CAJ | 학술논문

内蒙古固阳地区位于华北克拉通北缘，区内出露大规模晚古生代早石炭世花岗岩，花岗闪长岩呈脉状侵入于主体花岗岩中，同时脉状侵入岩中还有闪长岩包体存在。对这三类岩石分别进行岩石地球化学分析和SHRIMP锆石U-Pb同位素测定，结果表明3个样品均富集LILE和LREEs，且具有REE轻度分馏，Nb、Ta与Ti负异常，Rb、Th和K正异常的特征，为钙碱性系列。花岗岩、花岗闪长岩和闪长岩三个岩体的SHRIMP锆石U-Pb定年结果分别为：330.8 Ma、324.7 Ma、329.2 Ma，属于早石炭世。早石炭世华北克拉通与西伯利亚板块尚未发生碰撞，固阳地区北部的早石炭世岩体应为古亚洲洋向华北板块俯冲的结果。花岗岩主要源于陆壳物质的重熔，花岗闪长岩可能来源于花岗质岩浆和闪长质岩浆的混合作用。
내몽고고양지구위우화북극랍통북연，구내출로대규모만고생대조석탄세화강암，화강섬장암정맥상침입우주체화강암중，동시맥상침입암중환유섬장암포체존재。대저삼류암석분별진행암석지구화학분석화SHRIMP고석U-Pb동위소측정，결과표명3개양품균부집LILE화LREEs，차구유REE경도분류，Nb、Ta여Ti부이상，Rb、Th화K정이상적특정，위개감성계렬。화강암、화강섬장암화섬장암삼개암체적SHRIMP고석U-Pb정년결과분별위：330.8 Ma、324.7 Ma、329.2 Ma，속우조석탄세。조석탄세화북극랍통여서백리아판괴상미발생팽당，고양지구북부적조석탄세암체응위고아주양향화북판괴부충적결과。화강암주요원우륙각물질적중용，화강섬장암가능래원우화강질암장화섬장질암장적혼합작용。
Guyang area is located in the northern margin of the North China Craton, and Neopaleozoic granites are widespread there. In these granitic intrusions, granodiorite occurs as late intrusive veins, and diorite enclaves can be found in the granodioritic veins. For these three kinds of rocks, major and trace elements are measured to constrain their geochemical characteristics, while zircons are measured by SHRIMP to provide U-Pb ages. All these samples are calc-alkaline series, and enriched in LILE and LREEs, and show a mild fractionated REE. On a primitive-mantle normalized spidergram, these rocks show distinctly negative Nb, Ta, Ti anomalies and positive Rb, Th, K anomalies. U-Pb dating of zircon yielded crystallization ages of 330.8Ma, 324.7Ma, and 329.2Ma for the granite, the granodiorite and the diorite, respectively, which belong to the early carboniferous.The early Carboniferous magmatic rocks in northern margin of North China Craton should be associated to the subducting of Paleo-Asian Ocean to the North China plate, since this occurred before the convergence of the Siberia Craton and the North China Craton. Granites should be generated from remelting of continental crust, and granodiorite probably produced by mixing granitic magma and dioritic magma.