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| Titel |
Magnetic signature of large exhumed mantle domains of the Southwest Indian Ridge – results from a deep-tow geophysical survey over 0 to 11 Ma old seafloor |
| VerfasserIn |
A. Bronner, D. Sauter, M. Munschy, J. Carlut, R. Searle, M. Cannat, G. Manatschal |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 5, no. 1 ; Nr. 5, no. 1 (2014-05-19), S.339-354 |
| Datensatznummer |
250115272
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| Publikation (Nr.) |
 copernicus.org/se-5-339-2014.pdf |
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| Zusammenfassung |
| We investigate the magnetic signature of ultramafic seafloor in the
eastern part of the Southwest Indian Ridge (SWIR). There, detachment
faulting, continuous over 11 Myr, exhumed large areas of mantle-derived
rocks. These exhumed mantle domains occur in the form of a smooth rounded
topography with broad ridges locally covered by a thin highly discontinuous
volcanic carapace. We present high-resolution data combining deep-tow
magnetics, side-scan sonar images and dredged samples collected within two
exhumed mantle domains between 62° E and 65° E. We show
that, despite an ultra-slow spreading rate, volcanic areas within robust
magmatic segments are characterized by well-defined seafloor spreading
anomalies. By contrast, the exhumed mantle domains, including a few thin
volcanic patches, reveal a weak and highly variable magnetic pattern. The
analysis of the magnetic properties of the dredged samples and careful
comparison between the nature of the seafloor, the deep-tow magnetic
anomalies and the seafloor equivalent magnetization suggest that the
serpentinized peridotites do not carry a sufficiently stable remanent
magnetization to produce seafloor spreading magnetic anomalies in exhumed
mantle domains. |
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