A5075942871- Geological formations and processes
- Geology and Paleoclimatology Research
- earthquake and tectonic studies
- Geological and Geophysical Studies
- Methane Hydrates and Related Phenomena
- Geological and Geochemical Analysis
- Seismic Imaging and Inversion Techniques
- Hydrocarbon exploration and reservoir analysis
- Geological Studies and Exploration
- Paleontology and Stratigraphy of Fossils
- Geological Modeling and Analysis
- Coastal and Marine Dynamics
- Hydrology and Sediment Transport Processes
- Underwater Acoustics Research
- Seismology and Earthquake Studies
- Microplastics and Plastic Pollution
- Marine Biology and Ecology Research
- High-pressure geophysics and materials
- Landslides and related hazards
- Seismic Waves and Analysis
- Access Control and Trust
- Soil erosion and sediment transport
- Radioactive contamination and transfer
- Radiation Detection and Scintillator Technologies
- Maritime and Coastal Archaeology
University of Auckland
2016-2025
East Sussex County Council
2016
NHS Tayside
2014
University of Manchester
2006-2012
Cardiff University
2002
University of Technology Sydney
1999
ABSTRACT Folds and faults preserved within slump horizons are thought to be the only sedimentary structures that primarily reflect palaeoslope direction. By evaluating methods for analysis of folds, robustness many palaeogeographical reconstructions can tested. Five estimating direction from fold orientation data tested with reference Upper Carboniferous Fisherstreet Slump horizon County Clare, Ireland. These Mean Axis Method, Separation Arc Downslope Average axis Axial–planar Intersection...
Remobilization of sandstones can dramatically reconfigure original depositional geometries and results in very unusually shaped sandstones, which resemble little, if any, the geometry. A number deformational sandstone bodies, dykes volcanoes from upper part Carboniferous Ross Formation are described, offer opportunity to examine a suite field‐scale reconfigured sandstones. These structures located close proximity Slide, outcrops along 2‐km section on northern coast Loop Head Peninsula,...
Abstract The process by which slumps transform into other flow types is an understudied phenomenon; generally, sedimentologists have assumed that this how many debris flows and turbidity currents form, yet there a paucity of information relating to the specific processes involved. This paper aims redress imbalance investigates slump transformation using well‐exposed example, where precursor it was transforming been preserved in outcrop. A detailed field investigation Lower Miocene, Little...
Both the duration and severity of deep-water anoxic conditions across Permian-Triassic mass extinction (PTME) are controversial. Panthalassa Ocean circulation models yield varying results, ranging from a well-ventilated deep ocean to rapidly developing northern-latitude, but not southern-latitude, anoxia in response Siberian Traps–driven global warming. To address this uncertainty, we examined southern-paleolatitude pelagic record. Trace metal pyrite framboid data suggest bottom-water...
Abstract With the COVID-19 pandemic came what media has deemed “port congestion pandemic”. Intensified by pandemic, commonplace anchoring of high-tonnage ships causes a substantial geomorphologial footprint on seabed outside marine ports globally, but isn’t yet quantified. We present first characterisation and extent in low port New Zealand-Aotearoa, demonstrating that ship anchors excavate up to 80 cm, with impacts preserved for at least 4 years. The calcuated volume sediment displaced one...
ABSTRACT The 2016 Mw7.8 Kaikōura Earthquake in Aotearoa New Zealand provides an opportunity to test widely applied turbidite sedimentation models because it triggered a co-seismic turbidity current. resultant event bed (KEB), interpreted as turbidite, is sampled for ∼ 1300-km down-flow along the depositional system. Sediment core lithologies, computed tomography (CT), and particle-size data are used event-bed thickness, silt content, facies distribution, stacking patterns against foundations...
ABSTRACT Subduction trenches receive sediment from gravity flows sourced transverse pathways and trench parallel axial transport pathways. Understanding the interplay between in shaping stratigraphic architectures is hindered by episodic nature of sedimentary limited datasets, yet such insights are crucial for reconstructing flow interpreting records. We investigate routing to northern Hikurangi Trough New Zealand using a combination multibeam, 2D 3D seismic reflection International Ocean...
Pacific ciguatoxin-1 (P-CTX-1), is a highly lipophilic cyclic polyether molecule originating from the marine dinoflagellate Gambierdiscus toxicus. Its effects were investigated on sodium channel subtypes present in acutely dissociated rat dorsal root ganglion neurons, using whole-cell patch clamp techniques. Concentrations of P-CTX-1 ranging 0.2 to 20 nM had no effect kinetics tetrodotoxin-sensitive (TTX-S) or tetrodotoxin-resistant (TTX-R) activation and inactivation, however,...
Abstract Submarine mass‐transport deposits are important in many ancient and modern basins. Mass‐transport can play a significant role exploration as reservoir, seal or source units. Although seismic data has advanced the knowledge about these deposits, more outcrop studies needed to better understand gravity mass flows predict properties of their resultant deposits. It is proposed that sufficiently well‐exposed outcrops be divided into three strain‐dominant morphodomains: headwall,...
Turbidites from three sedimentary basins data, and probably the A.D. 1826 Fiordland earthquake well‐dated 1717 Alpine fault earthquake. The recurrence intervals are shorter than recently published data on land, reflecting mixed fault‐source records potentially increased segmentation offshore. Online Material: Details of laboratory methods analytical techniques applied to sedimentrary cores, photos seafloor substrates fan core, OxCal codes results, sediment transport analysis. [1]:...
Abstract Sediment gravity flows are the primary process by which sediment and organic carbon transported from continental margin to deep ocean. Up 40% of total marine pool is represented cohesive extracellular polymeric substances (EPS) produced microorganisms. The effect these polymers on has not been investigated, despite economic societal importance flows. We present first EPS concentrations measured in deep-sea sediment, combined with novel laboratory data that offer insights into...
Research Article| January 01, 2013 Submarine slope processes in rift-margin basins, Miocene Suez Rift, Egypt Lorna J. Strachan; Strachan † 1School of Earth, Environment & Atmospheric Sciences, University Manchester, M13 9PL, UK2Geology, School Environment, Auckland, Auckland 1142, New Zealand †E-mail: l.strachan@auckland.ac.nz Search for other works by this author on: GSW Google Scholar Frank Rarity; Rarity UK Robert L. Gawthorpe; Gawthorpe UK3Department Earth Science, Bergen, N-5007 Norway...
Abstract The Chatham Rise is located offshore of New Zealand's South Island. Vast areas the are covered in circular to elliptical seafloor depressions that appear be forming through a bathymetrically controlled mechanism, as 2–5 km diameter found water depths 800–1100 m. High‐resolution P‐Cable 3D seismic data were acquired 2013 across one these depressions. depression interpreted mounded contourite. Our reveal several smaller buried (<20–650 m diameter) beneath contourite we interpret...
Distributive submarine fans contain channel-lobe elements that compensationally stack to build a radially dispersive map pattern. The middle parts of some juxtapositions channel and lobe due longitudinal lateral shifts in their transition zones. This article uses an exceptionally well-exposed three-dimensional outcrop the Ross Sandstone at Bridges (Ireland) document stratigraphic plan-view manifestation fans. Observations made herein compare favorably those seafloor studies Navy Submarine...
Abstract Subduction zones serve as carbon recycling centers, where vast amassments of geologic accrete or subduct through thermogenic gas windows over millions years. We focus on New Zealand's Chatham Rise, a fossilized accretionary wedge remnant the ∼400 Myr‐active East Gondwanan margin. undertake an amplitude‐variation‐with‐offset (AVO)‐based seismic analysis abiogenic Mesozoic sedimentary sequence (MES) and overlying Sequence Y chalk interval, which span Rise's northwestern slope....
Abstract Three-dimensional (3D) seismic data reveal the complex interplay between surface topography of a c. 4405 km 3 mass transport deposit (MTD) and overlying sedimentary packages over approximately last two million years. The image part Pleistocene to recent shelf slope basin-floor Giant Foresets Formation in offshore western New Zealand. MTD created substantive topographic relief rugosity at contemporaneous seabed, formed by presence shallow basal detachment surface, very large (up 200...
Abstract The Permian–Triassic mass extinction (PTME) interval is marked by major excursions in both inorganic and organic carbon (C) isotopes. Carbon cycle models predict that these trends were driven large increases productivity, yet C–rich rocks are not recorded most PTME shelf sedimentary successions. Anomalous C-rich facies have been reported from rare abyssal plains records now exposed Japan New Zealand, where black shales at the extraordinarily organic-rich units. We examined matter...
Abstract A revision of the popular equation Richardson and Zaki (1954a, Transactions Institute Chemical Engineering, 32, 35–53) for hindered settling suspensions non‐cohesive particles in fluids is proposed, based on 548 data sets from a broad range scientific disciplines. The new enables predictions velocity wide particle sizes densities, liquid densities viscosities, but with focus sediment water. analysis relationship between size presented here shows that effect increases as decreases,...
Glacio-eustatic cycles lead to changes in sedimentation on all types of continental margins. There is, however, a paucity rate data over eustatic sea-level active subduction zones. During International Ocean Discovery Program Expedition 375, coring the upper ∼110 m northern Hikurangi Trough Site U1520 recovered turbidite-dominated succession deposited during last ∼45 kyrs (Marine Isotope Stages (MIS) 1–3). We present an age model integrating radiocarbon dates, tephrochronology, and δ18O...