Geochemistry and Sm-Nd systematics of the 1.67 Ga Buanji Group of southwestern Tanzania: Paleo-weathering, provenance and paleo-tectonic setting implications

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dc.contributor.authorKasanzu, Charles H.
dc.contributor.authorMaboko, Makenya A. H.
dc.contributor.authorManya, Shukrani
dc.date.accessioned2021-04-12T22:29:38Z
dc.date.available2021-04-12T22:29:38Z
dc.date.issued2017-09
dc.description.abstractWe present major and trace and Nd-isotopic data of the ∼1.67 Ga Buanji Group of southwestern Tanzania in order to constrain the nature of their protolith and the intensity of chemical weathering in the source terranes and make inferences on the nature of climatic conditions during the late Paleoproterozoic in the region. Major and trace element contents of the shales from three stratigraphic formations are comparable to those of the post-Archaean Australian Shale (PAAS) and the average Proterozoic Shale (PS). They are characterized by enrichments in LREE relative to HREE ((La/Yb)CN = 9.07–13.2; (Gd/Yb)CN = 1.51–1.85) and negative Eu anomalies (Eu/Eu* = 0.61–0.81); features which are comparable to those of PAAS and PS, indicating upper continental sources. Provenance proxy ratios, together with abundances of Cr, Ni, Co and V that increase up-stratigraphy suggest a decreasing input of felsic detritus up-stratigraphy. Chemical Indices of Alteration (CIA) for the lower, middle and upper Buanji formations are 81, 76 and 79, respectively. These indices largely indicate intermediate (ca. 60–80) to extreme (>80) weathering intensities of the precursor rocks. These observations may suggest the prevalence of warm, humid climates during the late Paleoproterozoic in the region.en_US
dc.description.sponsorshipWe present major and trace and Nd-isotopic data of the ∼1.67 Ga Buanji Group of southwestern Tanzania in order to constrain the nature of their protolith and the intensity of chemical weathering in the source terranes and make inferences on the nature of climatic conditions during the late Paleoproterozoic in the region. Major and trace element contents of the shales from three stratigraphic formations are comparable to those of the post-Archaean Australian Shale (PAAS) and the average Proterozoic Shale (PS). They are characterized by enrichments in LREE relative to HREE ((La/Yb)CN = 9.07–13.2; (Gd/Yb)CN = 1.51–1.85) and negative Eu anomalies (Eu/Eu* = 0.61–0.81); features which are comparable to those of PAAS and PS, indicating upper continental sources. Provenance proxy ratios, together with abundances of Cr, Ni, Co and V that increase up-stratigraphy suggest a decreasing input of felsic detritus up-stratigraphy. Chemical Indices of Alteration (CIA) for the lower, middle and upper Buanji formations are 81, 76 and 79, respectively. These indices largely indicate intermediate (ca. 60–80) to extreme (>80) weathering intensities of the precursor rocks. These observations may suggest the prevalence of warm, humid climates during the late Paleoproterozoic in the region.en_US
dc.identifier.citationKasanzu, C. H., Maboko, M. A., & Manya, S. (2017). Geochemistry and Sm-Nd systematics of the 1.67 Ga Buanji Group of southwestern Tanzania: Paleo-weathering, provenance and paleo-tectonic setting implications. Geoscience Frontiers, 8(5), 1025-1037.en_US
dc.identifier.doihttps://doi.org/10.1016/j.gsf.2016.09.004
dc.identifier.urihttp://hdl.handle.net/20.500.11810/5588
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.subjectBuanji Groupen_US
dc.subjectShalesen_US
dc.subjectSource weathering conditionsen_US
dc.subjectProvenancen_US
dc.titleGeochemistry and Sm-Nd systematics of the 1.67 Ga Buanji Group of southwestern Tanzania: Paleo-weathering, provenance and paleo-tectonic setting implicationsen_US
dc.typeJournal Article, Peer Revieweden_US
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