A Reappraisal of Some Aspects of Precambrian Shield Geology

Stratigraphy and structure of the Torlesse Supergroup (Triassic-Jurassic) in the foothills of the southern Alps near Hawarden (S60–61), Canterbury

“…The vertical model envisages strong vertical movement with tectonic slides separating zones that ascended at different speeds. Similar patterns of steeply inclined, steeply plunging folds occur in diapiric bodies (Kupfer 1968), and in some Precambrian terrains (Anhaeusser et al 1969). Flattening or strong vertical extension is common in these situations, but neither is developed within the area.…”

“…The synclinal nature of the early hinges is not exceptional and has been recorded in both recumbent nappe-type terrains (Bailey 1934, p. 467;Bishop 1968b, p. 606) and in areas of steeply inclined structures (Anhaeusser et al 1969(Anhaeusser et al , p. 2187. The indication of modest induration during the early deformation is consistent with recumbent structures at a high level in the orogenic belt, perhaps formed by gravity tectonics.…”

A catalytic delamination-driven model for coupled genesis of Archaean crust and sub-continental lithospheric mantle

“…Archaean crust is dominated by granite-greenstone terranes organized into dome-and-keel structures that do not resemble the linear orogenic belts that typify Proterozoic and Phanerozoic orogens (Anhaeusser et al, 1969;Goodwin, 1981Goodwin, , 1996Windley, 1984;Krö ner, 1985;Ayres and Thurston, 1985;Bickle et al, 1995;Choukroune et al, 1995;Hamilton, 1998;Bleeker, 2002). Proposed genetic models for granite-greenstone terranes run the gamut from early vertical tectonic scenarios involving ensialic processes (e.g., Macgregor, 1951;Baragar and McGlynn, 1976;Goodwin, 1981); to uniformitarian plate-tectonic models involving arcs (Glikson, 1972;Tarney et al, 1976;Dimroth et al, 1982;Windley, 1984); to a presently popular model involving marginal oceanic terrane accretion and mixed arc-plume magmatism (e.g., Drury et al, 1984;Davis et al, 1988;Card, 1990;Williams, 1990;Desrochers et al, 1993;Kimura et al, 1993;de Wit, 1998;Kusky, 1998;Kusky and Polat, 1999;Lowe, 1999;Daigneault et al, 2002;Chown et al, 2002;Dirks et al, 2002;Percival et al, 2004).…”

Thermal and mechanical controls on the evolution of archean crustal deformation: Examples from Western Australia

“…In most cases, episodic but voluminous felsic magmatism (in the form of granite plutonism in dome cores and coeval, thick volcanic intercalations within overlying supracrustal successions) played an active role in the formation and amplification (or inflation) of dome-andkeel structure over an extended period (>500 My). Examples include the Zimbabwe Craton [e.g., Macgregor, 1951;Anhaeusser et al, 1969;Jelsma et al, 1993], the eastern Pilbara Craton (Figure 1b) of Western Australia [e.g., Hickman, 1983Hickman, , 1984Van Kranendonk et al, 2002], and the western Dharwar Craton of southern India [e.g., Choukroune et al, 1995Choukroune et al, , 1997Chardon et al, 1996Chardon et al, , 2002.…”