2014; 47(4): 395-404

Published online August 31, 2014

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

Magnetic Characteristics of TA19-1 and TA19-2 Seamounts in the Lau Basin, the South Western Pacific

Chang Hwan Kim*

Dokdo Research Center, East Sea Research Institute, Korea Institute Of Ocean Science & Technology, Gyeongsangbuk-do 767-813, Korea

Received: April 7, 2014; Revised: May 12, 2014; Accepted: May 23, 2014

Abstract

We conducted the geophysical survey of possible hydrothermal vent sites at 2009, in the Lau Basin, the south western Pacific and analyzed the magnetic characteristics of TA19-1 and TA19-2 seamounts. TA19-1 is a coneshaped seamount with a caldera summit. TA19-2 seamount is bigger and shows more complicated topography than TA19-1 seamount. TA19-2 has a large caldera, a summit in the west side of the caldera and several crests. Simple dipole anomalies with a high over the north and a low over the south occur in TA19-1 seamount. High magnetic anomalies are located in the northern flank and the summit of TA19-2 seamount and low anomalies around the summit and the caldera. The results of bathymetry and magnetic data suggest that TA19-2 seamount might have more complicated magmatic process than TA19-1. Low magnetization zones are located over the summit, the calderas and the caldera rims. The magnetization lows indicate that submarine hydrothermal vents, along faults and fracture zones, could have caused an alteration of magnetic minerals. The magnetization highs over the summit and the calderas might have been related with later magmatisms like volcanic sills, intrusions.

Keywords hydrothermal vent, seamount, magnetic characteristic, caldera, magnetization

Article

2014; 47(4): 395-404

Published online August 31, 2014

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

Magnetic Characteristics of TA19-1 and TA19-2 Seamounts in the Lau Basin, the South Western Pacific

Chang Hwan Kim*

Dokdo Research Center, East Sea Research Institute, Korea Institute Of Ocean Science & Technology, Gyeongsangbuk-do 767-813, Korea

Received: April 7, 2014; Revised: May 12, 2014; Accepted: May 23, 2014

Abstract

We conducted the geophysical survey of possible hydrothermal vent sites at 2009, in the Lau Basin, the south western Pacific and analyzed the magnetic characteristics of TA19-1 and TA19-2 seamounts. TA19-1 is a coneshaped seamount with a caldera summit. TA19-2 seamount is bigger and shows more complicated topography than TA19-1 seamount. TA19-2 has a large caldera, a summit in the west side of the caldera and several crests. Simple dipole anomalies with a high over the north and a low over the south occur in TA19-1 seamount. High magnetic anomalies are located in the northern flank and the summit of TA19-2 seamount and low anomalies around the summit and the caldera. The results of bathymetry and magnetic data suggest that TA19-2 seamount might have more complicated magmatic process than TA19-1. Low magnetization zones are located over the summit, the calderas and the caldera rims. The magnetization lows indicate that submarine hydrothermal vents, along faults and fracture zones, could have caused an alteration of magnetic minerals. The magnetization highs over the summit and the calderas might have been related with later magmatisms like volcanic sills, intrusions.

Keywords hydrothermal vent, seamount, magnetic characteristic, caldera, magnetization

    KSEEG
    Jun 30, 2024 Vol.57 No.3, pp. 281~352

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