The thermochemical structure of central and southern Africa from multi-observable probabilistic inversion

Walid Ben Mansour, Juan Carlos Afonso, Andrew Andrew , Nicole Januszczak

Research output: Contribution to journalMeeting abstractResearch

Abstract

Central and southern Africa is a geologically intriguing region made up of several cratonic blocks separated by metamorphic belts or sedimentary basins and showing exceptional geophysical and geodynamic features (e.g. Bangui magnetic anomaly in central Africa, Beattie magnetic anomaly in south Africa, uplift of the Angolan
passive margin and South Africa, shortening of the crust in East Africa).

Knowledge of the present-day thermochemical structure (temperature and major-element composition) of the lithosphere and sub-lithospheric upper mantle is key to understanding the relationships between internal Earth dynamics, surface observables (e.g. topography, gravity) and the location of mineral and energy resources
(e.g. diamondiferous kimberlites) in this region. Here we apply a 3D multi-observable inversion method based on a probabilistic (Bayesian) formalism using high-quality geophysical, geochemical and geological datasets. This framework allows us to move beyond classic inversion schemes and jointly invert multiple seismic data (e.g. surface wave, receiver functions, etc) and non-seismic data (geothermal, topography, potential fields, etc) to retrieve estimates of the thermal, magnetic and lithological structures beneath Central and southern Africa at a resolution of 2°x2°.

In this presentation, we will discuss the benefits and limitations of our new model and a number of robust features that carry important implications for supporting or disproving current evolutionary models for this region.
LanguageEnglish
Article numberEGU2019-11859
Number of pages1
JournalGeophysical Research Abstracts
Volume21
Publication statusPublished - 2019
EventEGU General Assembly 2019 - Vienna, Austria
Duration: 7 Apr 201912 Apr 2019
https://www.egu2019.eu

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magnetic anomaly
topography
potential field
energy resource
mineral resource
sedimentary basin
surface wave
geodynamics
upper mantle
lithosphere
seismic data
uplift
gravity
crust
inversion
Southern Africa
Central Africa
temperature
Africa
East Africa

Bibliographical note

Copyright the Author(s) 2019. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Cite this

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title = "The thermochemical structure of central and southern Africa from multi-observable probabilistic inversion",
abstract = "Central and southern Africa is a geologically intriguing region made up of several cratonic blocks separated by metamorphic belts or sedimentary basins and showing exceptional geophysical and geodynamic features (e.g. Bangui magnetic anomaly in central Africa, Beattie magnetic anomaly in south Africa, uplift of the Angolanpassive margin and South Africa, shortening of the crust in East Africa). Knowledge of the present-day thermochemical structure (temperature and major-element composition) of the lithosphere and sub-lithospheric upper mantle is key to understanding the relationships between internal Earth dynamics, surface observables (e.g. topography, gravity) and the location of mineral and energy resources(e.g. diamondiferous kimberlites) in this region. Here we apply a 3D multi-observable inversion method based on a probabilistic (Bayesian) formalism using high-quality geophysical, geochemical and geological datasets. This framework allows us to move beyond classic inversion schemes and jointly invert multiple seismic data (e.g. surface wave, receiver functions, etc) and non-seismic data (geothermal, topography, potential fields, etc) to retrieve estimates of the thermal, magnetic and lithological structures beneath Central and southern Africa at a resolution of 2°x2°. In this presentation, we will discuss the benefits and limitations of our new model and a number of robust features that carry important implications for supporting or disproving current evolutionary models for this region.",
author = "{Ben Mansour}, Walid and Afonso, {Juan Carlos} and Andrew Andrew and Nicole Januszczak",
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year = "2019",
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The thermochemical structure of central and southern Africa from multi-observable probabilistic inversion. / Ben Mansour, Walid; Afonso, Juan Carlos; Andrew , Andrew ; Januszczak , Nicole .

In: Geophysical Research Abstracts, Vol. 21, EGU2019-11859, 2019.

Research output: Contribution to journalMeeting abstractResearch

TY - JOUR

T1 - The thermochemical structure of central and southern Africa from multi-observable probabilistic inversion

AU - Ben Mansour, Walid

AU - Afonso, Juan Carlos

AU - Andrew , Andrew

AU - Januszczak , Nicole

N1 - Copyright the Author(s) 2019. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

PY - 2019

Y1 - 2019

N2 - Central and southern Africa is a geologically intriguing region made up of several cratonic blocks separated by metamorphic belts or sedimentary basins and showing exceptional geophysical and geodynamic features (e.g. Bangui magnetic anomaly in central Africa, Beattie magnetic anomaly in south Africa, uplift of the Angolanpassive margin and South Africa, shortening of the crust in East Africa). Knowledge of the present-day thermochemical structure (temperature and major-element composition) of the lithosphere and sub-lithospheric upper mantle is key to understanding the relationships between internal Earth dynamics, surface observables (e.g. topography, gravity) and the location of mineral and energy resources(e.g. diamondiferous kimberlites) in this region. Here we apply a 3D multi-observable inversion method based on a probabilistic (Bayesian) formalism using high-quality geophysical, geochemical and geological datasets. This framework allows us to move beyond classic inversion schemes and jointly invert multiple seismic data (e.g. surface wave, receiver functions, etc) and non-seismic data (geothermal, topography, potential fields, etc) to retrieve estimates of the thermal, magnetic and lithological structures beneath Central and southern Africa at a resolution of 2°x2°. In this presentation, we will discuss the benefits and limitations of our new model and a number of robust features that carry important implications for supporting or disproving current evolutionary models for this region.

AB - Central and southern Africa is a geologically intriguing region made up of several cratonic blocks separated by metamorphic belts or sedimentary basins and showing exceptional geophysical and geodynamic features (e.g. Bangui magnetic anomaly in central Africa, Beattie magnetic anomaly in south Africa, uplift of the Angolanpassive margin and South Africa, shortening of the crust in East Africa). Knowledge of the present-day thermochemical structure (temperature and major-element composition) of the lithosphere and sub-lithospheric upper mantle is key to understanding the relationships between internal Earth dynamics, surface observables (e.g. topography, gravity) and the location of mineral and energy resources(e.g. diamondiferous kimberlites) in this region. Here we apply a 3D multi-observable inversion method based on a probabilistic (Bayesian) formalism using high-quality geophysical, geochemical and geological datasets. This framework allows us to move beyond classic inversion schemes and jointly invert multiple seismic data (e.g. surface wave, receiver functions, etc) and non-seismic data (geothermal, topography, potential fields, etc) to retrieve estimates of the thermal, magnetic and lithological structures beneath Central and southern Africa at a resolution of 2°x2°. In this presentation, we will discuss the benefits and limitations of our new model and a number of robust features that carry important implications for supporting or disproving current evolutionary models for this region.

UR - https://meetingorganizer.copernicus.org/EGU2019/posters/32242

M3 - Meeting abstract

VL - 21

JO - Geophysical Research Abstracts

T2 - Geophysical Research Abstracts

JF - Geophysical Research Abstracts

SN - 1029-7006

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