라우분지 FRSC(Fonualei Rift and Spreading Center)에서의 심해견인자력탐사 연구

Title
라우분지 FRSC(Fonualei Rift and Spreading Center)에서의 심해견인자력탐사 연구
Alternative Title
A Deep-tow magnetic survey of the FRSC(Fonualei Rift and Spreading Center) on Lau basin
Author(s)
곽준영; 김창환; 박찬홍; 고영탁; 황종선; 유상훈; 민경덕
KIOST Author(s)
Ko, Youngtak(고영탁)
Publication Year
2006-07-26
Abstract
A deep-tow magnetic survey was carried out over the mound of FRSC(Fonualei Rift and Spreading Center, 16? 22'S, 174? 35'W) located on the Lau basin by the R/V Onnuri 05'KODOS-03 Cruise. The FRSC comprises the spreading centers extending south of the MTJ (Mangatolu Triple Junction, also known as the Kings Triple Junction). The MTJ has reoriented during the Brunhes Chron. South of the MTJ, the positive Brunhes and surrounding negative Matuyama anomalies can be recognized. Earthquakes data of the FRSC show normal faulting consistent with active rifting(Zellmer et al, 2001). \\\\\\\\\\\\\\\\Generally, low magnetization at crust is strongly correlated with active hydrothermal vent field. The acidic and corrosive fluids that constitute marine hydrothermal vent systems can quickly alter or replace the iron-rich magnetic minerals, which reduce the magnetic remanence of the crustal rocks, in some cases to zero. \\\\\\\\\\\\\\\\Deep-tow magnetic field data were collected along axis track from south to north by using high sensitivity total field proton magnetometer which is towed 300~500m above the seafloor. The data were first merged with the ship navigation and upward continued to a level plane(-1.5km) using the Guspi(1987) method. The upward continued magnetic field was inverted for crustal magnetization using Parker(1974) inversion approach, which takes bathymetry into account assuming a constant layer thickness and then sufficient annihilator is added to magnetization solution to balance the positive and reverse polarity amplitudes. In this study, all inversions assume a 500m source thickness. \\\\\\\\\\\\\\\\The peaks in the crustal magnetization profile were found along track line. The peak which located over the mound of FRSC with low amplitude(1.5A/m) is estimated the effect of hydrothermal vent. However, it is necessary to compare and analyze with other geophysical studies because the low magnetization can be occurred by mass wasting or normal fault.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/30930
Bibliographic Citation
2006 Western Pacific Geophysics Meeting, pp.99, 2006
Publisher
American Geophysical Union
Type
Conference
Language
English
Publisher
American Geophysical Union
Related Researcher
Research Interests

marine geophysics,deep-sea minerals,해양지구물리,심해저광물자원

Files in This Item:
There are no files associated with this item.

qrcode

Items in ScienceWatch@KIOST are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse