Geology of a Welded Diapir and Flanking Mini-Basins in the Flinders Ranges of South Australia

Foldbelts with early salt withdrawal and diapirism: Physical model and examples from the northern Gulf of Mexico and the Flinders Ranges, Australia

“…Most diapirs are flanked by Sturtian (Fig. 15) or younger sediments, which typically display evidence of syndepositional diapir rise (e.g., Coats, 1964Coats, , 1965Dalgarno and Johnson, 1968;Preiss, 1985;Lemon, 1985;Dyson, 1998Dyson, , 1999Dyson and Rowan, 2004). However, similar features are found locally in the Torrensian Burra Group (Fig.…”

“…Moreover, the areas immediately flanking many of the diapirs are characterized by variably folded strata, local unconformities, slumps containing diapiric detritus, and allochthonous tongues (Coats, 1964(Coats, , 1965Dalgarno and Johnson, 1968;Lemon, 1985;Dyson, 1996Dyson, , 1998Dyson, , 1999Dyson, , 2004Dyson and Rowan, 2004). These are features diagnostic of diapirs rising near the sea floor or ground surface, with topographic expression, that are periodically exposed and eroded (Giles and Lawton, 2002;Rowan et al, 2003b).…”

“…Salt mobilization and the formation of minibasins are evident in local variations in thickness and facies of much of the Adelaidean sequence in the Flinders Ranges (e.g., Dalgarno and Johnson, 1968;Preiss, 1987b;Forbes, 1989;Dyson, 1996Dyson, , 1998Dyson, , 1999Dyson, , 2004Dyson and Rowan, 2004). Moreover, the areas immediately flanking many of the diapirs are characterized by variably folded strata, local unconformities, slumps containing diapiric detritus, and allochthonous tongues (Coats, 1964(Coats, , 1965Dalgarno and Johnson, 1968;Lemon, 1985;Dyson, 1996Dyson, , 1998Dyson, , 1999Dyson, , 2004Dyson and Rowan, 2004).…”

Basin geometry and salt diapirs in the Flinders Ranges, South Australia: Insights gained from geologically-constrained modelling of potential field data

“…Regional extension may have triggered the vertical migration of the evaporite, by stretching and fracturing the overburden. The disruption of the Callanna Group (Cooper, 1991;Preiss, 1999;Dyson and Rowan, 2004) and deposition of conglomerates in the Tapley Hill Formation and Etina Formation of the Umberatana Group may reflect salt withdrawal in salt minibasins. Salt withdrawal occurred in pulses in the Central Flinders.…”

Ediacaran stratigraphy and the biota of the Adelaide Geosyncline, South Australia

“…In the N and S Flinders Ranges, canyons incised 1-1.2 km through the basal Wonoka Formation and underlying formations suggesting submarine cut and fill (von der Borch et al, 1982), a fluvial cut followed by marine fill (von der Borch et al, 1985(von der Borch et al, , 1989), a Messinianstyle evaporitic drawdown of local sea level (Christie-Blick et al, 1990), and a mantle-plume uplift (Williams and Gostin, 2000). Giddings et al (2010) suggest submarine cut and fill due to salt withdrawal tectonics (Dyson 1998(Dyson , 1999(Dyson , 2003Dyson and Rowan, 2004). The stable isotope geochemistry of the Wonoka Formation features the "Wonoka-Shuram" anomaly with values of δ 13 C as low as -12 (Pell et al, 1993).…”