Contact Metamorphism in the Supracrustal Rocks of the Sukumaland Greenstone Belt in the North West Tanzania

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dc.contributor.authorBoniface, Nelson
dc.date.accessioned2016-04-22T10:19:57Z
dc.date.available2016-04-22T10:19:57Z
dc.date.issued2011
dc.description.abstractBiotite-granite intrusions in meta-ironstones at Geita Hills and the Bukoli alkali-granite intrusion in metabasites at Mawemeru area produced heat that baked the respective country rocks through epidote-amphibolite- to amphibolite-facies. Critical and informative mineral assemblages in the metairostones of Geita Hills are garnet-grunerite-epidote-quartz and garnetferrogedrite- biotite-quartz and in the metabasites of Mawemeru is ferrotschermakite-(Naplagioclase)- quartz. Peak temperatures ranging between 438°C and 544°C were calculated from the above mineral assemblages and a pressure not exceeding 3 kbar was inferred to from the composition of magnesium-iron amphiboles (grunerite with XFe ratio of 0.83, i.e. Gru83). Hornfels textures in the metaironstones are suggested by euhedral poikiloblastic garnet and quartz with grain boundaries intersecting at approximately 120° (granoblastic polygonal texture) and biotite aggregates forming an interlocking network of elongate grains aligned in all directions and bounded by rational crystal faces (decussate texture).en_US
dc.identifier.citationBoniface, N., 2011. Contact metamorphism in the supracrustal rocks of the Sukumaland Greenstone Belt in the North West Tanzania. Tanzania Journal of Science, 37(1).en_US
dc.identifier.issn0856 1761
dc.identifier.urihttp://hdl.handle.net/123456789/1617
dc.language.isoenen_US
dc.subjectContact metamorphismen_US
dc.subjectintrusionsen_US
dc.subjectSukumaland Greenstonebelten_US
dc.subjectNeoarchaeanen_US
dc.titleContact Metamorphism in the Supracrustal Rocks of the Sukumaland Greenstone Belt in the North West Tanzaniaen_US
dc.typeJournal Article, Peer Revieweden_US
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