Ductile fabrics in the zone of active oblique convergence near the Alpine Fault, New Zealand: identifying the neotectonic overprint

Little, TA, Holcombe, RJ and Ilg, BR (2002) Ductile fabrics in the zone of active oblique convergence near the Alpine Fault, New Zealand: identifying the neotectonic overprint. Journal of Structural Geology, 24 1: 193-217. doi:10.1016/S0191-8141(01)00059-1


Author Little, TA
Holcombe, RJ
Ilg, BR
Title Ductile fabrics in the zone of active oblique convergence near the Alpine Fault, New Zealand: identifying the neotectonic overprint
Journal name Journal of Structural Geology   Check publisher's open access policy
ISSN 0191-8141
Publication date 2002
Sub-type Article (original research)
DOI 10.1016/S0191-8141(01)00059-1
Volume 24
Issue 1
Start page 193
End page 217
Total pages 25
Editor T.G. Blenkinsop
D. A. Ferrill
Place of publication United Kingdom
Publisher Pergamon
Collection year 2002
Language eng
Subject C1
780104 Earth sciences
260107 Structural Geology
Abstract The mid-crustal Alpine Schist in central Southern Alps, New Zealand has been exhumed during the past similar to3 m.y. on the hanging wall of the oblique-slip Alpine Fault. These rocks underwent ductile deformation during their passage through the similar to 150-km-wide Pacific-Australia plate boundary zone. Likely to be Cretaceous in age, peak metamorphism predates the largely Pliocene and younger oblique convergence that continues to uplift the Southern Alps today. Late Cenozoic ductile deformation constructively reinforced a pre-existing fabric that was well oriented to accommodate a dextral-transpressive overprint. Quartz microstructures below a recently exhumed brittle-ductile transition zone reflect a late Cenozoic increment of ductile strain that was distributed across deeper levels of the Pacific Plate. Deformation was transpressive, including a dextral-normal shear component that bends and rotates a delaminated panel of Pacific Plate crust onto the oblique footwall ramp of the Alpine Fault. Progressive ductile shear in mylonites at the base of the Pacific Plate overprints earlier fabrics in a dextral-reverse sense, a deformation that accompanies translation of the schists up the Alpine Fault. Ductile shear along that structure affects not only the 12-km-thick section of Alpine mylonites, but is distributed across several kilometres of overlying nonmylonitic rocks. (C) 2001 Elsevier Science Ltd. All rights reserved.
Keyword Oblique Convergence
Transpression
Alpine Fault
Geosciences, Multidisciplinary
Central Southern Alps
Fission-track Analysis
Main-divide
Greenschist Facies
Plate Boundary
Rapid Uplift
Island
Deformation
Strain
Constraints
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Earth Sciences Publications
 
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Created: Tue, 14 Aug 2007, 18:19:33 EST