山东石岛花岗岩复合岩体的侵位深度与苏鲁超高压变质岩的快速折返机制及动力学效应

曾令森 陈晶 陈振宇 刘静 梁凤华 高利娥. 山东石岛花岗岩复合岩体的侵位深度与苏鲁超高压变质岩的快速折返机制及动力学效应[J]. 岩石学报, 2007, 23(12): 3171-3179.
引用本文: 曾令森 陈晶 陈振宇 刘静 梁凤华 高利娥. 山东石岛花岗岩复合岩体的侵位深度与苏鲁超高压变质岩的快速折返机制及动力学效应[J]. 岩石学报, 2007, 23(12): 3171-3179.
Emplacement depth of the Shidao granitic complex and the rapid exhumation of the Sulu ultrahigh pressure rocks: New constraints on the mechanisms for rapid exhumation[J]. Acta Petrologica Sinica, 2007, 23(12): 3171-3179.
Citation: Emplacement depth of the Shidao granitic complex and the rapid exhumation of the Sulu ultrahigh pressure rocks: New constraints on the mechanisms for rapid exhumation[J]. Acta Petrologica Sinica, 2007, 23(12): 3171-3179.

山东石岛花岗岩复合岩体的侵位深度与苏鲁超高压变质岩的快速折返机制及动力学效应

  • 基金项目:

    国家自然科学研究基金(40673027);科技部973基础研究项目(2003CB716504);国土资源部百人计划项目(A2503).

Emplacement depth of the Shidao granitic complex and the rapid exhumation of the Sulu ultrahigh pressure rocks: New constraints on the mechanisms for rapid exhumation

  • 山东石岛正长岩-花岗岩复合岩体形成于225~205Ma之间,侵入到苏鲁超高压岩石中.通过铝在角闪石的压力计,确定了年龄约为225~215Ma的甲子山岩体的侵位深度,约为15km.结合前人对石岛花岗岩复合岩体的地质年代学和地球化学及本研究结果,表明(1)石岛正长岩在225~215Ma期间快速侵位小于15km的深度,同时快速冷却结晶;(2)在215Ma或早些时候,苏鲁最东端的超高压岩石已位于小于15km的深度;(3)苏鲁超高压岩石以大于5mm/yr的速率快速折返.俯冲板片前锋的断离所导致的深部动力学效应可能是苏鲁超高压岩石快速折返的主要驱动力.这种深部动力学过程导致软流圈地幔的快速上涌,诱发岩石圈地幔的部分熔融,形成钾质岩浆,可能是华北克拉通在中生代发生大规模伸展作用及减薄的初始驱动力.
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刊出日期:  2007-12-31

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