摘要
在华北地台北缘与其北侧兴蒙造山带的结合部位 ,发育有大量的所谓“加里东期”花岗岩 ,其中以出露在吉林省中部的黄泥岭岩体最为典型。然而 ,高精度的单颗粒锆石 U-Pb定年结果显示 ,采自黄泥岭岩体不同部位的三个样品的同位素年龄分别为 168± 3 Ma、153± 2 Ma和 158± 3 Ma,说明黄泥岭岩体并不是形成于早古生代 ,而是形成于中生代的中 -晚侏罗世。结合前人获得的 166± 2 Ma的锆石 SHRIMP U-Pb年龄 ,本文认为 ,黄泥岭岩体是在 150～ 170 Ma之间由至少两期岩浆活动形成的复式岩体。这一中生代年代学结果的获得 。
it has been thought that the 'Caledonian' granitic intrusions were widely distributed in the intersection,of northern marginal of the North China Craton and the Xing'an-Mongolian orogenic belt, with the Huangniling granite as the most typical one. Single grain zircon U-Pb ages of three samples from this pluton, however, are 168 +/- 3 Ma, 153 +/- 2 Ma and 158 +/- 3 Ma respectively, suggesting that this pluton was emplaced during Middle-Late Jurassic., not in Early Paleozoic as previously thought. Combining with the zircon SHRIMP U-Pb age of 166 2 Ma, it is proposed that the Huangniling pluton was formed during 1.50similar to170 Ma ago by at least two pluses of magmatic activities. There I fore, the Mesozoic age of the Huangniling requires that the traditional model about the collision among the North China Craton, Jiamusi and Xingkai Massifs should be re-evaluated.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2002年第4期475-481,共7页
Acta Petrologica Sinica
基金
中国地质调查局综合研究项目 ( 2 0 0 1 1 30 0 0 0 52 )
国家自然科学基金项目 ( 49872 0 31 )研究成果
