Wed 17th January @ noon, Rm 312.222 Abstract: The physical and chemical properties of the Earth depend on the atomic to nanoscale structure of their constituent rocks, minerals and fluids. During my talk I will focus on two examples to show how nanoscale processes may control geological processes. The first example focuses on nanoscale transport processes during fluid-rock […]
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Posts in the "Applied Geology" category
Oliver Plümper (Utrecht University) on: Small things matter: nanoscale control of geological processes
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Maria Gritsevich (University of Helsinki) on: Consequences of meteoroid impacts based on atmospheric trajectory analysis
Wed 29th November @ noon, Rm 502C.102 Abstract: One of the important steps in the prediction of an impact threat to Earth raised by potentially hazardous asteroids is the understanding and modeling of the processes accompanying the object’s entry into the terrestrial atmosphere. Such knowledge enables characterization, simulation and classification of possible impact consequences. For observed meteor events […]
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Simon Wilde (Curtin University) on: The Global Hadean Zircon Record: Implications for the Earth’s Oldest Crust
Wed 22nd November @ noon, Rm 407.208 Abstract: Following publication of the first reliable Hadean age from Earth in 1983, the inventory of Hadean zircon grains has grown dramatically in recent years. Initially a preserve of Western Australia, there are now at least sixteen locations globally where Hadean zircon has been recorded. However, the Jack Hills remains […]
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Shujuan Jiao (Curtin University) on: Some insights on monazite behavior during ultrahigh-temperature (UHT) metamorphism: an example from the Khondalite Belt of the North China Craton
Wed 15th November @ noon, Rm 502C.102 Abstract: Monazite is a commonly used accessory mineral for geochronological studies of high-temperature (HT) and UHT metamorphic rocks, because of its extremely high U-Th-Pb closure temperature and low Pb diffusivity. Monazite, which can both grow from prograde apatite incongruent melting, and crystallize from cooling melt, is considered to be more […]
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Crystal LaFlamme (UWA) on: Volatile pathways through the lithosphere: The MIF-S tracer
Wed 1st November @ noon, Rm 312.222 Abstract: The anomalous sulfur isotopic signature ∆33S0 ≠ 0‰ that occurs in a restricted range of sulfur-bearing rock types throughout the geological record has been used to assess the surficial nature of the biological and atmospheric and hydrological sulfur cycle through time. It is widely accepted that ∆33S0 anomalies (∆33S0 […]
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Matthew Mayne (Stellenbosch Univertsity) on: The shape of the P-T path controls the solidus: An investigation of fully-hydrated, fluid-absent anatexis of an average metapelite
Mon 16th October @ noon, Rm 312.222 Abstract: Phase equilibria modelling studies investigating the onset of anatexis in rocks are limited by the assumption of a fixed H2O content in the bulk composition. This limitation is in conflict with the fact that the water content of fluid-absent subsolidus rocks change as a function of pressure and temperature. […]
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Victor Calo (Curtin) on: High-performance phase-field modelling
Wed 4th October @ noon, Rm 312.222 Abstract: Many processes in engineering and sciences involve the evolution of interfaces. Among the mathematical models for these types of problems, the phase-field method has emerged as a possible solution. Cahn and Hilliard initially proposed one of the most popular phase-field descriptions to model phenomena associated with spontaneous phase […]
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Tim Johnson (Curtin) on: Investigating the early earth using phase equilibria
Wed 20th September @ noon, Rm 312.222 Abstract: If we accept that an assumption of thermodynamic equilibrium is reasonable for melt-bearing rocks (> or >>650 °C), phase equilibria modelling provides a powerful tool for the investigation of the processes and geodynamic environment in which they formed and evolved. Until now, quantitative constraints on such high-temperature processes […]
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Peter W Haines (GSWA) on: Drilling reveals simple impact crater stratigraphy and projectile geochemical signature at Hickman Crater, Western Australia
Wed 2nd August @ noon, Rm 312.222 Abstract: The 260 m diameter Hickman Crater is a circular topographic feature in the eastern Hamersley Range, Pilbara Craton. The partly rimmed crater lies along the contact between lower Paleoproterozoic rhyolite and overlying iron formation. A meteorite impact origin was first proposed in 2007. In 2012 a diamond-cored hole […]
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William J. Collins (Curtin University) on: The giga-year pulse of the planet
Wed 26th July @ noon, Rm 312.222 Abstract: The giga-annum periodicity in global radiogenic Hf and Sr isotopic trends is investigated by integrating data from tectonics, geodynamics, and palaeomagnetism, in order to build a holistic geodynamic model linking modes of mantle convection to plate tectonic motions over the last 2,500 Myr. The gigacycle reflects an alternating dominance […]
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