Reconnaissance exploration for gold in the Misaki area within the Iramba-Sekenke greenstone belt, central Tanzania

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dc.contributor.authorMpangile, Zortosy M
dc.contributor.authorMsabi, Michael M.
dc.contributor.authorKazimoto, Emmanuel O.
dc.date.accessioned2020-11-24T10:30:36Z
dc.date.available2020-11-24T10:30:36Z
dc.date.issued2020
dc.descriptionFull text article. Also available at https://journals.udsm.ac.tz/index.php/tjs/article/view/3273en_US
dc.description.abstractCombinations of geological, geophysical and geochemical techniques have been used to explore for gold deposits at Misaki within the Iramba-Sekenke Greenstone Belt in Singida region. The Misaki area is occupied by different rocks including homogeneous coarse-grained granite containing numerous xenoliths(>5 vol. %), tonalite, K-rich granite, pegmatite and dolerite dykes. All granitic rocks have been intruded by dolerite dykes, cut by epidote veins and are found juxtaposed to a tonalitic rock. Granitic rocks contain mainly anhedral to subhedral K-feldspar, plagioclase, quartz, biotite, hornblende, muscovite and opaque minerals, whereas tonalite contains similar minerals with relatively large amounts of plagioclase and mafic minerals (>10 wt. %; biotite, hornblende and opaque minerals) and no K-feldspar. The rocks are weakly foliated to massive and poikilitic. K-feldspar is perthitic, whereas plagioclases have cores with rim overgrowths. Chlorite, epidote and sericite in the rock formed at the expense of primary minerals under greenschist facies conditions. Geophysical datasets managed to identify lineaments that crosscut different rocks at Misaki, from which three (3) major structural trends have been recognized, which are NE-SW, NW-SE and ESE-WNW. Results from radiometric data mapped different lithological units by their different radiometric element contents (U, Th and K), distinguishing areas occupied by sediments or sedimentary rocks and those underlain by granitoid rocks. Soil geochemical survey have identified gold anomalies of up to 0.2ppm Au that in parts show strong affinity with Pb. Bismuth and arsenic were also found to be associated with Au in the soil. Gold anomalies when overlaid with magnetic lineaments indicate an association of gold with NE-SW trending lineaments. Results of this work call for a follow-up detailed geological mapping that would involve trenching and sampling of unweathered rocks,and documentation of geological structures to uncover potential gold deposits of the Misaki areawithin the Iramba-Sekenke Greenstone Belt.en_US
dc.identifier.citationMpangile, Z., Kazimoto, E., & Msabi, M. (2020). Reconnaissance exploration for gold in the Misaki area within the Iramba-Sekenke greenstone belt, central Tanzania. Tanzania Journal of Science, 46(1), 151-170.en_US
dc.identifier.issn2507-7961
dc.identifier.urihttp://hdl.handle.net/20.500.12661/2542
dc.language.isoenen_US
dc.publisherUniversity of Dar es Salaamen_US
dc.subjectGolden_US
dc.subjectGold explorationen_US
dc.subjectGold depositsen_US
dc.subjectMisakien_US
dc.subjectIramba-Sekenkeen_US
dc.subjectSekenkeen_US
dc.subjectIrambaen_US
dc.subjectGreenstoneen_US
dc.subjectGreenstone beltsen_US
dc.subjectGold anomaliesen_US
dc.subjectSingidaen_US
dc.titleReconnaissance exploration for gold in the Misaki area within the Iramba-Sekenke greenstone belt, central Tanzaniaen_US
dc.typeArticleen_US
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