Origin of granitic rocks at the southern margin of the Ryoke belt in the Mikawaono-Toei area, central Japan--Rb-Sr dating and tectonic implications (西南日本の地殻形成と改変) -- (中・古生代の地殻形成テクトニクス)
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概要
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中部地方, 三河大野-東栄地域において領家帯南縁の岩石はナップをなして三波川帯の上位に水平的にのっている。この地域の領家ナップコンプレックスの花崗岩質岩(大島花崗岩・相川トーナル岩・浅川沢花崗岩)のRb-Sr年代を測定した。大島花崗岩は79.3±0.9 Maの鉱物年代を示し, 領家新期花崗岩に対比される。領家古期花崗岩の相川トーナル岩は72.3±14.1 Maの全岩年代と65.9±14.6 Maの鉱物年代が得られたが, 後の時期の影響を受けていると考えられる。浅川沢花崗岩は151.6±18.3 Maのマイロナイト化の時期を示すと考えられる全岩年代と, 61.5±1.4 Maのカタクラサイト化の時期に対応する全岩年代が得られた。マイロナイトの鉱物年代は62.2±3.0 Ma でカタクラサイト化作用による影響を受けている。領家ナップコンプレックスには領家帯の花崗岩(大島花崗岩・相川トーナル岩)だけでなく, 先領家大陸地殻の断片(浅川沢花崗岩)も含んでいることが明らかになった。浅川沢花崗岩を形成した後期ジュラ紀火成活動は, 古領家陸塊に起こったと考えられる。
- 1993-04-30
著者
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KAGAMI Hiroo
Institute for Study of Earth's Interior, Okayama University
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Ohtomo Yukiko
Earthquake Research Institute University Of Tokyo
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Hara Ikuo
Department of Earth and Planetary Systems Science, Faculty of Science, Hiroshima University
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Hara I
Hiroshima Univ. Higashihiroshima Jpn
関連論文
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