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, Shukrani; Kobayashi, Katsura; Maboko, Makenya A.H.; Nakamura, Eizo

doi:10.1016/j.jafrearsci.2006.03.004

Cited by 58 publications

(21 citation statements)

References 17 publications

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“…The Tanzania craton is an amalgamation of several Archean greenstone belts, which were intruded by granites and migmatized during multistage tectono-metamorphic events [Manya and Maboko, 2003;Manya et al, 2006;Dawson, 2008;Manya and Maboko, 2008; Thomas et al, 2013;Sanislav et al, 2014]. The craton is surrounded by several Proterozoic belts [M€ oller et al, 1995;Hanson, 2003;Tenczer et al, 2007].…”

Section: Geologic Setting and Samplesmentioning

confidence: 99%

Plume‐cratonic lithosphere interaction recorded by water and other trace elements in peridotite xenoliths from the Labait volcano, Tanzania

Huang

Peslier

Rudnick

et al. 2015

Geochem Geophys Geosyst

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Water and other trace element concentrations in olivine (1-39 ppm H 2 O), orthopyroxene (10-150 ppm H 2 O), and clinopyroxene (16-340 ppm H 2 O) of mantle xenoliths from the Labait volcano, located on the edge of the Tanzanian craton along the eastern branch of the East African Rift, record melting and subsequent refertilization by plume magmas in a stratified lithosphere. These water contents are at the lower end of the range observed in other cratonic mantle lithospheres. Despite correlations between water content and indices of melting in orthopyroxene from the shallow peridotites, and in both olivine and orthopyroxene from the deep peridotites, water concentrations are too high for the peridotites to be simple residues. Instead, the Labait water contents are best explained as reflecting interaction between residual peridotite with a melt having relatively low water content (<1 wt.% H 2 O). Plume-derived melts are the likely source of water and other trace element enrichments in the Labait peridotites. Only garnet may have undergone addition of water from the host magma as evidenced by water content increasing toward the kelyphite rim in one otherwise homogeneous garnet. Based on modeling of the diffusion profile, magma ascent occurred at 4-28 m/s. In summary, plume-craton interaction appears to result in only moderate water enrichment of the lithosphere.

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Section: Geologic Setting and Samplesmentioning

confidence: 99%

Plume‐cratonic lithosphere interaction recorded by water and other trace elements in peridotite xenoliths from the Labait volcano, Tanzania

Huang

Peslier

Rudnick

et al. 2015

Geochem Geophys Geosyst

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“…Borg andShackleton 1997, Manya et al, 2006). The geology of the northern MMGB has been described by Stockley (1936), Gray and Macdonald (1964) and recently by Manya et al (2006), Manya et al (2007a, b). Gray and Macdonald (1964) subdivided the supracrustal rocks of northern MMGB into four units (from bottom upwards): the mafic volcanic rocks, lower felsic volcanic rocks (the object of this study), the upper felsic volcanic rocks of the Nyanzian Supergroup and the metasedimentary rocks of the Kavirondian Supergroup.…”

Section: Geological Backgroundmentioning

confidence: 90%

“…Gray and Macdonald (1964) subdivided the supracrustal rocks of northern MMGB into four units (from bottom upwards): the mafic volcanic rocks, lower felsic volcanic rocks (the object of this study), the upper felsic volcanic rocks of the Nyanzian Supergroup and the metasedimentary rocks of the Kavirondian Supergroup. Manya et al (2006) reported ion microprobe U-Pb zircon ages for the MMGB rocks and showed that the mafic volcanic rocks are high-Mg andesites that are dated at between 2676 ± 12 and 2669 ± 9 Ma whereas the upper felsic volcanic rocks are dated at 2668 ± 30 Ma together with the Na-rich granitoids that yielded an age of 2668 ± 11 Ma. The Kavirondian volcanic rocks yielded a zircon U-Pb age of 2667 ± 8 Ma (Manya et a l .…”

Section: Geological Backgroundmentioning

confidence: 99%

“…2006). The MMGB magmatism was concluded at 2649 ± 36 Ma by the intrusion of post-orogenic K-rich granites (Manya et al 2006). …”

Section: Geological Backgroundmentioning

confidence: 99%

“…Previous documented and published geological works are limited to geological mapping done in the 1960's by Gray and Macdonald (1964) for the northern MMGB, and Mulgrew (1964) for the southern MMGB. Because of the economic potential of the MMGB, the area has recently attracted many geochemical studies including those of Manya et al (2006), Manya et al (2007a, b), Kazimoto (2007) and Mtoro (2007). These works have largely contributed to our modern understanding of the geological evolution of the MMGB and factors that control gold mineralization through geochemical and geochronological studies.…”

Section: Introductionmentioning

confidence: 99%

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Geochemistry and Nd - isotopic composition of high silica rhyolites in the neoarchaean Musoma-Mara greenstone belt, northern Tanzania: evidence for the presence of older continental crust

Manya

2009

Tanz. J. Sci.

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From source to sink in central Gondwana: Exhumation of the Precambrian basement rocks of Tanzania and sediment accumulation in the adjacent Congo basin

et al. 2016

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Apatite fission track (AFT) and (U‐Th)/He (AHe) thermochronometry data are reported and used to unravel the exhumation history of crystalline basement rocks from the elevated (>1000 m above sea level) but low‐relief Tanzanian Craton. Coeval episodes of sedimentation documented within adjacent Paleozoic to Mesozoic basins of southern Tanzania and the Congo basin of the Democratic Republic of Congo indicate that most of the cooling in the basement rocks in Tanzania was linked to erosion. Basement samples were from an exploration borehole located within the craton and up to 2200 m below surface. Surface samples were also analyzed. AFT dates range between 317 ± 33 Ma and 188 ± 44 Ma. Alpha (Ft)‐corrected AHe dates are between 433 ± 24 Ma and 154 ± 20 Ma. Modeling of the data reveals two important periods of cooling within the craton: one during the Carboniferous‐Triassic (340–220 Ma) and a later, less well constrained episode, during the late Cretaceous. The later exhumation is well detected proximal to the East African Rift (70 Ma). Thermal histories combined with the estimated geothermal gradient of 9°C/km constrained by the AFT and AHe data from the craton and a mean surface temperature of 20°C indicate removal of up to 9 ± 2 km of overburden since the end of Paleozoic. The correlation of erosion of the craton and sedimentation and subsidence within the Congo basin in the Paleozoic may indicate regional flexural geodynamics of the lithosphere due to lithosphere buckling induced by far‐field compressional tectonic processes and thereafter through deep mantle upwelling and epeirogeny tectonic processes.

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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

Cited by 58 publications

References 17 publications

Plume‐cratonic lithosphere interaction recorded by water and other trace elements in peridotite xenoliths from the Labait volcano, Tanzania

Plume‐cratonic lithosphere interaction recorded by water and other trace elements in peridotite xenoliths from the Labait volcano, Tanzania

Geochemistry and Nd - isotopic composition of high silica rhyolites in the neoarchaean Musoma-Mara greenstone belt, northern Tanzania: evidence for the presence of older continental crust

From source to sink in central Gondwana: Exhumation of the Precambrian basement rocks of Tanzania and sediment accumulation in the adjacent Congo basin

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