Petrology of the Talc-Kyanite-Yoderite-Quartz Schist and Associated Rocks of Mautia Hill, Mpwapwa District, Tanzania

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dc.creatorMruma, Abdulkarim H.
dc.creatorBasu, N. K.
dc.date2016-09-21T13:30:49Z
dc.date2016-09-21T13:30:49Z
dc.date1987
dc.date.accessioned2018-03-27T08:57:44Z
dc.date.available2018-03-27T08:57:44Z
dc.descriptionFull text can be accessed at http://www.sciencedirect.com/science/article/pii/089953628790073X
dc.descriptionTalc-kyanite-yoderite-quartz schist and associated rocks belonging to the Proterozoic Usagaran System occurring along the western edge of the Mozambique Orogenic Belt (450–600 Ma) were studied using petrographic, X-ray diffraction, electron-microprobe and fluid inclusion methods. The main rock types studied in the area include talc-kyanite-yoderite-quartz schist, piemontite quartzite, epidote-phogopite quartzite, kyanite-quartz-biotite schist and biotite gneiss. Fluid inclusion studies on the selected rock types indicate the presence of usually two-phased H2O-rich and CO2-rich fluids with a range of filling from 0.6 to 0.95. Some CO2-rich fluids may be one-phased (liquid) at room temperature with their degree of filling ranging from 0.4 to 1.0. Most of the CO2-rich inclusions show negative crystal shapes. Fluid inclusions trapped in kyanite in the talc-kyanite-yoderite-quartz schist with isolated negative crystal shapes are considered primary. The presence of CO2-rich fluids indicates low water fugacity during the formation of the talc-kyanite assemblage, and so pressure was probably lower. Primary fluid inclusions could be trapped at pressures between 5.2 and 5.6 kb and temperatures ranging from 540 to 570°C; this gives the possible P-T range of the peak of the first phase of progressive metamorphism.
dc.identifierMruma, A.H. and Basu, N.K., 1987. Petrology of the talc-kyanite-yoderite-quartz schist and associated rocks of Mautia Hill, Mpwapwa District, Tanzania. Journal of African Earth Sciences (1983), 6(3), pp.301-311.
dc.identifierhttp://hdl.handle.net/20.500.11810/3955
dc.identifier10.1016/0899-5362(87)90073-X
dc.identifier.urihttp://hdl.handle.net/20.500.11810/3955
dc.languageen
dc.publisherElsevier
dc.titlePetrology of the Talc-Kyanite-Yoderite-Quartz Schist and Associated Rocks of Mautia Hill, Mpwapwa District, Tanzania
dc.typeJournal Article, Peer Reviewed

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