摘要
在1/5万袁家房子等四幅区域矿产地质填图的基础上,对乌兰巴山复式岩体的野外地质特征、岩石学、矿物学、地球化学和同位素年代学等方面进行了初步研究。同位素锆石U-Pb分析结果表明,206Pb/238U表面年龄为225.4±1.6 Ma岩体,侵位时代为早三叠纪。该岩体总体展布受区域北东向构造控制明显。岩石化学、地球化学表明该复式岩体属钙碱性岩;东壕欠闪长岩可能为地幔成因,并有地壳物质的加入,乌兰巴山等花岗岩、二长花岗岩可能为壳源成因。稀土元素配分曲线显示出向右倾的平坦曲线型,轻稀土富集,重稀土明显亏损,无明显的铕异常。
In 1/50 000 Yuanjiafangzi and three other regional geological mapping, petrology, mineralogy, geochemical and isotopic chronology were studied based on the geological characteristics of the complex rock mass in the Ulan Hill Chahar Banner,Inner Mongolia. Isotope zircon U Pb results, ^206Pb /^ 238 U surface age 225.4＋ 1.6 Ma, can be the Jurassic emplacement age. The rock mass distribution is controlled by the regional NE fault obviously. The rock geochemical data shows that it belongs to calc alkaline rock series. The Donghaokan diorite may be mantle origin with the crustal material mixing. Ulan Hill granites may be crust origin. REE curves showed a rightward flat type with LREE enrichment, HREE apparently absent, and no obvious Europium anomaly exist.
出处
《地质调查与研究》
2012年第1期22-28,共7页
Geological Survey and Research
基金
内蒙古自治区地质勘查项目([2005]矿调1-8)
关键词
复式岩体
地球化学特征
岩石学
乌兰巴山
内蒙古
composite rock mass
geochemical characteristics
petrology
Ulan Hill
Inner Mongolia
