The electrical conductivity of the Andean crust in northern Chile and southern Bolivia as inf erred from magnetotelluric measurements
Item
Title (Dublin Core)
en-US
The electrical conductivity of the Andean crust in northern Chile and southern Bolivia as inf erred from magnetotelluric measurements
Description (Dublin Core)
en-US
The subducted Nasca plate produces anomalies of spectacular low electrical resistivity beneath the Andean knee. This is the result of two magnetotelluric field campaigns in 1982. The measurements were carried out on a profile from the Pacific coast to the Eastern Cordillera crossing northern Chile and southern Bolivia. Several anomalies may be distinguished. The strongest anomaly has been detected beneath the Pre- and West-Cordillera, with resistivities around 0.5 Ωm at depths greater than 5-10 km, strike direction roughly parallel to the main crest of the High-Cordillera. But also, the Altiplano is underlain – at a depth of 40-50 km – by very low-resistive material. In agreement with other geophysical and geological observations, we interpret these low resistivities as being due to the partially melted state. Further arguments identify the Pre-Cordillera anomaly, probably, with a plutonite which is still "alive", and the highly-conductive material 40 km beneath the Altiplano with the source of andesitic magma. A crucial point in this study is the distinction between the E- and B-polarization of the apparent resistivities. We distinguished both polarizations by the direction of the induction arrows and by the lateral continuity of the apparent resistivity.
ARK: https://n2t.net/ark:/88439/y029284
Permalink: https://geophysicsjournal.com/article/242
ARK: https://n2t.net/ark:/88439/y029284
Permalink: https://geophysicsjournal.com/article/242
Creator (Dublin Core)
Schwarz, G.
Haak, V.
Martinez, E.
Bannister, J.
Subject (Dublin Core)
en-US
Electrical conductivity studies
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Central Andes Magnetotellurics
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Crustal electrical resistivity anomaly
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Partial melting
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Temperature
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Subduction processes
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Plutonites
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Andesitic volcanism
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Separation of E- and B-polarization
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Solid Earth
Publisher (Dublin Core)
en-US
Journal of Geophysics
Date (Dublin Core)
1984-08-30
Type (Dublin Core)
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
en-US
Peer-reviewed Article
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
https://journal.geophysicsjournal.com/JofG/article/view/242
Source (Dublin Core)
en-US
Journal of Geophysics; Vol 55 No 1 (1984): Journal of Geophysics; 169-178
2643-2986
2643-9271
Language (Dublin Core)
eng
Relation (Dublin Core)
https://journal.geophysicsjournal.com/JofG/article/view/242/202