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Thickness of extrusive basalts dominating the magnetic structure along the ultraslow-spreading Mohns Ridge axis (71.8 degrees-73.7 degrees N)
Zhang, Tao1; Gao, Jinyao1; Xu, Min2; Shen, Zhongyan1; Wu, Zhaocai1
2018
Source PublicationTECTONOPHYSICS
ISSN0040-1951
Volume742Pages:1
AbstractThe equivalent magnetization (EM) and mantle Bouguer anomaly (MBA) were calculated along the ultraslowspreading Mohns Ridge axis in the Norwegian-Greenland Sea. The magnetic anomaly and the associated EM were compared with the bathymetry, MBA, seismically determined crustal structure and geochemical data at both the inter-segment scale ( > 60 km) and the infra-segment scale (20-60 km). At the inter-segment scale, the magnetic highs at the segment centers are independent of the MBA. Of the 13 segments, 9 with magnetic anomalies > 700 nT coincide with axial volcanic ridges identified from multibeam bathymetry maps, which suggests that the magnetic highs at the segment centers may be more associated with the extrusive lavas rather than the amount of magma supply. With few exceptions, the magnetic anomaly lows associated with MBA highs at the segment ends increase from south to north. This trend might be explained by thickened extrusive basalts and/or more serpentinized peridotites at the segment ends in the north. At the infra-segment scale, the most prominent features are the decreases in the magnetic anomalies and associated EMs from the segment centers to the ends. The infra-segment magnetic anomalies have positive and negative correlations with the bathymetry and MBA, respectively. The magnetic signal modeled by the seismically determined layer 2A with an assumed constant magnetization is remarkably consistent with the observed magnetic anomaly, which strongly suggests that the thickness of the extrusive basalts dominates the magnetic structure in each segment along the Mohns Ridge. In general, the thickness of the extrusive basalts dominates the magnetic structure along the Mohns Ridge, whereas the contributions from serpentinized peridotites may be significant at the segment ends and may produce long-wavelength magnetic variations. The magnetic data can be used as an indicator of the thickness of the extrusive basalts within segments along the ultraslow-spreading Mohns Ridge.
DepartmentMSG
KeywordMohns Ridge Segmentation Magnetization Mantle Bouguer anomaly Extrusive basalts Serpentinized peridotites
DOI10.1016/j.tecto.2018.05.009
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Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/17688
Collection中科院边缘海地质重点实验室
Affiliation1.State Ocean Adm, Inst Oceanog 2, Hangzhou 310012, Zhejiang, Peoples R China
2.State Ocean Adm, Key Lab Submarine Geosci, Hangzhou 310012, Zhejiang, Peoples R China
3.Chinese Acad Sci, Key Lab Ocean & Marginal Sea Geol, South China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Tao,Gao, Jinyao,Xu, Min,et al. Thickness of extrusive basalts dominating the magnetic structure along the ultraslow-spreading Mohns Ridge axis (71.8 degrees-73.7 degrees N)[J]. TECTONOPHYSICS,2018,742:1, 14.
APA Zhang, Tao,Gao, Jinyao,Xu, Min,Shen, Zhongyan,&Wu, Zhaocai.(2018).Thickness of extrusive basalts dominating the magnetic structure along the ultraslow-spreading Mohns Ridge axis (71.8 degrees-73.7 degrees N).TECTONOPHYSICS,742,1.
MLA Zhang, Tao,et al."Thickness of extrusive basalts dominating the magnetic structure along the ultraslow-spreading Mohns Ridge axis (71.8 degrees-73.7 degrees N)".TECTONOPHYSICS 742(2018):1.
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