globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2416
论文题名:
Deformation-related volcanism in the Pacific Ocean linked to the Hawaiian-Emperor bend
作者: O'Connor J.M.; Hoernle K.; Dietmar Müller R.; Morgan J.P.; Butterworth N.P.; Hauff F.; Sandwell D.T.; Jokat W.; Wijbrans J.R.; Stoffers P.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期:5
起始页码: 393
结束页码: 397
语种: 英语
Scopus关键词: deformation ; geochemical method ; lava ; mantle plume ; mid-ocean ridge ; oceanic crust ; plate motion ; plate tectonics ; seamount ; subduction zone ; volcanism ; Hawaiian Islands ; Pacific Ocean
英文摘要: Ocean islands, seamounts and volcanic ridges are thought to form above mantle plumes. Yet, this mechanism cannot explain many volcanic features on the Pacific Ocean floor and some might instead be caused by cracks in the oceanic crust linked to the reorganization of plate motions. A distinctive bend in the Hawaiian-Emperor volcanic chain has been linked to changes in the direction of motion of the Pacific Plate, movement of the Hawaiian plume, or a combination of both. However, these links are uncertain because there is no independent record that precisely dates tectonic events that affected the Pacific Plate. Here we analyse the geochemical characteristics of lava samples collected from the Musicians Ridges, lines of volcanic seamounts formed close to the Hawaiian-Emperor bend. We find that the geochemical signature of these lavas is unlike typical ocean island basalts and instead resembles mid-ocean ridge basalts. We infer that the seamounts are unrelated to mantle plume activity and instead formed in an extensional setting, due to deformation of the Pacific Plate. 40 Ar/ 39 Ar dating reveals that the Musicians Ridges formed during two time windows that bracket the time of formation of the Hawaiian-Emperor bend, 53-52 and 48-47 million years ago. We conclude that the Hawaiian-Emperor bend was formed by plate-mantle reorganization, potentially triggered by a series of subduction events at the Pacific Plate margins. © 2015 Macmillan Publishers Limited. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106289
Appears in Collections:气候减缓与适应
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作者单位: Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Alten Hafen 26, Bremerhaven, Germany; GeoZentrum Nordbayern, University Erlangen-Nürnberg, Schlossgarten 5, Erlangen, Germany; Faculty of Earth and Life Sciences, VU University Amsterdam, De Boelelaan 1085, HV Amsterdam, Netherlands; GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstrasse 1-3, Kiel, Germany; Earth Byte Group, School of Geosciences, University of SydneyNSW, Australia; Department of Earth Sciences, Royal Holloway, University of London, Egham, Surrey, United Kingdom; Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, 9500 Gilman Drive, San Diego, CA, United States; University of Bremen, Fachbereich 5, Bremen, Germany; Institute for Geosciences, Christian-Albrechts-University, Ludewig-Meyn-Str. 10, Kiel, Germany

Recommended Citation:
O'Connor J.M.,Hoernle K.,Dietmar Müller R.,et al. Deformation-related volcanism in the Pacific Ocean linked to the Hawaiian-Emperor bend[J]. Nature Geoscience,2015-01-01,8(5)
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