.... Proceedings of the International Ocean Discovery Program 376: College Station, TX (International Ocean Discovery Program) , https://doi.org/10.14379/iodp.proc.376.106.2019 . de Ronde , C.E.J. , Humphris , S.E. , Höfig , T.W. and the IODP Expedition 376 Scientists , 2019 d, Site U1530...

... in NRM intensity (i.e., <1% of the initial NRM value). Fig. 1. Brothers volcano bathymetry (m) with locations of International Ocean Discovery Program (IODP) drill sites (black dots). Inset shows the tectonic setting and location of Brothers volcano in the Havre Trough, between the Colville...

... with hydrothermal fluid upflow zones (Caratori Tontini et al., 2012) and incorporate the known vent fields (with the exception of the Lower Cone), including Upper Caldera, NW Caldera, West Caldera, SE Caldera (extinct), and Upper Cone. International Ocean Discovery Program (IODP) drill sites referred to throughout...

... of Hole U1530A ( de Ronde et al., 2019d ). Fig. 1. A) Detailed bathymetry of Brothers volcano and its environs (after Embley et al., 2012 ), and the location of sites drilled during IODP Expedition 376. Labels designate North fault (NF), South fault (SF), North rift zone (NRZ), Upper Cone (UC...

...- to a more rock-dominated system with increasing depth. In contrast, the downhole variations of δ 11 B at Snowcap as well as δ 11 B and δ 18 O variations at the NW Caldera (Site U1530) of Brothers volcano are suggested to indicate changes in water-rock ratios and, in the latter case, also temperature...

... sea floor (mbsf) from both the Upper Cone (Site U5128) and NW Caldera sites (Site U1527 and U1530), drilled by the International Ocean Discovery Program. The dacitic to rhyolitic breccias that make up the volcano are variably altered to alteration mineral assemblages consisting of chlorite + quartz...

... Program (IODP) Expedition 376 ( de Ronde et al., 2019a ) drilled five sites on Brothers volcano between May and July 2018, recovering 222.4 m of core that consists largely of dacitic volcaniclastics (breccia) and lava flows. Alteration is pervasive, and mineral assemblages are complex and variable...

... forming. In 2018, International Ocean Discovery Program (IODP) Expedition 376 recovered drill cores from an active hydrothermal field at Brothers volcano, in the Kermadec arc. These provide insight into the formation of mineral deposits along arcs, the structure and permeability of hydrothermal sites...

... the cooling magma have a high ore-forming potential. International Ocean Discovery Program (IODP) Expedition 376, “Brothers Arc Flux” (May 5–July 5, 2018), drilled a total of five sites (U1527 to U1531) into the edifice of Brothers volcano ( de Ronde et al., 2019a ). The objective of the expedition...

... across the borehole exhibited in the imaging correspond well to the small range of variations in high-resolution velocities. The preceding theory and technique have been applied to process and interpret a field logging data set from the U1530 well from IODP. The formations beneath the sea water...