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- W2015093484 abstract "Crustal architecture can be recognised from Seismic fabric characteristics and velocity information. Across Phanerozoic eastern Australia, three major crustal sub-divisions are identified from data in southern Queensland. They occur under (west to east) the Nebine Ridge, Taroom Trough and New England Fold Belt, with each crustal sub-division having its own internal architecture but separated by major bounding structures (geosutures). These features are assessed against evolutionary models for the region. The significant conclusions are as follows: (1)The Nebine Ridge forms the southeastern part of the Thomson Fold Belt but has a crustal architecture distinctly different from that under the central part of the fold belt, tentatively supporting an evolutionary model involving fragmentation and eastward stretching and thinning of a Precambrian Australian craton. The ridge crust has possibly been considerably altered by Carboniferous plutonism and compressional events. (2)Between the Nebine Ridge and the crust under the Taroom Trough of the Bowen Basin there is a major low-angle (5–10°) geosuture (the Foyleview geosuture), which extends from upper to lower crustal levels along a series of prominent horizons. It was probably active during the major Carboniferous tectonism which severely structured Devonian basins west of the Nebine Ridge. The geosuture forms the southeastern boundary of the Thomson Fold Belt. (3)The crustal architecture under the Taroom Trough has little obvious structure above an outstanding Moho transition zone. However, the prominent Meandarra Gravity Ridge striking along the trough axis highlights the possibility of high-density mafic volcanics within the crust and the probability of a rift model being appropriate early in the trough's history. The sedimentary basin architecture supports the concept of an early extensional history for the crust within a poorly defined, N-S trending, strike-slip regime. (4)Between the Taroom Trough and the New England Fold Belt we interpret a high-angle geosuture extending through the crust (the Burunga-Mooki geosuture). Reactivation during late Palaeozoic-early Mesozoic times produced a series of reverse faults along the uplifted eastern margin of the trough. Some of these structures are tentatively considered to be positive flower structures above deeper faults with strike-slip movement. The geosuture separates regions with distinctly different Seismic fabrics and played an important role in the formation of the Bowen-Gunne-dah-Sydney Basin system. (5)Within the New England Fold Belt, crustal domains can be recognized associated with late Palaeozoic oroclinal bending and early Mesozoic trans-tensional basins. Major oroclinal bending of the upper crust in the west of the fold belt is interpreted above a mid-crustal detachment (the Texas detachment). In the central part of the fold belt, the Seismic data support a trans-tensional mechanism for the formation of Triassic basins with steeply dipping bounding faults. Under the east of the fold belt, an imbricate thrust stack/accretionary wedge is clearly imaged above a mid-crustal horizon (the Brisbane mid-crustal detachment). Upper crustal deformation appears to have occurred above this detachment. (6)From the Nebine Ridge to the coast, the Moho is clearly defined below a 3-km thick Moho transition zone. Hast of the Thomson Fold Belt, the Moho level is identified as a gently undulating feature at 36–38 km depth and probably re-established after the major late Palaeozoic tectonic events which formed the crust under the Taroom Trough and New England Fold Belt. This contrasts with the middle Palaeozoic lower crustal/Moho features which appear to be preserved under the Thomson Fold Belt. (7)The thickest crust under the Nebine Ridge (about 44 km) appears to be associated with lower crustal wedging from the east. There is an apparent thinning of the non-sedimentary crust under the deepest basin (Taroom Trough) of about 30% compared with the crust to the west and east. No crustal thickening is evident in the region of oroclinal bending within the New England Fold Belt." @default.
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- W2015093484 date "1990-02-01" @default.
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- W2015093484 title "Seismic imaging of major tectonic features in the crust of Phanerozoic eastern Australia" @default.
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- W2015093484 doi "https://doi.org/10.1016/0040-1951(90)90219-x" @default.
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