The carbonate compensation depth in the South Atlantic Ocean since the Late Cretaceous

Carbonate accumulation rates (CAR) in the South Atlantic through time, with the average CCD for the South Atlantic shown in black, which the CCD in the Walvis Ridge/Rio Grande Rise area is shown in magenta. Deep-sea carbonate deposition is a complex process that is encapsulated in the carbonate compensation depth (CCD)—a facies boundary separating calcareous … Read more…

ANNOUNCING THE LAUNCH OF NEW GPLATES WEBSITE

We are very excited to announce the launch of the newly designed GPlates website. Visit the new website at www.gplates.org. After a few months of team work and dedication, we have made the new GPlates website more responsive and more mobile-friendly. As the development team of the GPlates open source project, our goal with this … Read more…

Weighting of BLEG data with drainage and catchment properties to enhance Au anomalies

Weighting of BLEG data with drainage and catchment properties to enhance Au anomalies Dr. Behnam Sadeghi with Profs. Huseyin Yilmaz and Franco Pirajno, has published this paper in journal “Geochemistry/Chemie der Erde”, based on bulk leachable extractable gold (BLEG) data in Western Turkey, considering several other relevant parameters such catchments’ areas, slopes and curvatures plus … Read more…

Category-based fractal modelling: A novel model to integrate the geology into the data for more effective processing and interpretation

Category-based fractal modelling: A novel model to integrate the geology into the data for more effective processing and interpretation Dr. Behnam Sadeghi and his PhD supervisor, Prof. David Cohen, has published another paper in Journal of Geochemical Exploration. This paper is based on his PhD thesis. In this research, they have proposed two novel fractal … Read more…

Chatting about reconstructing 1 billion years of Earth evolution in Geology Bites podcast

In the latest Geology Bites podcast series, Dietmar Muller talks about the challenges and benefits of reconstructing Earth evolution over a billion years with Oliver Strimpel, former astrophysicist and museum director, and Visiting Professor at the Department of Earth Sciences at Oxford University. https://www.geologybites.com/

Modelling global precipitation since 250 million years ago

We have developed a novel data-driven approach to reconstruct precipitation patterns through geological time, since the supercontinent Pangea was in existence. Our approach involves linking climate-sensitive sedimentary deposits such as coal, evaporites and glacial deposits to a global plate model, reconstructed paleo-elevation maps and high-resolution General Circulation Models via Bayesian machine learning. We model the … Read more…

Nicolas Flament awarded the AAS Anton Hales medal

Dr Nicolas Flament, University of Wollongong Dr Flament works at the interface between geodynamics and geology by novel 4D mathematical modelling of flow deep in Earth’s interior. He makes significant contributions to understanding our planet by connecting the evolution of the deep Earth with the evolution of its surface. He shows Earth was largely a water … Read more…

A geological postcard from Australia to Mars on NASA Perseverance

How a bit of the Australian desert is destined for the Red Planet – A small piece of the Pilbara holds the secret to an ancient geological environment that was common to Earth and Mars 3.5 billion years ago. Find out how Patrice Rey from the School of Geosciences played a pivotal role in unearthing … Read more…

Earth-moving research charts one billion years of tectonic plate movement

New research shows how the earth’s tectonic plates have shifted over the last billion years. Tectonic plates are irregular-shaped slabs of solid rock which can vary massively in size from a few hundred to thousands of kilometres across. Heat from radioactive processes within the planet’s interior causes the plates to shift. And this movement creates … Read more…

Intraplate volcanism triggered by bursts in slab flux

Long-lived, widespread intraplate volcanism without age progression is one of the most controversial features of plate tectonics. Previously proposed edge-driven convection, asthenospheric shear, and lithospheric detachment fail to explain the ~5000-km-wide intraplate volcanic province from eastern Australia to Zealandia. We model the subducted slab volume over 100 million years and find that slab flux drives … Read more…

Coupled evolution of plate tectonics and basal mantle structure

The relationships between plate motions and basal mantle structure remain poorly understood, with some models implying that the basal mantle structure has remained stable over time, while others suggest that it could be shaped by the aggregation and dispersal of supercontinents. Here we investigate the evolution of mantle flow driven by end‐member plate tectonic models … Read more…

Paper in Frontiers of Earth Science: Modeling the Dynamic Landscape Evolution of a Volcanic Coastal Environment Under Future Climate Trajectories

Modeling the Dynamic Landscape Evolution of a Volcanic Coastal Environment Under Future Climate Trajectories Kyle Manley, T. Salles and R. D. Müller As anthropogenic forcing continues to rapidly modify worldwide climate, impacts on landscape changes will grow. Olivine weathering is a natural process that sequesters carbon out of the atmosphere, but is now being proposed … Read more…

Environmental predictors of deep-sea polymetallic nodule occurrence in the global ocean

Abstract: Polymetallic nodules found on the abyssal plains of the oceans represent one of the slowest known geological processes, and are a source of critical and rare metals for frontier technologies. A quantitative assessment of their occurrence worldwide has been hampered by a research focus on the northeastern Pacific Ocean and the lack of a … Read more…

Subduction history reveals Cretaceous slab superflux as a possible cause for the mid-Cretaceous plume pulse and superswell events

Abstract: Subduction is a fundamental mechanism of material exchange between the planetary interior and the surface. Despite its significance, our current understanding of fluctuating subducting plate area and slab volume flux has been limited to a range of proxy estimates. Here we present a new detailed quantification of subduction zone parameters from the Late Triassic … Read more…

Integration of Selective Dimensionality Reduction Techniques for Mineral Exploration Using ASTER Satellite Data

Abstract: There are a significant number of image processing methods that have been developed during the past decades for detecting anomalous areas, such as hydrothermal alteration zones, using satellite images. Among these methods, dimensionality reduction or transformation techniques are known to be a robust type of methods, which are helpful, as they reduce the extent … Read more…

East African topography and volcanism explained by a single, migrating plume

Abstract: Anomalous topographic swells and Cenozoic volcanism in east Africa have been associated with mantle plumes. Several models involving one or more fixed plumes beneath the northeastward migrating African plate have been suggested to explain the space-time distribution of magmatism in east Africa. We devise paleogeographically constrained global models of mantle convection and, based on … Read more…

Surrogate-assisted Bayesian inversion for landscape and basin evolution models

Abstract: The complex and computationally expensive nature of landscape evolution models poses significant challenges to the inference and optimization of unknown model parameters. Bayesian inference provides a methodology for estimation and uncertainty quantification of unknown model parameters. In our previous work, we developed parallel tempering Bayeslands as a framework for parameter estimation and uncertainty quantification … Read more…

Bayesian geological and geophysical data fusion for the construction and uncertainty quantification of 3D geological models

Abstract: Traditional approaches to develop 3D geological models employ a mix of quantitative and qualitative scientific techniques, which do not fully provide quantification of uncertainty in the constructed models and fail to optimally weight geological field observations against constraints from geophysical data. Here, using the Bayesian Obsidian software package, we develop a methodology to fuse … Read more…

Reconstructing seafloor age distributions in lost ocean basins

Abstract: Reconstructions of past seafloor age make it possible to quantify how plate tectonic forces, surface heat flow, ocean basin volume and global sea-level have varied through geological time. However, past ocean basins that have now been subducted cannot be uniquely reconstructed, and a significant challenge is how to explore a wide range of possible … Read more…

Concentration-concentration fractal modelling: a novel insight for correlation between variables in response to changes in the underlying controlling geological-geochemical processes

Behnam Sadeghi has recently published a research paper in “Ore Geology Reviews”. This paper is based on one of the methods Behnam has developed in his PhD thesis. It is about a quite novel fractal model, named Concentration-Concentration (C-C), applied to geochemical anomaly classification. Also, in this paper Behnam has proposed a Bayesian framework, using … Read more…

Controls on soil geochemistry fractal characteristics in Lemesos (Limassol), Cyprus

Behnam Sadeghi has recently published a research paper about urban geochemistry in Cyprus, based on soil data, and using fractal models and statistical analysis. A part of this paper is from his PhD thesis. This is a collaborative project with the Geological Survey of Cyprus and UNSW School of Biological, Earth and Environmental Sciences. ABSTRACT: This … Read more…

PhD Scholarship in Spatio-Temporal Data Mining for Mineral Exploration

Postgraduate research scholarship at the EarthByte Group Up to $105,000 stipend scholarship to support a PhD student to research spatio-temporal data mining for mineral exploration. Highlights Value Eligibility Open date Closing date $35,000 pa (for up to 3 years) Full-time PhD student at the School of Geosciences Hold an honours or master’s degree 1 September 2020 … Read more…

PhD scholarship in plate-plume interactions

Postgraduate research scholarship at the EarthByte Group Up to $84,000 stipend scholarship to support a PhD student to research plate-plume interactions.   Highlights Value Eligibility $28,000 pa (for up to 3 years) Full-time PhD student at the School of Geosciences Hold an honours or master’s degree How to apply Send expressions of interest to Dr … Read more…

PhD scholarship in reconstructing sedimentary evolution of ocean basins

Postgraduate research scholarship at the EarthByte Group Up to $98,000 stipend scholarship to support a PhD student to research reconstructing sedimentary evolution of ocean basins.   How to apply Send expressions of interest to Dr Adriana Dutkiewicz <adriana.dutkiewicz@sydney.edu.au> Use this link to apply for the research stipend scholarship: https://www.sydney.edu.au/scholarships/d/postgraduate-research-scholarship-in-deep-sea-sediments-and-paleoclimate.html and, if you are an international … Read more…

A global dataset of present-day oceanic crustal age and seafloor spreading parameters

Abstract: We present an updated oceanic crustal age grid and a set of complementary grids including spreading rate, asymmetry, direction and obliquity. Our dataset is based on a selected set of magnetic anomaly identifications and the plate tectonic model of Müller et al. (2019). We find the mean age of oceanic crust is 64.2 Myrs, … Read more…

Kinematic and geodynamic evolution of the Isthmus of Panama region: Implications for Central American Seaway closure

Abstract: A major topic of debate in Earth and climate science surrounds the timing of closure of the Central American Seaway. While it is clear that the gateway was closed by ~2.8 Ma, recent studies based on geological and marine molecular evidence have suggested an earlier closing time of early to mid-Miocene. Here, we examine … Read more…

Sea level fluctuations driven by changes in global ocean basin volume following supercontinent break-up

Abstract: Long-term variations in eustatic sea level in an ice-free world, which existed through most of the Mesozoic and early Cenozoic eras, are partly driven by changes in the volume of ocean basins. Previous studies have determined ocean basin volume changes from plate tectonic reconstructions since the Mesozoic; however, these studies have not considered a … Read more…

A Quantitative Tomotectonic Plate Reconstruction of Western North America and the Eastern Pacific Basin

Abstract: Plate reconstructions since the breakup of Pangaea are mostly based on the preserved spreading history of ocean basins, within absolute reference frames that are constrained by a combination of age-progressive hotspot tracks and palaeomagnetic data. The evolution of destructive plate margins is difficult to constrain from surface observations as much of the evidence has … Read more…

Professor Dietmar Müller has been recognised as Australia’s research leader in the field of geophysics!

✨Huge congratulations to Professor Dietmar Müller who has been recognised as Australia’s research leader in the field of geophysics! ✨ The Australian newspaper’s annual research awards acknowledge 17 scholars who are Australia’s leading researchers in chemical and material sciences – one selected from each of the 17 fields in this discipline. They are the researchers with … Read more…

PyGPlates now supports Python 3

PyGPlates now supports Python 3.  You can download pyGPlates:   http://www.gplates.org/download.html What’s new in pyGPlates revision 28:- Windows and macOS support for Python 2.7, 3.5, 3.6, 3.7 and 3.8. macOS libraries signed and notarized by Apple (should no longer get security prompts). Ubuntu support for 16.04 LTS (Xenial), 18.04 LTS (Bionic), 19.10 (Eoan) and 20.04 LTS (Focal). Create topological features (dynamic … Read more…