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    地壳与弱化岩石圈地幔的相互作用: 以燕山造山带为例

    路凤香 郑建平 张瑞生 邵济安 李伍平 余淳梅

    路凤香, 郑建平, 张瑞生, 邵济安, 李伍平, 余淳梅, 2006. 地壳与弱化岩石圈地幔的相互作用: 以燕山造山带为例. 地球科学, 31(1): 1-7.
    引用本文: 路凤香, 郑建平, 张瑞生, 邵济安, 李伍平, 余淳梅, 2006. 地壳与弱化岩石圈地幔的相互作用: 以燕山造山带为例. 地球科学, 31(1): 1-7.
    LU Feng-xiang, ZHENG Jian-ping, ZHANG Rui-sheng, SHAO Ji-an, LI Wu-ping, YU Chun-mei, 2006. Interaction between Crust and Weakening Lithospheric Mantle: Taking the Yanshan Orogenic Belt as an Example. Earth Science, 31(1): 1-7.
    Citation: LU Feng-xiang, ZHENG Jian-ping, ZHANG Rui-sheng, SHAO Ji-an, LI Wu-ping, YU Chun-mei, 2006. Interaction between Crust and Weakening Lithospheric Mantle: Taking the Yanshan Orogenic Belt as an Example. Earth Science, 31(1): 1-7.

    地壳与弱化岩石圈地幔的相互作用: 以燕山造山带为例

    基金项目: 

    教育部博士点基金项目 20010491010

    国土资源部基础研究专项计划 20001010203

    国家自然科学基金项目 40372103

    详细信息
      作者简介:

      路凤香(1935-), 女, 教授, 博士生导师, 从事岩石学研究E-mail: lufx@263.net

    • 中图分类号: P58

    Interaction between Crust and Weakening Lithospheric Mantle: Taking the Yanshan Orogenic Belt as an Example

    • 摘要: 燕山造山带中生代发育4期钙碱性火山活动, 它们的源区组成都是受壳幔相互作用的制约, 其中髫髻山组和义县组分布广泛, 具有代表性.髫髻山组岩性比较单一, 地球化学参数变化范围小, 岩浆的AFC作用不强烈, 源区成分不复杂.依据Kay et al.(1991)的方法, 估算了早-中侏罗世燕山地区的地壳厚度为40-45 km.髫髻山组粗安岩是在加厚的地壳(40-45 km)条件下, 源区是含角闪石的石榴石麻粒岩+底侵的基性岩的壳幔过渡带熔融形成.义县组火山岩的源区为下地壳+岩石圈地幔, 地幔组分较髫髻山组增加.研究区中生代早期地壳开始加厚, 发生下地壳拆沉, 进入流变学性质改变了的“弱化的岩石圈地幔”, 二者发生作用.岩石圈地幔在中生代晚期受到流体、熔体、地幔矿物中活化的分子水、剪切构造作用, 以及温、压条件改变的影响, 导致岩石圈地幔发生不均一的局部弱化, 为容纳拆沉的下地壳提供了优化场所.推测弱化岩石圈地幔出现于135 Ma以后燕山地区发育的小型拉伸盆地之下, 以及对应的小型软流圈底辟体之上.上述模型可以与俯冲带的楔形地幔与俯冲洋壳的相互作用相对比.

       

    • 图  1  燕山造山带中生代火山岩Sr/Y-Y图解

      1.髫髻山组和蓝旗组; 2.义县组; 3.自右上方至左下方为: 宽甸玄武岩(0.27 Ma)、碱锅玄武岩(106 Ma)9件平均和汉诺坝玄武岩(10~22 Ma)

      Fig.  1.  Sr/Y vs.Y diagram of Mesozoic volcanic rocks in Yanshan orogenic belt

      图  2  Sr/Y-SiO2图解

      1.髫髻山组火山岩; 2.义县组中基性火山岩

      Fig.  2.  Sr/Y vs. SiO2 diagram

      图  3  髫髻山组、义县组及中新生代玄武岩中的(La/Nb)N分布频率

      1.辽西喀参1井蓝旗组(陈义贤等, 1997); 2.大台及燕翅髫髻山组(李伍平等, 2001a, 2001b); 3.辽西建昌蓝旗组(李伍平, 1999); 4.辽西建昌蓝旗组(张瑞生, 2005); 5.冀北下板城蓝旗组(李伍平和李献华, 2004); 6.辽西义县组(李伍平, 1999); 7.辽西惠德营子义县组(陈义贤等, 1997); 8.彰武叶茂台义县组(陈义贤等, 1997); 9.辽西建昌及凌源义县组(张瑞生, 2005); 10.辽宁碱锅新生代玄武岩(张宏福和郑建平, 2003); 11.辽宁宽甸新生代玄武岩(张宏福和郑建平, 2003); 12.河北汉诺坝新生代玄武岩(支霞臣和冯家麟, 1992)

      Fig.  3.  (La/Nb)N distribution frequence of Middle Cenozoic basalts in Tiaojishan and Yixian formations

      图  4  K1时期辽西及邻区火山-沉积盆地的壳-幔作用模型

      1.小规模的软流层地幔热底辟体; 2.岩浆源区; 3.盆地内的火山活动; 4.壳幔作用带; 5.下地壳下部; 6.弱化后的岩石圈; 7.岩石圈

      Fig.  4.  Crust-mantle interaction model of volcanic sedimen-tary basin during K1 period in west Liaoning and its adjacent areas

      表  1  燕山地区中一晚侏罗世与早白垩世火山岩特征对比

      Table  1.   Characteristic comparison between Early to Middle Jurassic and Early Cretaceous volcanic rocks in Yanshan area

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