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

Identifieur interne : 003E60 ( Main/Exploration ); précédent : 003E59; suivant : 003E61

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

Auteurs : Chun-Feng Li [République populaire de Chine] ; Xing Xu [République populaire de Chine] ; Jian Lin [États-Unis] ; Zhen Sun [République populaire de Chine] ; Jian Zhu [États-Unis] ; Yongjian Yao [République populaire de Chine] ; Xixi Zhao [République populaire de Chine] ; Qingsong Liu [République populaire de Chine] ; Denise K. Kulhanek [États-Unis] ; Jian Wang [République populaire de Chine] ; Taoran Song [République populaire de Chine] ; Junfeng Zhao [République populaire de Chine] ; Ning Qiu [République populaire de Chine] ; Yongxian Guan [République populaire de Chine] ; Zhiyuan Zhou [République populaire de Chine] ; Trevor Williams [États-Unis] ; Rui Bao [Suisse] ; Anne Briais [France] ; Elizabeth A. Brown [États-Unis] ; Yifeng Chen [République populaire de Chine] ; Peter D. Clift [États-Unis] ; Frederick S. Colwell [États-Unis] ; Kelsie A. Dadd [Australie] ; Weiwei Ding [République populaire de Chine] ; Iván Hernández Almeida [Suisse] ; Xiao-Long Huang [République populaire de Chine] ; Sangmin Hyun [Corée du Sud] ; Tao Jiang [République populaire de Chine] ; Anthony A. P. Koppers [États-Unis] ; Qianyu Li [République populaire de Chine] ; Chuanlian Liu [République populaire de Chine] ; Zhifei Liu [République populaire de Chine] ; Renata H. Nagai [Brésil] ; Alyssa Peleo-Alampay [Philippines] ; Xin Su [République populaire de Chine] ; Maria Luisa G. Tejada [Japon] ; Hai Son Trinh [Viêt Nam] ; Yi-Ching Yeh [République populaire de Chine] ; Chuanlun Zhang [République populaire de Chine] ; Fan Zhang [États-Unis] ; Guo-Liang Zhang [République populaire de Chine]

Source :

RBID : ISTEX:05CF29154A7148F1C2AF10BEA0146129EBCFB7B1

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.

Url:
DOI: 10.1002/2014GC005567


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<wicri:regionArea>Key Laboratory of Submarine Geoscience, Second Institute of Oceanography, State Oceanic Administration, Hangzhou</wicri:regionArea>
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<settlement type="city">Hangzhou</settlement>
<region type="province">Zhejiang</region>
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<country xml:lang="fr">Suisse</country>
<wicri:regionArea>Institute of Geography/Oeschger Centre for Climate Change Research, University of Bern, Bern</wicri:regionArea>
<placeName>
<settlement type="city">Berne</settlement>
<region type="région" nuts="3">Canton de Berne</region>
<settlement type="city">Berne</settlement>
</placeName>
<orgName type="university">Université de Berne</orgName>
</affiliation>
</author>
<author>
<name sortKey="Huang, Xiao Ong" sort="Huang, Xiao Ong" uniqKey="Huang X" first="Xiao-Long" last="Huang">Xiao-Long Huang</name>
<affiliation wicri:level="3">
<country xml:lang="fr">République populaire de Chine</country>
<wicri:regionArea>State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou</wicri:regionArea>
<placeName>
<settlement type="city">Jiangmen</settlement>
<region type="province">Guangdong</region>
</placeName>
</affiliation>
</author>
<author>
<name sortKey="Hyun, Sangmin" sort="Hyun, Sangmin" uniqKey="Hyun S" first="Sangmin" last="Hyun">Sangmin Hyun</name>
<affiliation wicri:level="1">
<country xml:lang="fr">Corée du Sud</country>
<wicri:regionArea>Marine Geology and Geophysics Division, Korea Institute of Ocean Science and Technology, Ansan</wicri:regionArea>
<wicri:noRegion>Ansan</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Jiang, Tao" sort="Jiang, Tao" uniqKey="Jiang T" first="Tao" last="Jiang">Tao Jiang</name>
<affiliation wicri:level="1">
<country xml:lang="fr">République populaire de Chine</country>
<wicri:regionArea>Department of Marine Science and Engineering, Faculty of Earth Resources, China University of Geosciences, Wuhan</wicri:regionArea>
<wicri:noRegion>Wuhan</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Koppers, Anthony A P" sort="Koppers, Anthony A P" uniqKey="Koppers A" first="Anthony A. P." last="Koppers">Anthony A. P. Koppers</name>
<affiliation wicri:level="1">
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Oregon, Corvallis</wicri:regionArea>
<wicri:noRegion>Corvallis</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Li, Qianyu" sort="Li, Qianyu" uniqKey="Li Q" first="Qianyu" last="Li">Qianyu Li</name>
<affiliation wicri:level="1">
<country xml:lang="fr">République populaire de Chine</country>
<wicri:regionArea>School of Ocean and Earth Sciences, Tongji University, Shanghai</wicri:regionArea>
<wicri:noRegion>Shanghai</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Liu, Chuanlian" sort="Liu, Chuanlian" uniqKey="Liu C" first="Chuanlian" last="Liu">Chuanlian Liu</name>
<affiliation wicri:level="1">
<country xml:lang="fr">République populaire de Chine</country>
<wicri:regionArea>School of Ocean and Earth Sciences, Tongji University, Shanghai</wicri:regionArea>
<wicri:noRegion>Shanghai</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Liu, Zhifei" sort="Liu, Zhifei" uniqKey="Liu Z" first="Zhifei" last="Liu">Zhifei Liu</name>
<affiliation wicri:level="1">
<country xml:lang="fr">République populaire de Chine</country>
<wicri:regionArea>State Key Laboratory of Marine Geology, Tongji University, Shanghai</wicri:regionArea>
<wicri:noRegion>Shanghai</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Nagai, Renata H" sort="Nagai, Renata H" uniqKey="Nagai R" first="Renata H." last="Nagai">Renata H. Nagai</name>
<affiliation wicri:level="4">
<country xml:lang="fr">Brésil</country>
<wicri:regionArea>Department of Physical, Chemical and Geological Oceanography, Universidade de São Paulo, São Paulo‐SP</wicri:regionArea>
<placeName>
<region type="state">État de São Paulo</region>
<settlement type="city">São Paulo</settlement>
</placeName>
<orgName type="university">Université de São Paulo</orgName>
</affiliation>
</author>
<author>
<name sortKey="Peleo Lampay, Alyssa" sort="Peleo Lampay, Alyssa" uniqKey="Peleo Lampay A" first="Alyssa" last="Peleo-Alampay">Alyssa Peleo-Alampay</name>
<affiliation wicri:level="1">
<country xml:lang="fr">Philippines</country>
<wicri:regionArea>National Institute of Geological Sciences, University of the Philippines, Quezon City</wicri:regionArea>
<wicri:noRegion>Quezon City</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Su, Xin" sort="Su, Xin" uniqKey="Su X" first="Xin" last="Su">Xin Su</name>
<affiliation wicri:level="3">
<country xml:lang="fr">République populaire de Chine</country>
<wicri:regionArea>School of Marine Geosciences, China University of Geosciences, Beijing</wicri:regionArea>
<placeName>
<settlement type="city">Pékin</settlement>
</placeName>
</affiliation>
</author>
<author>
<name sortKey="Tejada, Maria Luisa G" sort="Tejada, Maria Luisa G" uniqKey="Tejada M" first="Maria Luisa G." last="Tejada">Maria Luisa G. Tejada</name>
<affiliation wicri:level="1">
<country xml:lang="fr">Japon</country>
<wicri:regionArea>Japan Agency for Marine‐Earth Science and Technology, Kanagawa</wicri:regionArea>
<wicri:noRegion>Kanagawa</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Trinh, Hai Son" sort="Trinh, Hai Son" uniqKey="Trinh H" first="Hai Son" last="Trinh">Hai Son Trinh</name>
<affiliation wicri:level="1">
<country xml:lang="fr">Viêt Nam</country>
<wicri:regionArea>Department of Science and Technology, Ministry of Natural Resources and Environment, Hanoi</wicri:regionArea>
<wicri:noRegion>Hanoi</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Yeh, Yi Hing" sort="Yeh, Yi Hing" uniqKey="Yeh Y" first="Yi-Ching" last="Yeh">Yi-Ching Yeh</name>
<affiliation wicri:level="1">
<country xml:lang="fr">République populaire de Chine</country>
<wicri:regionArea>Taiwan Ocean Research Institute, Kaohsiung</wicri:regionArea>
<wicri:noRegion>Kaohsiung</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Zhang, Chuanlun" sort="Zhang, Chuanlun" uniqKey="Zhang C" first="Chuanlun" last="Zhang">Chuanlun Zhang</name>
<affiliation wicri:level="1">
<country xml:lang="fr">République populaire de Chine</country>
<wicri:regionArea>School of Ocean and Earth Sciences, Tongji University, Shanghai</wicri:regionArea>
<wicri:noRegion>Shanghai</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Zhang, Fan" sort="Zhang, Fan" uniqKey="Zhang F" first="Fan" last="Zhang">Fan Zhang</name>
<affiliation wicri:level="1">
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Massachusetts, Woods Hole</wicri:regionArea>
<wicri:noRegion>Woods Hole</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Zhang, Guo Iang" sort="Zhang, Guo Iang" uniqKey="Zhang G" first="Guo-Liang" last="Zhang">Guo-Liang Zhang</name>
<affiliation wicri:level="1">
<country xml:lang="fr">République populaire de Chine</country>
<wicri:regionArea>Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao</wicri:regionArea>
<wicri:noRegion>Qingdao</wicri:noRegion>
</affiliation>
</author>
</analytic>
<monogr></monogr>
<series>
<title level="j" type="main">Geochemistry, Geophysics, Geosystems</title>
<title level="j" type="alt">GEOCHEMISTRY, GEOPHYSICS, GEOSYSTEMS</title>
<idno type="ISSN">1525-2027</idno>
<idno type="eISSN">1525-2027</idno>
<imprint>
<biblScope unit="vol">15</biblScope>
<biblScope unit="issue">12</biblScope>
<biblScope unit="page" from="4958">4958</biblScope>
<biblScope unit="page" to="4983">4983</biblScope>
<biblScope unit="page-count">26</biblScope>
<date type="published" when="2014-12">2014-12</date>
</imprint>
<idno type="ISSN">1525-2027</idno>
</series>
</biblStruct>
</sourceDesc>
<seriesStmt>
<idno type="ISSN">1525-2027</idno>
</seriesStmt>
</fileDesc>
<profileDesc>
<textClass></textClass>
</profileDesc>
</teiHeader>
<front>
<div type="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.</div>
</front>
</TEI>
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<list>
<country>
<li>Australie</li>
<li>Brésil</li>
<li>Corée du Sud</li>
<li>France</li>
<li>Japon</li>
<li>Philippines</li>
<li>République populaire de Chine</li>
<li>Suisse</li>
<li>Viêt Nam</li>
<li>États-Unis</li>
</country>
<region>
<li>Canton de Berne</li>
<li>Canton de Zurich</li>
<li>Floride</li>
<li>Guangdong</li>
<li>Midi-Pyrénées</li>
<li>Nouvelle-Galles du Sud</li>
<li>Occitanie (région administrative)</li>
<li>Zhejiang</li>
<li>État de New York</li>
<li>État de São Paulo</li>
</region>
<settlement>
<li>Berne</li>
<li>Hangzhou</li>
<li>Jiangmen</li>
<li>New York</li>
<li>Pékin</li>
<li>Sydney</li>
<li>São Paulo</li>
<li>Tampa</li>
<li>Toulouse</li>
<li>Zurich</li>
</settlement>
<orgName>
<li>Université Columbia</li>
<li>Université de Berne</li>
<li>Université de Floride du Sud</li>
<li>Université de São Paulo</li>
</orgName>
</list>
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<name sortKey="Li, Chun Eng" sort="Li, Chun Eng" uniqKey="Li C" first="Chun-Feng" last="Li">Chun-Feng Li</name>
</noRegion>
<name sortKey="Chen, Yifeng" sort="Chen, Yifeng" uniqKey="Chen Y" first="Yifeng" last="Chen">Yifeng Chen</name>
<name sortKey="Ding, Weiwei" sort="Ding, Weiwei" uniqKey="Ding W" first="Weiwei" last="Ding">Weiwei Ding</name>
<name sortKey="Guan, Yongxian" sort="Guan, Yongxian" uniqKey="Guan Y" first="Yongxian" last="Guan">Yongxian Guan</name>
<name sortKey="Huang, Xiao Ong" sort="Huang, Xiao Ong" uniqKey="Huang X" first="Xiao-Long" last="Huang">Xiao-Long Huang</name>
<name sortKey="Jiang, Tao" sort="Jiang, Tao" uniqKey="Jiang T" first="Tao" last="Jiang">Tao Jiang</name>
<name sortKey="Li, Chun Eng" sort="Li, Chun Eng" uniqKey="Li C" first="Chun-Feng" last="Li">Chun-Feng Li</name>
<name sortKey="Li, Qianyu" sort="Li, Qianyu" uniqKey="Li Q" first="Qianyu" last="Li">Qianyu Li</name>
<name sortKey="Liu, Chuanlian" sort="Liu, Chuanlian" uniqKey="Liu C" first="Chuanlian" last="Liu">Chuanlian Liu</name>
<name sortKey="Liu, Qingsong" sort="Liu, Qingsong" uniqKey="Liu Q" first="Qingsong" last="Liu">Qingsong Liu</name>
<name sortKey="Liu, Zhifei" sort="Liu, Zhifei" uniqKey="Liu Z" first="Zhifei" last="Liu">Zhifei Liu</name>
<name sortKey="Qiu, Ning" sort="Qiu, Ning" uniqKey="Qiu N" first="Ning" last="Qiu">Ning Qiu</name>
<name sortKey="Song, Taoran" sort="Song, Taoran" uniqKey="Song T" first="Taoran" last="Song">Taoran Song</name>
<name sortKey="Su, Xin" sort="Su, Xin" uniqKey="Su X" first="Xin" last="Su">Xin Su</name>
<name sortKey="Sun, Zhen" sort="Sun, Zhen" uniqKey="Sun Z" first="Zhen" last="Sun">Zhen Sun</name>
<name sortKey="Wang, Jian" sort="Wang, Jian" uniqKey="Wang J" first="Jian" last="Wang">Jian Wang</name>
<name sortKey="Xu, Xing" sort="Xu, Xing" uniqKey="Xu X" first="Xing" last="Xu">Xing Xu</name>
<name sortKey="Yao, Yongjian" sort="Yao, Yongjian" uniqKey="Yao Y" first="Yongjian" last="Yao">Yongjian Yao</name>
<name sortKey="Yeh, Yi Hing" sort="Yeh, Yi Hing" uniqKey="Yeh Y" first="Yi-Ching" last="Yeh">Yi-Ching Yeh</name>
<name sortKey="Zhang, Chuanlun" sort="Zhang, Chuanlun" uniqKey="Zhang C" first="Chuanlun" last="Zhang">Chuanlun Zhang</name>
<name sortKey="Zhang, Guo Iang" sort="Zhang, Guo Iang" uniqKey="Zhang G" first="Guo-Liang" last="Zhang">Guo-Liang Zhang</name>
<name sortKey="Zhao, Junfeng" sort="Zhao, Junfeng" uniqKey="Zhao J" first="Junfeng" last="Zhao">Junfeng Zhao</name>
<name sortKey="Zhao, Xixi" sort="Zhao, Xixi" uniqKey="Zhao X" first="Xixi" last="Zhao">Xixi Zhao</name>
<name sortKey="Zhou, Zhiyuan" sort="Zhou, Zhiyuan" uniqKey="Zhou Z" first="Zhiyuan" last="Zhou">Zhiyuan Zhou</name>
</country>
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<noRegion>
<name sortKey="Lin, Jian" sort="Lin, Jian" uniqKey="Lin J" first="Jian" last="Lin">Jian Lin</name>
</noRegion>
<name sortKey="Brown, Elizabeth A" sort="Brown, Elizabeth A" uniqKey="Brown E" first="Elizabeth A." last="Brown">Elizabeth A. Brown</name>
<name sortKey="Clift, Peter D" sort="Clift, Peter D" uniqKey="Clift P" first="Peter D." last="Clift">Peter D. Clift</name>
<name sortKey="Colwell, Frederick S" sort="Colwell, Frederick S" uniqKey="Colwell F" first="Frederick S." last="Colwell">Frederick S. Colwell</name>
<name sortKey="Koppers, Anthony A P" sort="Koppers, Anthony A P" uniqKey="Koppers A" first="Anthony A. P." last="Koppers">Anthony A. P. Koppers</name>
<name sortKey="Kulhanek, Denise K" sort="Kulhanek, Denise K" uniqKey="Kulhanek D" first="Denise K." last="Kulhanek">Denise K. Kulhanek</name>
<name sortKey="Williams, Trevor" sort="Williams, Trevor" uniqKey="Williams T" first="Trevor" last="Williams">Trevor Williams</name>
<name sortKey="Zhang, Fan" sort="Zhang, Fan" uniqKey="Zhang F" first="Fan" last="Zhang">Fan Zhang</name>
<name sortKey="Zhu, Jian" sort="Zhu, Jian" uniqKey="Zhu J" first="Jian" last="Zhu">Jian Zhu</name>
</country>
<country name="Suisse">
<region name="Canton de Zurich">
<name sortKey="Bao, Rui" sort="Bao, Rui" uniqKey="Bao R" first="Rui" last="Bao">Rui Bao</name>
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<name sortKey="Almeida, Ivan Hernandez" sort="Almeida, Ivan Hernandez" uniqKey="Almeida I" first="Iván Hernández" last="Almeida">Iván Hernández Almeida</name>
</country>
<country name="France">
<region name="Occitanie (région administrative)">
<name sortKey="Briais, Anne" sort="Briais, Anne" uniqKey="Briais A" first="Anne" last="Briais">Anne Briais</name>
</region>
</country>
<country name="Australie">
<region name="Nouvelle-Galles du Sud">
<name sortKey="Dadd, Kelsie A" sort="Dadd, Kelsie A" uniqKey="Dadd K" first="Kelsie A." last="Dadd">Kelsie A. Dadd</name>
</region>
</country>
<country name="Corée du Sud">
<noRegion>
<name sortKey="Hyun, Sangmin" sort="Hyun, Sangmin" uniqKey="Hyun S" first="Sangmin" last="Hyun">Sangmin Hyun</name>
</noRegion>
</country>
<country name="Brésil">
<region name="État de São Paulo">
<name sortKey="Nagai, Renata H" sort="Nagai, Renata H" uniqKey="Nagai R" first="Renata H." last="Nagai">Renata H. Nagai</name>
</region>
</country>
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<noRegion>
<name sortKey="Peleo Lampay, Alyssa" sort="Peleo Lampay, Alyssa" uniqKey="Peleo Lampay A" first="Alyssa" last="Peleo-Alampay">Alyssa Peleo-Alampay</name>
</noRegion>
</country>
<country name="Japon">
<noRegion>
<name sortKey="Tejada, Maria Luisa G" sort="Tejada, Maria Luisa G" uniqKey="Tejada M" first="Maria Luisa G." last="Tejada">Maria Luisa G. Tejada</name>
</noRegion>
</country>
<country name="Viêt Nam">
<noRegion>
<name sortKey="Trinh, Hai Son" sort="Trinh, Hai Son" uniqKey="Trinh H" first="Hai Son" last="Trinh">Hai Son Trinh</name>
</noRegion>
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</tree>
</affiliations>
</record>

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