Juan de Fuca ridge

Rathgeber C, N Yurkova, E Stackebrandt, JT Beatty, V Yurkov (2002) Isolation of tellurite and selenite-resistant bacteria from hydrothermal vents of the Juan de Fuca Ridge in the Pacific Ocean. Appl Environ Microbiol 68 4613-4622. 

Name of its Juan ce pjca Ridge J jan de Fuca Ridge Juan de Fuca Ridge Juan ds Fuca Ridge... 

Phase separation and segregation are occurring in some hydrothermal systems (Gamo, 1995) which modify the chemistry of initial hydrothermal solution. Von Damm and Bischoff (1987) and Butterfield et al. (1994) obtained high chloride concentration of more than twice of the seawater value for the hydrothermal solution at the North Cleft Segment and the South Cleft Segment of the Juan de Fuca Ridge. 

Low chloride concentrations of hydrothermal solutions were obtained from North Fiji Basin (Grimaud et al., 1991) and the Endeavour Segment of the Juan de Fuca Ridge (Butterfield et al, 1994). This wide variation in chloride concentration could be explained in terms of gas-liquid separation at the shallow part from the seafloor (Von Damm and Bischoff, 1987 Von Damm, 1988 Cowan and Cann, 1988). 

A few studies on grain size of minerals in midoceanic ridge chimneys have been published. Feely et al. (1987) described the grain size of mineral particles in the smoke and sediment samples from southern Juan de Fuca Ridge. They report the following grain sizes sphalerite 0.3-100 p.m in diameter (usually less than 20 p.m) pyrite 0.1-10 p.m Fe-Si, Ca-Si phases 5-150 p.m. Converse et al. (1984) reported the grain size... 

Bischoff, J.L., Rosenbauer, R.J., Aruscavage, P.J., Baedecker, A.L. and Crock, J.G. (1983) Seafloor massive sulfide deposits from 2I°N, East Pacific Rise Juan de Fuca Ridge and Galapagos rift Bulk chemical composition and economic implications. Econ. Geo ., 78, I711-1720. 

Butterfield, V.A., McDuff, R.E., Franklin, J. and Wheat, C.G. (1994) Geochemistry of hydrothermal vent fluids from Middle Valley, Juan de Fuca Ridge. In Mottl, M.J., Davis, E.E., Fi.sher, A.T. and Slack, J.F. (eds.). Proceedings of the Ocean Drilling Program. Sci. Proc., 139, 395-410. 

Goodfellow, W.D. and Blaise, B. (1988) Sulfide formation and hydrothermal alteration of hemipelagic sediment in Middle Valley, northern Juan de Fuca Ridge. Can. Mineral, 26, 675-696. 

Hannington, M.D. and Scott, S.D. (1988) Mineralogy and geochemistry of a hydrothermal silica-sulfide-sulfate spire in the caldera of Axial Seamount, Juan de Fuca Ridge. Can. Mineral., 26, 603-624. 

Koski, R.A., Normark, W.R., Morton, J.L. and Delaney, Jr. (1982) Metal sulfide deposits on the Juan de Fuca Ridge. Oceanus, 25, 42-48. 

Tivey, M.K. and Delaney, J.R. (1986) Growth of large sulfide structures on the Endeavour segment of the Juan de Fuca Ridge. Earth Planet. Sci. Lett., 77, 303-317. 

Von Damm, K.L. and Bischoff, J.L. (1987) Chemistry of hydrothermal solutions from the southern Juan de Fuca Ridge. J. Geophys. Res., 93B, 11334-11346. 

Eaby JS, Clague DA, Delaney JR (1984) Sr isotopic variations along the Juan de Fuca Ridge. J Geophys... 

Elderfleld H, Wheat CG, Mottl MJ, Monnin C, Spiro B (1999) Fluid and geochemical transport through ocean crust a transect across the eastern flank of the Juan de Fuca Ridge. Earth Planet Sci Lett 172 151-165 Elliott T, Thomas A, Jeffcoate AB, Niu Y (2003) Li isotope composition of the upper mantle. EOS Trans, Am Geophys Union 84 1608... 

Foustoukos DI, James RH, Seyfried Jr WE (2003) Lithium isotopic systematics of the Main Endeavor Field vent fluids. Northern Juan de Fuca Ridge. Geochim Cosmochim Acta 67 A101 Franklin KJ, Halliday JD, Plante LM, Symons EA (1986) Measurement of the Li-6 Li-7 isotope ratio for lithium-salts hy FT NMR-spectroscopy. J Magnet Resonance 67 162-165 Fritz SJ (1992) Measuring the ratio of aqueous diliusion coefficients between Li Ck and Li Cf by osmometry. Geochim Cosmochim Acta 56 3781-3789... 

Sharma M, Polizzotto M, Anbar AD (2001) Iron isotopes in hot springs along the Juan de Fuca Ridge. Earth Planet Sci Lett 194 39-51... 

Rushdi Al, Simoneit BRT, Hydrothermal alteration of organic matter in sediments of the Northeastern Pacific Ocean Part 1. Middle Valley, Juan de Fuca Ridge, Appl Geochem 17 1401—1428, 2002. 

Knecht. R.W. Introduction Deep Ocean Mining, Oceanus, 3-11 (Fall 1982). Koski, RA, et al. Metal Sulfide Deposits on the Juan de Fuca Ridge. Oceanus, 42 -46 (Fall 1982). 

Lupton, J. E., Baker, E. T., Massoth, G. J. (1989) Variable 3He/heat ratios in submarine hydrothermal systems Evidence from two plumes over the Juan de Fuca ridge. Nature, 337, 161-4. 

Mehta, M. P., Butterfield, D. A., and Baross, J. A. (2003). Phylogenetic diversity of nitrogenase (nifH) genes in deep-sea and hydrothermal vent environments of the Juan de Fuca ridge. Appl. Environ. 

Dixon J. E., Stolper E., and Delaney J. R. (1988) Infrared spectroscopic measurements of CO2 and H2O in Juan de Fuca Ridge basaltic glasses. Earth Planet. Sci. Lett. 90, 87-104. 

Karsten J. L., Delaney J. R., Rhodes J. M., and Liias R. A. (1990) Spatial and temporal evolution of magmatic systems beneath the Endeavour Segment, Juan de Fuca Ridge Tectonic and petrologic constraints. J. Geophys. Res. 95, 19235-19256. 

McClain K. J. and Lewis B. T. R. (1982) Geophysical evidence for the absence of a crustal magma chamber under the northern Juan de Fuca Ridge a contrast with ROSE results. J. Geophys. Res. 87, 8477-8489. 

Sours-Page R., Johnson K. T. M., Nielsen R. L., and Karsten J. L. (1999) Local and regional variation of MORE parent magmas evidence from melt inclusions from the Endeavour Segment of the Juan de Fuca Ridge. Contrib. Mineral. Petrol. 134, 342-363. 

Chadwick W. W., Embley R. W., and Fox C. G. (1991) Evidence for volcanic-eruption on the Southern Juan-De-Fuca Ridge between 1981 and 1987. Nature 350, 416-418. 

Figure 6 Wt.% Na20 versus other major-element oxides, in wt.%, plus molar Ca/(Ca+Na) versus ppm Ti/Zr, for primitive arc lavas (Mg > 60). Many of these plots clearly show distinct compositional fields for primitive basalts, primitive andesites, and boninites. While most of the primitive andesites are from continental arcs, they plot together with western Aleutian primitive andesites, which are from an intra-oceanic arc and have MORB-like Sr, Pb, and Nd isotope ratios. Thus, assimilation of older, continental material is not essential to producing the distinctive composition of primitive andesites. Large filled circles show values for average MORE glasses from the East Pacific Rise, Juan de Fuca Ridge, and Indian Ocean. Other symbols and data as for Figure 1.

Baker E. T., Massoth G. J., Feely R. A., Embley R. W., Thomson R. E., and Burd B. J. (1995) Hydrothermal event plumes from the CoAxial seafloor eruption site, Juan de Fuca ridge. Geophys. Res. Lett. 22, 147-150. 

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