Evidence for a pre-Eocene proto-Alpine Fault through Zealandia

For many decades, there has been speculation about when the Alpine Fault first became a major regional structure. This paper presents a summary of recently published data, especially U-Pb ages, that supports the existence of a Late Cretaceous to Paleogene proto-Alpine Fault in the form of a thermote...

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Bibliographic Details
Published in:New Zealand journal of geology and geophysics 2018-07, Vol.61 (3), p.251-259
Main Author: Mortimer, Nick
Format: Article
Language:English
Subjects:
Alpine environments
Alpine Fault
Alpine regions
Cretaceous
Eocene
Igneous rocks
Lateral displacement
Magma
Metamorphism
Metamorphism (geology)
Neogene
New Zealand
Paleogene
Schist
Sedimentary basins
tectonics
Zealandia
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Summary:For many decades, there has been speculation about when the Alpine Fault first became a major regional structure. This paper presents a summary of recently published data, especially U-Pb ages, that supports the existence of a Late Cretaceous to Paleogene proto-Alpine Fault in the form of a thermotectonic corridor between North and South Zealandia. The evidence takes the form of fault-controlled sedimentary basins, ductile shear zones, Alpine Schist regional metamorphism and igneous rocks. Much critical evidence has been removed or strongly modified by Neogene shortening and the total lateral displacement history of the proto-Alpine Fault cannot yet be unambiguously determined.
ISSN:0028-8306
1175-8791
DOI:10.1080/00288306.2018.1434211