A HIMU-like component in Mariana Convergent Margin magma sources during initial arc rifting revealed by melt inclusions

Xiaohui Li, Osamu Ishizuka, Robert J. Stern, Sanzhong Li (), Zhiqing Lai, Ian Somerville, Yanhui Suo, Long Chen and Hongxia Yu
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Xiaohui Li: Ocean University of China
Osamu Ishizuka: Geological Survey of Japan/AIST
Robert J. Stern: University of Texas at Dallas
Sanzhong Li: Ocean University of China
Zhiqing Lai: Ocean University of China
Ian Somerville: University College Dublin, Belfield
Yanhui Suo: Ocean University of China
Long Chen: Ocean University of China
Hongxia Yu: Guilin University of Technology

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-48308-y

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