TY - JOUR
T1 - Geochemistry and ion microprobe (SHRIMP) age of a quartz porphyry sill in the Mozaan Group of the Pongola Supergroup
T2 - Implications for the Pongola and Witwatersrand Supergroups
AU - Gutzmer, J.
AU - Nhleko, N.
AU - Beukes, N. J.
AU - Pickard, A.
AU - Barley, M. E.
PY - 1999/6
Y1 - 1999/6
N2 - The Mozaan Group of the Pongola Supergroup is one of the oldest known cratonic supracrustal successions in the world. In the Mooihoek area, south central Swaziland, the Mozan Group is preserved in an open syncline with axial traces trending north-northwest. A pretectonic quartz porphyry sill, folded with the sedimentary strata, gives a SHRIMP U-Pb zircon age of 2837 ± 5 Ma, providing a minimum age limit for the deposition of the Mozaan Group. In contrast, the Mooihoek granitic pluton, which cross-cuts the folding, has a known single-zircon evaporation 207Pb/206Pb age of 2824 ± 6 Ma, suggesting that the deformation of the Mozaan strata took place sometime between ~2824 Ma and ~2837 Ma. Correlation between the Mozaan and Witwatersrand Supergroups suggests that most of the latter succession was also deposited prior to 2837 ± 5 Ma.
AB - The Mozaan Group of the Pongola Supergroup is one of the oldest known cratonic supracrustal successions in the world. In the Mooihoek area, south central Swaziland, the Mozan Group is preserved in an open syncline with axial traces trending north-northwest. A pretectonic quartz porphyry sill, folded with the sedimentary strata, gives a SHRIMP U-Pb zircon age of 2837 ± 5 Ma, providing a minimum age limit for the deposition of the Mozaan Group. In contrast, the Mooihoek granitic pluton, which cross-cuts the folding, has a known single-zircon evaporation 207Pb/206Pb age of 2824 ± 6 Ma, suggesting that the deformation of the Mozaan strata took place sometime between ~2824 Ma and ~2837 Ma. Correlation between the Mozaan and Witwatersrand Supergroups suggests that most of the latter succession was also deposited prior to 2837 ± 5 Ma.
UR - http://www.scopus.com/inward/record.url?scp=0033452715&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0033452715
SN - 1012-0750
VL - 102
SP - 139
EP - 146
JO - South African Journal of Geology
JF - South African Journal of Geology
IS - 2
ER -