IOCAS-IR  > 海洋地质与环境重点实验室
Ages and magnetic structures of the South China Sea constrained by deep tow magnetic surveys and IODP Expedition 349
Li, Chun-Feng1; Xu, Xing2; Lin, Jian3; Sun, Zhen4; Zhu, Jian3; Yao, Yongjian2; Zhao, Xixi1; Liu, Qingsong5; Kulhanek, Denise K.6; Wang, Jian1; Song, Taoran1; Zhao, Junfeng4; Qiu, Ning4; Guan, Yongxian2; Zhou, Zhiyuan1; Williams, Trevor7; Bao, Rui8; Briais, Anne9; Brown, Elizabeth A.10; Chen, Yifeng11; Clift, Peter D.12; Colwell, Frederick S.13; Dadd, Kelsie A.14; Ding, Weiwei15; Almeida, Ivan Hernandez16; Huang, Xiao-Long17; Hyun, Sangmin18; Jiang, Tao19; Koppers, Anthony A. P.13; Li, Qianyu20; Liu, Chuanlian20; Liu, Zhifei1; Nagai, Renata H.21; Peleo-Alampay, Alyssa22; Su, Xin23; Tejada, Maria Luisa G.24; Hai Son Trinh25; Yeh, Yi-Ching26; Zhang, Chuanlun20; Zhang, Fan3; Zhang, Guo-Liang27; Li, CF (reprint author), Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China.
2014-12-01
Source PublicationGEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
Volume15Issue:12Pages:4958-4983
SubtypeArticle
AbstractCombined 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.
KeywordDeep Tow Magnetic Survey Magnetic Anomaly Crustal Evolution Modeling International Ocean Discovery Program Expedition 349 South China Sea Tectonics
Subject AreaGeochemistry & Geophysics
DOI10.1002/2014GC005567
Indexed BySCI
Language英语
WOS IDWOS:000348061300021
Citation statistics
Cited Times:148[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/23792
Collection海洋地质与环境重点实验室
Corresponding AuthorLi, CF (reprint author), Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China.
Affiliation1.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
11.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Marginal Sea Geol, Guangzhou, Guangdong, Peoples R China
12.Louisiana State Univ, Dept Geol & Geophys, Baton Rouge, LA 70803 USA
13.Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA
14.Macquarie Univ, Dept Earth & Planetary Sci, Sydney, NSW 2109, Australia
15.State Ocean Adm, Inst Oceanog 2, Key Lab Submarine Geosci, Hangzhou, Zhejiang, Peoples R China
16.Univ Bern, Oeschger Ctr Climate Change Res, Inst Geog, Bern, Switzerland
17.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Guangdong, Peoples R China
18.Korea Inst Ocean Sci & Technol, Marine Geol & Geophys Div, Ansan, South Korea
19.China Univ Geosci, Dept Marine Sci & Engn, Fac Earth Resources, Wuhan 430074, Peoples R China
20.Tongji Univ, Sch Ocean & Earth Sci, Shanghai 200092, Peoples R China
21.Univ Sao Paulo, Dept Phys Chem & Geol Oceanog, Sao Paulo, Brazil
22.Univ Philippines, Natl Inst Geol Sci, Quezon City 1101, Philippines
23.China Univ Geosci, Sch Marine Geosci, Beijing, Peoples R China
24.Japan Agcy Marine Earth Sci & Technol, Yokosuka, Kanagawa, Japan
25.Minist Nat Resources & Environm, Dept Sci & Technol, Hanoi, Vietnam
26.Taiwan Ocean Res Inst, Kaohsiung, Taiwan
27.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao, Peoples R China
Recommended Citation
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.,...&Li, CF .(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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