Mineralogy and Geochemistry of Hydrothermally altered Talcose rocks from Ila Orangun-Oyan areas, part of Southwestern Nigeria
| العنوان: | Mineralogy and Geochemistry of Hydrothermally altered Talcose rocks from Ila Orangun-Oyan areas, part of Southwestern Nigeria |
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| المؤلفون: | V B Omotunde lowast, Maryam O. Abdus-Salam, O. A. Afolabi, Akinade S. Olatunji, O. A. Ehinola, O J Olajide Kayode nbsp |
| المصدر: | Indian Journal of Science and Technology. 13:4244-4261 |
| بيانات النشر: | Indian Society for Education and Environment, 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | Multidisciplinary, Greenschist, Schist, Geochemistry, Mineralogy, engineering.material, Actinolite, Ultramafic rock, Magma, engineering, Plagioclase, Protolith, Geology, Metamorphic facies |
| الوصف: | Background/Objectives: Talcose rocks within Precambrian Basement Complex serve as relics of Archean greenstones. alterations associated with polycyclic-orogenies that affected this complex is studied to understand mineralogical and geochemical alterations. Methods: Five fresh samples of talcose rocks were collected during field mapping. These samples were cut into thin sections to reveal modal mineralogy, altered minerals and degree of alteration of such minerals. Mineral phase identification of the talcose rocks was conducted using X-ray Broker D8 ADVANCE diffractometer while whole rock analysis was carried out using Inductively Coupled Plasma Mass Spectrometry. Findings: Lithological relationship revealed from field evidence showed that the talc bodies occurred in close association with micaceous schist. The mineral assemblage of talc, tremolite, actinolite, chlorite and calcite suggest low grade greenschist metamorphic facies from possible hydrothermal alteration. Geochemical results revealed the following range of concentrations; SiO2 42.19-59.03%; Al2O3 1.1 - 11.8%; Fe2O3 7.64-9.56%; MgO 24.47-26.639%; Ni 594-1207ppm; Co 43.2-113.9ppm; Sn 6-41ppm; V 32-75ppm and Zr 1.3-58.7ppm, and these are typical of talcose rocks. Petrogenetic studies suggest a komatiitic origin with a peridotitic komatiite precursor for the talc-chlorite-tremolite schist. Enrichment in LREE, depletion in HREE and a negative Eu anomaly suggest alteration of the parent magma for the talcose rock and plagioclase fractionation. The trends observed for the LILE, HFSE and REE suggest possible contamination or mixing of crustal and mantle materials during the formation of the protolith. Ni and Co concentrations are higher than average crustal values with implication for ultrabasic to basic magma composition for the komatiitic progenitor and also suggestive of possible mineralisation. Conclusion: Mineralogical examination has revealed a talc-chlorite-tremolite composition for the talcose rocks with peridotitic komatiite precursory while geochemical composition supported ultrabasic magmatism similar to those with the Ilesha schist belt.Keywords: Ila Orangun-Oyan; Talcose rocks; Hydrothermal alteration; Peridotitic Komatiite; Ilesha schist belt |
| تدمد: | 0974-5645 0974-6846 |
| DOI: | 10.17485/ijst/v13i40.1686 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::9efc6ae7b36434093ed2ea05d1dffc1e https://doi.org/10.17485/ijst/v13i40.1686 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi...........9efc6ae7b36434093ed2ea05d1dffc1e |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 09745645 09746846 |
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| DOI: | 10.17485/ijst/v13i40.1686 |