A HIMU-like component in Mariana Convergent Margin magma sources during initial arc rifting revealed by melt inclusions
In: Nature Communications, Jg. 15 (2024), Heft 1, S. 1-11
Online
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Zugriff:
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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A HIMU-like component in Mariana Convergent Margin magma sources during initial arc rifting revealed by melt inclusions
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Autor/in / Beteiligte Person: | Li, Xiaohui ; Ishizuka, Osamu ; Stern, Robert J. ; Li, Sanzhong ; Lai, Zhiqing ; Somerville, Ian ; Suo, Yanhui ; Chen, Long ; Yu, Hongxia |
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Zeitschrift: | Nature Communications, Jg. 15 (2024), Heft 1, S. 1-11 |
Veröffentlichung: | Nature Portfolio, 2024 |
Medientyp: | academicJournal |
ISSN: | 2041-1723 (print) |
DOI: | 10.1038/s41467-024-48308-y |
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