 | 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 |  | | 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 (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 |  | 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 |  | 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...chimneys. The low solubility of Au as a bisulfide complex and the absence of fluid mixing during this stage...that gold was effectively scavenged from the Escanaba trough vent fluids by coexisting droplets of liquid...of hydrothermal fluids with sediment in the Escanaba trough. In contrast, the absence of the Au-Bi association |  | | Journal (article/letter/editorial) | | smectite and chlorite groups (McMurtry and Yeh, 1981; De Carlo et al., 1983; McMurtry et al., 1983; 1993;...the ridge-transform intersection between the St. Paul Fracture Zone (FZ) and Intra-Transform Ridge Segment...Segment “A” at the Mid-Atlantic Ridge (D'Orazio et al., 2004). The sample was dredged from the summit area...on the southern summit bench of the Red Seamount, a tholeiitic off-axial seamount at 21°N East Pacific...Pacific Rise (EPR) (Alt et al., 1987). Samples from basalt-hosted sediment-covered hydrothermal systems were |  | | 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) | | S0016-7037(01)00660-3 Metal mobility in sediment-covered ridge-crest hydrothermal systems: Experimental and theoretical...sedimentary organic matter blanketing midocean ridge crests has a potentially strong impact on metal...hemipelagic mud from Middle Valley, northern Juan de Fuca Ridge, with seawater and a Na-Ca-K-Cl fluid of...Basin, Gulf of California, and Escanaba Trough, southern Juan de Fuca Ridge, large sulfide deposits are...oceanic spreading centers. Hydrothermal activity in ridge-crest environments characterized by low sedimentation |  | 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 |  | 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 |  | 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...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 |  | | 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...galena, the principal minerals, are accompanied by pyrite, marcasite, chalcopyrite, Sb- and As-fahlore, barite |  | 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) | | 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 (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 |  | Chen, Chen-Tung Arthur, Zeng, Zhigang, Kuo, Fu-Wen, Yang, Tsanyao Frank, Wang, Bing-Jye, Tu, Yueh-Yuan (2005) Tide-influenced acidic hydrothermal system offshore NE Taiwan. Chemical Geology, 224 (1) 69-81 doi:10.1016/j.chemgeo.2005.07.022 | Journal (article/letter/editorial) | | 1 km east of Kueishantao islet, at 121855VE, 24850VN, near the southern end of the Okinawa Trough (Fig...69–81 Fig. 1. Map showing (a) Taiwan and Okinawa Trough, (b) the tectonic setting of Kueishantao islet...diamonds indicate low temperature vents. The Okinawa Trough is the backarc basin of the Ryukyu subduction zone...2001). The Okinawa Trough shoals and narrows down westwards near Taiwan to the east of the Ilan Plain...situated near the axial center of the southern Okinawa Trough. The northern seismic belt extends to Kueishantao |  | | Journal (article/letter/editorial) | | sulfate-rich seawater at the seafloor. Formation of pyrite and removal of Mg from the solid phases are also...hydrothermally altered surface sediments in the Escanaba Trough has been described by GIESKES et al. ( 1988...California; in the Escanaba Trough, Gorda Ridge; and in the Middle Valley, Juan de Fuca Ridge, where recent...FIG. I. Map of the hydrothermal area of the southern trough of the Guaymas Basin showing the location of...northern hydrothermal field of the Guaymas Basin Southern Trough (STOUT and CAMPBELL, 1983). 3) The constituents |  | Mills, R.A., Thomson, J., Elderfield, H., Hinton, R.W., Hyslop, E. (1994) Uranium enrichment in metalliferous sediments from the Mid-Atlantic Ridge. Earth and Planetary Science Letters, 124 (1) 35-47 doi:10.1016/0012-821x(94)00083-2 | Journal (article/letter/editorial) | | in metalliferous sediments from the Mid-Atlantic Ridge R.A. Mills a, J. Thomson b, H. Elderfield ‘, R...Previous studies of metal-rich sediments at mid-ocean ridge spreading centres have suggested that U/Fe ratios...to site. A suite of cores from the Mid-Atlantic Ridge has been analysed for U and Fe content and most...apparently only during oxidative alteration of pyrite phases. Fission track registration has demonstrated...sediments have been observed throughout the mid-ocean ridge system [l-4], provide an areally important sink |  | | 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 |  | 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) | | 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...high fO2-fS2 states consistent with the bornite-pyrite-chalcopyrite assemblages. These redox conditions...Redox calculations at 350°C indicate that neither pyrite nor pyrrhotite is stable in the initial hot fluids...fluids of the TAG and ultramafic-hosted Mid-Atlantic Ridge systems due to the low H2S concentrations. With |  | | Report (chapter) | | fossils are preserved mainly as external moulds of pyrite, which is consistent with biomineralization processes...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 " ° [ / ~(~ |  | Baumberger, Tamara, Früh-Green, Gretchen L., Thorseth, Ingunn H., Lilley, Marvin D., Hamelin, Cédric, Bernasconi, Stefano M., Okland, Ingeborg E., Pedersen, Rolf B. (2016) Fluid composition of the sediment-influenced Loki’s Castle vent field at the ultra-slow spreading Arctic Mid-Ocean Ridge. Geochimica et Cosmochimica Acta, 187. 156-178 doi:10.1016/j.gca.2016.05.017 | Journal (article/letter/editorial) | | field at the ultra-slow spreading Arctic Mid-Ocean Ridge Tamara Baumberger a,b,⇑, Gretchen L. Früh-Green...(73°N) of the ultraslow spreading Arctic Mid-Ocean Ridge (AMOR) close to the Bear Island sediment fan...axial volcanic ridge. Even though the active chimneys have grown on a basaltic ridge, geochemical fluid...relevant in areas where the active Arctic Mid-Ocean Ridge system is in contact with the organic matter...Keywords: Loki’s castle; Arctic mid-ocean ridges; Ultra-slow spreading ridge; Hydrothermal fluids; Sediment-influenced; |  | | 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 |
|
