Mendeley出力
＜紀要論文＞
室戸岬ハンレイ岩体に伴う文象斑岩のRb-Sr年齢
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| 概要 | Rb and Sr concentrations, and Sr isotopic compositions were determined on granophyre associated with the Muroto-misaki gabbroic complex, and on gneissose gabbro boulder from an igneous breccia with dy...ke form cutting the Muroto-misaki olistostrome. The biotite-whole rock isochron age of the granophyre is 14. 4±0.4 Ma and the initial 87^Sr/86^Sr ratio is 0.70505. The granophyre is the same in age as Middle Miocene granitic intrusions in the Shimanto Terrane. The muscovite and whole rock of the gneissose gabbro have high Sr contents (2011 and 1272 ppm) and relatively high 87^Sr/86^Sr ratios (0.70907 and 0.70817). Since the muscovite has higher 87Sr/86Sr ratio and lower Rb/Sr ratio than whole rock, the age is not defined for the gneissose gabbro.続きを見る |
| 目次 | I. はじめに II. 試料および産状 III. 分析方法および測定結果 IV. 考察 |
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| 登録日 | 2021.10.25 |
| 更新日 | 2024.01.31 |