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Ages and magnetic structures of the South China Sea constrained by deep tow magnetic surveys and IODP Expedition 349

文献类型：期刊论文

作者Li, Chun-Feng1; Xu, Xing2; Lin, Jian3; Sun, Zhen4; Zhu, Jian3; Yao, Yongjian2; Zhao, Xixi1; Liu, Qingsong5; Kulhanek, Denise K.6; Wang, Jian1
刊名GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
出版日期2014-12-01
卷号15期号:12页码:4958-4983
ISSN号1525-2027
关键词deep tow magnetic survey magnetic anomaly crustal evolution modeling International Ocean Discovery Program Expedition 349 South China Sea tectonics
DOI10.1002/2014GC005567
文献子类Article
英文摘要Combined analyses of deep tow magnetic anomalies and International Ocean Discovery Program Expedition 349 cores show that initial seafloor spreading started around 33 Ma in the northeastern South China Sea (SCS), but varied slightly by 1-2 Myr along the northern continent-ocean boundary (COB). A southward ridge jump of approximate to 20 km occurred around 23.6 Ma in the East Subbasin; this timing also slightly varied along the ridge and was coeval to the onset of seafloor spreading in the Southwest Subbasin, which propagated for about 400 km southwestward from approximate to 23.6 to approximate to 21.5 Ma. The terminal age of seafloor spreading is approximate to 15 Ma in the East Subbasin and approximate to 16 Ma in the Southwest Subbasin. The full spreading rate in the East Subbasin varied largely from approximate to 20 to approximate to 80 km/Myr, but mostly decreased with time except for the period between approximate to 26.0 Ma and the ridge jump (approximate to 23.6 Ma), within which the rate was the fastest at approximate to 70 km/Myr on average. The spreading rates are not correlated, in most cases, to magnetic anomaly amplitudes that reflect basement magnetization contrasts. Shipboard magnetic measurements reveal at least one magnetic reversal in the top 100 m of basaltic layers, in addition to large vertical intensity variations. These complexities are caused by late-stage lava flows that are magnetized in a different polarity from the primary basaltic layer emplaced during the main phase of crustal accretion. Deep tow magnetic modeling also reveals this smearing in basement magnetizations by incorporating a contamination coefficient of 0.5, which partly alleviates the problem of assuming a magnetic blocking model of constant thickness and uniform magnetization. The primary contribution to magnetic anomalies of the SCS is not in the top 100 m of the igneous basement.
WOS关键词FLOOR SPREADING ANOMALIES ; EAST PACIFIC RISE ; TECTONIC IMPLICATIONS ; GEOMAGNETIC PALEOINTENSITY ; BOTTOM ; RIDGE ; FIELD ; BATHYMETRY ; PROFILES ; MODEL
WOS研究方向Geochemistry & Geophysics
语种英语
出版者AMER GEOPHYSICAL UNION
WOS记录号WOS:000348061300021
资助机构National Science Foundation of China(91028007 ; National Science Foundation of China(91028007 ; Program for New Century Excellent Talents in University ; Program for New Century Excellent Talents in University ; Research Fund for the Doctoral Program of Higher Education of China(20100072110036) ; Research Fund for the Doctoral Program of Higher Education of China(20100072110036) ; 91428309) ; 91428309) ; National Science Foundation of China(91028007 ; National Science Foundation of China(91028007 ; Program for New Century Excellent Talents in University ; Program for New Century Excellent Talents in University ; Research Fund for the Doctoral Program of Higher Education of China(20100072110036) ; Research Fund for the Doctoral Program of Higher Education of China(20100072110036) ; 91428309) ; 91428309) ; National Science Foundation of China(91028007 ; National Science Foundation of China(91028007 ; Program for New Century Excellent Talents in University ; Program for New Century Excellent Talents in University ; Research Fund for the Doctoral Program of Higher Education of China(20100072110036) ; Research Fund for the Doctoral Program of Higher Education of China(20100072110036) ; 91428309) ; 91428309) ; National Science Foundation of China(91028007 ; National Science Foundation of China(91028007 ; Program for New Century Excellent Talents in University ; Program for New Century Excellent Talents in University ; Research Fund for the Doctoral Program of Higher Education of China(20100072110036) ; Research Fund for the Doctoral Program of Higher Education of China(20100072110036) ; 91428309) ; 91428309)
源URL[http://ir.iggcas.ac.cn/handle/132A11/85460]  
专题中国科学院地质与地球物理研究所
通讯作者Li, Chun-Feng
作者单位1.Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China
2.Guangzhou Marine Geol Survey, Guangzhou, Guangdong, Peoples R China
3.Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA 02543 USA
4.Chinese Acad Sci, South China Sea Inst Oceanol, Guangzhou, Guangdong, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
6.Texas A&M Univ, Int Ocean Discovery Program, College Stn, TX USA
7.Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY USA
8.Swiss Fed Inst Technol, Geolog Inst, Zurich, Switzerland
9.Univ Toulouse, CNRS, Geosci Environm Toulouse, Toulouse, France
10.Univ S Florida, Coll Marine Sci, St Petersburg, FL 33701 USA
推荐引用方式
GB/T 7714		 Li, Chun-Feng,Xu, Xing,Lin, Jian,et al. Ages and magnetic structures of the South China Sea constrained by deep tow magnetic surveys and IODP Expedition 349[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2014,15(12):4958-4983.
APA Li, Chun-Feng.,Xu, Xing.,Lin, Jian.,Sun, Zhen.,Zhu, Jian.,...&Zhang, Guo-Liang.(2014).Ages and magnetic structures of the South China Sea constrained by deep tow magnetic surveys and IODP Expedition 349.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,15(12),4958-4983.
MLA Li, Chun-Feng,et al."Ages and magnetic structures of the South China Sea constrained by deep tow magnetic surveys and IODP Expedition 349".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 15.12(2014):4958-4983.

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来源：地质与地球物理研究所

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