Discovery of thrust klippen, northwest of Mary Kathleen, Mt Isa Inlier, Australia
作者:
Ramon Loosveld,
Guido Schreurs,
期刊:
Australian Journal of Earth Sciences
(Taylor Available online 1987)
卷期:
Volume 34,
issue 3
页码: 387-402
ISSN:0812-0099
年代: 1987
DOI:10.1080/08120098708729419
出版商: Taylor & Francis Group
关键词: Mt Isa;Proterozoic mobile belts;Queensland;structural geology;thrusting
数据来源: Taylor
摘要:
In the northeastern part of the Mary Kathleen 1:100 000 sheet, a thick pile of Early to Middle Proterozoic metasediments, metavolcanics and intrusive rocks were deformed by an early thrusting event and later by east‐west shortening. D1produced a thrust complex, containing imbricate stacks of thrust sheets and a sequence of foliations, changing in orientation and style: S1Ais a phyllonitic fabric on the major thrusts; Sib is the axial‐plane foliation to west‐verging folds in the immediate vicinity of the major thrusts; and S1Cis the axial‐plane foliation of northeast‐southwest upright folds, locally developed within the thrust sheets, caused by shortening parallel to the transport direction. Two thrust systems have been studied in detail. In the first, in the Deighton area, the geometry of the imbricates, the extension lineations on S1Aand the orientation of D1Cfolds all point towards a westward or northwestward movement direction. In contrast, the West Leichhardt imbricates may have moved southward. After thrusting, both systems underwent east‐west shortening during D2, causing the alignment of elongate doubly plunging klippen, separated from each other by underlying steepened imbricate stacks. These results require a revision of the significance of the current lithostratigraphic column: the possibility that a major tectonic repetition rather than a sedimentary repetition occurs in the cover sequences cannot be excluded at present.
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