Kaneoka, Ichiro; Takigami, Yutaka; Takaoka, Nobuo; Yamashita, Shigeru; Tamaki, Kensaku (1992): Argon analyses of volcanic rocks from the Japan Sea floor [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.777462, Supplement to: Kaneoka, I et al. (1992): 40Ar-39Ar analysis of volcanic rocks recovered from the Japan Sea floor: constraints on the age of formation 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), 819-836, https://doi.org/10.2973/odp.proc.sr.127128-2.200.1992
Always quote citation above when using data! You can download the citation in several formats below.
Abstract:
Volcanic rocks recovered from the Japan Sea during ODP Legs 127 and 128 were analyzed by 40Ar-39Ar whole-rock stepwise-heating experiments. All three experiments on samples from Site 795 in the Japan Basin revealed disturbed age spectra, but they are consistent with crystallization ages of 15 to 25 Ma for the samples. At Site 797 in the Yamato Basin, three of the five samples showed plateau ages of 18-19 Ma. At Site 794 in the northern Yamato Basin, three of the five samples revealed concordant age spectra of 20-21 Ma. The radiometric age results are consistent with the estimated ages for the oldest sediments at Site 797 based on the biostratigraphy, but are significantly older than those of the oldest sediments at Site 794. However, the radiometric ages are concordant with previously inferred ages for the formation of the Japan Sea floor based on radiometric age data from dredged igneous rocks from the Japan Sea. The present results indicate that formation of the Japan Sea floor started at least 19-20 Ma ago and give more precise age constraints.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 41.190320 * Median Longitude: 136.898620 * South-bound Latitude: 38.616000 * West-bound Longitude: 134.536000 * North-bound Latitude: 43.987000 * East-bound Longitude: 138.965000
Date/Time Start: 1989-07-03T20:30:00 * Date/Time End: 1989-09-29T23:00:00
Event(s):
127-794C * Latitude: 40.190000 * Longitude: 138.231000 * Date/Time Start: 1989-07-03T20:30:00 * Date/Time End: 1989-07-11T11:00:00 * Elevation: -2820.0 m * Penetration: 653.7 m * Recovery: 33.21 m * Location: Japan Sea * Campaign: Leg127 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 14 cores; 93.9 m cored; 0 m drilled; 35.4 % recovery
127-795B * Latitude: 43.987000 * Longitude: 138.965000 * Date/Time Start: 1989-07-16T00:00:00 * Date/Time End: 1989-07-22T02:45:00 * Elevation: -3310.0 m * Penetration: 762.2 m * Recovery: 188.94 m * Location: Japan Sea * Campaign: Leg127 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 41 core; 397 m cored; 0 m drilled; 47.6 % 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
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
Download Data
Datasets listed in this publication series
- Kaneoka, I; Takigami, Y; Takaoka, N et al. (1992): (Table 2) Age determination of Japan Sea floor samples. https://doi.org/10.1594/PANGAEA.777460
- Kaneoka, I; Takigami, Y; Takaoka, N et al. (1992): (Table 1) Ar isotopes in neutron-irradiated rocks recovered from the Japan Sea floor. https://doi.org/10.1594/PANGAEA.777458