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 |
DOI | 10.1002/2014GC005567 |
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/132A11/85461] |
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. |
入库方式: OAI收割
来源:地质与地球物理研究所
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