Thy, Peter (1992): (Table 1) Geochemistry of realatively fresh rocks of ODP Sites 127-794 and 127-797 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.777463, Supplement to: Thy, P (1992): Liquid lines of descent of basalts drilled at Sites 794 and 797 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), 869-882, https://doi.org/10.2973/odp.proc.sr.127128-2.204.1992
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Abstract:
The flows and sills drilled at Sites 794 and 797 in the Yamato Basin of the Japan Sea are subalkalic, olivine, and/or plagioclase phyric basalts. Compositionally, the rocks can be divided into a depleted, low-K type and an enriched, relatively high-K type. In addition, two contrasting evolution trends are reflected in the rock compositions, which allow four different magmatic suites to be identified. It is suggested that the depleted or enriched nature of these suites represent primary characteristics, while the different evolution trends are related to fractionation processes in crustal magma chambers. A tholeiitic evolution trend, with increasing FeO and TiO2 and decreasing Al2O3, can be modelled by fractional crystallization of 40%-50% plagioclase, olivine, and augite. A mildly calc-alkalic evolution trend, with decreasing FeO, increasing Al2O3, and nearly constant TiO2, can be modelled by 8%-12% olivine fractionation. Mineralogical evidence suggests that these differences may be related to the effect of small amounts of water during crystallization of the calc-alkalic suites. The tholeiitic suites occur in the lower parts of the drill cores, while the calc-alkalic suites occur in the upper parts. This suggests a complex tectonic and magmatic evolution, perhaps reflecting a transition between calc-alkalic magmatism related to subduction zone activity and tholeiitic magmatism related to back-arc spreading. Furthermore, any magmatic model must be able to account for the range in parental magmas from depleted to enriched throughout the tectonic history of the Yamato Basin.
Related to:
Tamaki, Kensaku; Pisciotto, Kenneth A; Allan, J; et al. (1990): Proceedings of the Ocean Drilling Program, 127 Initial Reports. Proceedings of the Ocean Drilling Program, Ocean Drilling Program, 127, 844 pp, https://doi.org/10.2973/odp.proc.ir.127.1990
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 39.403000 * Median Longitude: 136.383500 * South-bound Latitude: 38.616000 * West-bound Longitude: 134.536000 * North-bound Latitude: 40.190000 * East-bound Longitude: 138.231000
Date/Time Start: 1989-06-26T00:00:00 * Date/Time End: 1989-08-18T17:00:00
Minimum Elevation: -2876.0 m * Maximum Elevation: -2821.3 m
Event(s):
127-794 * Latitude: 40.190000 * Longitude: 138.231000 * Date/Time Start: 1989-06-26T00:00:00 * Date/Time End: 1989-07-11T00:00:00 * Elevation: -2821.3 m * Penetration: 1554 m * Recovery: 422.8 m * Location: Japan Sea * Campaign: Leg127 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 78 cores; 694.4 m cored; 0 m drilled; 60.9% recovery
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
Comment:
Relative unaltered samples, analyzed shipboard.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Sample code/label | Sample label | Thy, Peter | DSDP/ODP/IODP sample designation | ||
| 3 | Sample comment | Sample comment | Thy, Peter | X-ray fluorescence (XRF) | ||
| 4 | Silicon dioxide | SiO2 | % | Thy, Peter | X-ray fluorescence (XRF) | |
| 5 | Titanium dioxide | TiO2 | % | Thy, Peter | X-ray fluorescence (XRF) | |
| 6 | Aluminium oxide | Al2O3 | % | Thy, Peter | X-ray fluorescence (XRF) | |
| 7 | Iron oxide, Fe2O3 | Fe2O3 | % | Thy, Peter | X-ray fluorescence (XRF) | |
| 8 | Iron oxide, FeO | FeO | % | Thy, Peter | X-ray fluorescence (XRF) | |
| 9 | Manganese oxide | MnO | % | Thy, Peter | X-ray fluorescence (XRF) | |
| 10 | Magnesium oxide | MgO | % | Thy, Peter | X-ray fluorescence (XRF) | |
| 11 | Calcium oxide | CaO | % | Thy, Peter | X-ray fluorescence (XRF) | |
| 12 | Sodium oxide | Na2O | % | Thy, Peter | X-ray fluorescence (XRF) | |
| 13 | Potassium oxide | K2O | % | Thy, Peter | X-ray fluorescence (XRF) | |
| 14 | Phosphorus pentoxide | P2O5 | % | Thy, Peter | X-ray fluorescence (XRF) | |
| 15 | Magnesium number | Mg# | Thy, Peter | X-ray fluorescence (XRF) | ||
| 16 | Zirconium | Zr | mg/kg | Thy, Peter | X-ray fluorescence (XRF) | |
| 17 | Nickel | Ni | mg/kg | Thy, Peter | X-ray fluorescence (XRF) |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
304 data points