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Control of subduction rate on Tonga-Kermadec arc magmatism
Luo Qing1,2; Zhang Guoliang1,3,4
Corresponding AuthorZhang Guoliang(
AbstractDehydration/melting of oceanic crusts during returning to the mantle in subduction zones are related to origin of arc laves. The factors that influence arc magmatism include compositions of the subducting slabs, mantle wedge and subduction rates. However, distinguishing these factors remains difficult and highly debated. Subducting rate is related to the total mass of inputs and controls thermal structure, thus plays a crucial role in arc magmatism. Here we explore the relationships between geochemical variations of arc laves and convergence rates (increasing from 46 mm/a to the south to 83 mm/a to the northward) in the Tonga-Kermadec arc system. Data of geochemistry for lava samples from nine islands of this arc system are collected and compiled to investigate the role of subduction rate in arc magmatism. Laves from the northern Tonga arc with a faster subduction rate show broadly lower concentrations of TiO2 and high-field-strength elements (HFSEs, e.g. Nb, Ta, Zr, Hf), and higher Ba/Th, U/Th ratios than the Kermadec Arc to the south. Some of the Kermadec laves show the highest values of Th/Nb ratio. We suggest that the northern Tonga arc with a higher subduction rate has been influenced by a stronger role of subduction-released fluid, which results in stronger large-ion-lithophile elements (LILEs) and relatively weaker HFSEs contribution. It is interpreted that faster subduction rate tend to create a cooler subduction zone, leading to stronger dehydration subduction slab contribution with, thus, higher LILE/HFSE ratios of arc laves. The conclusion contributes to a better understanding of arc magmatism, and ultimately the long-term chemical differentiation of the Earth. More supplementary geochemical data along Tonga-Kermadec arc and tests in other arcs are needed.
Keywordsubduction rate arc magmatism Tonga-Kermadec Arc
Indexed BySCI
Funding ProjectNational Natural Science Foundation of China[41376065] ; National Natural Science Foundation of China[41522602] ; National Program on Global Change and Air-Sea Interaction[GASI-GEOGE-02] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDA11030103] ; Project of AoShan Excellent Scholar for Qingdao National Laboratory for Marine Science and Technology
WOS Research AreaMarine & Freshwater Biology ; Oceanography
WOS SubjectLimnology ; Oceanography
WOS IDWOS:000438791100009
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Document Type期刊论文
Corresponding AuthorZhang Guoliang
Affiliation1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266071, Peoples R China
4.Chinese Acad Sci, Inst Oceanol, Deep Sea Extreme Environm & Life Proc Ctr, Qingdao 266071, Peoples R China
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Luo Qing,Zhang Guoliang. Control of subduction rate on Tonga-Kermadec arc magmatism[J]. JOURNAL OF OCEANOLOGY AND LIMNOLOGY,2018,36(3):687-699.
APA Luo Qing,&Zhang Guoliang.(2018).Control of subduction rate on Tonga-Kermadec arc magmatism.JOURNAL OF OCEANOLOGY AND LIMNOLOGY,36(3),687-699.
MLA Luo Qing,et al."Control of subduction rate on Tonga-Kermadec arc magmatism".JOURNAL OF OCEANOLOGY AND LIMNOLOGY 36.3(2018):687-699.
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