Graham Begg

University of Western Australia

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William L. Griffin

Macquarie University

Suzanne Y. O′Reilly

ARC Centre of Excellence for Core to Crust Fluid Systems

Jon Hronsky

University of Western Australia

ЕБ

Елена Белоусова

Macquarie University

L. M. Natapov

Macquarie University

Juan Carlos Afonso

University of Twente

Mark Jessell

University of Western Australia

Karl E. Karlstrom

University of New Mexico

Stephen F. Foley

Macquarie University

N. J. Hayward

Guangzhou Institute of Geochemistry

Cooperative Institutions

ARC Centre of Excellence for Core to Crust Fluid Systems

Macquarie University

Australian Research Council

University of Western Australia

Centre National de la Recherche Scientifique

Target (United States)

Géosciences Environnement Toulouse

Institut de Recherche pour le Développement

Université Toulouse III - Paul Sabatier

Université de Toulouse

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The Proterozoic: hiding Archean in the basement

William L. Griffin Graham Begg Suzanne Y. O′Reilly L. M. Natapov

Basement

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The evolution of lithospheric domains: A new framework to enhance mineral exploration targeting

Springer eBooks (2005)

Suzanne Y. O′Reilly Jon Hronsky William L. Griffin Graham Begg

10.1007/3-540-27946-6_11

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Citations (1)

Thermochemical structure and evolution of cratonic lithosphere in central and southern Africa

EarthArXiv (California Digital Library) (2021)

Juan Carlos Afonso Walid Mansour Suzanne Y. O′Reilly William L. Griffin Farshad Salajeghegh

The thermochemical structure of the subcontinental mantle holds information on its origin and evolution that can inform energy and mineral exploration strategies, natural hazard mitigation and evolutionary models of the Earth. However, imaging the fine-scale thermochemical structure of continental lithosphere remains a major challenge. Here we combine multiple land and satellite datasets via thermodynamically-constrained inversions to obtain a high-resolution thermochemical model of central and southern Africa. Results reveal diverse structures and compositions for cratons, indicating distinct evolutions and responses to geodynamic processes. While much of the Kaapvaal lithosphere retained its cratonic features, the western Angolan-Kasai shield and the Rehoboth block have lost their cratonic keels. The lithosphere of the Congo Craton has been affected by metasomatism, increasing its density and inducing its conspicuous low-topography, geoid and magnetic anomalies. Our results reconcile mantle structure with the causes and location of volcanism within and around the Tanzanian Craton, whereas the absence of volcanism towards the north is the result of local asthenospheric downwellings, not to a previously-proposed lithospheric root connecting with the Congo Craton. Our study offers improved integration of mantle structure, magmatism and the evolution and destruction of cratonic lithosphere and lays the groundwork for futurelithospheric evolutionary models and exploration frameworks for the Earth and otherterrestrial planets.

Mantle plume

10.31223/x5562s

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Citations (2)

Ductile and brittle deformation in the Cann Valley Granitoids, Victoria

Australian Journal of Earth Sciences (1987)

Graham Begg Jean‐Pierre Burg Christopher J.L. Wilson

Foliated portions of the Early Devonian Bega Batholith were developed in an apparent flattening field contemporaneous with their plutonic emplacement. Overprinting the foliated portions of the granites are a series of Early‐Middle Devonian ductile shear zones characterized by mylonitic rocks with dextral horizontal movement. The principal shortening during the ductile shear zone development has a trend of 140°. Brittle deformation, confined to narrow gouge and microbreccia zones, is superimposed on the features of ductile deformation. The brittle features represent deformation at higher crustal levels with the orientation of the principal shortening becoming almost north‐south.

Overprinting

Mylonite

Batholith

Devonian

Brittleness

Flattening

10.1080/08120098708729395

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Citations (19)

Paleoproterozoic gold events in the southern West African Craton: review and synopsis

Mineralium Deposita (2021)

Quentin Masurel Aurélien Eglinger Nicolas Thébaud Andrew Allibone Anne-Sylvie André-Mayer