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Depths to the magnetic layer bottom in the South China Sea area and their tectonic implications
Li, CF; Shi, XB; Zhou, ZY; Li, JB; Geng, JH; Chen, B; cfl@tongji.edu.cn
2010
发表期刊GEOPHYSICAL JOURNAL INTERNATIONAL
ISSN0956-540X
卷号182期号:3页码:1229-1247
摘要P>The depths to the magnetic layer bottom (Z(b)) in the South China Sea (SCS) area are estimated by computing radially averaged amplitude spectra of total field magnetic anomalies. We test different sizes of moving windows in which the spectra are calculated to better understand how window sizes affect the depth estimations. Apart from lowering the resolutions of estimated Z(b), larger windows do not necessarily incur presumable increases in Z(b) in the SCS area. Although the centroid method is taken as our primary technique for estimating Z(b), for cross check, the spectral peak and the non-linear inversion methods are also applied to those windows where spectral peaks do appear. In a single window we may find discrepancy in Z(b) estimated from different techniques, but for all windows showing spectral peaks, the estimated Z(b) from one technique are grossly correlated with those from another. Our results show that most parts of the central SCS ocean basin and the northern continent-ocean transition (COT) zone have significantly smaller Z(b) than the surrounding continental blocks. In the surrounding continental regions Z(b) are averaged at about 34 km, a depth close to the Moho depth. The average Z(b) is about 22 km in the central basin, but this value is much larger than the Moho depth, signifying that the uppermost 10 km or so of the mantle beneath the central basin is also magnetized. The strong faulting and recent magmatism within the COT zone can account for the small Z(b) near the northern continental margin. The estimated Z(b) are also found very correlative to surface heat flow. This observation verifies dominant contributions to surface heat flow from incoming mantle heat flow due to thermal conduction. The positive correlations observed among Z(b) from different techniques as well as the good correlation between surface heat flow and Z(b) support the reasoning that our estimated Z(b) are within an acceptable range of accuracy.
部门归属[Li, Chun-Feng; Zhou, Zuyi; Geng, Jianhua; Chen, Bing] Tongji Univ, State Lab Marine Geol, Shanghai 200092, Peoples R China; [Shi, Xiaobin] Chinese Acad Sci, S China Sea Inst Oceanol, Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Li, Jiabiao] State Ocean Adm, Inst Oceanog 2, Hangzhou 310012, Zhejiang, Peoples R China
关键词Fourier Analysis Inverse Theory Magnetic Anomalies: Modelling And Interpretation Marine Magnetics And palaeoMagnetics Heat Flow Continental Margins: Divergent
学科领域Geochemistry & Geophysics
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收录类别sci
资助项目海洋地质
WOS记录号WOS:000280997700010
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被引频次:43[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/4314
专题中科院边缘海地质重点实验室
通讯作者cfl@tongji.edu.cn
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Li, CF,Shi, XB,Zhou, ZY,et al. Depths to the magnetic layer bottom in the South China Sea area and their tectonic implications[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2010,182(3):1229-1247.
APA Li, CF.,Shi, XB.,Zhou, ZY.,Li, JB.,Geng, JH.,...&cfl@tongji.edu.cn.(2010).Depths to the magnetic layer bottom in the South China Sea area and their tectonic implications.GEOPHYSICAL JOURNAL INTERNATIONAL,182(3),1229-1247.
MLA Li, CF,et al."Depths to the magnetic layer bottom in the South China Sea area and their tectonic implications".GEOPHYSICAL JOURNAL INTERNATIONAL 182.3(2010):1229-1247.
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