We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
A HIMU-like component in Mariana Convergent Margin magma sources during initial arc rifting revealed by melt inclusions.
- Authors
Li, Xiaohui; Ishizuka, Osamu; Stern, Robert J.; Li, Sanzhong; Lai, Zhiqing; Somerville, Ian; Suo, Yanhui; Chen, Long; Yu, Hongxia
- 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. 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.
- Subjects
BACK-arc basins; RIFTS (Geology); MAGMAS; INCLUSIONS (Mineralogy &; petrology); ISLAND arcs; MELTING; SEAMOUNTS
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-48308-y