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Li X, Ishizuka O, Stern RJ, Li S, Lai Z, Somerville I, Suo Y, Chen L, Yu H. A HIMU-like component in Mariana Convergent Margin magma sources during initial arc rifting revealed by melt inclusions. Nat Commun 2024; 15:4088. [PMID: 38744830 PMCID: PMC11094193 DOI: 10.1038/s41467-024-48308-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2023] [Accepted: 04/26/2024] [Indexed: 05/16/2024] Open
Abstract
Compositions of island arc and back-arc basin basalts are often used to trace the recycling of subducted materials. However, the contribution of subducted components to the mantle source during initial arc rifting before back-arc basin spreading is not yet well constrained. The northernmost Mariana arc is ideal for studying this because the transition from rifting to back-arc spreading is happening here. Here we report major and trace element and Pb isotopic compositions of olivine-hosted melt inclusions from lavas erupted during initial rifting at 24°N (NSP-24) and compare them with those in active arc front at 21°N and mature back-arc basin at 18°N. NSP-24 high-K melt inclusions have highly radiogenic Pb compositions and are close to those of the HIMU end-member, suggesting the presence of this component in the magma source. The HIMU-like component may be stored in the over-riding plate and released into arc magma with rifting. HIMU-type seamounts may be subducted elsewhere beneath the Mariana arc, but obvious HIMU-type components appear only in the initial stages of arc rifting due to the low melting degree and being consumed during the process of back-arc spreading.
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Affiliation(s)
- Xiaohui Li
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Lab of Submarine Geosciences and Prospecting Techniques, MOE and College of Marine Geosciences, Ocean University of China, Qingdao, 266100, China
- Laboratory for Marine Mineral Resources, Qingdao Marine Science and Technology Center, Qingdao, 266237, China
- Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China
| | - Osamu Ishizuka
- Institute of Geology and Geoinformation, Geological Survey of Japan/AIST, Central 7, 1-1-1, Higashi, Tsukuba, Ibaraki, 305-8567, Japan
- Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima, Yokosuka, Kanagawa, 237-0061, Japan
| | - Robert J Stern
- Department of Sustainable Earth Systems Science, University of Texas at Dallas, Richardson, TX, 75080, USA
| | - Sanzhong Li
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Lab of Submarine Geosciences and Prospecting Techniques, MOE and College of Marine Geosciences, Ocean University of China, Qingdao, 266100, China.
- Laboratory for Marine Mineral Resources, Qingdao Marine Science and Technology Center, Qingdao, 266237, China.
| | - Zhiqing Lai
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Lab of Submarine Geosciences and Prospecting Techniques, MOE and College of Marine Geosciences, Ocean University of China, Qingdao, 266100, China
| | - Ian Somerville
- UCD School of Earth Sciences, University College Dublin, Belfield, Dublin, 4, Ireland
| | - Yanhui Suo
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Lab of Submarine Geosciences and Prospecting Techniques, MOE and College of Marine Geosciences, Ocean University of China, Qingdao, 266100, China
- Laboratory for Marine Mineral Resources, Qingdao Marine Science and Technology Center, Qingdao, 266237, China
| | - Long Chen
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Lab of Submarine Geosciences and Prospecting Techniques, MOE and College of Marine Geosciences, Ocean University of China, Qingdao, 266100, China
- Laboratory for Marine Mineral Resources, Qingdao Marine Science and Technology Center, Qingdao, 266237, China
| | - Hongxia Yu
- Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration, Guilin University of Technology, Guilin, 541006, China
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Baker ET, Embley RW, Walker SL, Resing JA, Lupton JE, Nakamura KI, de Ronde CEJ, Massoth GJ. Hydrothermal activity and volcano distribution along the Mariana arc. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2007jb005423] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Edward T. Baker
- Pacific Marine Environmental Laboratory; NOAA; Seattle Washington USA
| | - Robert W. Embley
- Pacific Marine Environmental Laboratory; NOAA; Newport Oregon USA
| | - Sharon L. Walker
- Pacific Marine Environmental Laboratory; NOAA; Seattle Washington USA
| | - Joseph A. Resing
- Joint Institute for the Study of the Atmosphere and Ocean; University of Washington; Seattle Washington USA
| | - John E. Lupton
- Pacific Marine Environmental Laboratory; NOAA; Newport Oregon USA
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Larter RD, Vanneste LE, Morris P, Smythe DK. Structure and tectonic evolution of the South Sandwich arc. ACTA ACUST UNITED AC 2003. [DOI: 10.1144/gsl.sp.2003.219.01.13] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
AbstractDetailed analysis of marine magnetic profiles from the western part of the East Scotia Sea confirms continuous, organized back-arc spreading since at least 15 Ma ago. In the eastern part of the East Scotia Sea, the South Sandwich arc lies on crust that formed at the back-arc spreading centre since 10 Ma ago, so older back-arc crust forms the basement of the present inner forearc. Interpretations of two multichannel seismic reflection profiles reveal the main structural components of the arc at shallow depth, including evidence of trench-normal extension in the mid-forearc, and other features consistent with ongoing subduction erosion. The seismic profile interpretations have been used to constrain simple two-dimensional gravity models. The models were designed to provide constraints on the maximum possible thickness of the arc crust, and it is concluded that this is 20 and 19.2 km on the northern and southern lines, respectively. On the northern line the models indicate that the forearc crust cannot be much thicker than normal oceanic crust. Even with such thin crust, however, the magmatic growth rate implied by the cross-section of the arc crust is within the range recently estimated for two other arcs that have been built over a much longer interval.
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Affiliation(s)
- Robert D. Larter
- British Antarctic Survey
High Cross, Madingley Road, Cambridge CB3 0ET, UK
| | - Lieve E. Vanneste
- British Antarctic Survey
High Cross, Madingley Road, Cambridge CB3 0ET, UK
| | - Peter Morris
- British Antarctic Survey
High Cross, Madingley Road, Cambridge CB3 0ET, UK
| | - David K. Smythe
- Department of Geology and Applied Geology, University of Glasgow
UK
- GeoLogica Ltd
191 Wilton Street, Glasgow G20 6DF, UK
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Abstract
At mid-ocean ridges, plate separation leads to upward advection and pressure-release partial melting of fertile mantle material; the melt is then extracted to the spreading centre and the residual depleted mantle flows horizontally away. In back-arc basins, the subducting slab is an important control on the pattern of mantle advection and melt extraction, as well as on compositional and fluid gradients. Modelling studies predict significant mantle wedge effects on back-arc spreading processes. Here we show that various spreading centres in the Lau back-arc basin exhibit enhanced, diminished or normal magma supply, which correlates with distance from the arc volcanic front but not with spreading rate. To explain this correlation we propose that depleted upper-mantle material, generated by melt extraction in the mantle wedge, is overturned and re-introduced beneath the back-arc basin by subduction-induced corner flow. The spreading centres experience enhanced melt delivery near the volcanic front, diminished melting within the overturned depleted mantle farther from the corner and normal melting conditions in undepleted mantle farther away. Our model explains fundamental differences in crustal accretion variables between back-arc and mid-ocean settings.
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Affiliation(s)
- Fernando Martinez
- Hawaii Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA.
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