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    太行山重力梯度带的形成与华北岩石圈减薄的时空差异性有关

    徐义刚

    徐义刚, 2006. 太行山重力梯度带的形成与华北岩石圈减薄的时空差异性有关. 地球科学, 31(1): 14-22.
    引用本文: 徐义刚, 2006. 太行山重力梯度带的形成与华北岩石圈减薄的时空差异性有关. 地球科学, 31(1): 14-22.
    XU Yi-gang, 2006. Formation of the Taihangshan Gravity Lineament by the Diachronous Lithospheric Thinning of the North China Craton. Earth Science, 31(1): 14-22.
    Citation: XU Yi-gang, 2006. Formation of the Taihangshan Gravity Lineament by the Diachronous Lithospheric Thinning of the North China Craton. Earth Science, 31(1): 14-22.

    太行山重力梯度带的形成与华北岩石圈减薄的时空差异性有关

    基金项目: 

    中国科学院“百人计划”项目 49925308

    国家自然科学基金项目 40234046

    详细信息
      作者简介:

      徐义刚(1966-), 男, 研究员, 从事地幔岩石学和地球化学研究.E-mail: yigangxu@gig.ac.cn

    • 中图分类号: P588.14

    Formation of the Taihangshan Gravity Lineament by the Diachronous Lithospheric Thinning of the North China Craton

    • 摘要: 通过对比华北太行山重力梯度带两侧新生代玄武岩及其中幔源包体的成分, 发现: (1)华北东、西部新生代玄武岩具有相反的演化趋势, 说明新生代以来西部岩石圈逐渐减薄, 而东部岩石圈逐渐加厚; (2)西部岩石圈地幔组成相对复杂, 年龄多为晚太古代-元古代; 而东部岩石圈地幔组成相对单一, 年龄多为现代值, 少数为元古代; (3)西部壳幔过渡带较厚而东部较薄, 反映两地不同的岩浆底侵作用程度.华北岩石圈组成的空间不均一性可能与岩石圈减薄过程的时空差异有关. 岩相古地理分析说明太行山重力梯度带的雏形形成于早白垩世, 与华北中生代岩浆活动的高峰相吻合.由于岩浆作用与岩石圈减薄作用密切相关, 因此认为华北岩石圈减薄的时空不均一性是形成太行山重力梯度带的重要机制.

       

    • 图  1  (a) 中国大陆布格重力异常图和(b)华北克拉通构造简图和新生代裂谷系分布

      图a据Ma(1989)修改, 阴影部分显示了重力梯度带的位置; 图b据Xu(2002)修改, 2条虚线分别代表了Zhao et al.(2001)划分的华北克拉通中央带的西界和东界

      Fig.  1.  (a) Bouguer gravity map of China showing Daxing'anling-Taihangshan gravity lineament; (b)Simplified map showing distribution of Cenozoic rifting systems and tectonic division in the North China craton

      图  2  华北东部和西部新生代玄武岩中包体的εNd(t)值柱状图

      数据来源: Song and Frey (1989); Tatsumoto et al.(1992); Fan et al.(2000); Xu et al.(1998); Xu (2002); Xu and Bodinier (2004); Rudnick et al.(2004); Xu et al.(2003); 刘讲峰和徐义刚(待刊).大洋玄武岩的εNd范围据Hofmann (2003)

      Fig.  2.  Histogram ofεNd of basalt-borne xenoliths from the western and eastern North China craton

      图  3  华北新生代玄武岩及典型克拉通幔源包体的187Os/188Os柱状图

      数据来源: 华北据Gao et al.(2002); Wu et al.(2003); Xu et al.(unpublished).典型克拉通据Pearson et al.(1995a, 1995b); Carlson et al.(2004).深海橄榄岩据Snow and Reisberg (1995)

      Fig.  3.  Comparison of187 Os/188 Os of basalt-borne xenoliths from (a) western and (b) eastern North China craton with (c)those of typical cratonic peridotites

      图  4  华北东、西部岩石圈热梯度和壳幔过渡带性质对比

      数据来源: Xu et al.(1998); Chen et al.(2001); Liu et al.(2001); Huang et al.(2004)

      Fig.  4.  Comparison of xenolith-derived geotherm and crust-mantle transition at (a) Hannuoba (western North China cra-ton) and (b) Nushan (eastern North China craton)

      图  5  华北克拉通早白垩世岩相古地理(据Wang(1985)修改)

      Fig.  5.  Paleogeography during Early Cretaceous in North China craton

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