Thickness of extrusive basalts dominating the magnetic structure along the ultraslow-spreading Mohns Ridge axis (71.8 degrees-73.7 degrees N)
文献类型：期刊论文
| 作者 | Shen, Zhongyan2; Gao, Jinyao2; Zhang, Tao2; Wu, Zhaocai2; Xu, Min3 |
| 刊名 | TECTONOPHYSICS
 |
| 出版日期 | 2018 |
| 卷号 | 742页码:1 |
| 关键词 | Mohns Ridge Segmentation Magnetization Mantle Bouguer anomaly Extrusive basalts Serpentinized peridotites |
| ISSN号 | 0040-1951 |
| DOI | 10.1016/j.tecto.2018.05.009 |
| 英文摘要 | The 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. |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/17688]  |
| 专题 | 南海海洋研究所_中科院边缘海地质重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Ocean & Marginal Sea Geol, South China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China 2.State Ocean Adm, Inst Oceanog 2, Hangzhou 310012, Zhejiang, Peoples R China 3.State Ocean Adm, Key Lab Submarine Geosci, Hangzhou 310012, Zhejiang, Peoples R China |
| 推荐引用方式 GB/T 7714 | Shen, Zhongyan,Gao, Jinyao,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)[J]. TECTONOPHYSICS,2018,742:1, 14. |
| APA | Shen, Zhongyan,Gao, Jinyao,Zhang, Tao,Wu, Zhaocai,&Xu, Min.(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 | Shen, Zhongyan,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. |
入库方式： OAI收割
来源：南海海洋研究所
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