 | | 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 |  | | 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 |  | Von Damm, K.L., Parker, C.M., Zierenberg, R.A., Lilley, M.D., Olson, E.J., Clague, D.A., McClain, J.S. (2005) The Escanaba Trough, Gorda Ridge hydrothermal system: Temporal stability and subseafloor complexity. Geochimica et Cosmochimica Acta, 69 (21) 4971-4984 doi:10.1016/j.gca.2005.04.018 | Journal (article/letter/editorial) | | doi:10.1016/j.gca.2005.04.018 The Escanaba Trough, Gorda Ridge hydrothermal system: Temporal stability... OLSON,3 D. A. CLAGUE,4 and J. S. MCCLAIN2 1 Complex Systems Research Center, Institute for the Study...from the active hydrothermal system in Escanaba Trough, Gorda Ridge in 2000 and 2002 remain unchanged from...chemistry of the hydrothermal system are much more complex within the sediment cover than would be expected...whether the system had evolved since 1988. Escanaba Trough is one of only four active hydrothermal systems |  | 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 |  | 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) | | Pyrrhotite-Rich Massive Sulfide Deposits, Escanaba Trough, Southern Gorda Ridge TUOMO O. TÖRMÄNEN* Institute of...sediment-covered floor of the Escanaba trough, the slow-spreading, southernmost segment of Gorda Ridge. These concentrations...amounts of isocubanite, chalcopyrite, and Fe-rich sphalerite were formed by high-temperature (estimated range...deposition of pyrrhotite, Cu-Fe sulfides, and sphalerite waned, a volumetrically minor suite of sulfarsenide...chimneys. The low solubility of Au as a bisulfide complex and the absence of fluid mixing during this stage |  | Bogdanova, O. Yu., Lein, A. Yu., Dara, O. M., Ozhogina, E. G., Lisitzin, A. P. (2016) Pyrrhotite mineralization as a search criterion for sulfide deposits at sediment-covered spreading centers. Doklady Earth Sciences, 470 (1) 928-932 doi:10.1134/s1028334x16090038 | Journal (article/letter/editorial) | | hydrothermal vents of the Hydrothermal Hills in the Southern Trough of the Guaymas depression were studied. A series...1134/S1028334X16090038 By the northern course of the East Pacific Rise (EPR), three sulfide deposits were found on...part of Juan de Fuca Ridge (Middle Valley), and in the Escanaba Trough (the southern part of Gorda Ridge)...Bessy type, e.g., in the Sanbagawa metamorphic complex (Japan) [5]. In the course of this study, the authors...hydrothermal vents from the Hydrothermal Hill (the Southern Trough of the Guaymas depression) of the collection |  | 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) | | pyrrhotitewith lessabundantisocubanite,chalcopyrite,sphalerite,arsenopyrite,and mamasite.Barite-richand polymetallic...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 |  | 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) | | the southeastern part of Kerman Province, in the southern Sanandaj–Sirjan Zone of Iran. The stratigraphic...chalcopyrite-rich central part, and a sphalerite–chalcopyrite-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 |  | | Journal (article/letter/editorial) | | hydrothermal JADE field in the Okinawa back-arc trough Received: 5 October 1995 / Accepted: 10 May 1996...isotope signatures of VMS-type deposits at mid-ocean ridges is distinctly different. In the absence of...The JADE field is located in the Okinawa back-arc trough, which extends from Kyushu to Taiwan (Fig. 1)....km in the NE (Kimura 1985). The central Okinawa trough consists of several segments which are aligned...between 1300 and 1500 m are depicted in Fig. 2. Sphalerite and galena, the principal minerals, are accompanied |  | | 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 |  | | 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) | | 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 |  | | Journal (article/letter/editorial) | | various geological settings, including the Okinawa Trough (sediment-rich Hakurei and sediment-poor NU Jade...Vienna MA Woods fields), and the Central Indian Ridge (mafic/ultramafic-hosted Kairei and basalt-hosted...primary mineral assemblages and FeS contents in sphalerite/wurtzite. This correlation TE suggests that...fluids of the TAG and ultramafic-hosted Mid-Atlantic Ridge systems due to the low H2S concentrations. With...(e.g., Seewald et al., 2003; Takai et al., 2008; de Ronde et al., 2011; Reeves et al., 2011). NU Assuming |  | 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 |  | | Journal (article/letter/editorial) | | Sediment-covered spreading ridge Guaymas Basin, Escanaba Trough, Middle Valley, Red Sea Mid-Ocean ridge (no sediment)...sediment) East Pacific Rise, Mid-Atlantic Ridge warm up to -350°C Off-axis systems (flanks and basins) ...2% organic carbon. Numerous hydrothermal mounds rise to 2030 m above the south rift floor, and most are...and BECKER, 1985). The mounds are composed of complex deposits of sulfide, sulfate, silicate and carbonate...in the system (>3OO”C). The Escanaba Trough in the northeastern Pacific (Fig. 1) is an active oceanic |  | | Journal (article/letter/editorial) | | Environmental Sciences Division, Oak Ridge N ational Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6036 INTRODUCTION...be a relatively common phenomenon on the world ridge-crest system. It is a consequence of the emplacement...extending from the ridge axes (zero crustal age) to several thousand kilometers away on the ridge flank� (crustal...rates, at sediment-covered and sediment-starved ridge axes, and at temperatures ranging from just a few...systems. Not (21 °24'N, 38°03'E) and the Mariana Trough ( 1 8° 1 3'N, 144°4 1'E). shown are the Red Sea |  | | Report (chapter) | | sites (discussed later), and how little Phanerozoic ocean floor has been obducted, without major metamorphism...environment of formation was different to the mid-ocean ridge and arc settings of VMS deposits. LITTLE, C...communities. In. MILLS,R. A. & HARRISON, K. (eds) Modern Ocean Floor Processes and the Geological Record, Geological...K/P: P (K;T) ~ - ~ ( ~ ' ) Ocean system: I y. ° U = Uralian, P = Pacific, T = Tethys J " ° [ / ~(~ ...fossiliferous VMS deposits. Ages of the deposits and the ocean system in which they formed in brackets. P = Palaeocene |  | | Journal (article/letter/editorial) | | and lead in mid-ocean ridge basalts and the source rock control on Zn/Pb in ocean-ridge hydrothermal deposits...Pb in mid-ocean ridge basalts (MORB) and the MORB sourcerock control on Zn/Pb in ocean-ridge hydrothermal...The values of Zn, Cu, and Pb for submarine mid-ocean ridge basalts (MORB) are, respectively (in ppm): average...Valley, Juan de Fuca Ridge (JFR)-87, 64, and 0.5; southern JFR-120 and 0.5; and 2 1“N, East Pacific Rise...compatible element, particularly along the Mid-Atlantic Ridge, a behavior presumably due to separation of sulfides |  | | 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 |  | | Report (issue) | | Mapping and Research: Working Together in the Pacific EEZ U.S. GEOLOGICAL SURVEY CIRCULAR 1092 AVAILABILITY...Mapping and Research: Working Together in the Pacific EEZ MILLINGTON LOCKWOOD, National Oceanic and Atmospheric...Mapping and Research : working together in the Pacific EEZ I Millington Lockwood and Bonnie A. McGregor...Includes bibliographical references. 1. Ocean bottom-Pacific Coast (U.S.)-Maps-Congresses. I. Lockwood...Program-Challenges and Choices John Carey 9 Mapping the Ocean Floor from the DMA-Defense Hydrographic Initiative |  | | Report (chapter) | | the TAG and MARK sites (1986, 1990) Mid-Atlantic Ridge: a new solution chemistry model and a mechanism...TAG and M A R K sites (1986, 1990) Mid-Atlantic Ridge: a new solution chemistry model and a mechanism...hot springs at TAG and MARK on the Mid-Atlantic Ridge have been resampled after an interval of four years...stability as observed elsewhere, e.g. 21~ East Pacific Rise (EPR) and the Guaymas Basin. Although the...from those on the faster spreading ridges of the Pacific, TAG has pronounced differences. The depletion |  | | 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 ƒO2 (buffered by fayalite, magnetite, and...with early bornite and chalcopyrite and before sphalerite and silver, producing a high-temperature Cu–Au...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 (chapter) | | spreading ridge Guaymas Basin, Escanaba Trough, Middle Valley, Red Sea Warm up to c. 400° C Mid-Ocean ridge...Off-axis flanks and basins Back-arc East Pacific Rise, MidAtlantic Ridge Warm up to c. 350° C Bransfield...determined gravimetrically. GB, Guaymas Basin; ET, Escanaba Trough; MV, Middle Valley. Typical conventional petroleum...(Curray et al. 1982). Numerous hydrothermal mounds rise to 20-30 m above the south rift floor, and most...Lonsdale & Becker 1985). The mounds are composed of complex deposits of sulphide, sulphate, silicate and carbonate |  | | Report (issue) | | Mineralogy of Sand in Turbidites from Escanaba Trough, Northeast Pacific Ocean by Florence L. Wong1 Open-File... MINERALOGY OF SAND IN TURBIDITES FROM ESCANABA TROUGH, NORTHEAST PACIFIC OCEAN Florence L. Wong U.S. Geological...Park, California INTRODUCTION The Escanaba Trough, southern Gorda Ridge, is a seafloor spreading center...susceptibility data on sediment cores from Escanaba Trough have placed the Holocene/Pleistocene boundary...detected on terraces uplifted on either side of Escanaba Trough as well as locally elevated sediment hills |
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