Argon analyses of volcanic rocks from the Japan Sea floor


Autoria(s): Kaneoka, Ichiro; Takigami, Yutaka; Takaoka, Nobuo; Yamashita, Shigeru; Tamaki, Kensaku
Cobertura

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

Data(s)

12/03/1992

Resumo

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.

Formato

application/zip, 2 datasets

Identificador

https://doi.pangaea.de/10.1594/PANGAEA.777462

doi:10.1594/PANGAEA.777462

Idioma(s)

en

Publicador

PANGAEA

Direitos

CC-BY: Creative Commons Attribution 3.0 Unported

Access constraints: unrestricted

Fonte

Supplement to: Kaneoka, Ichiro; Takigami, Yutaka; Takaoka, Nobuo; Yamashita, Shigeru; Tamaki, Kensaku (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, doi:10.2973/odp.proc.sr.127128-2.200.1992

Palavras-Chave #127-794C; 127-795B; 127-797C; 128-794D; 36Ar/40Ar; 36Ar/40Ar std dev; 37Ar/39Ar; 37Ar/39Ar std dev; 39Ar; 39Ar/40Ar; 39Ar/40Ar std dev; 40Ar; 40Ar/39Ar; 40Ar/39Ar std dev; Age, 40Ar/39Ar Argon-Argon; Age, dated; Age, dated standard deviation; Age dated; Age std dev; Argon-36/Argon-40; Argon-36/Argon-40, standard deviation; Argon-37/Argon-39; Argon-37/Argon-39, standard deviation; Argon-39; Argon-39/Argon-40; Argon-39/Argon-40, standard deviation; Argon-40; Argon-40/Argon-39; Argon-40/Argon-39, standard deviation; DRILL; Drilling/drill rig; Event; integrated; Japan Sea; Joides Resolution; Label; Leg127; Leg128; maximum; minimum; no value = total; Ocean Drilling Program; ODP; ODP sample designation; plateau; Rock; Rock type; Samp com; Sample code/label; Sample comment; T cal; Temperature, calculated; Temperature, technical; total; T tech
Tipo

Dataset