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Ewart, Anthony; Griffin, William L (1994): Geochemistry of ODP Leg 135 vitrophyric rhyolite samples. PANGAEA, https://doi.org/10.1594/PANGAEA.794519, Supplement to: Ewart, A; Griffin, WL (1994): Proton-microprobe trace element study of selected Leg 135 core samples. In: Hawkins, J; Parson, L; Allan, J; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 135, 533-542, https://doi.org/10.2973/odp.proc.sr.135.146.1994

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Abstract:
In-situ proton-microprobe analyses are presented for glasses, plagioclases, pyroxenes, olivines, and spinels in eleven samples from Sites 834-836, 839, and 841 (vitrophyric rhyolite), plus a Tongan dacite. Elements analyzed are Mn, Ni, Cu, Zn, Ga, Rb, Sr, Y, Zr, Pb, and Sn (in spinels only). The data are used to calculate two sets of partition coefficients, one set based on the ratio of element in mineral/element in coexisting glass. The second set of coefficients, thought to be more robust, is corrected by application of the Rayleigh fractionation equations, which requires additional use of modal data. Data are presented for phenocryst core-rim phases and microphenocryst-groundmass phases from a few samples.
Comparison with published coefficients reveals an overall consistency with those presented here, but with some notable anomalies. Examples are relatively high Zr values for pyroxenes and abnormally low Mn values in olivines and clinopyroxenes from Site 839 lavas. Some anomalies may reflect kinetic effects, but interpretation of the coefficients is complicated, especially in olivines from Sites 836 and 839, by possible crystal-liquid disequilibrium resulting from mixing processes.
Project(s):
Coverage:
Median Latitude: -20.781790 * Median Longitude: -176.548025 * South-bound Latitude: -23.346000 * West-bound Longitude: -177.862000 * North-bound Latitude: -18.501000 * East-bound Longitude: -175.297000
Date/Time Start: 1990-12-23T20:39:00 * Date/Time End: 1991-02-10T20:30:00
Size:
12 datasets

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Datasets listed in this Collection

  1. Ewart, A; Griffin, WL (1994): (Table 1) Mineralogy of ODP Leg 135 vitrophyric rhyolite samples. https://doi.org/10.1594/PANGAEA.794501
  2. Ewart, A; Griffin, WL (1994): (Table 10) Trace elements of olivine of ODP Leg 135 vitrophyric rhyolite samples. https://doi.org/10.1594/PANGAEA.794515
  3. Ewart, A; Griffin, WL (1994): (Table 11) Trace elements of chromite magnetite of ODP Leg 135 vitrophyric rhyolite samples. https://doi.org/10.1594/PANGAEA.794516
  4. Ewart, A; Griffin, WL (1994): (Table 12) Major elements of glasses of ODP Leg 135 vitrophyric rhyolite samples. https://doi.org/10.1594/PANGAEA.794517
  5. Ewart, A; Griffin, WL (1994): (Table 2) Partition coefficients for plagioclase of ODP Leg 135 vitrophyric rhyolite samples. https://doi.org/10.1594/PANGAEA.794502
  6. Ewart, A; Griffin, WL (1994): (Table 3) Partition coefficients for clinopyroxene of ODP Leg 135 vitrophyric rhyolite samples. https://doi.org/10.1594/PANGAEA.794503
  7. Ewart, A; Griffin, WL (1994): (Table 4) Partition coefficients for orthopyroxene of ODP Hole 135-839B vitrophyric rhyolite samples. https://doi.org/10.1594/PANGAEA.794504
  8. Ewart, A; Griffin, WL (1994): (Table 5) Partition coefficients for olivine of ODP Leg 135 vitrophyric rhyolite samples. https://doi.org/10.1594/PANGAEA.794506
  9. Ewart, A; Griffin, WL (1994): (Table 6) Partition coefficients for oxide phases of ODP Leg 135 vitrophyric rhyolite samples. https://doi.org/10.1594/PANGAEA.794507
  10. Ewart, A; Griffin, WL (1994): (Table 7) Trace elements of glasses of ODP Leg 135 vitrophyric rhyolite samples. https://doi.org/10.1594/PANGAEA.794508
  11. Ewart, A; Griffin, WL (1994): (Table 8) Trace elements of plagioclase of ODP Leg 135 vitrophyric rhyolite samples. https://doi.org/10.1594/PANGAEA.794511
  12. Ewart, A; Griffin, WL (1994): (Table 9) Trace elements of pyroxene of ODP Leg 135 vitrophyric rhyolite samples. https://doi.org/10.1594/PANGAEA.794513