Magnetotelluric image linked to surface geology across the Cape Fold Belt, South Africa
Magnetotelluric image linked to surface geology across the Cape Fold Belt, South Africa
复制标题
与南非开普褶皱带地表地质相关的大地电磁图像
DOI:
10.1111/j.1365-3121.2011.01054.x
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发表时间:
2012
期刊:
影响因子:
2.4
通讯作者:
de Wit
中科院分区:
文献类型:
--
作者:
Weckmann;Ritter;Tietze;de Wit
Terra Nova, 24, 207–212, 2012AbstractThe subsurface structure of the Cape Fold Belt (CFB) that traverses southern Africa remains largely unknown because it lacks deep‐penetrating, high‐resolution geophysics. This hampers studies from local‐scale exploration for important resources such as water, to continental‐scale modelling, such as Gondwana reconstructions. Our Magnetotelluric (MT) soundings across the CFB provide a high‐resolution crustal‐scale electrical conductivity image. Inversion models of these data correlate well with surface geology, and resolve deep resistive roots of the CFB’s regional Palaeozoic quartzite ridges (Swartberg and Outeniqua Mountains) and thin tectonic wedges of Proterozoic rocks of higher resistivity (Kango and Kaaimans Inliers), separated by 2–3 km of Cretaceous sediments in asymmetric intermontaine basins. One of these basins, the Oudtshoorn Basin, is flanked by a listric normal fault rooted in an upper crustal detachment zone, and is underlain by a massive conductivity anomaly that is likely to be a major saline water reservoir.
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DOI:
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2000
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1995
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1997
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2008
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发表时间:
2008
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