3D modeling of the Ashanti Belt, southwest Ghana: Evidence for a litho-stratigraphic control on gold occurrences within the Birimian Sefwi Group
作者： S. Perrouty , M.D. Lindsay , M.W. Jessell , L. Aillères , R. Martin
DOI: 10.1016/J.OREGEOREV.2014.05.011
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摘要: Abstract A three-dimensional model of the gold-rich Paleoproterozoic Ashanti Greenstone Belt has been built with a “hybrid” geological modeling method using Geomodeller and Gocad, then inverted VPmg software. The helps to identify main regional-scale controls leading abundant gold mineralization in southeast belt by highlighting lithological distribution geometry structures. shows that 85% occurrences are proximal specific tholeiitic metabasaltic horizon “BV1”. This result is noteworthy given relatively thin, 300 m thick, BV1 layer represents only 10%, volume, modeled Sefwi Group stratigraphy. map distance between topography produced identifies areas showing high probability host deposits Belt. Possible structural performed rocks on location discussed, we hypothesize acted as trap or source gold. Both hypotheses agree examples from literature explain observed mineralized sites.
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