Structural geology of the Rockvale Block, northern New South Wales
Titel:
Structural geology of the Rockvale Block, northern New South Wales
Auteur:
Korsch, R. J.
Verschenen in:
Australian journal of earth sciences
Paginering:
Jaargang 28 (1981) nr. 1-2 pagina's 51-70
Jaar:
1981-04
Inhoud:
Most strata are inverted in the Rockvale Block, northern N.S.W., which is completely deformed and contains at least three recognisable deformations (D1, D2, D3). A deformation, Do, has been invoked to explain the existence of inverted strata over a large region. The intensities of the mesoscopic deformations increase eastwards, the W being dominated by D1. D2 and D3 features become progressively more common eastwards and are eventually observed in regional metamorphic rocks of amphibolite facies grade. D1 produced upright folds on the previously inverted strata. Planar structures vary from an axial-surface slaty cleavage in the W to a schistosity in the E. The predominant E-W strike of S1 in the W has been rotated to a N-S orientation in the E. A macroscopic F1 fold, the Rockvale Anticlinal Synform, plunges steeply to the E with its axial surface parallel to the regional strike of the slaty cleavage. The F1 folds were produced by buckling modified by relatively homogeneous strain. F2folds vary considerably in style from gentle warps, through kink bands and tight chevron folds in the low-grade slates, to isoclinal folds in the high-grade schists. Rotation of S3 from NE-SW in the W to NNW-SSE in the E has occurred. D3 is manifest only as gentle warps observed in S2.
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