Software Is Unlocking The Mystery Of Why Rivers Change

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Colombian geologist Sara Polanco uses a computer-game-like river modelling software to understand the processes that make and connect river networks, hopefully providing the tools to help better manage water resources in the future. “That software allows me to simulate how rivers change under different scenarios,” Polanco says, “In a sense, it is like a computer game where … Read more…

EarthByte Seminar Series: Dr. Samuel C Boone

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EarthByte Seminar Series presents the first talk of this year by Dr. Samuel C Boone from the University of Melbourne, titled “THERMOCHRONOLOGICAL INSIGHTS INTO CONTINENTAL BREAKUP PROCESSES.” The seminar will be held in the Madsen Building Room 449 (Conference Room) from 11 am (AEDT)  Wednesday, 18th January. You are also welcome to join us live via Zoom (link: https://uni-sydney.zoom.us/j/86426471159). For more information on the seminar, see below:

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EarthByte seminar series: Nicole Januszczak

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This week brings the final EarthByte seminar of the year, featuring Nicole Januszczak of BHP, titled “Exploration at BHP: Putting mineral systems into action.” The seminar will be held in the Madsen Building Room 331 at 11am-12pm this Wednesday 14th December, and will also streamed live via Zoom (link: https://uni-sydney.zoom.us/j/82037433636). For more information on the seminar, see below:

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J. Struct. Geol.: Microstructural and textural modification of columnar calcite under increasing shear strain (Evia Island, Greece)

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We studied the microstructural and textural modification of columnar calcite naturally deformed at increasing shear strain. The studied marbles were sampled from different structural levels of the Basal Unit of the Cycladic Massif on Evia Island, Greece. The marbles have experienced high pressure metamorphism at peak temperatures around 350 °C. The long axes of the columnar calcite grains and their c-axes were … Read more…

Geol. Soc. London Mem.: Effects of melt-percolation, refertilization and deformation on upper mantle seismic anisotropy: constraints from peridotite xenoliths, Marie Byrd Land, West Antarctica

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We report on the petrology, microstructure and seismic properties of 44 peridotite xenoliths extracted from the upper mantle beneath Marie Byrd Land (MBL), West Antarctica. The aim of this work is to understand how melt-rock reaction, refertilization, and deformation affected the seismic properties (velocities, anisotropy) of the West Antarctic upper mantle, in the context of … Read more…

Future Mining: Travelling through geological time to find copper deposits

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Travel through geological time to find copper deposits via our article in the inaugural issue of the Future Mining Magazine. https://future-mining.partica.online/future-mining/vol-1-no-1/flipbook/60/ Plate reconstructions at 1000, 400, 300, 200, 100 million years ago and at present-day. Ancient ocean basins are shown in white with continents in grey, and coloured arrows showing plate speed and direction. Mid-ocean … Read more…

Scientific Reports: Javanese Homo erectus on the move in SE Asia circa 1.8 Ma

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The migration of Homo erectus in Southeast Asia during Early Pleistocene is cardinal to our comprehension of the evolution of the genus Homo. However, the limited consideration of the rapidly changing physical environment, together with controversial datings of hominin bearing sites, make it challenging to secure the robust timeline needed to unveil the behavior of early humans. Here, … Read more…

Marine Geology: Tidal dynamics drive ooid formation in the Capricorn Channel since the Last Glacial Maximum

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Relative sea-level changes can dramatically alter coastal geomorphology and coastlines, which, in turn, can fundamentally alter tidal regimes. The Great Barrier Reef (GBR) has undergone around 120 m of relative sea level (RSL) rise since the Last Glacial Maximum, ∼20,000 years ago (ka). Ooid grains (sand sized carbonate sediment) that formed in shallow water (>5 m depth) … Read more…

Geoscience Letters: Geophysical model generation with generative adversarial networks

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With the rapid development of deep learning technologies, data-driven methods have become one of the main research focuses in geophysical inversion. Applications of various neural network architectures to the inversion of seismic, electromagnetic, gravity and other types of data confirm the potential of these methods in real-time parameter estimation without dependence on the starting subsurface … Read more…

Nature Reviews Earth and Environment: A glimpse into a possible geomorphic future of Tibet

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The Tibetan Plateau plays a central role in global atmospheric circulation, acts as a key biodiversity hotspot, and delivers fresh water for more than 20% of the global population. Projecting its future uplift and erosion trajectory over geological time can offer potential testable hypotheses into interactions between tectonic and surface processes. Rey, P., Salles, T., … Read more…

Geochemistry, Geophysics, Geosystems: The history of Cenozoic carbonate flux in the Atlantic Ocean constrained by multiple regional carbonate compensation depth reconstructions

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The Atlantic is the only ocean basin almost entirely surrounded by passive margins, and a major global long-term sink of carbonate carbon that has evaded subduction. Quantifying the history of carbonate accumulation in the Atlantic has been limited by the absence of well-defined regional carbonate compensation depth (CCD) models. We determine the CCD for the … Read more…

EarthByte seminar series: Ben Fulcher

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The next EarthByte seminar will be held at 11am–12pm on Wednesday 16th November in Madsen Seminar Room 331 at the University of Sydney. This week we will be hearing from Ben Fulcher from the Dynamics and Neural Systems Group within the School of Physics at the University of Sydney, discussing his work on “Quantifying patterns in time series.” As usual, the seminar will be streamed live over Zoom at the following link: https://uni-sydney.zoom.us/j/82037433636.

More details are below:

Quantifying patterns in time series

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EOS: Billion-year rewind tracks supercontinents and mantle structures

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AGU Science News: Billion-Year Rewind Tracks Supercontinents and Mantle Structures – EOS has featured our recent paper on tracing past pathways of tectonic plates and their boundaries back a billion years. The article highlights how our work on solid Earth system evolution is driving “a second plate tectonic revolution”., inspiring future work to test and … Read more…

EarthByte seminar series: Nick Mortimer

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The next installment of the EarthByte seminar series will be held at 11am–12pm next Wednesday 5th October, featuring Nick Mortimer from GNS Science in New Zealand. The seminar will be held in the Madsen Building Rm 449 at the University of Sydney, and streamed live on Zoom at this link: https://uni-sydney.zoom.us/j/82037433636.

Further details on the talk are below:

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The formation of atolls: new insights from numerical simulations

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Several theories have been proposed to explain atoll formation. While karst dissolution during glacial periods and preferential coral reef accretion along raised bank margins during deglaciations and interglacials have been invoked to explain atoll formation, the respective roles of karst dissolution and reef margin construction in atoll formation have not been adequately evaluated by simulations. … Read more…

Welcome to two new PhD students — Satyam Pratap Singh and Tom New

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Welcome to two new PhD students who have joined the EarthByte Group. Satyam Pratap Singh has joined the Stellar project working on reconstructions of palaeogeography through time and will be jointly supervised by Maria Seton, Sabin Zahirovic and Nicky Wright. Tom New has joined a recently funded ARC Discovery Project on plate-plume interactions and will … Read more…

Nature Communications: Coupled influence of tectonics, climate, and surface processes on landscape evolution in southwestern North America

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The Cenozoic landscape evolution in southwestern North America is ascribed to crustal isostasy, dynamic topography, or lithosphere tectonics, but their relative contributions remain controversial. Here we reconstruct landscape history since the late Eocene by investigating the interplay between mantle convection, lithosphere dynamics, climate, and surface pro- cesses using fully coupled four-dimensional numerical models. Our quantified … Read more…

Environmental stability on Earth allowed marine biodiversity to flourish

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Modern ocean biodiversity, which is at its highest level ever, was achieved through long-term stability of the location of so-called biodiversity hotspots, regions of especially high numbers of species, scientists have found. The findings, published in Nature, were reached through a pioneering model that reconstructs the diversity of marine animals from their origin – some … Read more…

Nature: Post-extinction recovery of the Phanerozoic oceans and biodiversity hotspots

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The fossil record of marine invertebrates has long fuelled the debate as to whether or not there are limits to global diversity in the sea. Ecological theory states that, as diversity grows and ecological niches are filled, the strengthening of biological interactions imposes limits on diversity. However, the extent to which biological interactions have constrained … Read more…

Solid Earth: A tectonic-rules-based mantle reference frame since 1 billion years ago – implications for supercontinent cycles and plate–mantle system evolution

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Understanding the long-term evolution of Earth’s plate-mantle system is reliant on absolute plate motion models in a mantle reference frame, but such models are both difficult to construct and controversial. We present a tectonic rules-based optimisation approach to construct a plate motion model in a mantle reference frame covering the last billion years and use … Read more…

G-cubed: Slow Geodynamics and Fast Morphotectonics in the Far East Tethys

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How can the sluggish, long-wavelength mantle convection be expressed by so many time and space scales of morphotectonic activity? To investigate these relationships, we explore the Java-Banda subduction zone, where geodynamic records cluster. In the far-East Tethys, the exceptionally arcuate Banda subduction zone circumscribes the deepest oceanic basin on Earth, seismotectonic activity slices the upper … Read more…

Front Earth Sci: Two-step Gravity Inversion Reveals Variable Architecture of African Cratons

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The lithospheric build-up of the African continent is still to a large extent unexplored. In this contribution, we present a new Moho depth model to discuss the architecture of the three main African cratonic units, which are: West African Craton, Congo Craton, and Kalahari Craton. Our model is based on a two-step gravity inversion approach … Read more…

PyBacktrack 1.4 released

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PyBacktrack 1.4 is now available, and adds support for generating paleobathymetry grids from submerged present-day crust. PyBacktrack is available as a Python package and a Docker image. Installation instructions can be found online in the pyBacktrack documentation. Changes since version 1.3: Can now generate paleobathymetry grids: Submerged oceanic and continental present-day crust is backtracked and … Read more…

Extending full-plate tectonic models into deep time: Linking the Neoproterozoic and the Phanerozoic

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Recent progress in plate tectonic reconstructions has seen models move beyond the classical idea of continental drift by attempting to reconstruct the full evolving configuration of tectonic plates and plate boundaries. A particular problem for the Neoproterozoic and Cambrian is that many existing interpretations of geological and palaeomagnetic data have remained disconnected from younger, better-constrained … Read more…

Plate tectonic carbon cycle explains how Earth maintains a Goldilocks climate

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Earth’s hot and cold climates driven by tectonic plate speeds A new study has revealed how the plate tectonic carbon cycle maintains a “Goldilocks climate” on Earth that is neither too hot nor too cold. It is now established that CO2 emissions from burning fossil fuels are driving atmospheric CO2 above 400 parts per million … Read more…

Evolution of Earth’s tectonic carbon conveyor belt

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This video shows plate motions, carbon storage within tectonic plates and carbon degassing along mid-ocean ridges and subduction zones through time. Our carbon model shows these processes alone cannot explain global cooling in the Cenozoic Era. The effects of rock erosion, not shown here, played a key role. Arrows indicate plate motion speed relative to … Read more…

Postgraduate Research Scholarship in Deep-time exploration for mineral deposits along convergent margins

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Postgraduate research scholarship at the EarthByte Group for international and domestic students. Up to $107,850 stipend scholarship to support a PhD student to research in deep-time exploration for mineral deposits along convergent margins   Highlights Value Eligibility Open date Closing date $35,950 pa (for up to 3 years, with a possible 6 month extension) Full-time … Read more…