{"ok":true,"version":"1.1.0","license":"https://www.gsj.jp/license/license.html","attribution":"出典：産業技術総合研究所 地質調査総合センター「GSJ 地質図幅凡例データセット」","lang":"ja","type":"LegendUnit","id":"m620_u003","@id":"https://gbank.gsj.jp/ld/resource/zfk/units/m620_u003","geom":{"uri":"https://gbank.gsj.jp/ld/resource/zfk/units/m620_u003/geom","geojson_url":"https://cdn.gsj.jp/ld/zfk/units_geojson/m620_u003.geojson","centroid":{"lat":35.333691,"lon":134.567642,"epsg":4326},"bbox":[134.53749,35.325742,134.618117,35.336506],"color":"#9b8060"},"map":{"type":"LegendMap","map_id":620,"@id":"https://gbank.gsj.jp/ld/resource/zfk/maps/m620","sheet_code":"G50_12_034","series":"5万分の1地質図幅","title_ja":"大屋市場","title_en":null,"author":["広川治","東郷文雄","神戸信和"],"authors":[{"name_display":"広川治","name_ja":"広川治","name_en":"Osamu HIROKAWA","name_alt":["Osamu HIROKAWA"]},{"name_display":"東郷文雄","name_ja":"東郷文雄","name_en":"Humio TOGO","name_alt":["Humio TOGO"]},{"name_display":"神戸信和","name_ja":"神戸信和","name_en":"Nobukazu 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id=\"m620_u003_Aa\"></span><p>新鮮な安山岩は，図幅の北縁に分布するやや塩基性の天滝熔岩（含橄欖石－普通輝石安山岩）と，北西西隅に分布する氷山熔岩（紫蘇輝石－普通輝石安山岩）に分けられる。天滝熔岩は恐らく図幅北東辺の玄武岩と一連のもので，分布状態や地形から見て氷山熔岩より古いものであろう。</p><p>天滝熔岩は暗灰色を呈し，玄武岩に似た部分もあり，かなり塩基性である。斑晶は斜長石・橄欖石および普通輝石で，量の割合は部分によって変化する。石基は間粒状または塡間組織を示し，斜長石・普通輝石・橄欖石等が認められる。</p><p>氷山熔岩は灰色を呈する。斑晶の主な鉱物は斜長石・普通輝石・紫蘇輝石で稀に橄攬石を含む。石基は塡間組織を示し，主として斜長石・単斜輝石および紫蘇輝石からなる。戸倉附近の転石を顕微鏡で観察すると，紫蘇輝石の周辺に単斜輝石の小粒から成る薄い縁があり，斜長石は単斜輝石の小粒を包有する。</p><p>新鮮な安山岩と新期酸性岩類との新旧関係は不明である。</p></div></div>","text":"I.2.16 安山岩類\n新鮮な安山岩は，図幅の北縁に分布するやや塩基性の天滝熔岩（含橄欖石－普通輝石安山岩）と，北西西隅に分布する氷山熔岩（紫蘇輝石－普通輝石安山岩）に分けられる。天滝熔岩は恐らく図幅北東辺の玄武岩と一連のもので，分布状態や地形から見て氷山熔岩より古いものであろう。\n天滝熔岩は暗灰色を呈し，玄武岩に似た部分もあり，かなり塩基性である。斑晶は斜長石・橄欖石および普通輝石で，量の割合は部分によって変化する。石基は間粒状または塡間組織を示し，斜長石・普通輝石・橄欖石等が認められる。\n氷山熔岩は灰色を呈する。斑晶の主な鉱物は斜長石・普通輝石・紫蘇輝石で稀に橄攬石を含む。石基は塡間組織を示し，主として斜長石・単斜輝石および紫蘇輝石からなる。戸倉附近の転石を顕微鏡で観察すると，紫蘇輝石の周辺に単斜輝石の小粒から成る薄い縁があり，斜長石は単斜輝石の小粒を包有する。\n新鮮な安山岩と新期酸性岩類との新旧関係は不明である。","blocks":[{"type":"heading","depth":1,"text":"I.2.16 安山岩類","id":"sec-1-2-16"},{"type":"paragraph","text":"新鮮な安山岩は，図幅の北縁に分布するやや塩基性の天滝熔岩（含橄欖石－普通輝石安山岩）と，北西西隅に分布する氷山熔岩（紫蘇輝石－普通輝石安山岩）に分けられる。天滝熔岩は恐らく図幅北東辺の玄武岩と一連のもので，分布状態や地形から見て氷山熔岩より古いものであろう。"},{"type":"paragraph","text":"天滝熔岩は暗灰色を呈し，玄武岩に似た部分もあり，かなり塩基性である。斑晶は斜長石・橄欖石および普通輝石で，量の割合は部分によって変化する。石基は間粒状または塡間組織を示し，斜長石・普通輝石・橄欖石等が認められる。"},{"type":"paragraph","text":"氷山熔岩は灰色を呈する。斑晶の主な鉱物は斜長石・普通輝石・紫蘇輝石で稀に橄攬石を含む。石基は塡間組織を示し，主として斜長石・単斜輝石および紫蘇輝石からなる。戸倉附近の転石を顕微鏡で観察すると，紫蘇輝石の周辺に単斜輝石の小粒から成る薄い縁があり，斜長石は単斜輝石の小粒を包有する。"},{"type":"paragraph","text":"新鮮な安山岩と新期酸性岩類との新旧関係は不明である。"}],"images":[],"tables":[],"anchors":[{"id":"m620_f002","label":"安山岩類","title":"安山岩類"},{"id":"m620_f003","label":"氷山熔岩","title":"安山岩類 氷山熔岩"},{"id":"m620_f004","label":"天滝熔岩","title":"安山岩類 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