A5087874892- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Geochemistry and Geologic Mapping
- earthquake and tectonic studies
- Geological Studies and Exploration
- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Hydrocarbon exploration and reservoir analysis
- Paleontology and Stratigraphy of Fossils
- Geological and Geophysical Studies
- Geochemistry and Elemental Analysis
- Mineralogy and Gemology Studies
- Radioactive element chemistry and processing
- Astro and Planetary Science
- Geological Modeling and Analysis
- Advanced Frequency and Time Standards
- Nuclear Physics and Applications
- Seismology and Earthquake Studies
- Atmospheric and Environmental Gas Dynamics
- Chemical Synthesis and Characterization
- Mining and Gasification Technologies
- Minerals Flotation and Separation Techniques
- Origins and Evolution of Life
- Solid State Laser Technologies
- Isotope Analysis in Ecology
The University of Adelaide
2017-2024
University of Bern
2022-2024
The preserved Archean continental crust is dominantly comprised of tonalite-trondhjemite-granodiorite (TTG) suites associated with less abundant low-grade greenstone belts. exact processes that form TTGs, as well the source rock they are derived from, difficult to constrain from sparse geological record. However, studies show water-present partial melting metamorphosed basalt at temperatures 750–950 °C required produce large volumes melt TTG compositions. In this contribution, we investigate...
The development of in situ laser ablation Lu–Hf geochronology apatite, xenotime and garnet has opened avenues to quickly directly date geological processes. We demonstrate the first use campaign-style across high- ultrahigh-pressure Western Gneiss Region Norway. Mafic eclogites from this region have been focus much work, were clearly formed during continental subduction Caledonian Orogeny. However, abundant quartzofeldspathic pelitic lithologies record a more complex history, with some...
Abstract Garnet is a fundamental expression of metamorphism and one the most important minerals used to constrain thermal conditions crust. We innovative in situ laser-ablation ICP-MS/MS Lu-Hf geochronology demonstrate that garnet metapelitic rocks enclosing Cambrian eclogite southern Australia formed during Laurentian Mesoproterozoic metamorphism. porphyroblasts amphibolite-facies yielded ages between 1286 ± 58 Ma 1241 16 Ma, revealing record older was partially obscured by metamorphic...
Re‐Os isotope‐dilution geochronology has been widely used to date the timing of molybdenite, pyrite and chalcopyrite formation across a variety geological settings. However, in situ methods have impeded by isobaric interference 187 Re on Os. In using LA‐ICP‐MS/MS shown be useful technique chemically separate Os from Re, as reacts with CH 4 create higher‐mass reaction products, which can then measured minimised Re. application method requires matrix‐matched primary reference materials, e.g.,...
The development of in-situ Lu-Hf LA–ICP–MS/MS geochronology has opened avenues to dating garnet, apatite, xenotime, calcite and epidote-group minerals. Of these phases, garnet apatite are particularly relevant provenance analysis, as both can be dated in situ by the U–Pb, Sm–Nd Lu–Hf systems, often present sediments, retain geochronological well geochemical information during erosion, transport sedimentation. Garnet also have benefit forming...
The geological water cycle (or the deep cycle) consists of water-rock interactions between hydrosphere/atmosphere and lithosphere. This plays a critical role in processes, for example, promoting melting formation new continental crust, mobilisation economic metals, rock reactivity rheology, seismic activity. In modern day, most dominant form is uptake mantle-derived rocks oceans, release this during subduction to melt overlying lithologies volcanic arcs. Archean, however, less well...
Mapping of trace element signatures is an expanding tool in geoscience and material sciences, which allows the study solid materials, processes that may not be captured by major elements. Developments laser-ablation inductively-coupled-plasma mass-spectrometry (LA-ICP-MS) capabilities last decade now provide necessary spatial resolution for situ mapping. The acquisition two-dimensional, fully quantitative geologically meaningful data with LA-ICP-MS still a challenging task, particular...
Abstract Lawsonite eclogite and garnet blueschist occur as metre‐scale blocks within serpentinite mélange in the southern New England Orogen (SNEO) eastern Australia. These high‐ P fragments are products of early Palaeozoic subduction palaeo‐Pacific plate beneath East Gondwana. Lu–Hf, Sm–Nd, U–Pb geochronological data from Port Macquarie show that mineral assemblages formed between c. 500 470 Ma ago became mixed together a serpentinite‐filled channel. Age P–T modelling indicate lawsonite at...
Abstract Igneous and metamorphic rocks contain the mineralogical geochemical record of thermally driven processes on Earth. The generally accepted thermal budget mantle indicates a steady cooling trend since Archean. geological record, however, this simple model may not hold true. Subduction-related eclogites substantially emerge in rock from 2.1 Ga to 1.8 Ga, indicating that average conditions cooled below critical threshold for widespread eclogite preservation. Following period,...
Abstract Ultrahigh temperature ( UHT ) granulites in the Eastern Ghats Province EGP have a complex P–T–t history. We review P–T histories of metamorphism and use that as framework for investigating history Mg–Al‐rich from Anakapalle, with express purpose trying to reconcile down‐pressure‐dominated path other localities . Mafic granulite is host metasedimentary at Anakapalle has protolith age c 1,580 Ma. within mafic were metamorphosed conditions during tectonism 960–875 Ma, meaning was not...
Abstract In this study, data from garnet‐kyanite metapelites in ultrahigh‐pressure (UHP) domains of the Western Gneiss Region (WGR), Norway, are presented. U–Pb geochronology and trace element compositions zircon, monazite, apatite, rutile garnet were acquired, pressure–temperature ( P–T ) conditions calculated using mineral equilibria forward modelling Zr‐in‐rutile thermometry. Garnet‐kyanite gneiss Ulsteinvik record a prograde evolution passing through ~690–710°C ~9–11 kbar. Zircon age...
Abstract. The coupling behaviour of H+ and trace elements in rutile has been studied using situ polarised Fourier transform infrared (FTIR) spectroscopy laser ablation inductively coupled plasma mass spectrometry (LA–ICP–MS) analysis. H2O contents can be precisely accurately quantified from FTIR measurements on single grains situ. benefits this novel approach compared to traditional quantification methods are the preservation textural context heterogeneities water rutile. Rutile six...
To understand the onset and evolution of cold subduction on Earth, detrital sedimentary rocks Precambrian age, potentially derived from exposed high-P low-T metamorphic can be investigated. This requires estimation peak pressure temperature, time formation, source lithology (P-T-t-X) single grains. Rutile is a common accessory mineral in subducted oceanic crust one most likely minerals to survive sedimentation processes. As grain T-t-X estimates rutile are possible, it prime candidate for...
The oxidation of iron from rocks during subaqueous alteration is a key source the molecular hydrogen (H2) used as an energy by chemosynthetic organisms, which may represent some earliest forms life on Earth. In Archean, potential ultramafic material available for serpentinisation reactions that release H2 are komatiites. Komatiites highly magnesian lavas, contain evidence extensive and magnetite (Fe2+Fe3+2O4) production close to Archean seafloor. in komatiitic compositions has been modelled...