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

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    Li_et_al-2014-Geochemistry,_Geophysics,_Geosystems.pdf (5.114Mb)
    Date
    2014-12-27
    Author
    Li, Chun-Feng  Concept link
    Xu, Xing  Concept link
    Lin, Jian  Concept link
    Sun, Zhen  Concept link
    Zhu, Jian  Concept link
    Yao, Yongjian  Concept link
    Zhao, Xixi  Concept link
    Liu, Qingsong  Concept link
    Kulhanek, Denise K.  Concept link
    Wang, Jian  Concept link
    Song, Taoran  Concept link
    Zhao, Junfeng  Concept link
    Qiu, Ning  Concept link
    Guan, Yongxian  Concept link
    Zhou, Zhiyuan  Concept link
    Williams, Trevor  Concept link
    Bao, Rui  Concept link
    Briais, Anne  Concept link
    Brown, Elizabeth A.  Concept link
    Chen, Yifeng  Concept link
    Clift, Peter D.  Concept link
    Colwell, Frederick S.  Concept link
    Dadd, Kelsie A.  Concept link
    Ding, Weiwei  Concept link
    Almeida, Ivan Hernandez  Concept link
    Huang, Xiao-Long  Concept link
    Hyun, Sangmin  Concept link
    Jiang, Tao  Concept link
    Koppers, Anthony A. P.  Concept link
    Li, Qianyu  Concept link
    Liu, Chuanlian  Concept link
    Liu, Zhifei  Concept link
    Nagai, Renata H.  Concept link
    Peleo-Alampay, Alyssa  Concept link
    Su, Xin  Concept link
    Tejada, Maria Luisa G.  Concept link
    Trinh, Hai Son  Concept link
    Yeh, Yi-Ching  Concept link
    Zhang, Chuanlun  Concept link
    Zhang, Fan  Concept link
    Zhang, Guo-Liang  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/7180
    As published
    https://doi.org/10.1002/2014GC005567
    DOI
    10.1002/2014GC005567
    Keyword
     Deep tow magnetic survey; Magnetic anomaly; Crustal evolution; Modeling; International Ocean Discovery Program Expedition 349; South China Sea tectonics 
    Abstract
    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 ∼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 ∼23.6 to ∼21.5 Ma. The terminal age of seafloor spreading is ∼15 Ma in the East Subbasin and ∼16 Ma in the Southwest Subbasin. The full spreading rate in the East Subbasin varied largely from ∼20 to ∼80 km/Myr, but mostly decreased with time except for the period between ∼26.0 Ma and the ridge jump (∼23.6 Ma), within which the rate was the fastest at ∼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.
    Description
    Author Posting. © American Geophysical Union, 2014. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry, Geophysics, Geosystems 15 (2014): 4958–4983, doi:10.1002/2014GC005567.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Geochemistry, Geophysics, Geosystems 15 (2014): 4958–4983
     

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