Argon analyses of volcanic rocks from the Japan Sea floor
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| Autori principali: | , , , , |
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
1992
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| _version_ | 1867170461883826176 |
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| author | Kaneoka, Ichiro Takigami, Yutaka Takaoka, Nobuo Yamashita, Shigeru Tamaki, Kensaku |
| author_facet | Kaneoka, Ichiro Takigami, Yutaka Takaoka, Nobuo Yamashita, Shigeru Tamaki, Kensaku |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_777462 |
| institution | PANGAEA |
| language | en |
| publishDate | 1992 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Argon analyses of volcanic rocks from the Japan Sea floor Kaneoka, Ichiro Takigami, Yutaka Takaoka, Nobuo Yamashita, Shigeru Tamaki, Kensaku 127-794C; 127-795B; 127-797C; 128-794D; DRILL; Drilling/drill rig; Japan Sea; Joides Resolution; Leg127; Leg128; Ocean Drilling Program; ODP 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. |
| title | Argon analyses of volcanic rocks from the Japan Sea floor |
| topic | 127-794C; 127-795B; 127-797C; 128-794D; DRILL; Drilling/drill rig; Japan Sea; Joides Resolution; Leg127; Leg128; Ocean Drilling Program; ODP |
| url | https://doi.org/10.1594/PANGAEA.777462 |