...K. Hoernle; J. Gill; C. Timm; F. Hauff; R. Werner; D. Garbe-Schönberg; M. Gutjahr Abstract Splitting of the Vitiaz arc formed the Tonga-Kermadec and Lau-Colville Ridges (southwestern Pacific Ocean), separated by the Lau Basin in the north and Havre Trough in the south. We present new trace element...

... particles (ash). The A.D. 2012 Havre (Kermadec arc, southwestern Pacific Ocean) eruption at ∼900 m water depth deposited a unit of silicic ash with features indicative of syn- and/or post-fragmentation viscous deformation. Viscously deformed ash makes up 3%–35% of the two main ash subunits, S1 and S2...

... this may simply be due to a lack of exploration in this region. We have analyzed major, trace, and volatile element concentrations in a suite of basaltic glasses and olivine-hosted melt inclusions from volcanoes, ridges, and rifts of the southern Kermadec arc volcanic front and Havre Trough back-arc basin...

.... , 2003 , From rifting to active spreading in the Lau Basin–Havre Trough backarc system (SW Pacific): Locking/unlocking induced by seamount chain subduction : Geochemistry, Geophysics, Geosystems , v. 4 , doi: 10.1029/2001GC000261. Sager , W.W. , MacLeod , C.J. , and Abrahamsen , N...

... , v. 210 , p. 481 – 497 , doi:10.1016/S0012-821X(03)00167-5 . Todd E. Gill J.B. Wysoczanski R.J. Hergt J. Leybourne M.I. Mortimer N. , 2011 , Hf isotopic evidence for small-scale heterogeneity in the mode of mantle wedge enrichment: Southern Havre Trough and South...

... . Ruellan E. Delteil J. Wright I. Matsumoto T. , 2003 , From rifting to active spreading in the Lau Basin-Havre trough backarc system (SW Pacific): Locking/unlocking induced by seamount chain subduction : Geochemistry, Geophysics, Geosystems , v. 4 , p. 8909 , 10.1029/2001GC000261...

... , https://doi.org/10.1029/2018GC007985 . Ruellan , E. , Delteil , J. , Wright , I. , and Matsumoto , T. , 2003 , From rifting to active spreading in the Lau Basin–Havre Trough backarc system (SW Pacific): Locking/unlocking induced by seamount chain subduction : Geochemistry...

.... Of the 212 faults within the Taupō rift–Havre trough region in the NZ CFM v.1.0, the 166 that have slip rates less than 1.8 mm/yr are excluded from the geologic deformation model (Fig.  3 ). The Taupō rift–Havre trough region is the most densely faulted region in New Zealand, with cross‐strike fault spacing...

... (Hik: plateau + seamounts, see Timm et al., 2014 ), dark red = mixed Hikurangi source with sediments, and orange = preferred mode with mixing depleted mantle with a premixed source (HM) of the mixed Hikurangi source and sediments with a proportion of 80% Hik and 20% Sed. Additions of Hik, HM, and Sed...

..., or are liberated from residual mantle wedge sulfides that are oxidized by hydrous fluids. Lower ratios of (Cu, Zn, Mo, Sb, and Pb)/(MREE, HREE) in basalts from the Kermadec back arc (Havre Trough) when compared to the arc front suggests decreasing slab-related input into the mantle source away from the arc front...

... ), seamounts and (or) oceanic plateaus (e.g., English et al. 2010 ), and a subduction-related accretionary complex ( Monger 1975 ; Terry 1977 ; Ash 1994 ; Mihalynuk et al. 1998 ; English and Johnston 2005 ). Corresponding Author: Dante Canil (email: [email protected] ). Copyright remains...

...-progressive trails of volcanic islands and seamounts. Samoa has played a key role in discrediting this model and the very existence of mantle plumes, because early geochronological work failed to demonstrate a linear age progression along this chain of islands. Specifically on Savai'i Island, the bulk...

...) from the Kermadec Ridge in the northern reaches of the arc ( Fig. 1 ). Fig. 1 Location map for the Kermadec arc and the various volcanoes referred to in the papers of this special volume. The Kermadec arc-Havre Trough system is made up, from east to west, of a number of tectonic elements...

... and transportation of the mud: we present evidence that it originated largely in New Zealand, 900 km to the south. The Kermadec oceanic arc system ( Fig. 1 ) comprises, from west to east, the Colville Ridge (remnant arc), the Havre Trough (backarc basin), the Kermadec Ridge (active arc), a mid-slope terrace...

... measurements (lighter shading; Smith and Sandwell, 1997 ). TS—Tracey Seamount. Slab contours are from the Slab 2.0 model ( Hayes et al., 2018 ). Cross-section A-A′ is shown in Figure 6C , B-B′ is shown in Figure 8C , and C-C′ is shown in Figure 9C . Figure 3. Generalized map of southern Mariana...

... of the Atmosphere & Ocean—PMEL, University of Washington, 7600 Sand Point Way NE, Seattle, Washington 98115-6349. © 2014 Society of Economic Geologists. 2014 Fig. 1 A. Tectonic features of the Kermadec Ridge-Havre Trough-Colville Ridge system, northeast of New Zealand. The internal tectonic...

... Program (IODP) drill sites (black dots). Inset shows the tectonic setting and location of Brothers volcano in the Havre Trough, between the Colville and Kermadec ridges, along the active volcanic arc front (dashed black line). The location of the subduction trench is indicated by the line with teeth...

... ( Information System…, 2022 ) was used to analyze spatial distributions of the volcanoes. The most complete information about location of underwater volcanoes with their coordinates is provided in ( Avdeiko et al., 1992 ). The distances between the trench axis and summits of seamount volcanoes are specified...

... spreading in the Lau bain-Havre tough backarc system (SW Pacific): Locking/unlocking induced by seamount chain subduction : Geochemistry Geophysics and Geosystems , v. 4 , 8909 , doi: 10.1029/2001GC000261. Sawkins , F.J. , 1984 , Metal deposits in relation to plate tectonics , 2 nd ed...