Thermal perturbations beneath the incipient Okavango Rift Zone, northwest Botswana

Autor:	Kevin L. Mickus, Mohamed G. Abdelsalam, Elisha Shemang, Eliot A. Atekwana, Khumo Leseane, Estella A. Atekwana
Rok vydání:	2015
Předmět:	Rift Proterozoic Crust Mantle (geology) Geophysics Space and Planetary Science Geochemistry and Petrology Lithosphere Earth and Planetary Sciences (miscellaneous) Rift zone Shear zone Petrology Geomorphology Geology Aeromagnetic survey
Zdroj:	Journal of Geophysical Research: Solid Earth. 120:1210-1228
ISSN:	2169-9356 2169-9313
DOI:	10.1002/2014jb011029
Popis:	We used aeromagnetic and gravity data to investigate the thermal structure beneath the incipient Okavango Rift Zone (ORZ) in northwestern Botswana in order to understand its role in strain localization during rift initiation. We used three-dimensional (3-D) inversion of aeromagnetic data to estimate the Curie Point Depth (CPD) and heat flow under the rift and surrounding basement. We also used two-dimensional (2-D) power-density spectrum analysis of gravity data to estimate the Moho depth. Our results reveal shallow CPD values (8–15 km) and high heat flow (60–90 mW m−2) beneath a ~60 km wide NE-trending zone coincident with major rift-related border faults and the boundary between Proterozoic orogenic belts. This is accompanied by thin crust (
Databáze:	OpenAIRE
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