Journal ArticleDOI
Hydrothermal Alteration Within the Brothers Submarine Arc Volcano, Kermadec Arc, New Zealand
Andrew J. Martin,John Jamieson,Cornel E. J. de Ronde,S.E. Humphries,Stephen J. Roberts,Christopher J. MacLeod,Yuanfeng Cai,Chao Zhang,Lucy E M Schlicht,Tatsuo Nozaki +9 more
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In this paper , the authors present results of a study of the hydrothermal alteration within Brothers volcano based on core samples to a depth of 453 meters below 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.Abstract:
The hydrothermally active Brothers volcano on the Kermadec arc, New Zealand, hosts two geochemically distinct hydrothermal systems within a single caldera. At the NW Caldera, metal-sulfide–rich black smoker spires form on the caldera wall. In contrast, Fe-rich crusts and native sulfur-rich chimneys occur at the resurgent central Upper Cone. Previous studies have revealed that the contrasting styles of hydrothermalism relate to the variable contribution of magmatic volatiles between these sites, with the Upper Cone experiencing relatively higher amounts of magmatic volatile influx. We present results of a study of the hydrothermal alteration within Brothers volcano based on core samples to a depth of 453 meters below 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, illite + pyrophyllite, natroalunite + pyrophyllite, and smectite-rich assemblages. The distribution and textures of the alteration minerals within and between different sites at Brothers volcano reflect variations in temperature, fluid pH, and fluid flux. We find that natroalunite only occurs at the Upper Cone, while alteration at the NW Caldera is more diverse and is characterized by both chlorite and pyrophyllite-rich alteration, indicating that seawater-derived hydrothermal fluids overprinted earlier magmatic volatile-influenced alteration. Our data indicate that in magmatic volatile-dominated systems, the alteration mineralogy transitions from natroalunite to pyrophyllite-rich with increasing age or maturity. This is accompanied by a distinct change in sample texture from dominantly bleached selvages to a more massive, equigranular texture.read more
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Journal ArticleDOI
Fluid Inclusion Evidence for Subseafloor Magmatic-Hydrothermal Processes at Brothers Volcano, Kermadec Arc, New Zealand
TL;DR: In this paper , micro-thermometry, Raman spectroscopy, and laser ablation-inductively coupled plasma-mass spectrometery (LA-ICP-MS) were used to obtain detailed depth profiles of temperature, salinity, and composition of the hydrothermal fluids.
Journal ArticleDOI
The Origin of Magmas and Metals at the Submarine Brothers Volcano, Kermadec Arc, New Zealand
Philipp A. Brandl,Maxim Portnyagin,Heiko Zeppenfeld,Frank J. Tepley,Cornel E. J. de Ronde,Christian Timm,Folkmar Hauff,Dieter Garbe-Schönberg,Romain Bousquet +8 more
TL;DR: The International Ocean Discovery Program (IODP) Expedition 376 cored the submarine Brothers volcano of the Kermadec arc to provide insights into the third dimension and the evolution of the volcano and its associated ore-forming systems as discussed by the authors .
Journal ArticleDOI
Depth Profiles of Re-Os Geochemistry in Drill Cores from Hole U1530A in Brothers Volcano Hydrothermal Field, Kermadec Arc: Mobilization and Extreme Enrichment of Os by Volcanic Gas
TL;DR: In 2018, International Ocean Discovery Program (IODP) Expedition 376 recovered drill cores from an active hydrothermal field at Brothers volcano, in the Kermadec arc as discussed by the authors .
Journal ArticleDOI
Trace metal and sulfur cycling in a hydrothermally active arc volcano: deep-sea drilling of the Brothers volcano, Kermadec arc, New Zealand
Andrew James Martin,John Jamieson,Cornel E. J. de Ronde,S.E. Humphries,Iain McDonald,Graham D. Layne,Glenn Piercey,Christopher J. MacLeod +7 more
Journal ArticleDOI
Constraining temporal variations in metal and sulfur sources using high-resolution mineral-scale analysis of pyrite: evidence from the Brothers volcano, Kermadec arc, New Zealand
Andrew James Martin,John Jamieson,Cornel E. J. de Ronde,Graham D. Layne,Glenn Piercey,Philipp A. Brandl +5 more
References
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Journal ArticleDOI
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TL;DR: In this article, the authors use hot springs and volcanic fumaroles to understand the hydrothermal systems that formed these ore deposits, represented at the surface by hot springs, and their active equivalents.
Journal ArticleDOI
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Volatiles in subduction zone magmas : concentration and fluxes based on melt inclusion and volcanic gas data
TL;DR: In this paper, the fluxes of volatiles subducted back into the mantle along subduction zones and returned from the mantle to the surface reservoir via magmatism suggests that there is an approximate balance for structurally bound H2O and Cl.
Journal ArticleDOI
Volatiles in subduction zone magmas: concentrations and fluxes based on melt inclusion and volcanic gas data
TL;DR: In this paper, the fluxes of volatiles subducted back into the mantle along subduction zones and returned from the mantle to the surface reservoir via magmatism suggests that there is an approximate balance for structurally bound H2O and Cl.