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Sr isotopic composition

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]

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]

Baker D.R. (1989) Tracer versus trace element diffusion diffusional decoupling of Sr concentration from Sr isotope composition. Geochim. Cosmochim. Acta 53, 3015-3023. [Pg.594]

Few Sr, Nd and Pb isotopic analyses have been published (Fig. 8.6). The available data show unradiogenic Sr isotopic compositions (87Sr/86Sr around 0.7030) and radiogenic Nd and Pb (143Nd/144Nd 0.51296 ... [Pg.238]

Barbieri M, Peccerillo A, Poli G, Tolomeo L (1988) Major, trace element and Sr isotopic composition of lavas from Vico volcano (Central Italy) and their evolution in an open system. Contrib Mineral Petrol 99 485-497... [Pg.324]

Podosek F. A., Prombo C. A., Amari S., and Lewis R. S. (2003) s-Process Sr isotopic compositions in presolar SiC from the Murchsion meteorite. Astrophys. J. (in press). [Pg.41]

This indicates that small volume melts have a limited capacity to modify the Nd-Sr isotopic composition of mantle rocks. [Pg.854]

Figure 30 Simplified geological map of the Lherz orogenic peridotite (Eastern Pyrenees), after Conquere (1978) and Monchoux (unpublished data), showing the hazburgite layering concordant with peridotite foliation. Based on their enriched Nd-Sr isotopic composition (e.g., Downes et al, 1991), the harzburgite layers are interpreted as residual strips of aged, isotopically enriched, but refractory, mantle lithosphere, embedded into younger, depleted but fertile, asthenospheric mantle (spinel Iherzolites). This marble cake stmcture is tentatively ascribed to thermomechanical erosion of lithospheric mantle by upwelling asthenosphere. Figure 30 Simplified geological map of the Lherz orogenic peridotite (Eastern Pyrenees), after Conquere (1978) and Monchoux (unpublished data), showing the hazburgite layering concordant with peridotite foliation. Based on their enriched Nd-Sr isotopic composition (e.g., Downes et al, 1991), the harzburgite layers are interpreted as residual strips of aged, isotopically enriched, but refractory, mantle lithosphere, embedded into younger, depleted but fertile, asthenospheric mantle (spinel Iherzolites). This marble cake stmcture is tentatively ascribed to thermomechanical erosion of lithospheric mantle by upwelling asthenosphere.
Figure 31 Whole-rock versus mineral separate Nd-Sr isotopic compositions for kimberlite derived xenoliths from Bultfontein (Richardson et al, 1985) and one sample from Jagersfontein (Walker et al., 1989a). Lines connect coexisting phases/whole-rocks. Initial isotopic composition of the Bultfontein kimberlite is also plotted. Jagersfontein... Figure 31 Whole-rock versus mineral separate Nd-Sr isotopic compositions for kimberlite derived xenoliths from Bultfontein (Richardson et al, 1985) and one sample from Jagersfontein (Walker et al., 1989a). Lines connect coexisting phases/whole-rocks. Initial isotopic composition of the Bultfontein kimberlite is also plotted. Jagersfontein...
Figure 37 Frequency distribution plots for Os, Nd, and Sr isotope compositions of cratonic and noncratonic peridotite xenoliths. Upper right plots give the range for ocean island basalts (OIB) and arrows show the direction of isotopic evolution for melt depletion and enrichment events. Data compiled from sources cited in Menzies (1990b), Pearson (1999a,b), and those given in Figure 21 (after Pearson and Nowell, 2002). Figure 37 Frequency distribution plots for Os, Nd, and Sr isotope compositions of cratonic and noncratonic peridotite xenoliths. Upper right plots give the range for ocean island basalts (OIB) and arrows show the direction of isotopic evolution for melt depletion and enrichment events. Data compiled from sources cited in Menzies (1990b), Pearson (1999a,b), and those given in Figure 21 (after Pearson and Nowell, 2002).
Rudnick R. L. (1990b) Nd and Sr isotopic compositions of lower crustal xenoliths from North Queensland, Australia implications for Nd model ages and crustal growth processes. Chem. Geol. 83, 195 - 208. [Pg.1327]

Ruiz J., Patchett P. J., and Arculus R. J. (1988a) Nd-Sr isotope composition of lower crustal xenoliths—evidence for the origin of mid-Tertiary felsic volcanics in Mexico. Contrib. Mineral. Petrol. 99, 36—43. [Pg.1327]

Figure 25 (a) Sr isotope composition of segments from a large garnet and its rock matrix, illustrating very slow... [Pg.1515]

Stewart B. W., Capo R. C., and Chadwick O. A. (2001) Effects of rainfall on weathering rate, base cation provenance, and Sr isotope composition of Hawaiian soils. Geochim. Cosmochim. Acta 65, 1087-1099. [Pg.2422]

Jacobson A. D., Blum J. D., and Walter L. M. (2002) Reconciling the elemental and Sr isotope composition of Himalayan weathering fluxes insights from the carbonate geochemistry of stream waters. Geochim. Cosmochim. Acta 66, 3417-3429. [Pg.2459]

Starinsky A., Bielski M., Ecker A., and Steinitz G. (1983a) Tracing the origin of salts in groundwater by Sr isotopic composition (the crystalline complex of the southern Sinai, Egypt). Chem. Geol. 41, 257-267. [Pg.2644]

Sr isotopic composition of the system at the beginning, i.e., crystallization of a mineral/rock ... [Pg.2809]

McLennan S. M., Taylor S. R., McCulloch M. T., and Maynard J. B. (1990) Geochemical and Nd-Sr isotopic composition of deep-sea turbidites crustal evolution and plate tectonic associations. Geochim. Cosmochim. Acta 54, 2015-2050. [Pg.3867]

See other pages where Sr isotopic composition is mentioned: [Pg.334]    [Pg.161]    [Pg.238]    [Pg.217]    [Pg.1554]    [Pg.24]    [Pg.99]    [Pg.163]    [Pg.196]    [Pg.207]    [Pg.266]    [Pg.299]    [Pg.303]    [Pg.317]    [Pg.439]    [Pg.853]    [Pg.854]    [Pg.857]    [Pg.924]    [Pg.929]    [Pg.947]    [Pg.948]    [Pg.1205]    [Pg.1446]    [Pg.2629]    [Pg.2643]    [Pg.3829]   
See also in sourсe #XX -- [ Pg.55 ]



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