摘要
在详细的野外地质调查研究基础上 ,采用高精度的40 Ar - 3 9Ar测年技术 ,对北山明水地区大面积分布的花岗岩类岩体进行了同位素年龄测试 ,确定其为印支期侵入体。该岩体时代的准确界定 ,说明印支期构造 -岩浆活动对北山地区的大地构造格架产生了十分重要的影响 ,它可能是由塔里木板块与哈萨克斯坦板块最终碰撞对接引起的。
Usually associated with large_scale tectono_magmatic activities, granitoids are widely spread in Beishan area. This paper mainly focuses on the geochronology of the granite in Mingshui area. Based on the 40 Ar- 39 Ar isotopic dating of biotite from the granite in Mingshui, the authors obtained a plateau age of 218.4±0.5 Ma, which indicates that the granite in Mingshui must have intruded during the Indosinian movement and might have been produced by eventual collision between the Tarim and the Kazakhstan plates.
出处
《岩石矿物学杂志》
CAS
CSCD
北大核心
2003年第2期107-111,共5页
Acta Petrologica et Mineralogica
基金
国家自然科学基金资助项目 (4 0 0 73 0 15)
科技部国家科技攻关资助项目(2 0 0 1BA60 9A -0 3 )
国土资源大调查资助项目 (K1.3 .3 2 )
