Excess3He in the deep water over the Mid-Atlantic Ridge at 26°N: evidence of hydrothermal activity
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3He along the ultraslow spreading AMOR in the Norwegian-Greenland Seas
2019, Deep-Sea Research Part I: Oceanographic Research PapersCitation Excerpt :3He is introduced into the water column through two different processes. ( 1) Radiogenic 3He is produced via decay of tritium (e.g. Jenkins et al., 1980). The tritium input to the world's oceans was minor before the nuclear age when it increased dramatically as a result of abundant testing of thermonuclear weapons in the atmosphere (Craig and Lal, 1961; Eriksson, 1965). (
The distributions of helium isotopes and tritium along the U.S. GEOTRACES North Atlantic sections (GEOTRACES GAO3)
2015, Deep-Sea Research Part II: Topical Studies in OceanographyCitation Excerpt :Such calculations assume a globally constant Fe:3He ratio, whereas recent observations suggest a significant difference in this ratio between fast- and slow-spreading ridges (Saito et al., 2013). One objective of the U.S. GEOTRACES North Atlantic sections was to sample 3He and other TEIs at and near another slow-spreading ridge hydrothermal site, the TAG Hydrothermal Site at 26°N on the Mid Atlantic Ridge (Jenkins et al., 1980; Rona et al., 1975; Rona et al., 1984). A description of the cruise, station locations, and water mass distributions exists as another paper in this special issue (Jenkins et al., 2015), but for reference we show the station locations in Fig. 1, which are plotted against the distribution of apparent oxygen utilization (AOU) on the 26.8 kg m−3 neutral surface, estimated using the World Ocean Atlas 2009 climatology (Garcia et al., 2010).
The distribution of dissolved manganese in the tropical-subtropical North Atlantic during US GEOTRACES 2010 and 2011 cruises
2014, Marine ChemistryCitation Excerpt :The input of dissolved Mn from hydrothermal vents at the mid-ocean ridge can be observed from vertical profiles of dissolved Mn at station USGT11-14, USGT11-16 and USGT11-18 (Fig. 11). The “TAG” hydrothermal vent at the mid-ocean ridge locates near station USGT11-16 (Jenkins et al., 1980). At this station, dissolved Mn concentration of ~ 26.1 nM was observed at 3342 m depth (Fig. 11).
The changing vision of marine minerals
2008, Ore Geology ReviewsIsotopes of the light noble gases in mineral waters in the eastern part of the Balkan peninsula, Bulgaria
1994, Geochimica et Cosmochimica ActaHelium, radon and manganese at the TAG and Snakepit hydrothermal vent fields, 26° and 23°N, Mid-Atlantic Ridge
1992, Earth and Planetary Science Letters