Iron isotope fractionation in a buoyant hydrothermal plume, 5°S Mid-Atlantic Ridge

Fe isotope exchange between Fe(II)aq and nanoparticulate mackinawite (FeSm) during nanoparticle growth

“…Rouxel et al (2008) and Bennett et al (2009) (Butler et al, 2005), in other words, far from the equilibrium data presented here. However, caution is required with regard to extrapolating these data to temperatures in excess of 100°C, since at those temperatures, mackinawite does not form or transforms into pyrrhotite.…”

Mineral–microbe interactions in deep-sea hydrothermal systems: a challenge for Raman spectroscopy

“…There is also a growing body of evidence that suggests that, in addition to abiotic processes, biotic-and particularly microbial-processes can be important within hydrothermal plumes (Cowen et al 1986;De Angelis et al 1993;Dick et al 2009). For example, the most recent studies indicate that organic carbon binds a significant fraction of the dissolved and particulate metals in hydrothermal plumes by the processes of complexation (Sander et al 2007;Bennett et al 2009) and aggregation (Toner et al 2009;Breier et al submitted)-processes that have competing influences on chemical dispersal. While chemical models of hydrothermal plumes have been developed, none incorporate the full range of abiotic and biotic processes now known to occur, and none are satisfactory at predicting the behaviour of more than a subset of the elements involved in hydrothermal reactions.…”

Fe Isotopic Compositions of Modern Seafloor Hydrothermal Systems and Their Influence Factors

“…The range of Fe isotope compositions ( 56 Fe) of hydrothermal fluids along modern seafloor mid-ocean ridge is from −1.26‰ to −0.14‰ with an average value of −0.52 ± 0.28‰ ( = 69) (Figure 1). Studies of the Fe isotope compositions of hydrothermal fluids from hydrothermal vent on the Pacific ridge [6,19], the Atlantic ridge [6,18,21], and the Juan de Fuca ridge [20] revealed that the Fe isotope compositions of these vent fluids varied significantly (Figure 2). The range .…”

“…The range of Fe isotope compositions of seawater is from −0.64‰ to 0.80‰, with an average 56 ; the black rectangle shows the average value of 56 Fe. All data from the literatures: river [3,4,11,12]; ocean water [13][14][15][16]; oceanic sediment [6,7,12,17]; hydrothermal sulfide [6,[18][19][20]; hydrothermal fluid [6,7,[19][20][21]; Fe-Mn noddle and crust [8,[22][23][24]; deposit [25][26][27][28][29][30][31]; banded Fe formations [32][33][34][35][36][37][38][39][40][41][42]; carbonate rock [36,43,44]; loess/dust [6,…”