Geology
Recent Deposits
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An investigation into the characterisation of seismic traces: optimising shear wave signals with source type, orientation and survey geometry
Seismic surveys are used to create visual representations of subsurface geology by detecting the reflections and refractions of seismic waves. In most cases, the seismic wave of interest is the P-wave, the easiest wave to ... -
Petrogenesis, eruption and emplacement of the volcanic rocks at Otapahi, Otago Peninsula.
Intraplate volcanism is a globally common phenomenon that remains poorly understood. It formed the Dunedin Volcano at 16-10 Ma, with the oldest known exposures located at Otapahi, on Otago Peninsula. Investigation of the ... -
Tracing the geochemical signature of New Zealand river sediments : transport, elemental fluxes and oceanic deposition
Chemical and physical erosion processes have been investigated in a wide range of high sediment-yielding rivers from New Zealand using major and trace element data from suspended sediments and fluvial bedload grain size ... -
Two Giant Penguins from the Eocene-Oligocene of Otago, New Zealand
Two new species of giant fossil penguin from near the Eocene-Oligocene boundary in Otago, New Zealand, are described. OU 22761 is from the Wharekuri Greensand of the Kye Burn upper river valley, probably from geomagnetic ... -
Andesitic glaciovolcanic interactions at Tongariro and Ruapehu volcanoes, New Zealand
Glaciers that cap or flank volcanoes have a major control on the eruption style and distribution of volcanic material. Ancient deposits that were formed by the interaction of lava and ice inform our understanding of ... -
The Water Quality and Geochemistry of Legacy Acid Mine Drainage on the Denniston Plateau, West Coast
The Eocene Brunner Coal Measures on the West Coast of New Zealand are pyritic, paired with low neutralisation capacity in the coal measures, resulting in a high acid producing potential. Historic mining located on the ... -
The structure, petrology and mechanics of a plate-boundary-scale serpentinite shear zone: The Livingstone fault, New Zealand
Serpentinite-bearing shear zones are important in a range of tectonic settings, including the slab-mantle interface, oceanic detachment faults, and large-displacement transform faults in the oceanic and continental ... -
Geology of Takitimu group rocks in the Nugget Hill region, western Southland, New Zealand
An area approximately 31 km2, centered around Nugget Hill in western Southland was mapped in detail. The geology in this area is dominated by Takitimu Group lithologies which are intruded by the White Hill Intrusive Suite. ... -
The structural and metamorphic geology of the Brighton - Taieri Mouth area, east Otago, New Zealand
[…] The primary purpose of the present study is to reveal as clearly as possible the structure and stratigraphy of the pre-Cretaceous basement rocks, mainly the Otago schist, of the area, and to determine if possible the ... -
Surtseyan volcanism: case studies from Pahvant Butte and Black Point, Western USA
Shallow to emergent basaltic subaqueous explosive eruptions, here referred as Surtseyan, are a source of pyroclastic material expelled from subaqueous vents and transferred to the water column and atmosphere. They can ... -
Swinburn Volcanic Complex, Central Otago, New Zealand
Swinburn Volcanic Complex is the remnant of a Miocene volcano, forming part of the Dunedin Volcanic Group (~ 24 - 9Ma), on the South Island of New Zealand. It is part of the Waipiata Volcanic Field, and its basalts are ... -
Mechanics of folding in central Otago : an investigation of the recent deformation of the Rock and Piller Range
Cenozoic deformation of the Central Otago Range and Basin province has been investigated to determine the mechanism of range formation. Mapping in the Rock and Pillar Range revealed macroscopic folds in schistosity which ... -
Eocene turtles and whales from New Zealand
This thesis documents eleven specimens of Eocene turtles (Reptilia: Testudines: Dermochelyidae, Cheloniidae) and seven specimens of archaeocete whales (Mammalia: Cetacea: Basilosauridae) from New Zealand. All taxa derive ... -
Submarine Eruptive Processes in the Brook St Terrane at Colac Bay, Southland, New Zealand
A sequence of volcanic and volcaniclastic rocks of the Brook Street Terrane crops out along the Southland coast from Howells Point, Riverton, into Colac Bay. This sequence provides an along-strike exposure, revealing lateral ... -
Analysis of Reservoir Fracture Sealing in an Active Geothermal System, Kawerau Geothermal Field, New Zealand
The microscopic crystallographic structures of geothermal minerals precipitated in fractures located within active geothermal reservoirs have the potential to record significant information concerning the kinematics of ... -
Paragenesis and structure of high-grade, high-angle, gold veins at Macraes mine in the Hyde Macraes Shear Zone, east Otago
The Hyde-Macraes Shear Zone (HMSZ) in east Otago is a 25 km long regionalscale structure that hosts New Zealand’s largest gold mine. OceanaGold (NZ) Ltd.’s mine at Macraes has produced over 4 Moz gold from a total resource ... -
Arsenic : the influence of natural parameters on its oxidation and mobilization in gold mines
Arsenic (As) is a common constituent of mining and geothermal systems. Literature has described the element as a toxin and human carcinogen particularly when it exists as As (III). Wairakei (North Island, New Zealand) ... -
Characterisation of the sediment budget of Otago Harbour : a geophysical and sedimentological study
Urban tidal inlets often lend themselves to economically important port development. In many cases, such inlets are artificially deepened and maintained for continuous human use. A range of ecological, hydrological, ... -
3D Gravitational Inversion Modelling of the South Dunedin Sub Basin, Otago, New Zealand
3D gravitational modelling of an infilled coastal sedimentary basin is rare, with almost all 3D gravity publications being based on mineral deposits related to hard rock mineral density features. The sediment-bedrock ... -
Hydrothermal alteration within the alpine fault zone
Hydrothermal alteration, hosted in brittle structures, has been documented along the length of the Alpine Fault Zone. The along-strike profile has been divided into two geographical groups based on differing fault zone ...