大兴安岭东北部早古生代花岗岩锆石U-Pb年龄、Hf同位素特征及地质意义

葛文春 隋振民 吴福元 张吉衡 徐学纯 程瑞玉. 大兴安岭东北部早古生代花岗岩锆石U-Pb年龄、Hf同位素特征及地质意义[J]. 岩石学报, 2007, 23(2): 423-440.
引用本文: 葛文春 隋振民 吴福元 张吉衡 徐学纯 程瑞玉. 大兴安岭东北部早古生代花岗岩锆石U-Pb年龄、Hf同位素特征及地质意义[J]. 岩石学报, 2007, 23(2): 423-440.
Zircon U-Pb ages, Hf isotopic characteristics and their implications of the Early Paleozoic granites in the northeastern Da Hinggan Mts. , northeastern China[J]. Acta Petrologica Sinica, 2007, 23(2): 423-440.
Citation: Zircon U-Pb ages, Hf isotopic characteristics and their implications of the Early Paleozoic granites in the northeastern Da Hinggan Mts. , northeastern China[J]. Acta Petrologica Sinica, 2007, 23(2): 423-440.

大兴安岭东北部早古生代花岗岩锆石U-Pb年龄、Hf同位素特征及地质意义

  • 基金项目:

    本文为国家自然科学基金(40372038,40325006)和高等学校博士学科点专项科研基金(20060184021)项目资助成果.感谢 中国科学院地质与地球物理研究所毛骞博士、谢烈文博士、杨岳衡博士及西北大学柳小旺教授在测试过程中给予的帮助.

Zircon U-Pb ages, Hf isotopic characteristics and their implications of the Early Paleozoic granites in the northeastern Da Hinggan Mts. , northeastern China

  • 大兴安岭东北部早古生代花岗岩属于Ⅰ型花岗岩.锆石的LA-ICPMS U-Pb年代学研究表明,十八站岩体、内河岩体、白银纳岩体的形成年龄分别为499±1、500±1和460±1 Ma,而查拉班河岩体为一多次侵入的杂岩体,其形成年龄在465~481 Ma.结合本区和邻区其它早古生代花岗岩体的锆石U-Pb年龄,限定了大兴安岭东北部地区早古生代花岗岩浆活动的时限为460~500 Ma.锆石的LA-MC-ICPMS Hf同位素研究显示,本区早古生代花岗岩的锆石εHf(t)多数介于+1.5~+3.8之间,二阶段模式年龄介于1.1~1.4 Ga,表明其主要起源于中-新元古代增生的地壳物质.结合兴安地块其它花岗岩的锆石Hf同位素资料,认为额尔古纳地块在中-新元古代时期曾发生一次重要的地壳增生事件,与兴安地块主要为显生宙地壳的特点明显不同.
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修回日期:  2006-08-22
刊出日期:  2007-02-28

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