东秦岭宽坪花岗岩体特征及其成因

宽坪花岗岩体的野外地质、岩石学及地球化学特征表明，该岩体为一具主动侵位特征的同构造花岗岩体，属Ｓ型花岗岩。其源岩物质为秦岭群变质杂岩。根据这些地质事实并结合区域地质事件综合分析，该岩体是早古生代末－晚古生代初，华北与扬子两大板块开始闭合，华北板块南缘发生小规模洋内弧－岛弧碰撞拼贴不同构造岩片就位过程中作为岛弧陆壳物质的秦岭群变质杂岩活化重熔的产物。

CHARACTERISTICS AND ORIGIN OF KUANPING GRANITE BODY IN THE EAST QINLING

The features of field geology, petrology and geochemistry of Kuanping granite body indicate that the pluton is a syn-tectonic granite body with character of passive emplacement,being of S-type granite which derived from the source of Qinling metamorphic complex.Based on these geological facts and concerned with other regional geological events,the pluton was remelted from the Qinling metamorphic complex due to the effect of emplacement of different rock sheets accompanied by the collision and matching between intraoceanic volcanic are and island-are during the late Caledonian to the early Hercynian when the closing between the North China and the Yangtze plates began.