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Structural geology of the Rockvale Block, northern New South Wales

 

作者: R. J. Korsch,  

 

期刊: Journal of the Geological Society of Australia  (Taylor Available online 1981)
卷期: Volume 28, issue 1-2  

页码: 51-70

 

ISSN:0016-7614

 

年代: 1981

 

DOI:10.1080/00167618108729143

 

出版商: Taylor & Francis Group

 

数据来源: Taylor

 

摘要:

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. D2and D3features become progressively more common eastwards and are eventually observed in regional metamorphic rocks of amphibolite facies grade. D1produced 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 S1in the W has been rotated to a N‐S orientation in the E. A macroscopic F1fold, the Rockvale Anticlinal Synform, plunges steeply to the E with its axial surface parallel to the regional strike of the slaty cleavage. The F1folds 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 S3from NE‐SW in the W to NNW‐SSE in the E has occurred. D3is manifest only as gentle warps observed in S2.

 

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