韩旺混合花岗岩体的铅——铅等时线年龄

Pb—Pb ISOCHRON AGE OF THE HANWANG MIGMATITIC GRANITE PLUTON IN YIYUAN COUNTY, SHANDONG PROVINCE

摘要:

岩体地概况 (一)地质特征位于山东省沂源县东南部韩旺、张家坡一带的韩旺花岗岩,呈北北西——南南东向展布,长22公里、宽1—4公里,面积约55平方公里(图1)。该岩体侵位于泰山群雁翎关组各种混合岩、变质岩之间,形态极为复杂。除主体(约20平方公里)外,大都(尤其是边部)呈不规则的枝状、条带状穿插体,主体内亦大量产出围岩残留体。岩体,包括各种穿插体与残留体的展布方向与泰山群变质岩系的片理、片麻理一致。

Abstract:

In this paper the authors present the data showing the age of the Eorly proterozoic Hanwang migmatitic granite pluton by the pb—pb isochron method which is 2206.7 Ma. It is consistent with the pb—pb age (2198.3 Ma) of zircon sampled from the Same granite.