Tectonic and stratigraphic evolution of the Kalosi PSC area and associated development of a Tertiary petroleum system, South Sulawesi, Indonesia

Paleostress reconstruction from calcite twin and fault–slip data using the multiple inverse method in the East Walanae fault zone: Implications for the Neogene contraction in South Sulawesi, Indonesia

“…These stress states are consistent with a contractional or thrust tectonic regime with NEe SW to EeW-directed shortening. Evidence of such a contractional event in the Western Sulawesi area, which is attributed to the collision of East Sulawesi with the BanggaieSula and Butone Tukangbesi blocks, includes thrusting in the northern part of Sulawesi Island (Coffield et al, 1993;Bergman et al, 1996), and folding and uplifting in some parts of Bone Basin (Yulihanto, 2004) , 2010). This collision event could have affected the South Sulawesi and activated the EWF.…”

“…Based on the results of previous studies on the regional tectonics of Sulawesi (e.g., Hamilton, 1979;Yuwono et al, 1988;Coffield et al, 1993;Priadi et al, 1994;Bergman et al, 1996;Polvé et al, 1997;Macpherson and Hall, 1999;Hall, 2002Hall, , 2011Hall, 2003, 2007;Van Leeuwen and Muhardjo, 2005;Bellier et al, 2006;Van Leeuwen et al, 2010), the history of tectonics in Western Sulawesi including the South Sulawesi area during the NeogeneeQuaternary was as intra-plate extension followed by contraction during continentemicrocontinents collision. Stress states during this tectonic sequence are expected to be recorded in mesoscale faults and calcite twins that pervasively developed in the strata along the EWF.…”

“…Therefore, the EWF is thought to have played a major role in the structural and landform developments in this region during the Neogene. The predominance of a sinistral strikeeslip motion in the EWF has been assumed on the basis of its linear topographic feature and the shear sense of its neighboring major faults, including the Masupu fault in the northern area (Hamilton, 1979;Coffield et al, 1993;Guritno et al, 1996;Van Leeuwen et al, 2010). However, the timing and sense of fault motion plus associated deformation have not been sufficiently investigated (Hall and Wilson, 2000;Van Leeuwen et al, 2010).…”

“…1a). The Neogene tectonic history of Sulawesi is characterized by a continentecontinent collision that occurred between Sundaland (Western arc) and Australian Craton-derived blocks (Eastern arc) (Hamilton, 1979;Yuwono et al, 1988;Coffield et al, 1993;Priadi et al, 1994;Bergman et al, 1996;Polvé et al, 1997;Elburg and Foden, 1999;Hall and Wilson, 2000;Hall, 2002;Elburg et al, 2003), resulting in the development of large-scale strikeeslip faults, fold and thrust belts, and magmatism related to extensive lithospheric melting (Bergman et al, 1996). A number of NeS-to-NWeSE-trending large-scale faults occur in Sulawesi Island, including the Palu-Koro fault in Central Sulawesi and the Matano fault in the eastern arm of the island.…”

Stratigraphy and tectonic setting of the Cretaceous and Paleogene volcanic-sedimentary successions in northwest Sulawesi, Indonesia: implications for the Cenozoic evolution of Western and Northern Sulawesi

“…The widely scattered occurrences of Early-Middle Miocene shallow marine limestone (Section 3) suggest a relative drop in sea level. In the south arm, stable carbonate platform sedimentation persisted throughout the Oligocene and continued into the early Middle Miocene, with marls, reworked carbonates and shales being deposited in adjacent basins (Tonassa and Makale Formations; Coffield et al, 1993;Wilson and Bosence, 1996).…”