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Titolo:
Geophysical evidence for late stage magmatism at the central Ninetyeast Ridge, Eastern Indian Ocean
Autore:
Kopf, A; Klaeschen, D; Weinrebe, W; Flueh, ER; Grevemeyer, I;
Indirizzi:
Univ Kiel, GEOMAR, Forschungszentrum Marine Geowissensch, D-24148 Kiel, Germany Univ Kiel Kiel Germany D-24148 arine Geowissensch, D-24148 Kiel, Germany
Titolo Testata:
MARINE GEOPHYSICAL RESEARCHES
fascicolo: 3, volume: 22, anno: 2001,
pagine: 225 - 234
SICI:
0025-3235(2001)22:3<225:GEFLSM>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
CONSTRAINTS; HOTSPOT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Kopf, A Univ Kiel, GEOMAR, Forschungszentrum Marine Geowissensch, Wischhofstr 1-3,D-24148 Kiel, Germany Univ Kiel Wischhofstr 1-3 Kiel Germany D-24148 4148 Kiel, Germany
Citazione:
A. Kopf et al., "Geophysical evidence for late stage magmatism at the central Ninetyeast Ridge, Eastern Indian Ocean", MAR GEOPHYS, 22(3), 2001, pp. 225-234

Abstract

The Ninetyeast Ridge is a well-studied hot spot trail in the Indian Ocean. A recent geophysical survey in its central portion near 17 degrees S included Hydrosweep bathymetric mapping, Parasound echosounder profiles, and high resolution seismic reflection data. These data reveal a number of small cones of a few hundreds of meters in diameter and up to 200 m height. Seismic evidence exists regarding a magmatic origin of these features. Different events of basaltic flow and tuff deposition intercalated with hemipelagic oozes of Eocene to present age, as being known from nearby drilling, allow dating of these latest stages of volcanic activity. An activity of at least 6 Ma longer than termination of the dominant constructional phase of the ridge can be demonstrated. These eruptions occur at shallow water depth, and seem to be related to tectonic lineaments in the area. Transtensional stresses together with a more durable magmatic source beneath this part of the ridge allow magma to ascend along pull-apart structures. The age discrepancyfound calls for special attention when trying to reconstruct global plate motions.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/04/20 alle ore 01:44:13