Abstract International Ocean Discovery Program (IODP) Expedition 351 drilled a rear-arc sedimentary succession ~50 km west of the Kyushu-Palau Ridge, an arc remnant formed by rifting during formation Shikoku Basin and Izu-Bonin-Mariana arc. The ~1-km-thick Eocene to Oligocene deep-marine volcaniclastic recovered at Site U1438 provides unique opportunity study nearly complete record intra-oceani...

The Shiquanhe–Laguoco–Yongzhu–Jiali ophiolite mélange belt in Tibet includes the Laguoco Tso as part of its western segment. Researchers studying evolution Tibetan Plateau and Tethys have taken a keen interest debated relationship between this Bangong–Nujiang belt. However, there is little research field. This study reports rock geochemistry, SIMS (the secondary ion mass spectrometry) zircon U-...

It is generally accepted that the subduction polarity reversal (SPR) results from strong collision of two plates. Yet, SPR Solomon Back-arc Basin started in “soft docking” stage, and mechanism by which induced initiation (SI) remains elusive. We find mass depletion plateau influences evolution patterns during SI. And island arc rheological strength affects development shear zone between an back...

Large igneous province subduction is a rare process on Earth. A modern example is the subduction of the oceanic Hikurangi Plateau beneath the southern Kermadec arc, offshore New Zealand. This segment of the arc has the largest total lava volume erupted and the highest volcano density of the entire Kermadec arc. Here we show that Kermadec arc lavas south of ~32°S have elevated Pb and Sr and low ...

Introduction Hydrothermal systems and their associated metal deposits have been studied at oceanic spreading centers since the late 1970s when they were first discovered. More recently, those studies have been extended to subduction zone hydrothermal systems including active volcanic arcs and back-arc environments. Oceanic spreading centers compose a global ridge system where new ocean crust is...

Abstract The Pleistocene (2.2–1.5 Ma) Koloula Igneous Complex (KIC) on Guadalcanal in the Solomon island arc consists of a low-K calc-alkaline sequence ultramafic to felsic plutonic rocks. We present whole-rock major and trace element Sr–Nd-Pb isotope data, as well mineral compositions that record magmatic evolution complex. intrusive is grouped into two cycles, Cycle 1 2, comprising gabbroic o...

Abstract Most known porphyry Cu deposits formed in the Phanerozoic and are exclusively associated with moderately oxidized, sulfur-rich, hydrous arc-related magmas derived from partial melting of asthenospheric mantle metasomatized by slab-derived fluids. Yet, whether similar metallogenic processes also operated Precambrian remains obscure. Here we address issue investigating origin, f O 2 , S ...

The geochemical discriminate diagrams help to distinguish the volcanics recovered from different tectonic settings but these diagrams tend to group the ocean floor basalts (OFB) under one class i.e., as mid-oceanic ridge basalts (MORB). Hence, a method is specifically needed to identify the OFB as normal (N-MORB), enriched (E-MORB) and ocean island basalts (OIB). We have applied Artificial Neur...