| 勘察加岛弧岩浆岩研究进展 |
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| 引用本文： | 刘海洋,薛颖瑜,孙卫东.勘察加岛弧岩浆岩研究进展[J].岩石学报,2020,36(2):560-574. |
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| 作者姓名： | 刘海洋 薛颖瑜 孙卫东 |
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| 作者单位： | 中国科学院海洋研究所, 深海研究中心, 青岛 266071;青岛海洋科学与技术试点国家实验室, 海洋矿产资源评价与探测技术功能实验室, 青岛 266237;中国科学院海洋大科学研究中心, 青岛 266071,中国科学院海洋研究所, 深海研究中心, 青岛 266071;青岛海洋科学与技术试点国家实验室, 海洋矿产资源评价与探测技术功能实验室, 青岛 266237;中国科学院海洋大科学研究中心, 青岛 266071,中国科学院海洋研究所, 深海研究中心, 青岛 266071;青岛海洋科学与技术试点国家实验室, 海洋矿产资源评价与探测技术功能实验室, 青岛 266237;中国科学院海洋大科学研究中心, 青岛 266071;中国科学院大学, 北京 100049 |
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| 基金项目： | 本文受国家重点研发计划"深地资源勘查开采"重点专项（2016YFC0600408）和中国科学院先导专项（XDB18020102）联合资助. |
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| 摘 要： | 西太平洋分布了全球大部分的洋内俯冲带,也是全球沟-弧-盆体系最发育的地区。勘察加(Kamchatka)半岛位于俄罗斯远东地区,地处太平洋西北部(51°~60°N、155°~164°E),是全球环太平洋岛弧的重要组成部分。前人对勘察加岛弧岩石地幔源区性质、熔融过程、岩浆结晶分异及熔/流体交代过程进行了详细的研究,并获得了丰硕的成果。最新的研究进展表明:(1)勘察加岛弧前缘火山和中部火山的源区主要为亏损地幔,而弧后区域则存在较为富集的地幔贡献;(2)勘察加岛弧不同区域的地幔源区流体性质具有一定的差异,导致从前缘火山至中部火山,地幔熔融程度逐渐降低;(3)勘察加岛弧不同区域岩石地球化学成分存在差异,而且,沿穿弧剖面某些元素或同位素(如δ11 B)表现出系统变化的特征,反应了俯冲板片流体通量和流体性质的差异;(4)勘察加半岛部分多期次火山(如Klyuchevskoy火山)地球化学成分复杂,可能反应了源区熔融条件的不同和岩浆结晶分异过程;(5)勘察加岛弧北部与阿留申岛弧近直角相交,导致异常的构造背景,促使该区域形成了具有埃达克质特征的岛弧岩浆。
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| 关 键 词： | 俯冲带 地幔熔融 熔/流体交代 地球化学 勘察加岛弧 西太平洋 |
| 收稿时间： | 2019/9/17 0:00:00 |
| 修稿时间： | 2019/12/1 0:00:00 |
Progress of the researches on Kamchatka Arc magmatism |
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| LIU HaiYang,XUE YingYu and SUN WeiDong.Progress of the researches on Kamchatka Arc magmatism[J].Acta Petrologica Sinica,2020,36(2):560-574. |
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| Authors: | LIU HaiYang XUE YingYu and SUN WeiDong |
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| Institution: | Center of Deep Sea Research, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China;Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China,Center of Deep Sea Research, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China;Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China and Center of Deep Sea Research, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China;Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China;University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | The West Pacific contains most of the intraoceanic subduction zones,and is also the most abundant area of the trencharc-basin system in the world.The Kamchatka Peninsula(51°~60°N,155°~164°E)in Far East,Russia,located in the northwestern Pacific,and is the crucial portion of the Pacific Ring of fire.In order to elucidate the origin of the Kamchatka Arc magmatism,large amounts of researches have been carried out on the characteristics of mantle sources,melting process,magma fractionation and melt/fluid metasomatism of the mantle wedge.The latest researches demonstrated that:(1)variably depleted mantle sources exist below the Eastern Volcanic Front(EVF)and Central Kamchatka Depression(CKD)area of the Kamchatka Arc,while the mantle source below Sredinny Ridge(SR)region is significantly enriched compared to an Normal-Middle Ocean Ridge Basalt(N-MORB)source;(2)the degree of melting changes from 20%for EVF to 9%~12%for CKD and SR,which may result from the fluid properties in the different regions;(3)polygenetic volcanoes(e.g.,Klyuchevskoy)show significant variations in geochemical compositions,which may reflect the difference of melting conditions and the process of magma fractionation;(4)major and trace elements as well as isotopes(e.g.,δ11B)of arc lavas show systematic variations from the volcanic arc front to back-arc,which may result from the difference in flux and properties of slab-derived fluids;(5)the Northern Central Kamchatka Depression(NCKD)arc magmatism displays signatures of slab-derived melts,which is caused by superimposing hot mantle wedge and special plate configuration.This paper reviews the progress about the research on Kamchatka Arc magmatism,hoping to promote the understanding of the genesis of island arc magma. |
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| Keywords: | Subduction zone Mantle melting Melt/fluid metasomatism Geochemistry Kamchatka Arc West Pacific |
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