Nature of Magnetic Anomalies in the Equatorial Ninetyeast Ridge

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Abstract

According to a set of geophysical methods, the equatorial Ninetyeast Ridge and neighboring areas of the Central (to the west) and Wharton (to the east) Basins have been studied. Detailed map of the magnetic anomalies (∆Ta) for this Ninetyeast Ridge segment were created for the first time due to generalization of magnetic data of 5 cruises. The mapped area of 136.6 thousand km2 is located near the Site 216 DSDP. For the first time, it was found that the linear magnetic anomalies C31r and C32n.1n do not terminate front the Ninetyeast Ridge, but continue here from the basins. The calculated interval spreading rate for the ridge is about 45 mm/year. In the Wharton Basin, the N-S Fracture Zone 90°E, along where linear magnetic anomalies ruptured and shifted, has been clarified. Magnetic modeling for the seamount on the eastern slope of the Ninetyeast Ridge allowed assuming that this volcanic structure has deep root. It could be formed as a result of repeated younger ("secondary") magmatism after the formation of the main volcanic massif of the ridge itself. Interpretation of magnetic survey data, heat flow measurements and earthquake mechanisms indicate the presence of modern tectonic activity within the studied section of the ridge.

About the authors

I. A. Veklich

Shirshov Institute of Oceanology, Russian Academy of Sciences

Email: veklich.ia@ocean.ru
Moscow, Russia

A. N. Ivanenko

Shirshov Institute of Oceanology, Russian Academy of Sciences

Moscow, Russia

O. V. Levchenko

Shirshov Institute of Oceanology, Russian Academy of Sciences

Moscow, Russia

O. V. Veselov

Institute of Marine Geology and Geophysics, Far East Branch of RAS

Yuzhno-Sakhalinsk, Russia

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