Isotopic age data of single zircons from the Archaæan Sukumaland Greenstone Belt, Tanzania

Palaeoproterozoic to Neoproterozoic growth and evolution of the eastern Congo Craton: Its role in the Rodinia puzzle

“…These ages and initial isotopic ratios are very similar to those obtained for the upper parts of the Sukumaland Greenstone Belt further west, which have been dated by isotope dilution thermal ionisation mass spectrometry (ID-TIMS) on zircon at ca. 2.65 Ga (Borg and Krogh, 1999), although the lower parts of this greenstone belt appear to be significantly older at ca. 2.8 Ga based on a whole-rock Sm-Nd age on mafic volcanics (Manya and Maboko, 2003).…”

Ion microprobe zircon U–Pb dating of the late Archaean metavolcanics and associated granites of the Musoma-Mara Greenstone Belt, Northeast Tanzania: Implications for the geological evolution of the Tanzania Craton

“…Manya and Maboko (2003) reported a whole rock Sm-Nd isochron age of 2823 ± 44 Ma (MSWD = 1.24, initial e(Nd) = 2.7) for the oldest metabasalts in the SGB. Borg and Krogh (1999) reported single zircon U-Pb ages of 2780 ± 3 Ma and 2808 ± 3 for the upper Nyanzian rhyolitic pyroclastic rocks of the SGB and interpreted these ages as dating the explosive eruption of rhyolite in the area. They further reported a U-Pb zircon age of 2699 ± 9 Ma from a trachyandesite collected from the old Geita Mine near the northern margin of the Sukumaland Greenstone Belt.…”

Identification of hydrothermal paleofluid pathways, the pathfinders in the exploration of mineral deposits: A case study from the Sukumaland Greenstone Belt, Lake Victoria Gold Field, Tanzania

“…BIF in the SGB were dated through the trachyandesitic units interbedded together with BIF in Geita; the absolute age of these units is 2699 ± 9 Ma (Borg, 1994). This age represents the youngest available age limit for the greenstone sequences in the area (Borg and Krogh, 1999). Metasediments are dated between 2475 Ma and 2680 Ma, where the 2475 Ma is reported to be the youngest age for the Kavirondian metasediments in the Archaean Tanzania Craton (Borg and Krogh, 1999;Cahen et al, 1984).…”

“…The N-S and WSW-ENE-trending systems were identified to be sets of intermediate and mafic dykes intruded during different magmatic events. Examples of these dykes are the Proterozoic and Archaean dykes reported in the SGB (Borg and Krogh, 1999;Borg and Masolla, 1991). The NW-SE and SW-NE systems represent the two dominant sets of conjugate shear zones and faults.…”

“…The top most part of the stratigraphy is covered by the clastic metasedimentary rocks, regionally the Kavirondian, which rest unconformably on the older rocks. They mostly comprise conglomerates, grits, and clastic quartzites; the conglomerates are compositionally mature and contain predominantly pebbles from the underlying BIF (Borg, 1992;Borg and Krogh, 1999;Maboko, 2001). Intermediate to mafic dykes and sills have intruded the whole Archaean sequence; selective weathering of these dykes made them easily detectable in the underground exposures in Geita gold deposit (Eberle, 1988).…”