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Investigation of a marine magnetic polarity reversal boundary in cross section at the northern boundary of the Kane Megamullion, Mid-Atlantic Ridge, 23 degrees 40 ' N
Xu, Min; Tivey, M. A.; Xu, M (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou, Guangdong, Peoples R China.; Xu, M (reprint author), Woods Hole Oceanog Inst, Dept Marine Geol & Geophys, Woods Hole, MA 02543 USA.
2016
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
Volume121Issue:5Pages:3161-3176
AbstractNear-bottom magnetic field measurements made by the submersible Nautile during the 1992 Kanaut Expedition define the cross-sectional geometry of magnetic polarity reversal boundaries and the vertical variation of crustal magnetization in lower oceanic crust exposed along the Kane Transform Fault (TF) at the northern boundary of the Kane Megamullion (KMM). The KMM exposes lower crust and upper mantle rocks on a low-angle normal fault that was active between 3.3 Ma and 2.1 Ma. The geometry of the polarity boundaries is estimated from an inversion of the submarine magnetic data for crustal magnetization. In general, the polarity boundaries dip away from the ridge axis along the Kane TF scarp, with a west dipping angle of similar to 45 degrees in the shallow (< 1 km) crust and < 20 degrees in the deeper crust. The existence of the magnetic polarity boundaries (e.g., C2r.2r/C2An. 1n, similar to w2.581 Ma) indicates that the lower crustal gabbros and upper mantle serpentinized peridotites are able to record a coherent magnetic signal. Our results support the conclusion of Williams (2007) that the lower crust cools through the Curie temperature of magnetite to become magnetic, with the polarity boundaries representing both frozen isotherms and isochrons. We also test the effects of the rotation of this isotherm structure and/or footwall rotation and find that the magnetic polarity boundary geometry is not sensitive to these directional changes.
Department[Xu, Min] Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou, Guangdong, Peoples R China; [Xu, Min; Tivey, M. A.] Woods Hole Oceanog Inst, Dept Marine Geol & Geophys, Woods Hole, MA 02543 USA ; 边缘海地质
Subject AreaGeochemistry & Geophysics
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/15435
Collection中科院边缘海地质重点实验室
Corresponding AuthorXu, M (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou, Guangdong, Peoples R China.; Xu, M (reprint author), Woods Hole Oceanog Inst, Dept Marine Geol & Geophys, Woods Hole, MA 02543 USA.
Recommended Citation
GB/T 7714
Xu, Min,Tivey, M. A.,Xu, M ,et al. Investigation of a marine magnetic polarity reversal boundary in cross section at the northern boundary of the Kane Megamullion, Mid-Atlantic Ridge, 23 degrees 40 ' N[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2016,121(5):3161-3176.
APA Xu, Min,Tivey, M. A.,Xu, M ,&Xu, M .(2016).Investigation of a marine magnetic polarity reversal boundary in cross section at the northern boundary of the Kane Megamullion, Mid-Atlantic Ridge, 23 degrees 40 ' N.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,121(5),3161-3176.
MLA Xu, Min,et al."Investigation of a marine magnetic polarity reversal boundary in cross section at the northern boundary of the Kane Megamullion, Mid-Atlantic Ridge, 23 degrees 40 ' N".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 121.5(2016):3161-3176.
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