Compositional variations in manganese carbonate micronodules from the Lower Proterozoic Nsuta deposit, Ghana: Product of authigenic precipitation or post-formational diagenesis?

Simple item page
dc.contributor.authorNyame, F.K.
dc.contributor.authorBeukes, N.J.
dc.contributor.authorKase, K.
dc.contributor.authorYamamoto, M.
dc.date.accessioned2019-03-04T10:39:03Z
dc.date.available2019-03-04T10:39:03Z
dc.date.issued2003-01
dc.description.abstractDetailed petrographic and microprobe studies of micronodules identified in the manganese carbonate orebody and adjacent Mn-rich rocks at the ∼ 2.2 Ga Nsuta deposit, Ghana, indicate distinct lithologic control on nodule structure and chemical composition. Nodules in the Mn-rich rocks adjacent to the manganese carbonate orebody conform with the well-banded nature of the rock and are distinctly zoned into alternating bands compositionally dominated by Mg kutnahorite and Mg-Ca rhodochrosite. Individual nodules are partially or completely cemented by thin dark silica and carbonates of Ca-Mg±Mn solid solution. Nodules in the orebody, on the contrary, are generally massive, homogeneous, consist predominantly of rhodochrosite and are only partially cemented by dark silica. Based on the stratigraphic relationship of the nodule-bearing rocks to the manganese carbonate orebody and the variations in texture and composition observed in the nodules, it would appear that the Mn carbonate nodules precipitated diagenetically in response to changing pore water chemistry and/or metal (Mn and Ca) supply. The overall mineralogical and geochemical features indicate, in addition, that the nodules may have preserved original carbonate compositions, both metastable and stable, during burial diagenesis and low-grade regional metamorphism. © 2002 Elsevier Science B.V. All rights reserved.en_US
dc.identifier.otherhttps://doi.org/10.1016/S0037-0738(02)00128-8
dc.identifier.otherVolume 154, Issues 3–4,Pages 159-175
dc.identifier.urihttp://ugspace.ug.edu.gh/handle/123456789/28515
dc.language.isoenen_US
dc.publisherSedimentary Geologyen_US
dc.subjectDiagenesisen_US
dc.subjectKutnahoriteen_US
dc.subjectMicronodulesen_US
dc.subjectProterozoicen_US
dc.subjectRhodochrositeen_US
dc.titleCompositional variations in manganese carbonate micronodules from the Lower Proterozoic Nsuta deposit, Ghana: Product of authigenic precipitation or post-formational diagenesis?en_US
dc.typeArticleen_US

Files

License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.6 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Department of Earth Science