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Sr isotopes

Kusakabe, M., Mayeda, S. and Nakamura, E. (1990) S, O and Sr isotope systematics of active vent materials from the Mariana basin spreading axis at I8°N. Earth Planet. Sci. Lett., 100, 275-282. [Pg.278]

Yoneda, T. and Shirahata, H. (1995) Acid alteration associated with Kuroko-type mineralization and Sr isotope study of hydrothermal alteration at the Minamishiraoi barite deposit, southwestern Hokkaido, Japan. Resource Geology Special Issue, 18, 203-210. [Pg.293]

Farrell and Holland (1983) cited ba,sed on Sr isotope study on anhydrite and barite in Kuroko deposits that the most appealing model for the formation of Kuroko strata-bound ores would seem to entail precipitation of the minerals from a hydrothermal solution within the discharge vent or in the interior of a hydrothermal plume formed immediately below above the vent exit in the overlying seawater (Eldridge et al., 1983). The study on the chimney ores from Kuroko deposits support this model which is discussed below. [Pg.366]

Elderfield and Schultz (1996) estimated midoceanic ridge hydrothermal fluxes using heat and water fluxes estimated by various data (" He/heat, Mg concentration, Sr isotopes, Li isotopes, Ge/Si ratio). Their estimated fluxes are presented in Fig. 3.7 and Table 3.7. [Pg.424]

Au, Sb and Hg are more enriched into the ores of back-arc basins compared with midoceanic ridge and thus it is likely that back-arc basin hydrothermal flux for these elements is higher than midoceanic ridge hydrothermal flux. However, the concentrations of these elements in back-arc basin hydrothermal solution have not been analyzed. Thus, we need to accumulate analytical data on the concentration of these elements in back-arc basin hydrothermal solution. Further, H2O flux from back-arc basin has to be estimated based on various methods ( He/He, Mg concentration, Li isotope, Sr isotope, Ge/Si ratio) which was argued for midoceanic ridge hydrothermal system by Elderfield and Schultz (1996), but not for back-arc basin by the previous workers. [Pg.425]

Christensen JN, DePaolo DJ (1993) Time scales of large volume silicic magma systems Sr isotopic systematics of phenocrysts and glass from the Bishop Tuff, Long Valley, California. Contrib Mineral Petrol 113 100-114... [Pg.170]

FAMOUS zone (Mid-Atlantic Ridge, 36°50 N) Th and Sr isotopic geochemistry. Earth Planet Sci Lett 55 247-256... [Pg.208]

Eaby JS, Clague DA, Delaney JR (1984) Sr isotopic variations along the Juan de Fuca Ridge. J Geophys... [Pg.208]

Rubin KH, Macdougall JD (1992) Th-Sr isotopic relationships in MORE. Earth Planet Sei Lett 114 149-157... [Pg.210]

McDermott F, Hawkesworth C (1991) Th, Pb, and Sr isotope variations in young island arc volcarucs and oceaiuc sediments. Earth Planet Sci Lett 104 1-15... [Pg.307]

Figure 20. Plot of ratios against Sr isotope ratios for water samples of Himalayan streams... Figure 20. Plot of ratios against Sr isotope ratios for water samples of Himalayan streams...
Figure 23. Relationship between ( Ra/ Ra) ratios and Sr/ Sr isotopic ratio in the dissolved load of the Ganges main stream and its tributaries. Radium data from Sarin et al. (1990), Sr data from Palmer and Edmond (1992). Figure 23. Relationship between ( Ra/ Ra) ratios and Sr/ Sr isotopic ratio in the dissolved load of the Ganges main stream and its tributaries. Radium data from Sarin et al. (1990), Sr data from Palmer and Edmond (1992).
Ben Othman D, Luck JM, Toumoud MG (1997) Geochemistry and water dynamics application to short time-scale flood phenomena in a small Mediterranean catchment. I- Alkalis, alkali-earths and Sr isotopes. Chem Geol 140 9-28... [Pg.119]

Petelet-Giraud E, Negrel P (2007) Geochemical flood deconvolution in a Mediterranean catchment (Herault, France) by Sr isotopes, major and trace elements. J Hydrol 337 (l-2) 224—241... [Pg.120]

Given the extremely small variations of the Sr isotope compositions (most Sr is 88Sr), a86 is virtually identical for each component, hence it can be canceled out so that... [Pg.13]

The Sr isotope composition of the hydrothermally altered basalts (hr) being identical to that of the hydrothermal fluid (hw), we prepare for integration rewriting... [Pg.50]

The Student-t percentile t5,97.5 is 2.57, so 95 percent of the surface enclosed under the Student distribution curve lies inside the interval [—2.57, +2.57]. Since t lies within that interval, we will assume that the mass spectrometer is unbiased for Sr isotope measurements, o... [Pg.212]

Barling and Goldstein (1989) have measured Pb and Sr isotope compositions in recent lavas from Heard Island (Southern Indian Ocean). They obtained the data listed in Table 5.6. Find the parameters of a least-square mixing hyperbola fitting the observations. [Pg.262]

Figure 7.5 Relative rate of change of Sr concentration in seawater calculated from equation (7.2.23) for the last 35 million years using the Sr isotope data for seawater of DePaolo and Ingram (1985). Calculations are made for t = 0, 15, 30 Ma. Residence time of Sr in the ocean is assumed to be 4 Ma (Holland, 1978, bottom) which gives an unrealistic rate of change for Sr concentration. An alternative residence time of 20 Ma (top) seems more adequate. Figure 7.5 Relative rate of change of Sr concentration in seawater calculated from equation (7.2.23) for the last 35 million years using the Sr isotope data for seawater of DePaolo and Ingram (1985). Calculations are made for t = 0, 15, 30 Ma. Residence time of Sr in the ocean is assumed to be 4 Ma (Holland, 1978, bottom) which gives an unrealistic rate of change for Sr concentration. An alternative residence time of 20 Ma (top) seems more adequate.
Allegre, C. J., Hart, S. R. Minster, J.-F. (1983). Chemical structure and evolution of the mantle and the continents determined by inversion of Nd and Sr isotopic data, I. Theoretical models. Earth Planet. Sci. Letters, 66, 177-90. [Pg.526]

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