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  • 42.80  (1)
  • 69-504B; 70-504B; Alteration; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Glomar Challenger; Isotope ratio mass spectrometry; Leg69; Leg70; Lithology/composition/facies; ORDINAL NUMBER; Rubidium; Sample code/label; Sample code/label 2; Strontium; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, error; Water in rock; X-ray fluorescence (XRF); δ18O  (1)
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  • 1
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    87Sr/86Sr ratios, Sr and Rb concentrations and stable oxygen isotope values for some basalts from ODP Hole 504B (Table 1)
    PANGAEA
    In:  Supplement to: Barrett, T J; Friedrichsen, Hans (1982): Strontium and oxygen isotopic composition of some basalts from Hole 504B, Costa Rica Rift, DSDP Legs 69 and 70. Earth and Planetary Science Letters, 60(1), 27-38, https://doi.org/10.1016/0012-821X(82)90017-6
    Details
    Publication Date: 2023-06-27
    Description: Seventeen whole-rock samples, generally taken at 25-50 m intervals from 5 to 560 m sub-basement in Hole 504B, drilled in 6.2 m.y. old crust, were analysed for 87Sr/86Sr ratios, Sr and Rb concentrations, and 18O/16O ratios. Sr isotope ratios for 8 samples from the upper 260 m of the hole range from 0.70287 to 0.70377, with a mean of 0.70320. In the 330-560 m interval, 5 samples have a restricted range of 0.70255-0.70279, with a mean of 0.70266, the average value for fresh mid-ocean ridge basalts (MORB). In the 260-330 m interval, approximately intermediate Sr isotopic ratios are found. Delta18O values (‰) range from 6.4 to 7.8 in the upper 260 m, 6.2-6.4 in the 270-320 m interval, and 5.8-6.2 in the 320-560 m interval. The values in the upper 260 m are typical for basalts which have undergone low-temperature seawater alteration, whereas the values for the 320-560 m interval correspond to MORB which have experienced essentially no oxygen isotopic alteration. The higher 87Sr/86Sr and 18O/16O ratios in the upper part of the hole can be interpreted as the result of a greater overall water/rock ratio in the upper part of the Hole 504B crust than in the lower part. Interaction of basalt with seawater (87Sr/86Sr = 0.7091) increased basalt 87Sr/86Sr ratios and produced smectitic alteration products which raised whole-rock delta18O values. Seawater circulation in the lower basalts may have been partly restricted by the greater number of relatively impermeable massive lava flows below about 230 m sub-basement. These flows may have helped to seal off lower basalts from through-flowing seawater.
    Keywords: 69-504B; 70-504B; Alteration; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Glomar Challenger; Isotope ratio mass spectrometry; Leg69; Leg70; Lithology/composition/facies; ORDINAL NUMBER; Rubidium; Sample code/label; Sample code/label 2; Strontium; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, error; Water in rock; X-ray fluorescence (XRF); δ18O
    Type: Dataset
    Format: text/tab-separated-values, 153 data points
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    DATA PANGAEA
  • 2
    Electronic Resource
    Electronic Resource
    The identification of nonlinear molecular systems by spectroscopic methods (1978)
    Springer
    Applied physics 15 (1978), S. 213-218 
    Details
    ISSN: 1432-0630
    Keywords: 42.65 ; 42.80 ; 32
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The Wiener functional expansion method for the analysis of nonlinear systems is applied to identify and analyze both nonlinear and linear molecular systems by spectroscopic methods. As the sampling filter (monochromator) of any spectroscopic apparatus may be defined by a Weber-Hermite polynomial, an analysis of the refracted or scattered light by orthogonal polynomials is easily achieved. Time averaging obtains the Weber-Hermite coefficients which permit the characterization of the molecular system with respect to the polarization of the incident and scattered light. In the case of two series of measurements made with incident and emerging light polarized in different directions: the identification of the JonesM matrices for the molecular system irradiated is possible. In the case of three series of measurements made, for example, with incident and emerging light (a) circularly polarized corotating, (b) circularly polarized contrarotating, and (c) plane polarized perpendicular: the identification of the molecular system's McClain invariants related to the vibrational symmetry group for Raman inelastic light scattering is possible. The analysis presents a unified picture of elastic and inelastic light scattering and one-photon and two-photon processes. The apparatus described would detect those instances in molecular systems for which Beer's law does not apply.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00928211
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