 | | 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...common sulfide phases. Pyrrhotite, galena, and sphalerite are present in trace amounts. Barite, amorphous...individual layers in East Pacific Rise at 21°N and southern Juan de Fuca Ridge samples, with two exceptions: |  | | Journal (article/letter/editorial) | | prominent 20km-long NEâSW-striking felsic volcanic ridge. Elemental composition and particle morphology were...SOMMAIRE Nous documentons la prĂ©sence de particules en suspension Ă©manant de panaches hydrothermaux dans le...le champ dâactivitĂ© hydrothermale de lâest du bassin de Manus, en Papouasie Nouvelle GuinĂ©e; nous avons...avons Ă©chantillonnĂ© ce matĂ©riau lors de relevĂ©s par transmissomĂ©trie CTD au cours dâexpĂ©ditions marines en...Ă©vents, une crĂȘte orientĂ©e NEâSO longue de 20 km et faite de roches volcaniques felsiques. La composition |  | | 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 |  | 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 ÎŽ34S...from modern seafloor hydrothermal systems in mid-ocean ridges (MORs) D and back-arc basins (BABs) have |  | | Journal (article/letter/editorial) | | Trans-Atlantic Geotraverse (TAG) and Logatchev, Mid-Atlantic Ridge sites (Dekov et al., 2011; Hannington, 1993). It...Logatchev vent field at 14°45âN 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...ecosystems, disperse or accumulate in the wider ocean or ultimately precipitate out elsewhere as oxides...The weathering process of sulphide minerals is complex and varies as a function of primary mineralogy |  | | Journal (article/letter/editorial) | | activevolcanoon the spreading axisof the centralJuande Fuca Ridge,and (2) along the eastern axial valley of the...50' 48' 47Ăž UNITED 46" 45Ăž NTSTATES 5NEDE FUCA 43 Ăž Descriptionsof Deposits Mature versusimmature...including those on the East Pacific Rise at 21 Ăž N, the southernJuan de Fuca Ridge, the EndcavourRidge,...the depositsat 21 Ăž N and on the southernJuande Fuca andEndeavorRidgesarepresentlyformingfromhightem...At the Axial Seamount and the southernExplorer Ridge active hydrothermal ventingthroughold sulfide-sulfate |  | | 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...concentrations of copper (chalcopyrite), zinc (sphalerite), and lead (galena) in addition to gold and silver...sulphides, and vent biota at the crest of the East Pacific Rise at 21°N in 19791,2 confirmed that the formation |  | | 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;...seawater. The metal sulphides including pyrite, sphalerite, and chalcopyrite eventually accumulate at and...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 |  | | 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...seawater oxidation and a late stage marcasite-sphalerite-galena-barite assemblage. ~,34Svaries along the...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 |  | 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 37âN on the Mid-Atlantic Ridge C. Langmuir â,*, S. Humphris b, D. Fornari b, C...Fisheries â Department â Deportment Geophysics. and Ocean Sciences, University Unkersi&. Palisades, Institution...km long ridge segment near 37âN 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; |  | 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 |  | Badrzadeh, Zahra, Barrett, Timothy J., Peter, Jan M., Gimeno, Domingo, Sabzehei, Mossaieb, Aghazadeh, Mehraj (2011) Geology, mineralogy, and sulfur isotope geochemistry of the Sargaz CuâZn volcanogenic massive sulfide deposit, SanandajâSirjan Zone, Iran. Mineralium Deposita, 46 (8) 905-923 doi:10.1007/s00126-011-0357-4 | Journal (article/letter/editorial) | | chalcopyrite-rich central part, and a sphaleriteâchalcopyrite-rich upper part, with a sphalerite-rich zone lateral to...mineral is pyrite, with lesser chalcopyrite and sphalerite. The feeder zone, comprised of a vein stockwork...relationships, the growth history of the Sargaz deposit is complex and includes: (1) early precipitation of sulfides...precipitation of fine-grained anhedral pyrite, sphalerite, quartz, and barite; (2) anhydrite precipitation...clasts and precipitation of coarse-grained pyrite, sphalerite, tetrahedriteâtennantite, galena and barite; |  | | Journal (article/letter/editorial) | | Middle Valley Sulfide Deposits, Northern Juan de Fuca Ridge: Radiogenic Isotope Systematics T. BJERKGĂ
RD...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 â Corresponding author: e-mail...Goodfellow and Blaise, 1988) and has been drilled by the Ocean Drilling Program on two occasions, during Leg 139 |  | | Journal (article/letter/editorial) | | rom Sulfide Mineralogy and the Compositionof Sphalerite M.D. HANNINGTON* AND S. D. SCOTT Departmentof...sulfidemineralequilibriaandthe FeScontentsin sphalerite froma varietyof deposits indicatesthatgolden...molepercentFeSup to 6.7 ppmAu in sulfides with sphalerite containing<10 molepercentFeS. Fluid inclusions...formed at 200 Ăž to 300ĂžC typically containFe-poor sphalerite(<1 mole % FeS)andgoldgradesof i to 3 ppmAu, ...whereasCu-richoresformedat >300ĂžC containFerich sphalerite(1-5 mole% FeS)andgoldgrades< i ppmAu. ArcheanCu-Zndepositsat |  | 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) | | carbonate with minor amounts of chalcopyrite, sphalerite and galena, Stage 2B veins with abundant base...crystalline barite with variable amounts of pyrite, sphalerite, galena and carbonate. Stages 3 - 6 veins are...quartz crystals or within colour banding of zoned sphalerite. These inclusions are 10-15 /zm in size, and...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 |  | | Journal (article/letter/editorial) | | Valley massive sulphide deposit, northern Juan de Fuca Ridge: Pb isotope constraints Finlay M. Stuart... Scottish UniĂersities 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...local nature of hydrothermal circulation at mid-ocean ridges. The 3 Her4 He of hydrothermal fluids in |  | | 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 |  | | Journal (article/letter/editorial) | | equencein the central NorwegianCaledonides,just east of the major (25+ million metric tons)orebodyat...of fine-grainedcolloformpyrite (+ chalcopyrite,sphalerite,and galena)deposition succeeded anearlierphasein...interest since it contains several massive sulfide de- one of severalophiolitefragmentsin the western positswhichare...Jasper/'Vasskis' hor,zons âą Volcanic complex -<-,âą Plutonit complex Strikeanddipof layec,ncj,myerted... and more moderate, northerly dips in the little de- Deposit geology formed southernparts which host |  | 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...Although Type I inclusions are found in quartz, sphalerite, and barite, workable fluid inclusions are only...end-member vent fluids from 21jN, East Pacific Rise, Guaymas Basin, Explorer Ridge and present-day sea water...growth zoning in quartz and colour banding in sphalerite). Negative crystal shape or isolated, solitary...end-member vent fluids from 21jN, East Pacific Rise, Guaymas Basin, Explorer Ridge and present-day sea water |  | | Journal (article/letter/editorial) | | (1) ppm (n = 103). Chimney samples dominated by sphalerite, barite and chalcopyrite have significantly higher...in tennantite associated with chalcopyrite and sphalerite. A high activity of sulfur is indicated for the...sulfide assemblages, the low iron content of sphalerite (average = 2.3 ± 3 mole % FeS), and the silver-poor...complexes of gold indicates that AuHS° is the dominant complex, which is consistent with the high activity of...experimental data, AuHS° is the dominant complex up to 325°C. This complex thus is the only one required for |  | | Journal (article/letter/editorial) | | Precipitation of gold during conductive cooling of mid-ocean ridge black smoker (MOR) fluids occurs at low temperatures...In this case, the lower stability of the AuHS° complex at low ÆO2 (buffered by fayalite, magnetite, and...with early bornite and chalcopyrite and before sphalerite and silver, producing a high-temperature CuâAu...temperatures, after the precipitation of chalcopyrite, sphalerite, and galena, resulting in Au-poor polymetallic...cooling, gold precipitates at about 160 °C with sphalerite, tennantite, silver, and galena, resulting in |  | | Report (volume) | | and Biologic Studies at Escanaba Trough, Gorda Ridge, Offshore Northern California JANET L. MORTON, ROBERT...and biologic studies at Escanaba Trough, Gorda Ridge, offshore northern California I Janet L. Morton...the SESCA area, Escanaba Trough, southern Gorda Ridge ................................. 131 Robert E....hydrothermal fluids from Escanaba Trough, Gorda Ridge ..................................................massive sulfide formation in Escanaba Trough, Gorda Ridge: The importance of seawater mixing and magnesium |  | | 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) | | VMS deposit: TAG hydrothermal mound, Mid-Atlantic Ridge, 26°°N Received: 16 November 1998 / Accepted: 19...Mid-Atlantic Ridge provided the Âźrst insights into the third dimension of a volcanichosted massive sulÂźde (VMS)...(VMS) deposit on a sediment-free mid-ocean ridge. SulÂźde precipitation at this site started at least 20...siliciÂźed stockwork complex containing approximately 3.9 million tonnes of sulÂźde-bearing material with...mineralogical and isotopic zonation as well as a complex assemblage of sulÂźde-anhydrite-quartz bearing breccias can |
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