Geology
Recent Deposits
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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 ... -
Microstructural evolution of polycrystalline ice during non-steady state creep
The mechanics (rheology) of polycrystalline ice Ih are important to understand the dynamics of glaciers, ice sheets and icy moons in the outer solar system. Moreover, the microstructure and rheology of deforming polycrystalline ... -
Proposals for the proving and exploitation of the Buller Gorge uranium field
The discovery was followed by extensive prospecting in the area and early in 1956, prospectors employed by Nelson Lime and Marble Co. Ltd. found highly radioactive conglomerate boulders in the Buller River, in the vicinity ... -
Latest Cretaceous to earliest Paleogene molluscan faunas of New Zealand : changes in composition as a consequence of the break-up of Gondwana and extinction
Uppermost Cretaceous (Campanian?-Maastrichtian) to lowermost Paleogene (Paleocene) rocks of New Zealand contain an exceptional record of Bivalvia, Gastropoda and Scaphopoda. The composition of these faunas is closely linked ... -
Origin of garnet pyroxenites in the Kakanui Mineral Breccia
The southernmost limit that the Hikurangi Plateau subducted beneath New Zealand in the Early Cretaceous has been interpreted from seismic data to be somewhere between Dunedin and Timaru. I test this hypothesis from a ... -
Sedimentologic, petrographic, and tectonic aspects of Torlesse and related rocks: South Island, New Zealand.
Carboniferous to Lower Cretaceous Torlesse rocks and Haast Schist derivatives constitute the major part of the ''eugeosynclinal" facies of the Eastern Province of New Zealand. Strata consist largely of quartzofeldspathic ... -
Causes and Consequences of Heterogeneous Flow Behaviour in Ice
Many ice flow models treat polar ice as chemically pure and mechanically isotropic, while in reality it can have pre-existing crystallographic preferred orientations, soluble impurities, and mechanical heterogeneities which ... -
Mobilisation of arsenic, antimony, and gold in redox-dynamic settings, South Island, New Zealand.
The elements arsenic (As) and antimony (Sb) are commonly enriched in mesothermal gold deposits and predominantly occur as the sulfide minerals arsenopyrite and stibnite, respectively. In such deposits, these sulfides can ...