Fingerprinting subducted oceanic crust and Hainan Plume in the melt sources of Cenozoic Basalts from the South China Sea Region

Tian Zhi-Xian; Yan Yi; Huang Chi-Yue; Dilek Yildirim; Yu Meng-Ming; Liu Hai-Quan; Zhang Xin-Chang; Zhang Yong

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Fingerprinting subducted oceanic crust and Hainan Plume in the melt sources of Cenozoic Basalts from the South China Sea Region

机译：来自南海地区的新生代沼泽熔体融合的指纹纹理底层海洋地壳和海南羽流

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Geochemical data compilation of Cenozoic basalts recovered from the South China Sea tectonic domain shows westward weakening of the influence of a focal zone-like component in Nd-Hf, Nd-Pb and Sr-Pb, but not in Pb-Pb isotope spaces because the Pb isotopes are dominantly controlled by the high U/Pb component derived from the subducted Pacific oceanic slab. Low Th/U melt generated by recycling of marine carbonates, rather than the subduction-related enriched mantle (EM2), signals the emplacement of the Hainan Plume at similar to 25 Ma. Radiogenic Hf in the pre-existing ancient sub-continental lithospheric mantle beneath the Cathaysia Block was greatly depleted by early-stage magmatism influenced by the high U/Pb component. Hence, late Cenozoic basalts associated with the carbonatitic melts display contrasting Nd-Hf isotope covariations, with the Red River-Zhongnan Fault System as a dividing line, implying that the East and Southwest sub-basins have been developed on the Cathaysia and Indochina Blocks respectively.

机译：南海构造域新生代玄武岩的地球化学数据汇编显示，Nd-Hf、Nd-Pb和Sr-Pb中类似震源带的组分的影响向西减弱，但Pb-Pb同位素空间中的影响不明显，因为Pb同位素主要受俯冲太平洋板块衍生的高U/Pb组分控制。海相碳酸盐循环产生的低Th/U熔体，而不是俯冲相关富集地幔（EM2），表明海南地幔柱在25 Ma左右侵位。华夏地块下方已存在的古亚大陆岩石圈地幔中的放射成因Hf因受高U/Pb组分影响的早期岩浆作用而大大耗尽。因此，与碳酸盐熔体有关的晚新生代玄武岩显示了对比的Nd－Hf同位素协变，以红河-中南断裂系统为分界线，暗示东、西南次盆地分别在华夏和印度支那地块上发育。

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《Terra Nova》 |2021年第1期|共9页
作者
Tian Zhi-Xian; Yan Yi; Huang Chi-Yue; Dilek Yildirim; Yu Meng-Ming; Liu Hai-Quan; Zhang Xin-Chang; Zhang Yong;
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作者单位

China Geol Survey Qingdao Inst Marine Geol Qingdao 266071 Peoples R China;

Chinese Acad Sci Guangzhou Inst Geochem Key Lab Ocean &

Marginal Sea Geol Guangzhou Peoples R China;

Chinese Acad Sci Guangzhou Inst Geochem Key Lab Ocean &

Marginal Sea Geol Guangzhou Peoples R China;

Miami Univ Dept Geol &

Environm Earth Sci Oxford OH 45056 USA;

Chinese Acad Sci Guangzhou Inst Geochem Key Lab Ocean &

Marginal Sea Geol Guangzhou Peoples R China;

Chinese Acad Sci Guangzhou Inst Geochem Key Lab Ocean &

Marginal Sea Geol Guangzhou Peoples R China;

Chinese Acad Sci Guangzhou Inst Geochem Key Lab Ocean &

Marginal Sea Geol Guangzhou Peoples R China;

China Geol Survey Qingdao Inst Marine Geol Qingdao 266071 Peoples R China;

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正文语种 eng
中图分类天文学、地球科学;
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Fingerprinting subducted oceanic crust and Hainan Plume in the melt sources of Cenozoic Basalts from the South China Sea Region

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