Expedition 351 summary

Gurnis, Michael; Drab, L.; Hamada, Mareomi; Ishizuka, Osamu; Arculus, R. J.; Brandl, Philipp A.; Barth, Andrew P.; Guerra, Rodrigo do Monte; Hickey‐Vargas, Rosemary; Bogus, Kara; Aljahdali, Mohammed H.; Bandini-Maeder, Alexandre N.; Jiang, Fangming; Kanayama, Kyoko; Marsaglia, Kathleen M.; McCarthy, Anders; Meffre, Sébastien; Kusano, Yuki; Li, H.; Kender, Sev; Loudin, Lorne C.; Maffione, Marco; Morris, A.; Neuhaus, Martin; Savov, Ivan P.; Silva, C.A. Sena Da; Tepley, F. J.; Yogodzinski, G. M.; Land, Cees van der

doi:10.14379/iodp.proc.351.101.2015

Cited by 14 publications

(8 citation statements)

References 81 publications

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“…The Eocene through Oligocene volcaniclastic sequence of Units II, III, and IV at U1438 constitute a record of early Izu‐Bonin arc evolution, for which the tephra glass record is relatively sparse (Arculus et al, ). The ages of arc‐derived zircons from this study provide maximum depositional ages for multiple core intervals within Unit III, in particular improving the temporal resolution in the lower two‐thirds of Unit III for which age constraints from paleomagnetic data and fossils are more limited and where diagenetic destruction of primary volcanogenic components is pervasive.…”

Section: Discussionmentioning

confidence: 99%

“…The principal drilling objectives for this site were to characterize the nature of the igneous crust and mantle prior to IBM arc inception and to characterize the Paleogene compositional evolution of the nascent IBM magmatic arc utilizing the volcaniclastic record overlying basement. Four stratigraphic units above basement were cored at Site 351‐U1438 (Arculus et al, ; hereafter “U1438” for brevity). Unit I is comprised of Oligocene to recent terrigenous and biogenic mud with discrete tephra layers.…”

Section: Geologic Settingmentioning

confidence: 99%

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Generation of Silicic Melts in the Early Izu‐Bonin Arc Recorded by Detrital Zircons in Proximal Arc Volcaniclastic Rocks From the Philippine Sea

Barth

Tani

Meffre

et al. 2017

Geochem Geophys Geosyst

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A 1.2 km thick Paleogene volcaniclastic section at International Ocean Discovery Program Site 351‐U1438 preserves the deep‐marine, proximal record of Izu‐Bonin oceanic arc initiation, and volcano evolution along the Kyushu‐Palau Ridge (KPR). Pb/U ages and trace element compositions of zircons recovered from volcaniclastic sandstones preserve a remarkable temporal record of juvenile island arc evolution. Pb/U ages ranging from 43 to 27 Ma are compatible with provenance in one or more active arc edifices of the northern KPR. The abundances of selected trace elements with high concentrations provide insight into the genesis of U1438 detrital zircon host melts, and represent useful indicators of both short and long‐term variations in melt compositions in arc settings. The Site U1438 zircons span the compositional range between zircons from mid‐ocean ridge gabbros and zircons from relatively enriched continental arcs, as predicted for melts in a primitive oceanic arc setting derived from a highly depleted mantle source. Melt zircon saturation temperatures and Ti‐in‐zircon thermometry suggest a provenance in relatively cool and silicic melts that evolved toward more Th and U‐rich compositions with time. Th, U, and light rare earth element enrichments beginning about 35 Ma are consistent with detrital zircons recording development of regional arc asymmetry and selective trace element‐enriched rear arc silicic melts as the juvenile Izu‐Bonin arc evolved.

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Section: Discussionmentioning

confidence: 99%

Section: Geologic Settingmentioning

confidence: 99%

Generation of Silicic Melts in the Early Izu‐Bonin Arc Recorded by Detrital Zircons in Proximal Arc Volcaniclastic Rocks From the Philippine Sea

Barth

Tani

Meffre

et al. 2017

Geochem Geophys Geosyst

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“…Thus, the main objective of Expedition 350 was to reveal the history of "the missing half" of the subduction factory (Tamura et al, 2013). The second expedition (351) focused on IBM arc origins by drilling west of the Kyushu-Palau Ridge (Figure 1), where it was inferred that the foundation, origin, and early evolution of the IBM arc are recorded (Arculus et al, 2013(Arculus et al, , 2015. The third expedition (352) examined the processes of subduction initiation, by drilling the outer IBM fore-arc ( Figure 1; Pearce et al, 2013Pearce et al, , 2015.…”

Section: Introductionmentioning

confidence: 99%

The missing half of the subduction factory: shipboard results from the Izu rear arc, IODP Expedition 350

Busby

Tamura

Blum

et al. 2017

International Geology Review

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IODP Expedition 350 was the first to be drilled in the rear part of the Izu-Bonin, although several sites had been drilled in the arc axis to fore-arc region; the scientific objective was to understand the evolution of the Izu rear arc, by drilling a deepwater volcaniclastic section with a long temporal record (Site U1437). The Izu rear arc is dominated by a series of basaltic to dacitic seamount chains up to ~100 km long roughly perpendicular to the arc front. Dredge samples from these are geochemically distinct from arc front rocks, and drilling was undertaken to understand this arc asymmetry. Site U1437 lies in a ~20 km-wide basin between two rear arc seamount chains, ~90 km west of the arc front, and was drilled to 1804 mbsf with excellent recovery. We expected to drill a volcaniclastic apron, but the section is much more mud-rich than expected (~60%), and the remaining fraction of the section is much finer-grained than predicted from its position within the Izu arc, composed half of ashes/tuffs, and half of lapilli tuffs of fine grain size (clasts <3 cm). Volcanic blocks (>6.4 cm) are only sparsely scattered through the lowermost 25% of the section, and only one igneous unit was encountered, a rhyolite peperite intrusion at ~1390 mbsf. The lowest biostratigaphic datum is at 867 mbsf (~6.5 Ma), the lowest paleomagnetic datum is at ~1300 mbsf (~9 Ma), and the rhyolite peperite at ~1390 mbsf has yielded a U-Pb zircon concordia intercept age of 13.6 +1.6/-1.7 Ma. Both arc front and rear arc sources contributed to the fine-grained (distal) tephras of the upper 1320m, but the coarse-grained (proximal) volcaniclastics in the lowest 25% of the section are geochemically similar to the arc front, suggesting arc asymmetry is not recorded in rocks older than ~13 Ma.

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“…On the basis of morphology, chemical composition, and isotopic characteristics, the basalt sheet lavas and pillows comprising Unit 1 have been divided into several subunits (a-f; Fig. 1c) 26,27 . Representative examples in thin-section of the textures and minerals of the subunits are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Basalt derived from highly refractory mantle sources during early Izu-Bonin-Mariana arc development

Arculus

Ishizuka

et al. 2021

Nat Commun

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The magmatic character of early subduction zone and arc development is unlike mature systems. Low-Ti-K tholeiitic basalts and boninites dominate the early Izu-Bonin-Mariana (IBM) system. Basalts recovered from the Amami Sankaku Basin (ASB), underlying and located west of the IBM’s oldest remnant arc, erupted at ~49 Ma. This was 3 million years after subduction inception (51-52 Ma) represented by forearc basalt (FAB), at the tipping point between FAB-boninite and typical arc magmatism. We show ASB basalts are low-Ti-K, aluminous spinel-bearing tholeiites, distinct compared to mid-ocean ridge (MOR), backarc basin, island arc or ocean island basalts. Their upper mantle source was hot, reduced, refractory peridotite, indicating prior melt extraction. ASB basalts transferred rapidly from pressures (~0.7-2 GPa) at the plagioclase-spinel peridotite facies boundary to the surface. Vestiges of a polybaric-polythermal mineralogy are preserved in this basalt, and were not obliterated during persistent recharge-mix-tap-fractionate regimes typical of MOR or mature arcs.

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Expedition 351 summary

Abstract: Introduction 4 Background and setting 11 Scientific objectives 13 Principal science results 19 Preliminary scientific assessment 22 References

Cited by 14 publications

References 81 publications

Generation of Silicic Melts in the Early Izu‐Bonin Arc Recorded by Detrital Zircons in Proximal Arc Volcaniclastic Rocks From the Philippine Sea

Generation of Silicic Melts in the Early Izu‐Bonin Arc Recorded by Detrital Zircons in Proximal Arc Volcaniclastic Rocks From the Philippine Sea

The missing half of the subduction factory: shipboard results from the Izu rear arc, IODP Expedition 350

Basalt derived from highly refractory mantle sources during early Izu-Bonin-Mariana arc development

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