太行山-大兴安岭构造岩浆带中生代侵入岩Nd、Sr、Pb同位素特征及物质来源探讨

蔡剑辉 阎国翰 肖成东 王关玉 牟保磊 张任祜. 太行山-大兴安岭构造岩浆带中生代侵入岩Nd、Sr、Pb同位素特征及物质来源探讨[J]. 岩石学报, 2004, 20(5): 1225-1242.
引用本文: 蔡剑辉 阎国翰 肖成东 王关玉 牟保磊 张任祜. 太行山-大兴安岭构造岩浆带中生代侵入岩Nd、Sr、Pb同位素特征及物质来源探讨[J]. 岩石学报, 2004, 20(5): 1225-1242.
CAI JianHui~. Nd, Sr, Pb isotopic characteristics of the Mesozoic intrusive rocks in the Taihang-Da Hinggan Mountains Tectonomagmatic Belt and their source region[J]. Acta Petrologica Sinica, 2004, 20(5): 1225-1242.
Citation: CAI JianHui~. Nd, Sr, Pb isotopic characteristics of the Mesozoic intrusive rocks in the Taihang-Da Hinggan Mountains Tectonomagmatic Belt and their source region[J]. Acta Petrologica Sinica, 2004, 20(5): 1225-1242.

太行山-大兴安岭构造岩浆带中生代侵入岩Nd、Sr、Pb同位素特征及物质来源探讨

  • 基金项目:

    地矿部直管局项目,国家教委博士点基金(99000141)

Nd, Sr, Pb isotopic characteristics of the Mesozoic intrusive rocks in the Taihang-Da Hinggan Mountains Tectonomagmatic Belt and their source region

  • 太行山-大兴安岭构造岩浆带是中国东部中生代大规模岩浆活动的集中区,它纵跨华北克拉通和兴蒙海西造山带两个大地构造单元,既是我国东部规模最大的北北东向深大断裂带之一,又是我国东部北北东向延伸的地壳厚度陡变带与重力异常高梯度带,因而具有十分重大的地质意义。本文针对研究区在中生代岩浆活动物质来源认识方面的不足,首次对太行山-大兴安岭整个构造岩浆带40余个代表性岩体的Nd、Sr、Pb同位素地球化学特征进行了全面系统的研究,发现不同区段(南、北太行山地区、大兴安岭中-南地区)、不同侵入期次(早、中、晚)岩石具有明显不同的Nd、Sr、Pb同位素特征,可以推断其岩浆源区性质各不相同:南太行山地区基-中性岩浆均来源于富集地幔储库;北太行山地区早期基-中性岩浆主要来源于富集地幔的部分熔融;中期中-酸性岩浆来源与下地壳关系密切;晚期富碱质中-酸性岩浆来源可能与下地壳、甚至中地壳物质有关;大兴安岭地区中-酸性岩浆来源与亏损地幔关系密切,可能源自与亏损地幔有联系的年轻的下地壳。由此表明,中生代华北克拉通地区岩石圈地幔为富集地幔,而兴蒙造山带地区岩石圈地幔则为亏损地幔。此外,根据岩石的Nd模式年龄,初步认为2543~1485Ma可能指示华北克拉通岩石圈地幔发生富集作用的时间,而983~540Ma则可能为大兴安岭地区地壳生长的一个重要时期。
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修回日期:  2004-03-30
刊出日期:  2004-09-30

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