Extensional detachment faulting and core-complex formation in the southern Barberton granite–greenstone terrain, South Africa: evidence for a 3.2 Ga orogenic collapse

Determining accurate temperature–time paths from U–Pb thermochronology: An example from the Kaapvaal craton, southern Africa

“…P-T estimates and 40 Ar/ 39 Ar hornblende data show that portions of the BGB were never subjected to metamorphic grades above greenschist to lower-amphibolite (Cloete, 1991;Lopez Martinez et al, 1992;Xie et al, 1997). To the south of the BGB, slivers of mafic semipelites within the plutonic complexes yield P-T estimates from upper-amphibolite to granulite grade conditions (Dziggel et al, 2002;Stevens et al, 2002;Kisters et al, 2003;Diener et al, 2005). A period of major convergent tectonism and inferred terrane accretion ca.…”

“…A period of major convergent tectonism and inferred terrane accretion ca. 3.23 Ga imposed the dominant NE-SW structural trend of the belt (Jackson et al, 1987;de Ronde and de Wit, 1994;Heubeck and Lowe, 1994;Kamo and Davis, 1994;Lowe, 1999;de Ronde and Kamo, 2000), and may be responsible for the high-grade metamorphism in the plutonic complexes at the south of the belt (Dziggel et al, 2002;Stevens et al, 2002;Kisters et al, 2003;Diener et al, 2005). Following NW-SE convergent tectonism, there was a transition towards NE-SW strike-slip to transtensional faulting through at least the central belt (Jackson et al, 1987;de Ronde and de Wit, 1994;de Ronde and Kamo, 2000).…”

“…Extensional kinematics are inferred to be either the result of a gravitational collapse immediately following ca. 3.23 Ga orogenesis (Kisters et al, 2003) or $100 Myr later contemporaneous with ca. 3.11 Ga granitic intrusions (Jackson et al, 1987;de Ronde and de Wit, 1994;Kamo and Davis, 1994;Westraat et al, Fig.…”

Subduction or sagduction? Ambiguity in constraining the origin of ultramafic–mafic bodies in the Archean crust of NW Scotland

“…These different interpretations persist to the present day and are reflected in the 'subduction 40 versus sagduction' controversy for the formation of particular fragments of Archean crust,41 such as the Barberton granite-greenstone belt (e.g., Kisters et al, 2003Kisters et al, , 2010 (discussed below); in either case, the spatial relationship suggests that the synforms are 267 synclines (Davies, 1974). 268…”

Evolution of the Earth: Plate Tectonics Through Time

“…Like the San Andreas Fault, motion is parallel to the gross strike; piercing points are not recognized in spite of detailed mapping (de Ronde and de Wit, 1994;de Ronde and Kamo, 2000). Motion is associated with detachment faulting (Huebeck and Lowe, 1994;Kisters et al, 2003).…”