MAPEO, R. B. M., ARMSTRONG, R. A., KAMPUNZU, A. B. (2001) SHRIMP U–Pb zircon geochronology of gneisses from the Gweta borehole, northeast Botswana: implications for the Palaeoproterozoic Magondi Belt in southern Africa. Geological Magazine, 138 (3) 299-308 doi:10.1017/s001675680100526x
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | SHRIMP U–Pb zircon geochronology of gneisses from the Gweta borehole, northeast Botswana: implications for the Palaeoproterozoic Magondi Belt in southern Africa | ||
| Journal | Geological Magazine | ||
| Authors | MAPEO, R. B. M. | Author | |
| ARMSTRONG, R. A. | Author | ||
| KAMPUNZU, A. B. | Author | ||
| Year | 2001 (May) | Volume | 138 |
| Issue | 3 | ||
| Publisher | Cambridge University Press (CUP) | ||
| DOI | doi:10.1017/s001675680100526xSearch in ResearchGate | ||
| Generate Citation Formats | |||
| Mindat Ref. ID | 258661 | Long-form Identifier | mindat:1:5:258661:2 |
| GUID | 0 | ||
| Full Reference | MAPEO, R. B. M., ARMSTRONG, R. A., KAMPUNZU, A. B. (2001) SHRIMP U–Pb zircon geochronology of gneisses from the Gweta borehole, northeast Botswana: implications for the Palaeoproterozoic Magondi Belt in southern Africa. Geological Magazine, 138 (3) 299-308 doi:10.1017/s001675680100526x | ||
| Plain Text | MAPEO, R. B. M., ARMSTRONG, R. A., KAMPUNZU, A. B. (2001) SHRIMP U–Pb zircon geochronology of gneisses from the Gweta borehole, northeast Botswana: implications for the Palaeoproterozoic Magondi Belt in southern Africa. Geological Magazine, 138 (3) 299-308 doi:10.1017/s001675680100526x | ||
| In | (2001, May) Geological Magazine Vol. 138 (3) Cambridge University Press (CUP) | ||
| Abstract/Notes | This paper presents new U–Pb zircon analyses from garnet–sillimanite paragneisses from the Gweta borehole in northeast Botswana. Concordant to near-concordant analyses of zircon from these rocks reveal a billion year history from 3015 ± 21 Ma for the oldest detrital grain measured, to the age of high-grade metamorphism, 2027 ± 8 Ma. The maximum age of sedimentation in the Magondi belt is constrained by the age of the youngest concordant detrital zircon at 2125 ± 6 Ma. This contrasts with the age of sedimentation in the Central Zone of the Limpopo belt which is Archaean. The comparison of our results with U–Pb zircon data from the Magondi belt in Zimbabwe suggests that the granulite-facies metamorphism in this belt extended between c. 2027–1960 Ma. Granulite-facies rocks with U–Pb zircon ages in this interval are also known in the Ubendian belt and lend support to the correlation of these two segments of Palaeoproterozoic belts in southern and central–eastern Africa. The granulite facies metamorphism in the Magondi belt is coeval with the high-grade metamorphism and granitoids documented further south in the Central Zone of the Limpopo Belt. | ||
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