岩石矿物学杂志2013，Vol.32Issue(1)：63-72,10.
小兴安岭西北部晚石炭世造山后达音河岩体的特征及其地质意义
Characteristics of the Late Carboniferious post-orogenic Dayinhe intrusion in the northwest of the Xiao Hinggan Mountains and their geological implications
摘要
Abstract
The Dayinhe intrusion, located in the northwest of the Xiao Hinggan Mountains, is mainly composed of alkali-feldspar granite and syenogranite. Zircon U-Pb age obtained by LA-ICP-MS analysis of the alkali-feldspar granite is 304.4 ±1.3 Ma, suggesting that it intruded in the Late Carboniferous period rather than the Late Jurassic period as proposed before. Petrochemically, the Dayinhe intrusion is characterized by high Si, Na, K and low Ca. It is enriched in Rb, La, Th and depleted in Ba, Sr. Nb, Ta, Zr, implying the effect of plagio-clase as the stable residual phase in the magma source. Regionally, the Dayinhe intrusion, together with the Shierzhan, Xinkailin, Longzhen and Zhalantun granites that share the same petrologic and geochemical characteristics, forms the Late Carboniferous post-orogenic I-type and A-type granite belt in the Da Hinggan Mountains, implying the end of the collision and orogen between the Hinggan block and the Songnen block and the beginning of post-orogeic extension in this region.关键词
达音河岩体/锆石U-Pb年龄/小兴安岭/晚石炭世/造山后伸展Key words
Dayinhe instrusion/ zircon U-Pb date/ Xiao Hinggan Mountains/ Late Carboniferous/ post-orogenic extension分类
天文与地球科学引用本文复制引用
赵院冬,赵君,王奎良,车继英,吴大天,许逢明,李世超..小兴安岭西北部晚石炭世造山后达音河岩体的特征及其地质意义[J].岩石矿物学杂志,2013,32(1):63-72,10.基金项目
中国地质调查局地质调查项目(1212011121082,1212011085235) （1212011121082,1212011085235）
