Structure and interpretation of the Alpine schists in Copland and Cook River Valleys, South Island, New Zealand
作者:
R.H. Findlay,
期刊:
New Zealand Journal of Geology and Geophysics
(Taylor Available online 1987)
卷期:
Volume 30,
issue 2
页码: 117-138
ISSN:0028-8306
年代: 1987
DOI:10.1080/00288306.1987.10422178
出版商: Taylor & Francis Group
关键词: Alpine schist;mid Tertiary/Miocene;ductile shear;folds;transposition;dextral transpression;Indian plate;Pacific plate;plate boundaries
数据来源: Taylor
摘要:
Copland and Cook River Valleys provide a cross-section through the 25 km wide, pum-pellyite-actinolite to amphibolite facies Alpine schists along the Indian/Pacific plates boundary in South Island, New Zealand. Five phases of deformation are reported: D1, possible soft-sediment folding; D2, syn-first metamorphic isoclinal folds; D3, syn-second metamorphic regional folds; D., local upright folds; D5, faulting. The D3structures include vertically and laterally anastomosing late D3 domains of intense transposition (Paringa domains). The D3 structures formed during mid Tertiary to Late Miocene times in response to broadly. distributed dextral transpressive strain along the Indian/Pacific plates' boundary. This strain was localised later to the Alpine Fault. The D3 structural style changes south of Moeraki Valley, and reflects the change in dip of the plate boundary, from steeply east-dipping in the study area, to shallowly east-dipping south of Moeraki Valley.
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