Mineralogy, geochemistry, and Nd isotope composition of the Rainbow hydrothermal field, Mid-Atlantic Ridge

Abstract

Petrological, geochemical and Nd-isotopic analyses have been carried out on rock samples from the Rainbow vent field to assess the evolution of the hydrothermal system. The Rainbow vent field is an ultramafic-hosted hydrothermal system located on the Mid-Atlantic Ridge, characterized by vigorous high-temperature venting (~365ºC) and unique chemical composition of fluids: high chlorinity, low pH and very high Fe and REE contents (Douville et al. 2002). Serpentinisation has occurred under a low-temperature (<270ºC) retrograde

Rare earth element and yttrium analyses of sulfides from the Dachang Sn-polymetallic ore field, Guangxi Province, China: Implication for ore genesis

“…It has been demonstrated that the REE patterns in these sulfides resemble the patterns of the hydrothermal fluids (Mills and Elderfield, 1995). Marques et al (2006) also demonstrated that REE patterns of sulfides from the Rainbow hydrothermal field, Mid-Atlantic Ridge clearly reflect the vent fluid REE pattern with significant LREE enrichment and positive Eu anomaly.…”

Culture dependent and independent analyses of 16S rRNA and ATP citrate lyase genes: a comparison of microbial communities from different black smoker chimneys on the Mid-Atlantic Ridge

“…Rainbow than at Logatchev (Douville et al 2002, Marques et al 2006. Moreover, 471 geochemical differences have been reported between black smokers within the Logatchev 472 field, mostly related to subsurface mixing with seawater, which results in cooling and 473 chemical alteration of the fluids emanating from some of the chimneys (Schmidt et al 474 2006).…”

Gold-bearing ferroselite (FeSe2) from Trogtal, Harz, Germany, and significance of its Co/Ni ratio

“…Pyrite with Co/Ni > 1 has been used to distinguish pyrite of volcanogenic origin (e.g., Bralia et al 1979;Marques et al 2006), in particular where high-salinity brines interacted with volcanic host rocks. For example, Cl-rich fluids, which have Co/Ni > 1 (Douville et al 2002), are thought to have formed volcanogenic pyrite that is also distinguished by Co/Ni > 1 (Marques et al 2006).…”

“…For example, Cl-rich fluids, which have Co/Ni > 1 (Douville et al 2002), are thought to have formed volcanogenic pyrite that is also distinguished by Co/Ni > 1 (Marques et al 2006). Similarly, Pal et al (2011) have argued that the chemical composition of their hydrothermal pyrite, which is enriched in Co with Co/Ni > 1, fingerprints a high-salinity fluid.…”

“…Pyrite has also been investigated for other trace and minor elements. Among them, the contents of Co and Ni in pyrite, specifically its Co/Ni ratios, have been used as an indicator of the environment of pyrite formation (e.g., Loftus-Hills and Solomon 1967;Bralia et al 1979;Clark et al 2004;Marques et al 2006;Koglin et al 2010;Pal et al 2011). Recently, the Co/Ni ratio in arsenopyrite has been applied to constrain the fluid source for an Au-lode deposit (Cabral and Koglin 2012).…”