Volcaniclastic sandstones record the influence of subducted Pacific MORB on magmatism at the early Izu-Bonin arc

McCarthy, Anders; Yogodzinski, G. M.; Bizimis, Michael; Savov, Ivan P.; Hickey‐Vargas, Rosemary; Arculus, R. J.; Ishizuka, Osamu

doi:10.1016/j.gca.2021.01.006

Cited by 9 publications

(4 citation statements)

References 92 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5c ). One can resolve these trace element and isotopic features via the addition of ≈10 wt% sediments to the melted slab 50 , 52 – 55 (Fig. 5c and Supplementary Fig.…”

Section: Resultsmentioning

confidence: 99%

Molybdenum isotopes unmask slab dehydration and melting beneath the Mariana arc

Zhao

et al. 2021

Nat Commun

View full text Add to dashboard Cite

How serpentinites in the forearc mantle and subducted lithosphere become involved in enriching the subarc mantle source of arc magmas is controversial. Here we report molybdenum isotopes for primitive submarine lavas and serpentinites from active volcanoes and serpentinite mud volcanoes in the Mariana arc. These data, in combination with radiogenic isotopes and elemental ratios, allow development of a model whereby shallow, partially serpentinized and subducted forearc mantle transfers fluid and melt from the subducted slab into the subarc mantle. These entrained forearc mantle fragments are further metasomatized by slab fluids/melts derived from the dehydration of serpentinites in the subducted lithospheric slab. Multistage breakdown of serpentinites in the subduction channel ultimately releases fluids/melts that trigger Mariana volcanic front volcanism. Serpentinites dragged down from the forearc mantle are likely exhausted at >200 km depth, after which slab-derived serpentinites are responsible for generating slab melts.

show abstract

“…5c ). One can resolve these trace element and isotopic features via the addition of ≈10 wt% sediments to the melted slab 50 , 52 – 55 (Fig. 5c and Supplementary Fig.…”

Section: Resultsmentioning

confidence: 99%

Molybdenum isotopes unmask slab dehydration and melting beneath the Mariana arc

Zhao

et al. 2021

Nat Commun

View full text Add to dashboard Cite

show abstract

“…Frontiers in Earth Science frontiersin.org beneath the Kyushu-Ryukyu arc 500 km Northwest of Site U1438. Volcaniclastic debris and ash erupted from the KPR (Brandl et al, 2017;McCarthy et al, 2021), and currently active Izu-Bonin-Mariana and Kyushu-Ryukyu arcs (McCarthy et al, 2019) respectively, has accumulated in the ASB and now lies at a water depth of 4,700 m in the Philippine Sea (Arculus et al, 2015a;Ishizuka et al, 2018).…”

Section: Figurementioning

confidence: 99%

Formation of calcium chloride brines in volcaniclastic-rich sediments

Sena

Parkhurst²,

Tepley

et al. 2022

Front. Earth Sci.

Self Cite

View full text Add to dashboard Cite

The Amami-Sankaku Basin, located in the Philippine Sea, records approximately 50 million years of sediment accumulation and diagenesis of volcanic ash derived from the Kyushu-Palau and Kyushu-Ryukyu arcs. Analyses of porewater and sediment samples from the 1461-m core recovered at IODP Expedition 351, Site U1438, included major and trace elements, strontium radiogenic isotope ratio (87Sr/86Sr), and taxonomic identification of archaeal classes and bacterial orders. Sediment X-ray diffraction and thin section analyses show that smectite, zeolites and chlorite are the main authigenic minerals. A multicomponent solute diffusion and reaction numerical model was developed to simulate the long-term diagenesis that took place in this sedimentary sequence and to account for the transition to a calcium chloride brine at about 670 mbsf. Numerical results indicate that 45% of the initial amount of volcanic ash has been dissolved at 750 mbsf. At this depth, 13% of the initial water (H2O) in the pore space is estimated to have been transferred to the solid phase by the formation of zeolites, which accounts for an increase in porewater chloride concentration. In contrast, dissolution of anorthite and volcanic ash combined with sodium uptake by zeolites accounts for the predominance of calcium in the brine. In the upper 160 m of the sedimentary column, the electrochemical migration of solutes causes chloride to move in the opposite direction of the concentration gradient, i.e., uphill diffusion, sustaining downward diffusion of seawater chloride into the sediments.

show abstract

“…3a). Actually, the radiogenic isotope composition of the mantle wedge is very commonly observed to be similar to Indian Oceantype mantle for almost all Western Pacific Subduction zones (e.g., Kamchatka, Kuriles, IBM, Ryukyu) [50][51][52][53][54] 208 Pb/ 206 Pb = 2.0430 ± 0.0069, 2 SD, n = 31) and tend towards the enriched mantle type I (EM I) field (Fig. 3a).…”

Section: Pb Isotope Compositions Of Melt Inclusionsmentioning

confidence: 89%

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

Li,

Ishizuka,

Stern

et al. 2024

Nat Commun

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Volcaniclastic sandstones record the influence of subducted Pacific MORB on magmatism at the early Izu-Bonin arc

Cited by 9 publications

References 92 publications

Molybdenum isotopes unmask slab dehydration and melting beneath the Mariana arc

Molybdenum isotopes unmask slab dehydration and melting beneath the Mariana arc

Formation of calcium chloride brines in volcaniclastic-rich sediments

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

Contact Info

Product

Resources

About