@article{oai:niigata-u.repo.nii.ac.jp:00003177,
 author = {志村, 俊昭},
 issue = {1},
 journal = {地質学雑誌, 地質学雑誌},
 month = {Jan},
 note = {The Main zone of the Hidaka metamorphic belt consists of an island arc type crustal section from the lower to upper horizons. In the zone, granitic rocks are widely distributed, intruding into various metamorphic layers, and have characteristic mineral assemblages on each intrusive levels. The granitic rocks are mainly peraluminous (S-type) tonalites and ascribed to have been derived through crustal anatexis in the lower part of the crust, Detailed geological mapping has revealed that a large continuous mass of peraluminous tonalite suite is distributed in the upper reaches of the Niikappu River, which intruded into various metamorphic layers (granulite to lower amphibolite facies metamorphic 1ayers). The metamorphic reactions associated with the granitic magma emplacement indicate that the magma intruded in the various levels of the "Hidaka Crust", prior to the crustal uplifiting. The intrusive body occupies two specific structural breaks in the crust ; one is a basal decollement and the other is a ramp to roof thrust of a duplex structure. The intrusion of granitic magma was, therefore, controlled by the decollement and duplex forming tectonics which was caused by the subhorizontal displacement of the island arc crust. This displacement was subsequent to the main metamorphism that gave rise to the formation of metamorphic crust and the generation of granitic magmas. The basal decollement was evolved to a thrust fault due to dextral reverse movement subsequent to the subhorizontal displacement. During uplifting, the basal part of the crustal layers came into contact with a layered ophiolitic unit (the Western Zone). Both were deformed sympathetically, during uplifting. It is inferred that the ductile-brittle transition of the lower sequence of the ophiolite (Zone D of the Western Zone) took place at the depth of about 14km., 島弧地殻の断面とされる日高変成帯主帯には花崗岩質岩類が広く分布している．これらは主帯変成岩層序のさまざまなレベルに迸入しており，変成岩層序への迸入位置ごとに特有の鉱物組み合わせをもっている，新冠川上流地域の主帯の詳細な地質調査の結果，グラニュライト相～角閃岩相下部の変成岩層中に連続して迸入している一連のトーナル岩体を発見した，壁岩への接触変成作用（ないし壁岩のマグマへの同化作用）には迸入レベルによる違いが見られ，“日高地殻”がまだ東上位のほぼ水平な時期に花崗岩質マグマが迸入したことが明らかになった．岩体内部・周辺部の構造解析から，この岩体は下部地殻～中部地殻に生じたduplexのrampに沿って花崗岩質マグマが迸入したものであると考えられる．本地域内で発見された日高主衝上断層の露頭の産状から，西帯D帯はC帯よりも深部で主帯と接合したものであると判断され，日高変成帯主帯と西帯の接合・衝上テクトニクスがより鮮明なものとなった．},
 pages = {1--20},
 title = {花崗岩質マグマの迸入と日高変成帯の衡上テクトニクス},
 volume = {98},
 year = {1992}
}