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＜departmental bulletin paper＞
Some problems concerning volcanic pebbles contained in the lat Palaeozoic to early Mesozoic conglomerates in West Chugoku, Southwest Japan
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| Abstract | Abundant volcanic pebbles together with plutonic to hypabyssal ones are found in the late Palaeozoic and early Mesozoic conglomerates in West Chugoku, Southwest Japan. Detailed petrographic and petroc...hemical investigations on these volcanic pebbles reveal that there are distinct differences between the age and the chemical composition or rock type. Most of the volcanic pebbles from the Triassic Mine Group are characterized by the higher K_2O/Na_2O ratio and (K_2O+Na_2O) content than those from the Permian formations, though there are some exceptions. A large part of the former is presumed to belong to the alkaline rock series, presenting a great contrast with the latter which is dominated by the calc-alkaline series of rocks. This implies the volcanic activity of alkaline magma in the late Permian to late Triassic in Southwest Japan.show more |
| Table of Contents | I. はじめに II. 古生代後期礫岩中の火山岩礫 III. 中生代初期礫岩中の火成岩礫 おわりに |
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2.63 MB | 266 |
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| Created Date | 2021.10.27 |
| Modified Date | 2022.06.20 |