Browsing by Author "Kabohola, Joyna"

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    Sedimentology and compositional characteristics of siliciclastic and associated sediments in Ruvu basin: implication on paleo-depositional environment, provenance, and tectonic setting
    (Informa UK Limited, 2021) Godfray, Godson; Kabohola, Joyna; Msabi, Michael
    The paleo-depositional environment of theRuvu basin ranges from alluvial,floodplain, low- and high-energy fluvial channels, and deltaic sub-environments of Ngerengere beds, Tanga beds, and Jurassic Msata formations. Amboni limestones that overlap the Karoo sequences, Bagamoyo Formation and Sakura Formation were probably deposited in a shallow marineenvironment. Trace elements show that the sediments were deposited in oxic environments with a V/Cr ratio of 0.85 and Ni/Co ratio of 2.9 to anoxic environments with a V/Cr ratio >4.3.Low Cr, Ni, Co, and V, high Y/Ni and Zr/Crratios of up to 0.83 and 3.6, respectively, and low Ti/Zr ratios ranging from 0.004 to 0.01 indicate a contribution from afelsic source, and few ratios >1show some contribution from a mafic source. This is supported by the diverse enrichment inlight rare earth elements (LREEs), small negative Eu anomaliesand modest heavy REEs reflecting a dominantly granitic source. Theprovenance is probably from the Usagaran mobile belt and Proterozoic Mozambiquemobile belt. The cross-plot between Th and Ta from midJurassic to Cretaceoussediments indicates that the basin was essentially developed as a passivecontinental margin; however, discriminant factor plots of the Karoo indicatethe existence of a rift setting.