大别造山带早白垩世基性岩的同位素特征及下地壳物质对岩浆源区的贡献

李全忠,谢智,徐夕生,陈江峰,高天山. 大别造山带早白垩世基性岩的同位素特征及下地壳物质对岩浆源区的贡献[J]. 岩石学报, 2008, 24(8).
引用本文: 李全忠,谢智,徐夕生,陈江峰,高天山. 大别造山带早白垩世基性岩的同位素特征及下地壳物质对岩浆源区的贡献[J]. 岩石学报, 2008, 24(8).
LI QuanZhong,XIE Zhi,XU XiSheng,CHEN JiangFeng,GAO TianShan. The isotopic characteristics of the Early-Cretaceous mafic rocks from Dabie Orogenic Belt and the contribution of the lower crust to the magma source[J]. Acta Petrologica Sinica, 2008, 24(8).
Citation: LI QuanZhong,XIE Zhi,XU XiSheng,CHEN JiangFeng,GAO TianShan. The isotopic characteristics of the Early-Cretaceous mafic rocks from Dabie Orogenic Belt and the contribution of the lower crust to the magma source[J]. Acta Petrologica Sinica, 2008, 24(8).

大别造山带早白垩世基性岩的同位素特征及下地壳物质对岩浆源区的贡献

  • 基金项目:

    国家自然科学基金,国家重点基础研究发展计划(973计划)

The isotopic characteristics of the Early-Cretaceous mafic rocks from Dabie Orogenic Belt and the contribution of the lower crust to the magma source

  • 大别造山带中生代岩浆岩的物质来源和成因机制,是大陆碰撞造山带研究的热点和前沿问题之一.本文通过对北大别椒子岩和沙村岩体的早白垩世基性岩进行全岩的主量、微量元素特别是Pb-Sr-Nd同位素研究,探讨了北大别基性岩的岩浆源区性质及下地壳的贡献.椒子岩基性岩的(87Sr/86Sr);的范围为0.7072~0.7075,εNd(t)范围为-10.4~11.9;椒子岩和沙村基性岩的(206Pb/204Pb)i为16.464~17.394,(207Pb/204Pb)i为15.349~15.453,(208Pb/204Pb)i为37.338~37.976.这样的同位素组成显示岩浆源区中下地壳物质的贡献显著;尤其Pb同位素特征表明下地壳贡献来自大别造山带自身的下地壳.下地壳物质的参与可能与拆沉有关.
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刊出日期:  2008-08-31

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