| 大洋岛弧的前世今生 |
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| 引用本文： | 吴福元,王建刚,刘传周,刘通,张畅,纪伟强.大洋岛弧的前世今生[J].岩石学报,2019,35(1):1-15. |
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| 作者姓名： | 吴福元 王建刚 刘传周 刘通 张畅 纪伟强 |
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| 作者单位： | 中国科学院地质与地球物理研究所岩石圈演化国家重点实验室, 北京 100029;中国科学院大学地球与行星科学学院, 北京 100049,中国科学院地质与地球物理研究所岩石圈演化国家重点实验室, 北京 100029,中国科学院地质与地球物理研究所岩石圈演化国家重点实验室, 北京 100029;中国科学院大学地球与行星科学学院, 北京 100049,中国科学院地质与地球物理研究所岩石圈演化国家重点实验室, 北京 100029,中国科学院地质与地球物理研究所岩石圈演化国家重点实验室, 北京 100029,中国科学院地质与地球物理研究所岩石圈演化国家重点实验室, 北京 100029 |
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| 基金项目： | 本文受国家自然科学基金项目（41888101、41130313、41672109）资助. |
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| 摘 要： | 正这些年来似乎地球变小了,人的寿命变长了,90寻常,80刚迈入老年人之列。一些同事和学生为庆祝叶大年院士八十华诞及从事科研六十载在岩石学报出版一期论文专辑,邀请我作序,这才惊奇叶大年院士已近杖朝之年,我和他交往甚密,经常见面就觉不出有什么变化,也就觉不出他的年龄增长。叶大年老师和我是亦师亦友的关系。我称他老师是名正言顺的。最早见到他是在河南许昌地区的野外
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| 关 键 词： | 大洋岛弧 洋-洋俯冲 洋-陆俯冲 弧后扩张 蛇绿岩 |
| 收稿时间： | 2018/11/27 0:00:00 |
| 修稿时间： | 2018/12/19 0:00:00 |
Intra-oceanic arc: Its formation and evolution |
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| WU FuYuan,WANG JianGang,LIU ChuanZhou,LIU Tong,ZHANG Chang and JI WeiQiang.Intra-oceanic arc: Its formation and evolution[J].Acta Petrologica Sinica,2019,35(1):1-15. |
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| Authors: | WU FuYuan WANG JianGang LIU ChuanZhou LIU Tong ZHANG Chang and JI WeiQiang |
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| Institution: | State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China,State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China,State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China,State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China,State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China and State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | According to the theory of plate tectonics, plate boundary is the locus of the various geological processes shaping our Earth, and thus the focus of the modern geology. It is generally accepted that the plate boundaries can be divided into three types, i.e., divergent (mid-oceanic ridge), convergent (subduction and collision zones), and strike-slip (transform fault). As for the convergent boundary, it can be further subdivided into intra-oceanic arc by oceanic-oceanic subduction, Andean continental arc by oceanic-continental subduction, and collisional belt by continental-continental collision. The intra-oceanic arc is relatively less studied compared to other types of convergent boundary. Traditionally, the Japanese islands were thought as an intra-oceanic arc, but this point of view is not hold anymore since it was found that they are fragments from the Asian continental margin. According to the available investigations, intra-oceanic arcs are mostly located along the western Pacific Ocean, represented by the Izu-Bonin-Mariana arc between the Pacific and Philippine plates, and the southwestern (SW) Pacific arc between the Pacific and Australian plates. The most important topic for the study of the intra-oceanic arc is that how subduction was initiated between oceanic-oceanic plates. It is mostly thought that the transform fault can make contact of the different aged oceanic plates, and subsequently in this case that the older and dense lithosphere can underthrust beneath the younger and less-dense plate, which is also ascribed as "Subduction Initial Rule-SIR". However, no actual example was found to date on the Earth for the situation described above, and moreover, it is hard to understand that the intra-oceanic arcs are extensively developed in SW Pacific, although the transform faults occurs everywhere in the seafloor. Data compilation indicates that the above intra-oceanic arcs are in fact continental relics rifted from the Australian continent. The subduction of the old and dense Pacific plate resulted in formation of the continental arc and associated back-arc basin, and the spreading within the back-arc basin then rifted the arc and made it evolved toward oceanic lithosphere. Therefore, the oceanic-oceanic subduction is not valid theoretically, and not documented in the geological records either. However, in the Caribbean, Scotia and Aleutian areas, the intra-oceanic arcs were formed by subduction jump and polarity reverse due to subduction of oceanic plateau. Whatever, the spontaneous initial subduction model needs further geological data to be verified. |
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| Keywords: | Intra-oceanic arc Oceanic-oceanic subduction Oceanic-continental subduction Back-arc extension Ophiolite |
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