 | | Journal (article/letter/editorial) | | 194 www.elsevier.com/locate/chemgeo Deposition of talc — kerolite–smectite — smectite at seafloor hydrothermal...accepted 21 October 2007 Editor: D. Rickard Abstract Talc, kerolite–smectite, smectite, chlorite–smectite...hydrothermal sites have previously been described as talc, stevensite or saponite. In contrast, new data show...tri-octahedral Mg-phyllosilicates ranging from pure talc and Fe-rich talc, through kerolite-rich kerolite–smectite...perfection of the clay sequence decreases generally from talc to kerolite–smectite with lower crystalline perfection |  | | Report (volume) | | massive sulfide mound in the NESCA area in the Escanaba Trough , offshore of northern California, depth 3232...Hydrothermal, and Biologic Studies at Escanaba Trough, Gorda Ridge, Offshore Northern California JANET...hydrothermal, and biologic studies at Escanaba Trough, Gorda Ridge, offshore northern California I Janet...references. 1. Geology-Escanaba Trough. 2. Hydrothermal vents-Escanaba Trough. 3. Hydrothermal vent faunaEscanaba...faunaEscanaba Trough. 4. Escanaba Trough. I. Morton, Janet L. II. Zierenberg, Robert A. III. Reiss, Carol |  | 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) | | Geological, 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...coast of northern California and southern Oregon (Figure 1). The ridge consists of three segments of ridgecrest...the ridge at about 42°N. The entire Gorda Ridge is only about 160 n. miles long and the southern 50 n...miles of the ridge is covered by turbidites. This section is called the Escanaba Trough. Morphologically |  | German, C.R., Barreiro, B.A., Higgs, N.C., Nelsen, T.A., Ludford, E.M., Palmer, M.R. (1995) Seawater-metasomatism in hydrothermal sediments (Escanaba Trough, northeast Pacific) Chemical Geology, 119 (1) 175-190 doi:10.1016/0009-2541(94)00052-a | Journal (article/letter/editorial) | | Mydrothermall sediments from the NESCA vent-field, Escanaba Trough, are enriched in a 11 er of t Cd “vent-fluid”...high-temperature vent-fluids, are aiso observed in the Escanaba Trough sediments, however. Enrichments of these elements...sediment. Pb, Sr and Nd isotope distributions for the Escanaba sediments are consistent with combined sediment-fluid...unreacted seawater. The Escanaba Trough forms the sout I30 km of the Gorda Ridge, immediately north of...95001. NIGE Contribution No. This segment of the ridge is slow spreading 42.3 cm yr-’ full spreading rate; |  | | Report (chapter) | | sulphide deposits at the Middle Valley and Escanaba Trough spreading centres: ODP Leg 169 R. H. J A M...drilled during Ocean Drilling Program Leg 169 at two locations along the Juan de Fuca/Gorda spreading centres...impregnations and cross-cutting copper-rich veins. Ridge-parallel normal faulting is probably involved in...recovered from the Central Hill hydrothermal site, Escanaba Trough, suggests mineralization forms only a thin...formation of a large ore deposit in this area. Ocean Drilling Program (ODP) Leg 169 was the second leg |  | | Report (issue) | | SULFIDE SAMPLES DREDGED IN 1986 FROM ESCANABA TROUGH, SOUTHERN GORDA RIDGE Laura M. Benninger1 Randolph A...dredged in 1986 from Escanaba Trough, the sediment-covered southern end of Gorda Ridge (Figure 1). The dredge...characteristics of two locations in Escanaba Trough were investigated: the southern or SESCA site at 40°45'N latitude...seismic-reflection and photographic survey in Escanaba Trough (Morton et al., 1987b). Volcanic edifices that...gravity core and water column sampling in Escanaba Trough, are reported in Morton et al., 1987b. High |  | Zierenberg, R.A., Schiffman, P., Jonasson, I.R., Tosdal, R., Pickthorn, W., McClain, J. (1995) Alteration of basalt hyaloclastite at the off-axis Sea Cliff hydrothermal field, Gorda Ridge. Chemical Geology, 126 (2) 77-99 doi:10.1016/0009-2541(95)00111-2 | Journal (article/letter/editorial) | | at the off-axis Sea Cliff hydrothermal field, Gorda Ridge R.A. Zierenberg a**,P. Schiffman b, I.R. Jonasson...segment of the Gorda Ridge is situated along a rift-bounding normal fault abut 2.6 km east of the neovolcanic...1. Introduction 1.1. Geologic setting The Gorda Ridge spreading center is bounded on the north by the...SSDIOOO9-2541(95100111-5 third of the Gorda Ridge is a continuous second-order ridge segment (Macdonald et al.,...1987). Although the northern segment of the Gorda Ridge has a full spreading rate of 55 mm/yr (Riddihough |  | Lackschewitz, K. S., Singer, A., Botz, R., Garbe-Schonberg, D., Stoffers, P., Horz, K. (2000) Formation and Transformation of Clay Minerals in the Hydrothermal Deposits of Middle Valley, Juan de Fuca Ridge, ODP Leg 169. Economic Geology, 95 (2) 361-389 doi:10.2113/gsecongeo.95.2.361 | Journal (article/letter/editorial) | | the Hydrothermal Deposits of Middle Valley, Juan de Fuca Ridge, ODP Leg 169 K. S. LACKSCHEWITZ,†,* Institut...chemical, and isotopic characteristics of clays from Ocean Drilling Program (ODP) sites 1035, 856, 1036, and...Middle Valley at the northern end of the Juan de Fuca Ridge during Legs 139 and 169, were studied using...of hole 856H near the southernmost peak of the Ocean Drilling Program mound. At both holes, the clay...Mineralogical data from hole 1035D, drilled 75 m east of hole 856H, and hole 1035A, drilled 77 m west |  | | 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...local nature of hydrothermal circulation at mid-ocean ridges. The 3 Her4 He of hydrothermal fluids in |  | Zierenberg, Robert A., Koski, Randolph A., Morton, Janet L., Bouse, Robin M. (1993) Genesis of massive sulfide deposits on a sediment-covered spreading center, Escanaba Trough, southern Gorda Ridge. Economic Geology, 88 (8) 2069-2098 doi:10.2113/gsecongeo.88.8.2069 | Journal (article/letter/editorial) | | averagingmorethan1 g/t Au. Massivesulfidefromthe Escanaba troughis enrichedin groupIV, V, andVI elementsrelativeto...ZIERENBERG ET AL. die Valley (northernJuande Fuca Ridge),and the cino fracture zone on the south and...approxiaboutthe tectonicsettingsand the natureof ore- Escanaba formingprocesses inancientpalcorift,sediment-dom-...inantenvironments. Data fromthe Escanaba trough, hough,1980; Wilson,1989). The Escanaba consistent with the slow-spreading...intersection Escanabatrough, the sediment-covered southern- with the Mendocino fracture zone. Southof 41ø17'N |  | | 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 |  | | Journal (article/letter/editorial) | | an active vent field, northern Juan de Fuca Ridge, northeast Pacific John D. Adshead Mineral Technology...active vent field in Middle Valley on northern Juan de Fuca Ridge is preserved in a core taken on the margin...1985; Peter and Scott, 1988), the Escanaba Trough, northeastern Pacific (Morton et al., 1987; Koski et al...Middle Valley on the northern Juan de Fuca Ridge, northeastern Pacific (Davis et al., 1987; Ames et al...valley of the Gal~ipagos Rift, eastern central Pacific, where mound growth appears to result entirely |  | Morton, J.L., Normark, W.R., Ross, Stephanie L., Koski, R.A., Holmes, M.L., Shanks, Wayne C., Zierenberg, R.A., Lyle, M.W., Benninger, L.M. (1987) Preliminary report, cruises L1-86-NC and L2-86-NC, Escanaba Trough, Gorda Ridge. Open-File Report Vol. 1987 (87-375) US Geological Survey doi:10.3133/ofr87375a | Report (issue) | | report, cruises L1-86-NC and L2-86-NC, Escanaba Trough, Gorda Ridge Janet L. Morton , William R. Normark...sampled at the sediment-covered Escanaba Trough, southern Gorda Ridge, during S.P. Lee cruises L1-86-NC...within the sedimentary fill along the axis of Escanaba Trough. The sulfide and other hydrothermal minerals...depth. INTRODUCTION Gorda Ridge is located in the northeast Pacific Ocean 200 to 300 km west of northern...California and southern Oregon, within the U.S. Exclusive Economic Zone (EEZ). Escanaba Trough comprises the |  | Gablina, I. F., Popova, E. A., Sadchikova, T. A., Savichev, A. T., Gor’kova, N. V., Os’kina, N. S., Khusid, T. A. (2014) Hydrothermal metasomatic alteration of carbonate bottom sediments in the Ashadze-1 field (13° N Mid-Atlantic Ridge) Geology of Ore Deposits, 56 (5) 357-379 doi:10.1134/s1075701514050043 | Journal (article/letter/editorial) | | Sediments in the Ashadze1 Field (13° N MidAtlantic Ridge) I. F. Gablinaa, E. A. Popovab, T. A. Sadchikovaa...for Geology and Mineral Resources of the World Ocean, Angliiskii pr. 1, St. Petersburg, 190121 Russia...ments from hydrothermal plumes, which form in the ocean above active hydrothermal vents. At the same time...Middle Valley of the Juan de Fuca Ridge, Escanaba Trough, etc. in the Pacific Ocean (Curray et al., 1982;...author: I.F. Gablina. Email: gablina@ilran.ru midocean ridges that are distant from continents and covered |  | | Journal (article/letter/editorial) | | Valley, Juan De Fuca Sylvie Decitrea,*, Martine Buatiera,1, Rachael Jamesb,2 a Département de Géosciences...Sciences et Techniques, Université de Franche-Comté, 16 Route de Gray F-25030 Besançon Cedex, France...the Middle Valley hydrothermal site on the Juan De Fuca Ridge. The Li content of pure detrital clays is...from Sites 855 through 858, Middle valley, Juan De Fuca Ridge. In Mottl, M.J., Davis, E.E., Fisher, A.T...Elsevier B.V. All rights reserved. Keywords: Juan de Fuca Ridge; ODP Leg 139; Isotopes; Lithium; Hydrothermal |  | | Journal (article/letter/editorial) | | Valley, Juan de Fuca Ridge DAMON A. H. TEAGLE† Southampton Oceanography Centre, School of Ocean and Earth...of the bare-rock Endeavour segment of the Juan de Fuca Ridge, is host to the base metal-rich (Cu-Zn) Bent...steep-sided body ~200 m across and ~100-m-thick. Ocean Drilling Program (ODP) hole 856H penetrates through...basalts, ~0.7), that mimic profiles for midocean ridge hydrothermal fluids, require fluid-rock exchange...vents or through more diffuse leakage. In contrast, ocean crust spreading close to sources of abundant clastic |  | | Journal (article/letter/editorial) | | clay alteration at Jade in the back-arc Okinawa Trough: Mineralogy, geochemistry and isotope characteristics...kaolins (kaolinite and halloysite), Mg-rich chlorite, talc, montmorillonite, and a mixed-layer mineral of dioctahedral...1983). The Jade deposit in the central Okinawa Trough (Fig. 1-1) is con- 1. INTRODUCTION In the subsurface...1989a). 2. GEOLOGY OF THE JADE DEPOSIT The Okinawa Trough is a back-arc basin behind the Rhukyu island arc...Nagumo et al., 1986). The volcanic rocks in the trough are basalt, basaltic andesite, dacitic andesite |  | | Journal (article/letter/editorial) | | ANSCHUTZ, * GERARDBLANC,and PETERSTILLE Centre de Gkochimie de la Surface, U.P.R. 625 1 CNRS, 1, rue Bless&...forming close to the buoyant-plume systems at the mid-ocean ridges. In spite of numerous investigations, the...lower unit (Unit L) consists of anhyd&e (lo70 wt%), talc, serpentine (up to 30 wt%), and Fe-oxides (20-60...f&-ox, Gwth. Arn+CI Goeth, Am&l Am+CI. Sulf blagn, Talc, Anh Hem, Anh, An-&I SUB, AM. Carb Anh, Am+CI...Anh, Calc, Carb, Qt cart, Carb, Qz. Sulf az, talc Anh, Qz Qz, Felds Anh, Garb, Qz MlNOa MllOERALS |  | | Report (issue) | | 1987 4:00 5:00 Registration (East Lobby) Ice-breaker/Cash Bar Mixer (East Lobby) 3:20 3:40 Wednesday...southeastern Nevada (H. Richard Blank) Central San Juan caldera cluster, Colorado-New stratigraphic and...sediment-hosted hydrothermal mineral localities in Escanaba Trough, Gorda Ridge (Janet L. Morton, William R. Normark...aspects of ocean-floor hydrothermal-vent fluids and massive sulfide chimneys from the southern Juan de Fuca...Fuca Ridge 8. Chaffee, M. A., Chemical zoning of mineral deposits as an exploration technique-The Red Mountain |  | Miyoshi, Youko, Ishibashi, Jun-ichiro, Faure, Kevin, Maeto, Kotaro, Matsukura, Seiya, Omura, Akiko, Shimada, Kazuhiko, Sato, Hiroshi, Sakamoto, Takeaki, Uehara, Seiichiro, Chiba, Hitoshi, Yamanaka, Toshiro (2013) Mg-rich clay mineral formation associated with marine shallow-water hydrothermal activity in an arc volcanic caldera setting. Chemical Geology, 355. 28-44 doi:10.1016/j.chemgeo.2013.05.033 | Journal (article/letter/editorial) | | focused on basalt-hosted fields located at midocean ridge settings. In such systems, Mg-rich hydrothermal...alteration minerals. At Middle Valley in the Juan de Fuca Ridge where high-temperature fluid (T = 257–276...setting. In the JADE hydrothermal field in the Okinawa Trough, where hydrothermal activity is represented by...Mg-rich chlorite, chlorite–smectite mixed-layer, and talc were observed, as well as Al-rich hydrothermal minerals...about 13 ka during rapid post-glacial sea level rise (Yamanaka et al., 2010). At present, the outer rim |  | Melekestseva, Irina, Kotlyarov, Vasiliy, Tret’yakov, Gennadiy, Shilovskikh, Vladimir, Khvorov, Pavel, Belogub, Elena, Beltenev, Victor, Filippova, Kseniya, Sadykov, Sergey (2022) The Heavy-Metal Fingerprint of the Irinovskoe Hydrothermal Sulfide Field, 13°20′ N, Mid-Atlantic Ridge. Minerals, 12 (12) 1626 doi:10.3390/min12121626 | Journal (article/letter/editorial) | | Hydrothermal Sulfide Field, 13◦ 200 N, Mid-Atlantic Ridge Irina Melekestseva 1, *, Vasiliy Kotlyarov 1 , Gennadiy...hydrothermal sulfide field, 13◦ 200 N, Mid-Atlantic Ridge. Sulfide samples were studied using optical microscopy...sulfide fields. Field, 13◦ 200 N, Mid-Atlantic Ridge. Minerals 2022, 12, 1626. https:// doi.org/10.3390/min12121626...chimneys; hydrothermal sulfide fields; Mid-Atlantic Ridge Academic Editor: Pierfranco Lattanzi Received:...Mid-Atlantic Ridge (MAR), seafloor HSFs occur within mafic- or ultramaficrelated ridge segments and their |  | Tesalina, S.G, Nimis, P, Augé, T, Zaykov, V.V (2003) Origin of chromite in mafic–ultramafic-hosted hydrothermal massive sulfides from the Main Uralian Fault, South Urals, Russia. Lithos, 70 (1) 39-59 doi:10.1016/s0024-4937(03)00090-2 | Journal (article/letter/editorial) | | are included in the sulfides or scattered in their talc F chlorite F saponite F quartz F carbonate matrix...massive sulfides could not originate on a mid-ocean ridge, but rather in an early arc or forearc environment...sulfide-associated chromites from two VHMS deposits of the southern MUFZ. These include the Ishkinino deposit studied...significance of Fig. 1. Geological sketch map of the southern Urals, with location of the Ivanovka and Ishkinino...resulted from the Late Palaeozoic collision of the East European Platform with a Siberian –Kazakhian plate |  | | Journal (article/letter/editorial) | | Crystal chemistry of the mixed-layer sequence talc–talc-smectite–smectite from submarine hydrothermal...analysis. They are talc, smectite, and mixed-layer talc-smectite (T-S) where the talc layers have several...distributions, from random to ordered. Our sequence talc, T-S, trioctahedral smectite is defined by an increasing...disordered, hydrated talc. We find that there is no clear line delimiting talc from kerolite as a single...descriptive term for the latter such as “disordered talc.” Dioctahedral smectite is also a possible end-member |  | | Journal (article/letter/editorial) | | Journal Pre-proof Environmental controls on mid-ocean ridge hydrothermal fluxes Laurence A. Coogan, William...and N.J. Pester, Environmental controls on mid-ocean ridge hydrothermal fluxes, Chemical Geology (2019)...Pre-proof 1 Environmental controls on mid-ocean ridge hydrothermal fluxes *1Laurence A. Coogan, 2William...and 3Nicholas J. Pester 1 2 School of Earth and Ocean Sciences, University of Victoria, Victoria, Canada...re High temperature hydrothermal fluxes at mid-ocean ridges are thought to be an important component |  | | Journal (article/letter/editorial) | | resulted in the formation of the northern and southern troughs, two northeast-trending en echelon axial...new basaltic crust at oceanic spreading centem In ridge crest en~ronmen~ characterized by high sedimentation...California), Escanaba Trough (Gorda Ridge ) , and Middle Valley (northern Juan de Fuca Ridge), accumulation...accumulation of sediment at the ridge axis results in a unique style of convective hydrothermal activity involving...well-developed active hydrothermal system in the southern trough where hot-spring fluids vent at the seafloor |
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