Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/151058
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- Title
- Recognition of the Kaweka Terrane in northern South Island, New Zealand : preliminary evidence from Rb-Sr metamorphic and U-Pb detrital zircon ages
- Related
- New Zealand journal of geology and geophysics, Vol. 54, No. 3, (2011), p.291-309
- DOI
- 10.1080/00288306.2011.569728
- Publisher
- Taylor & Francis
- Date
- 2011
- Author/Creator
- Adams, C. J
- Author/Creator
- Mortimer, N
- Author/Creator
- Campbell, H. J
- Author/Creator
- Griffin, W. L
- Description
- Detrital zircon U-Pb ages and Rb-Sr metamorphic ages from low-grade Torlesse Supergroup metasedimentary rocks from North Canterbury and Marlborough provide preliminary evidence for a continuation of the Kaweka Terrane of the central North Island into the Torlesse Composite Terrane of the South Island. This would extend from the south side of the Wairau Fault in the upper Wairau River valley southwards to the Lake Tennyson and Lake Sumner areas, and as far as Hawarden. Rb-Sr ages indicate Jurassic metamorphism, 170 ± 24Ma, with initial ⁸⁷Sr/⁸⁶Sr ratios at that time 0.7073 ± 0.0007 i.e. similar to their North Island counterparts. These Kaweka Terrane rocks have detrital zircon ages that follow the distinctive pattern of the Torlesse rocks in general, i.e. substantial (> 30%) Permian-Triassic and Precambrian-Early Palaeozoic groupings, but they also have minor youngest age components c. 175-165 Ma which constrain a maximum Early-Middle Jurassic depositional age. In detail, significant, older zircon components are Late Permian-Early Triassic (260-240 Ma) and Late Triassic (220-210 Ma), but the Precambrian-Early Palaeozoic detrital zircon ages are more scattered. The Kaweka Terrane thus forms a linear belt (c. 500 km) along the length of the Torlesse Composite Terrane in both North and South Islands. In the South Island it coincides with the Esk Head Belt, i.e. east of the Rakaia Terrane (Triassic-La te Permian) and west of the Pahau Terrane (Early Cretaceous-Late Jurassic).
- Description
- 19 page(s)
- Subject Keyword
- Detrital zircon ages
- Subject Keyword
- Kaweka Terrane
- Subject Keyword
- Rb-Sr dating
- Subject Keyword
- Sr isotopes
- Subject Keyword
- Torlesse Composite Terrane
- Subject Keyword
- Torlesse Supergroup
- Subject Keyword
- U-Pb dating
- Resource Type
- journal article
- Organisation
- Macquarie University. National Key Centre for Geochemical Evolution and Metallogeny of Continents (GEMOC)
- Identifier
- http://hdl.handle.net/1959.14/151058
- Identifier
- ISSN:0028-8306
- Identifier
- mq_res-ext-2-s2.0-80053234276
- Language
- eng
- Reviewed
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