 | | Journal (article/letter/editorial) | | with the activity of hydrothermal vents on the ocean floor, the greatest progress during the last decade...fact that high-temperature mineragenesis on the ocean floor results in the formation of contemporary sulfide...sampled at the "hot" vents in the rift zones of the ocean. The appreciable collection of experimental data...high-temperature interaction with rocks of the ocean floor. While maintaining the overall level of mineralization...(200-350° C) fluids in widely separated mid-ocean, ocean-margin, and intercontinental rifts settings |  | | Journal (article/letter/editorial) | | structures on the Endeavour Segment of the Juan de Fuca Ridge Margaret K. Tivey and John R. Delaney School...m along strike paralleling the 020 trend of the ridge crest. High-temperature fluids (350 to more than...submersible. These samples represent massive, complex portions of the sulfide structures which were not...dominated by Fe sulfides and amorphous silica. Pyrite, marcasite, wurtzite, chalcopyrite, and iss are...individual layers in East Pacific Rise at 21°N and southern Juan de Fuca Ridge samples, with two exceptions: |  | Clague, D.A., Friesen, Walter, Quinterno, Paula, Morgensson, L.A., Holmes, Mark L., Morton, Janet, Bouse, Robin M., Davis, Alice (1984) Preliminary geological, geophysical, and biological data from the Gorda Ridge. Open-File Report Vol. 1984 (84-364) US Geological Survey doi:10.3133/ofr84364 | Report (issue) | | Geophysical, and Biological Data from the Gorda Ridge by David Clague, Walter Friesen, Paula Quinterno...Survey editorial standards INTRODUCTION The Gorda Ridge, an oceanic spreading center with a full-spreading...California and southern Oregon (Figure 1). The ridge consists of three segments of ridgecrest offset...northwesterly from a point on the ridge at about 42°N. The entire Gorda Ridge is only about 160 n. miles long...long and the southern 50 n. miles of the ridge is covered by turbidites. This section is called the Escanaba |  | | Journal (article/letter/editorial) | | Middle Valley at the Juan de Fuca Ridge, and in the TAG deposit at the Mid-Atlantic Ridge. Currently, mining...sulphides and vent biota at the crest of the East Pacific Rise at 21◦ N in 1979 (Francheteau et al . 1979;...ambient seawater. The metal sulphides including pyrite, sphalerite, and chalcopyrite eventually accumulate...The TAG hydrothermal mound at the Mid-Atlantic Ridge at 26◦ N, for example, has a diameter of ca. 200...ca. 50 m and is characterized by a black smoker complex, the top of which consists of several black smokers |  | Zeng, Zhigang, Ma, Yao, Chen, Shuai, Selby, David, Wang, Xiaoyuan, Yin, Xuebo (2017) Sulfur and lead isotopic compositions of massive sulfides from deep-sea hydrothermal systems: Implications for ore genesis and fluid circulation. Ore Geology Reviews, 87. 155-171 doi:10.1016/j.oregeorev.2016.10.014 | Journal (article/letter/editorial) | | fields in the East Pacific Rise (EPR), Mid-Atlantic Ridge (MAR), Central Indian Ridge NU (CIR), Southwest...Southwest Indian Ridge (SWIR), and North Fiji Basin (NFB). The sulfur MA isotopic compositions of the...sub-seafloor hydrothermal systems in sediment-free mid-ocean ridges and mature back-arc basins. Furthermore,...minerals in the super-fast and fast spreading mid-ocean ridges (MORs) exhibit less spread in their the δ34S...from modern seafloor hydrothermal systems in mid-ocean ridges (MORs) D and back-arc basins (BABs) have |  | | Journal (article/letter/editorial) | | GeologicDevelopmentof Ridge Crests and Sulfide Depositsin the Northeast Pacific Ocean* ELLEN S. KAPPEL**...edpillowlavasaredominant(e.g.,southernExplorer Ridge).Sulfidedeposition duringstagei occursimmediatelyadjacentto...stage 3. Axial Seamount,which straddlesJuande Fuca Ridge andis the westernterminationof the Cobb-Eickelbergseamountchain...heavilysedimentedfailedrifts(e.g.,MiddleValleyof Endeavour Ridge)are the largest(tensof millionsof metric tons)andare...heavilysedimentedriftsthanin volcanic-associated areas of ridge crestthat haverelativelylittle sedimentcoverbecauseof |  | | Journal (article/letter/editorial) | | prominent 20km-long NE–SW-striking felsic volcanic ridge. Elemental composition and particle morphology were...SOMMAIRE Nous documentons la présence de particules en suspension émanant de panaches hydrothermaux dans le...le champ d’activité hydrothermale de l’est du bassin de Manus, en Papouasie Nouvelle Guinée; nous avons...avons échantillonné ce matériau lors de relevés par transmissométrie CTD au cours d’expéditions marines en...évents, une crête orientée NE–SO longue de 20 km et faite de roches volcaniques felsiques. La composition |  | | Journal (article/letter/editorial) | | Valley massive sulphide deposit, northern Juan de Fuca Ridge: Pb isotope constraints Finlay M. Stuart... Scottish UniÕersities Research Reactor Centre, East Kilbride G75 0QF, UK b Department of Earth Sciences...deposit during Ocean Drilling Program Leg 139 at Middle Valley, northern Juan de Fuca Ridge, have 206 Pbr204...measured in hydrothermal sulphides from the East Pacific Ocean. 206 Pbr204 Pb ratios overlap the range of...pyrrhotites are indistinguishable from the secondary pyrite-dominated assemblage which recrystallised from |  | | Journal (article/letter/editorial) | | This is shown in Equations 1.1 and 1.2 involving pyrite. Equation 1 Equation 2 The main difference is...hematite as shown by Equations 1.3 and 1.4 involving pyrite. These minerals can accumulate as insulating crusts...Trans-Atlantic Geotraverse (TAG) and Logatchev, Mid-Atlantic Ridge sites (Dekov et al., 2011; Hannington, 1993). It...Logatchev vent field at 14°45’N on the Mid Atlantic Ridge, do not behave as sinks for heavy metals during...hydrothermal field at 26°N on the Mid Atlantic Ridge are Au enriched compared to others in the same area |  | | Report (issue) | | originally given at an international workshop on deep ocean mineral resources beyond the limits of national...tectonic settings at the modern seafloor including mid-ocean ridges, back-arc rifts, and seamounts. Many of the...the sulphide deposits consist of a black smoker complex on top of a sulphide mound which commonly is underlain...sulphides, and vent biota at the crest of the East Pacific Rise at 21°N in 19791,2 confirmed that the formation...ambient seawater. The metal sulphides including pyrite, sphalerite, and chalcopyrite eventually accumulate |  | | Report (chapter) | | 3 YE, UK 2Isotope Geosciences Unit, S U R R C , East Kilbride, Glasgow G75 OQU, UK 3 G E O M A R Technologie...II cruise. The main growth stage is dominated by pyrite and chalcopyrite, forming granular aggregates from...Fouquet et al. (1988) at off-axis sites on the East Pacific Rise at 13~ (2000 to 20000 years, Lalou et al....and by Scott et al. (1991) from the Southern Explorer Ridge (undated). This study is aimed at investigating...structurally complex double rift, separated by a narrow fault-bounded ridge (Fig. 1). The central ridge has been |  | | Journal (article/letter/editorial) | | activevolcanoon the spreading axisof the centralJuande Fuca Ridge,and (2) along the eastern axial valley of the...50' 48' 47ø UNITED 46" 45ø NTSTATES 5NEDE FUCA 43 ø Descriptionsof Deposits Mature versusimmature...including those on the East Pacific Rise at 21 ø N, the southernJuan de Fuca Ridge, the EndcavourRidge,...the depositsat 21 ø N and on the southernJuande Fuca andEndeavorRidgesarepresentlyformingfromhightem...At the Axial Seamount and the southernExplorer Ridge active hydrothermal ventingthroughold sulfide-sulfate |  | Langmuir, C., Humphris, S., Fornari, D., Van Dover, C., Von Damm, K., Tivey, M.K., Colodner, D., Charlou, J.-L., Desonie, D., Wilson, C., Fouquet, Y., Klinkhammer, G., Bougault, H. (1997) Hydrothermal vents near a mantle hot spot: the Lucky Strike vent field at 37°N on the Mid-Atlantic Ridge. Earth and Planetary Science Letters, 148 (1) 69-91 doi:10.1016/s0012-821x(97)00027-7 | Journal (article/letter/editorial) | | Lucky Strike vent field at 37’N on the Mid-Atlantic Ridge C. Langmuir ‘,*, S. Humphris b, D. Fornari b, C...Fisheries ’ Department ’ Deportment Geophysics. and Ocean Sciences, University Unkersi&. Palisades, Institution...km long ridge segment near 37”N on the Mid-Atlantic Ridge. The depth and chemistry of the ridge segment...on bare rock. The deep mantle processes that give rise to hot spots ultimately are manifested in distinctive...hydrothermal fluids and solids. Kqvwords: Mid-Atlantic Ridge; hydrothermal vents; hot spots; geochemistry; |  | | Journal (article/letter/editorial) | | Middle Valley Sulfide Deposits, Northern Juan de Fuca Ridge: Radiogenic Isotope Systematics T. BJERKGÅRD...sediment-filled rift valley at the northern Juan de Fuca Ridge, are among the largest and richest sulfide...deposits on the modern sea floor. Drilling during Ocean Drilling Program Leg 169 allowed a complete hydrothermal...rift valley at the northernmost end of the Juan de Fuca Ridge, about 150 km † Corresponding author: e-mail...Goodfellow and Blaise, 1988) and has been drilled by the Ocean Drilling Program on two occasions, during Leg 139 |  | | Report (volume) | | Hydrothermal and Biological Segmentation of Mid-Ocean Ridges Geological Society Special Publications...Hydrothermal and Biological Segmentation of Mid-Ocean Ridges EDITED BY C. J. M A C L E O D University...(08) 379-0444 Fax (08) 379-4634) India Affiliated East-West Press PVT Ltd G-1/16 Ansari Road New Delhi...C., WEST, B. P. & G~LI, L. The Southeast Indian Ridge between 127° and 132°40'E: contrasts in segmentation...1 BLONDEL, P. Segmentation of the Mid-Atlantic Ridge south of the Azores, based on acoustic classification |  | Badrzadeh, Zahra, Barrett, Timothy J., Peter, Jan M., Gimeno, Domingo, Sabzehei, Mossaieb, Aghazadeh, Mehraj (2011) Geology, mineralogy, and sulfur isotope geochemistry of the Sargaz Cu–Zn volcanogenic massive sulfide deposit, Sanandaj–Sirjan Zone, Iran. Mineralium Deposita, 46 (8) 905-923 doi:10.1007/s00126-011-0357-4 | Journal (article/letter/editorial) | | massive sulfide lens is zoned from a pyrite-rich base, to a pyrite± chalcopyrite-rich central part, and...to the upper part. The main sulfide mineral is pyrite, with lesser chalcopyrite and sphalerite. The feeder...pesudobreccia and, in the deepest part, chlorite–quartz–pyrite pesudobreccia. Footwall hydrothermal alteration...relationships, the growth history of the Sargaz deposit is complex and includes: (1) early precipitation of sulfides...seafloor as precipitation of fine-grained anhedral pyrite, sphalerite, quartz, and barite; (2) anhydrite |  | Stüben, Doris, Taibi, Nasr.Eddine, McMurtry, Gary M., Scholten, Jan, Stoffers, Peter, Zhang, Deyu (1994) Growth history of a hydrothermal silica chimney from the Mariana backarc spreading center (southwest Pacific, 18°13′N) Chemical Geology, 113 (3) 273-296 doi:10.1016/0009-2541(94)90071-x | Journal (article/letter/editorial) | | the Mariana backarc spreading center (southwest Pacific, 18 ° 13'N) Doris Stiiben a, Nasr. Eddine Taibi...indicates two ancient fluid channels infilled by pyrite, barite and marcasite. The outer rim of the chimney...between 41 ° and 50°C, although the occurrence of pyrite, barite, marcasite and quartz in the fluid channels...226Ra-rich Sr- and Ba-bearing silica with quartz and pyrite. 1. Introduction Low- and high-temperature hydrothermal...separates the active volcanoes of the west Mariana Ridge Front 275 - long, are separated by a 5-km left-offset |  | | Journal (article/letter/editorial) | | fluids.Sea-floor sulfides rangefromsulfur-rich, pyrite-marcasiteassemblages to relativelysulfur-deficient...n sulfur-richmineralassemblages (e.g.,bornite+ pyrite)andrecognizable tracemineralequilibria whichindicatea...al., 1989). However,the of mineralization can be de- and Scott, 1989; Huston and Large, 1989; Large...salinities(>_1m NaC1),and subsequently deposited in Cu-rieh, pyrite + pyrrhotite + magnetiteassem- blages. Therel... of ventfluidsat 21o N EastPacificRise(A),Explorer Ridge(B), andAxialSeamount(C-D) resemblepro- gressivemixturesof |  | Zaw, Khin, Gemmell, J.B., Large, R.R., Mernagh, T.P., Ryan, C.G. (1996) Evolution and source of ore fluids in the stringer system, Hellyer VHMS deposit, Tasmania, Australia: evidence from fluid inclusion microthermometry and geochemistry. Ore Geology Reviews, 10 (3) 251-278 doi:10.1016/0169-1368(95)00026-7 | Journal (article/letter/editorial) | | sub-stages: Stage 2A veins of crustiform quartz, pyrite, and carbonate with minor amounts of chalcopyrite...coarsely crystalline barite with variable amounts of pyrite, sphalerite, galena and carbonate. Stages 3 - 6...sequences, one of which, the felsic Central Volcanic Complex (CVC), is host to several important VHMS deposits...body with dimensions of 800 m north-south and 200 m east-west with an average vertical thickness of 45 m...stringer zone (Fig. 2). The Hellyer deposit contains pyrite, sphalerite, galena, chalcopyrite, arsenopyrite |  | | Book | | proceedings of the Gold '86 meeting in Toronto, the Pacific Rim Congress '87 in Gold Coast, Australia, and...Browne, A.H.C. Carter, H. Colley, D.S. Cronan, M.J. de Wit, P.I. Eimon, W.R. Fitches, A.O. Fuller, A.P....epithermal deposits in the Western Great Basin and Pacific Northwestern United States. Administratively, he...and exploration in Europe, Africa, and the Middle East. Professor D.1. Groves Key Centre for Teaching...exploration for hydrothermal vents in the Indian Ocean and studies of the geology and mineralogy of sulphide |  | | Journal (article/letter/editorial) | | equencein the central NorwegianCaledonides,just east of the major (25+ million metric tons)orebodyat...produced(internally) euhedral,often poikilitic, pyrite. Boththesenoncolloform pyritesareattributedto a...interest since it contains several massive sulfide de- one of severalophiolitefragmentsin the western positswhichare...Jasper/'Vasskis' hor,zons • Volcanic complex -<-,• Plutonit complex Strikeanddipof layec,ncj,myerted... and more moderate, northerly dips in the little de- Deposit geology formed southernparts which host |  | | Journal (article/letter/editorial) | | VMS deposit: TAG hydrothermal mound, Mid-Atlantic Ridge, 26°°N Received: 16 November 1998 / Accepted: 19...Mid-Atlantic Ridge provided the ®rst insights into the third dimension of a volcanichosted massive sul®de (VMS)...(VMS) deposit on a sediment-free mid-ocean ridge. Sul®de precipitation at this site started at least 20...silici®ed stockwork complex containing approximately 3.9 million tonnes of sul®de-bearing material with...mineralogical and isotopic zonation as well as a complex assemblage of sul®de-anhydrite-quartz bearing breccias can |  | | Journal (article/letter/editorial) | | since been identified along the ridges of the East Pacific Rise and other sea-floor spreading sites (Rona...(Rona 1984). The vent solutions frequently give rise to precipitates that form chimneys of up to l0 m height...sample SO 57/ 19 contained in addition sulfides (pyrite, marcasite), barite, and alumite. METHODS After...m e n t core in t h e s o u t h w e s t e r n Pacific Basin. O x y g e n i s o t o p e v a l u e s d...e d e p o s i t f r o m t h e L a u Basin, S W Pacific (Stoffers et al 1990). T h e a r g u m e n t s |  | Khin Zaw, , Hunns, S.R, Large, R.R, Gemmell, J.B, Ryan, C.G, Mernagh, T.P (2003) Microthermometry and chemical composition of fluid inclusions from the Mt Chalmers volcanic-hosted massive sulfide deposits, central Queensland, Australia: implications for ore genesis. Chemical Geology, 194 (1) 225-244 doi:10.1016/s0009-2541(02)00279-6 | Journal (article/letter/editorial) | | fault-bounded block. The Berserker Beds are a complex succession of graded, mass flow emplaced, pumiceous...225–244 moderately to strongly quartz – sericite – pyrite altered, bioturbated, volcaniclastic turbidites...sulfide veins. The stringer zone is dominated by pyrite and contains copper and gold with only traces of...end-member vent fluids from 21jN, East Pacific Rise, Guaymas Basin, Explorer Ridge and present-day sea water...end-member vent fluids from 21jN, East Pacific Rise, Guaymas Basin, Explorer Ridge and present-day sea water |  | | Journal (article/letter/editorial) | | generating the gold-rich precipitates found in western Pacific submarine arcs and back arcs. One of the more...the former are most commonly hosted by midocean ridge basalts (MORB), back-arc basin deposits may be associated...Binns et al., 1997a), midocean ridges (e.g., Explorer Ridge, Hannington et al., 1986; TAG, Hannington et...Izu-Ogasawara, Iizasa et al., 1999; southern Kermadec, de Ronde et al., 1997). Published analyses of hydrothermal...with Gold-Rich Sea-Floor Sulfides of the West Pacific Area/vent field Au (ppm) in precipitates1 Major |
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