New Zealand Journal of Geology and Geophysics abstracts
Terrane affiliation and terrane boundaries of Mesozoic accretionary complexes,
northeastern North Island, New Zealand: some implications from recycled
clastics
AXEL LEVERENZ*
PETER F. BALLANCE+
Department of Geology
The University of Auckland
Private Bag 92019
Auckland, New Zealand
*Present address: Department of Geological & Environmental Sciences,
Stanford University, Stanford, CA 94305-2115, USA. Email:
leverenz@pangea.stanford.edu
+Corresponding author: 279 Hampden Street, Nelson. Email:
ballance@clear.net.nz
Abstract In the late Mesozoic Waioeka petrofacies in
northeastern North Island, New Zealand, sandstone pebbles differ significantly
in petrography from their enclosing sandy conglomerate matrix, and yield
contrasting provenance signatures. The compositional contrast demonstrates the
extrabasinal origin of most of the analysed clasts. Differences in clast
provenance have been used to review boundaries and the terrane affiliation to
the neighbouring Torlesse and Waipapa composite terranes.
A previously postulated Cretaceous large-scale dextral strike-slip
displacement of eastern North Island along the Wellington-Mohaka-Whakatane
Fault is supported by these data. The timing for this movement can be further
bracketed between c. 98 and 85 Ma. The Waioeka and Omaio petrofacies, formerly
attributed to the Torlesse terranes as the Waioeka Subterrane, are
reinterpreted to constitute a separate terrane (Waioeka-Mata River
Terrane). However, the westernmost portion of the former Waioeka
Subterrane, west of the Wellington-Mohaka-Whakatane Fault, is considered to be
part of the Waipapa composite terrane.
Keywords New Zealand; accretionary terranes; eastern North
Island; petrography; sandstone pebbles; dextral displacement
New Zealand Journal of Geology & Geophysics, 2001, Vol. 44:
589-599
0024-8306/01/4404-0589 $7.00/0 (c) The Royal Society of New Zealand
2001
PDF file of entire paper: medium quality (1330K); (scanned from paper original: notes about this process)
This year's abstracts |
Journal home page |
All abstracts |
Publishing home page
