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Thy, Peter (1992): Low-pressure melting relations of a basalt from ODP Hole 127-797C [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.777501, Supplement to: Thy, P (1992): Low-pressure melting relations of a basalt from Hole 797C in the Yamato Basin of the Japan Sea. In: Tamaki, K; Suychiro, K; Allan, J; McWilliams, M; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 127/128(2), 861-868, https://doi.org/10.2973/odp.proc.sr.127128-2.203.1992

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Abstract:
One-atmosphere melting experiments, controlled to approximately the fayalite-magnetite-quartz oxygen buffer, performed on a basalt from Hole 797C crystallized olivine and plagioclase nearly simultaneously from about 1235°C and augite from about 1175°C. The liquid compositions indicate systematic trends of increasing FeO and TiO2 and decreasing Al2O3 with decreasing MgO. Experimental olivine compositions vary from Fo90 to Fo78, plagioclase from An79 to An67, and augite from En49 to En46. The KD value for the Fe2+ and Mg distribution between olivine and liquid is 0.31. The KD value for the distribution of Fetotal and Mg between augite and liquid averages 0.24. These KD values suggest experimental equilibrium. The KD values for Na and Ca distribution between plagioclase and liquid range between 0.55 and 0.99 and are dependent on crystallization temperature. Projected on pseudoternary basaltic phase diagrams, the liquid line of descent moves toward increasing quartz normative compositions, revealing a typical tholeiitic crystallization trend with marked Fe and Ti enrichments. Such enrichments are a reflection of the dominance of plagioclase in the crystallizing assemblage. The experimental results can explain the marked Fe- and Ti-enrichment trends observed for the sills of the lower part of Hole 797C, but have no direct bearing on the origin of the relatively evolved high-Al basalts of Hole 794C.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 38.616000 * Longitude: 134.536000
Date/Time Start: 1989-08-04T17:00:00 * Date/Time End: 1989-08-18T17:00:00
Event(s):
127-797C * Latitude: 38.616000 * Longitude: 134.536000 * Date/Time Start: 1989-08-04T17:00:00 * Date/Time End: 1989-08-18T17:00:00 * Elevation: -2876.0 m * Penetration: 900.1 m * Recovery: 164.18 m * Location: Japan Sea * Campaign: Leg127 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 45 cores; 416.1 m cored; 0 m drilled; 39.5 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
6 datasets

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Datasets listed in this publication series

  1. Thy, P (1992): (Table 7) Chemical composition of experimental augite, ODP Hole 127-797C sample. https://doi.org/10.1594/PANGAEA.777500
  2. Thy, P (1992): (Table 2) Experimental conditions and results of ODP Hole 127-797C samples. https://doi.org/10.1594/PANGAEA.777493
  3. Thy, P (1992): (Table 4) Chemical composition of experimental glasses, ODP Hole 127-797C sample. https://doi.org/10.1594/PANGAEA.777494
  4. Thy, P (1992): (Table 5) Chemical composition of experimental olivine, ODP Hole 127-797C sample. https://doi.org/10.1594/PANGAEA.777496
  5. Thy, P (1992): (Table 6) Chemical composition of experimental plagioclase, ODP Hole 127-797C sample. https://doi.org/10.1594/PANGAEA.777497
  6. Thy, P (1992): (Table 1) Chemical composition of starting material of ODP Hole 127-797C. https://doi.org/10.1594/PANGAEA.777490