Dr Vasileios Chatzaras

Academic Staff

vasileios.chatzaras@sydney.edu.au

Phone:
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Madsen Building F09, Room 400
School of Geosciences
The University of Sydney
Sydney, NSW 2006
Australia

View Vasileios’s Sydney Uni page

See below for EarthByte content related to Vasileios.

Why Does the Broken Hill Deposit Sit in Resistive Crust? Magnetotelluric Evidence for Metamorphic Decoupling of a World‐Class Mineral System

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Regional gravity and magnetic anomaly maps showing tectonic boundaries and the location of the Broken Hill deposit, NSW, Australia.

Researchers used magnetotelluric surveys to image the electrical structure of the crust around the world-class Broken Hill Pb-Zn-Ag deposit in NSW, Australia. They found that the upper crust here is mostly resistive, with only small, isolated conductive zones linked to the ore body and its host rocks, which do not connect down to a deeper … Read more…

Thickness of an extensional plate-boundary shear zone in the mantle: Implications for tectonic controls on strain localization and transient strain rates

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This study shows that constant displacement rate conditions – imposed by plate tectonics – is the best approach to consider the evolution of extensional plate-boundary shear zones, as stresses vary during deformation. The Turon de Técouère massif of the French Pyrenees preserves a Cretaceous, magma-poor hyperextended plate margin within the lithospheric mantle. The massif exposes an extensional … Read more…

Strain controls the electrical conductivity distribution in the lithosphere

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Magnetotellurics (MT) utilize measurements of electromagnetic fields at Earth’s surface to image the electrical conductivity distribution at depths from a few meters to ∼200 km. MT is especially powerful for mapping mineralized fluid pathways, as it is sensitive to inter- connected minor conductive phases such as fluids, melts, or sulfides. However, conductivity anomalies documented by … Read more…

SAnTex: A Python-based Library for Seismic Anisotropy Calculation

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Seismic anisotropy, the directional dependency of seismic wave velocities, is important for mapping the Earth’s structure and understanding geodynamic processes. Seismic anisotropy primarily stems from the development of mineral crystallographic preferred orientation (i.e. texture) during the plastic deformation of rocks. In-depth analysis of data from texture characterization techniques like Electron Backscatter Diffraction (EBSD) enables the … Read more…

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…

EarthByte Honours and Masters Projects 2020

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EarthByte has now released a list of Honours/Masters projects to be offered in 2020. These projects are outlined below. We can also tailor projects to your interests. Feel free to contact us by clicking the supervisor links below. Project Title Supervisor(s) How climate and subsidence control the sedimentation along the Norwegian Margin? Claire Mallard , … Read more…

EarthByte Honours and Masters Projects 2019

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EarthByte has now released a list of Honours/Masters projects to be offered in 2019. These projects are outlined below. Project Title Supervisor(s) How is landscape complexity driving biodiversity over geological time scales? Tristan Salles & Patrice Rey How well are tectonic and climatic signals preserved in the stratigraphic record? Tristan Salles & Claire Mallard Vertical motions … Read more…