: 10.1007/s12517-021-08297-4
Raymond Webrah Kazapoe 1, 2 , Okunlola Olugbenga 2, 3 , Olusegun Olisa 2 , Emmanuel Arhin 4
Affiliation  

The use of stable isotopes in other gold provinces around the world shows the usefulness of this method as a complementary tool in locating Mineralization in areas lacking visible alteration where delineation of mineralization has increasingly been a challenge. This paper reviews the use of stable isotope geochemistry in mineral exploration and discusses its possible application in the Birimian of Ghana as an auxiliary exploration technique. The types of samples utilized in the reviewed studies were bulk rock samples, mineral veins, and mineral separates. The mineralized terranes in Ghana have δ18O values falling between 13 and 21‰. The unmineralized terrane in Ghana however recorded a relatively depleted range of δ18O values between 9 and 13‰. Values from the mineralized terrane in Ghana recorded a comparably wider range of δ13C values between −15 and 11‰. This is in contrast to a narrower range of δ13C values between −3 and 1‰ recorded in the unmineralized terrane. δ34S values from the mineralized terrane in Ghana documented values of −20‰ and 8. These values revealed a discernible isotopic shift between the mineralized and non-mineralized terrane which points to the potential success for such a methodology in the Birimian of Ghana. However, due to the difficulty in recognizing rocks whose stable isotopes have been altered by metamorphic processes coupled with challenges in data interpretation, it would be more suiting to use stable isotopes method in association with other techniques such as lithogeochemistry and geophysical datasets to help better constrain the isotopic signature of the mineralization.



中文翻译:

同位素地球化学作为勘探加纳金矿床的工具:综述

在世界其他黄金产区使用稳定同位素表明,该方法作为一种补充工具的有用性,可用于在缺乏可见蚀变的地区定位矿化,而在这些地区,矿化的描绘日益成为一个挑战。本文回顾了稳定同位素地球化学在矿产勘探中的应用,并讨论了其作为辅助勘探技术在加纳 Birimian 中的可能应用。审查研究中使用的样品类型是大块岩石样品、矿脉和矿物分离物。加纳矿化地体的 δ 18 O 值介于 13 到 21‰之间。然而,加纳的未矿化地体记录的 δ 18范围相对较弱O 值在 9 到 13‰之间。来自加纳矿化地体的值记录的 δ 13 C 值范围相对较宽,介于 -15 到 11‰ 之间。这与未矿化地体中记录的更窄范围的 δ 13 C 值形成对比,介于 -3 和 1‰ 之间。δ 34来自加纳矿化地体的 S 值记录的值为 -20‰ 和 8。这些值揭示了矿化地体和非矿化地体之间可辨别的同位素变化,这表明这种方法在加纳的 Birimian 中可能取得成功。然而,由于变质过程改变了稳定同位素的岩石难以识别,加上数据解释方面的挑战,更适合将稳定同位素方法与其他技术(如岩石地球化学和地球物理数据集)结合使用,以帮助更好地约束矿化的同位素特征。

更新日期:2021-09-12
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