Control of subduction rate on Tonga-Kermadec arc magmatism

doi:10.1007/s00343-018-7026-8

IOCAS-IR > 海洋地质与环境重点实验室

	Control of subduction rate on Tonga-Kermadec arc magmatism
	Luo Qing 1,2; Zhang Guoliang 1,3,4
	2018-05-01
发表期刊	JOURNAL OF OCEANOLOGY AND LIMNOLOGY
ISSN	2096-5508
卷号	36 期号:3 页码:687-699
通讯作者	Zhang Guoliang(zhangguoliang@qdio.ac.cn)
摘要	Dehydration/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.
关键词	subduction rate arc magmatism Tonga-Kermadec Arc
DOI	10.1007/s00343-018-7026-8
收录类别	SCI
语种	英语
资助项目	National 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 ; National 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研究方向	Marine & Freshwater Biology ; Oceanography
WOS类目	Limnology ; Oceanography
WOS记录号	WOS:000438791100009
出版者	SCIENCE PRESS
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/163505
专题	海洋地质与环境重点实验室
通讯作者	Zhang Guoliang
作者单位	1.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
第一作者单位	中国科学院海洋研究所
通讯作者单位	中国科学院海洋研究所
推荐引用方式 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.