Abstract Cretaceous and Paleocene sedimentation in South Westland, New Zealand, is recorded in the Otumotu Formation, Tauperikaka Coal Measures, Whakapohai Sandstone, Arnott Basalt, Buttress Conglomerate, and Tokakoriri Formation, originally named and mapped by Nathan in 1977. Within this stratigraphic sequence, the name Buttress Conglomerate was used to describe volcanic conglomerates at Porphyry and Buttress Points that contained rounded clasts of plagioclase‐phyric intermediate volcanic rocks. Stratigraphically, the volcanic conglomerate at Porphyry Point forms sharp contacts with the underlying Arnott Basalt (Haumurian) and overlying Tokakoriri Formation (Teurian). The volcanic conglomerate at Buttress Point, however, is entirely fault‐bounded. Clasts from each unit were collected and U‐Pb zircon dated using the TIMS and ELA‐ICP‐MS methods. A trachyandesite clast collected at Buttress Point gives an age of 96.9 ±1.6 Ma, whereas a rhyolite clast collected at Porphyry Point gives an age of 61.4 ± 0.8 Ma. Petrological, geochemical, and stratigraphic data suggest that erosion of the clasts closely followed volcanism, and that these ages accurately reflect the depositional ages of the conglomerates. Conglomerates at Porphyry and Buttress Points have been formally renamed the Porphyry Point Member of the Tokakoriri Formation and the Buttress Point Conglomerate, respectively.

Conglomerate

Buttress

Pebble

10.1080/00288306.2005.9515094

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Citations (15)

Thermal regime in the central Alpine Fault Zone, New Zealand: constraints from microstructures, biotite chemistry and fluid inclusion data

Deleted Journal (2021)

Virginia Toy Dave Craw Alan F. Cooper Richard J. Norris

10.1016/j.endend.2011.05.012

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Citations (0)

Petrology and petrogenesis of carbonatitic rocks in syenites from central Anatolia, Turkey

Contributions to Mineralogy and Petrology (2010)

Alan F. Cooper Durmuş Boztuğ J. Michael Palin Candace E. Martin Mihoko Numata

Carbonatite

Petrogenesis

Xenolith

Fractional crystallization (geology)

Nepheline

Metasomatism

Peralkaline rock

Nepheline syenite

Alkali feldspar

10.1007/s00410-010-0566-3

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Citations (14)

Anatomy, structural evolution, and slip rate of a plate-boundary thrust: The Alpine fault at Gaunt Creek, Westland, New Zealand

Geological Society of America Bulletin (1994)

Alan F. Cooper Richard J. Norris

Research Article| May 01, 1994 Anatomy, structural evolution, and slip rate of a plate-boundary thrust: The Alpine fault at Gaunt Creek, Westland, New Zealand ALAN F. COOPER; ALAN F. COOPER 1Geology Department, University of Otago, P. O. Box 56, Dunedin, New Zealand Search for other works by this author on: GSW Google Scholar RICHARD J. NORRIS RICHARD J. NORRIS 1Geology Department, University of Otago, P. O. Box 56, Dunedin, New Zealand Search for other works by this author on: GSW Google Scholar Author and Article Information ALAN F. COOPER 1Geology Department, University of Otago, P. O. Box 56, Dunedin, New Zealand RICHARD J. NORRIS 1Geology Department, University of Otago, P. O. Box 56, Dunedin, New Zealand Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1994) 106 (5): 627–633. https://doi.org/10.1130/0016-7606(1994)106<0627:ASEASR>2.3.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation ALAN F. COOPER, RICHARD J. NORRIS; Anatomy, structural evolution, and slip rate of a plate-boundary thrust: The Alpine fault at Gaunt Creek, Westland, New Zealand. GSA Bulletin 1994;; 106 (5): 627–633. doi: https://doi.org/10.1130/0016-7606(1994)106<0627:ASEASR>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Minimum slip rates calculated for plate-vector-parallel slickenside trends in cataclasite on the sole of the Alpine fault at Gaunt Creek, Westland, New Zealand, range from 18 to 24 mm/yr. Between half and two-thirds of the total relative motion between the Pacific and Australian plates is being accommodated by movement on a single structure, the Alpine fault.During the past 14 ka, the leading edge of the Alpine fault has changed from a moderately southeast-dipping, oblique reverse fault to a shallowly dipping thrust. The hanging wall (Pacific plate) is composed of a gradational sequence from basal gouge, through pseudotachylite-bearing cataclasite, to progressively more coherent schist-derived mylonite, which has been faulted against subhorizontally bedded, fluvio-glacial gravel in the footwall (Australian plate). During uplift the hanging-wall sequence has been internally sheared and imbricated, producing duplex structures, and retrogressively veined and altered by pervasive hydrothermal fluid flow.Erosion of the exhumed fault zone produced angular, cataclasite- and mylonite- derived, talus-fan breccias, building a west-dipping apron beneath the fault scarp. Wood fragments from near the base off the talus breccias have been 14C dated at 12,650 ± 90 yr B.P. Progressive tectonic shortening resulted in 180 m of overthrusting of a schist-derived nappe across an irregular talus fan surface composed of its own erosional debris. The structural history of the Alpine fault at Gaunt Creek illustrates the importance of the interaction between fault-induced topography and erosion, and the control these processes exert on the continued tectonic, geometric, and geomorphic evolution of the fault zone. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

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Thrust fault

10.1130/0016-7606(1994)106<0627:aseasr>2.3.co;2

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Citations (93)

Lithospheric removal: The cause of widespread Cenozoic intraplate volcanism on Zealandia?

Geochimica et Cosmochimica Acta (2006)

Kaj Hoernle John C. White Paul van den Bogaard Folkmar Hauff D. S. Coombs

10.1016/j.gca.2006.06.514

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Citations (0)

Strain localisation on a major plate boundary fault zone: the Alpine Fault, New Zealand

EAEJA (2003)

Richard J. Norris Alan F. Cooper

Strain (injury)

Source

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Accessory Mineral U-Pb Ti-Zr Thermochronology of the Deep Crust of Zealandia: Rift, Breakup and Drift from 90-20 Ma

AGU Fall Meeting Abstracts (2006)

Andreas Beinlich J. Michael Palin Alan F. Cooper

Thermochronology

Source

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Citations (0)

Geology, geochronology and geochemistry of a basanitic volcano, White Island, Ross Sea, Antarctica

Journal of Volcanology and Geothermal Research (2007)

Alan F. Cooper Lotte J. Adam Roseanne F. Coulter G. Nelson Eby William C. McIntosh

Lapilli

Phenocryst

Diatreme

10.1016/j.jvolgeores.2007.06.003

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Citations (66)

Origin of small-scale segmentation and transpressional thrusting along the Alpine fault, New Zealand

Geological Society of America Bulletin (1995)

Richard J. Norris Alan F. Cooper

Research Article| February 01, 1995 Origin of small-scale segmentation and transpressional thrusting along the Alpine fault, New Zealand Richard J. Norris; Richard J. Norris 1Geology Department, University of Otago, P.O. Box 56, Dunedin, New Zealand Search for other works by this author on: GSW Google Scholar Alan F. Cooper Alan F. Cooper 1Geology Department, University of Otago, P.O. Box 56, Dunedin, New Zealand Search for other works by this author on: GSW Google Scholar Author and Article Information Richard J. Norris 1Geology Department, University of Otago, P.O. Box 56, Dunedin, New Zealand Alan F. Cooper 1Geology Department, University of Otago, P.O. Box 56, Dunedin, New Zealand Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1995) 107 (2): 231–240. https://doi.org/10.1130/0016-7606(1995)107<0231:OOSSSA>2.3.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Richard J. Norris, Alan F. Cooper; Origin of small-scale segmentation and transpressional thrusting along the Alpine fault, New Zealand. GSA Bulletin 1995;; 107 (2): 231–240. doi: https://doi.org/10.1130/0016-7606(1995)107<0231:OOSSSA>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract The Alpine fault is the major structural feature of the Australian-Pacific plate boundary in the South Island of New Zealand. Geologic evidence suggests that half to three-quarters of the plate boundary displacement is accommodated by movement on the fault. Detailed investigation of the central section of the Alpine fault has revealed that it consists of oblique thrust sections striking 020°–050° that are linked by subvertical right-lateral faults striking between 065° and 090°. The segmentation is on a scale of 1–10 km. Similarly oriented right-lateral faults are abundant southeast of the Alpine fault and are consistent with stresses induced in an elastic layer by an oblique-slip ductile fault zone below. Propagation of the fault to the surface is predicted to result in an en echelon arrangement of strike-slip and thrust segments. It is suggested that the spatial distribution of segments is affected by the existence of deeply incised valleys in the hanging wall that disturb the stress field to depths of 1–4 km. The segmentation is near surface and does not appear to act as a barrier to the propagation of large earthquakes. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

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10.1130/0016-7606(1995)107<0231:oosssa>2.3.co;2

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Citations (141)