甘肃北山榴辉岩的变质历史
  修订日期:2001-07-30  点此下载全文
引用本文:刘晓春,吴淦国,陈柏林,舒斌.2002.甘肃北山榴辉岩的变质历史[J].地球学报,23(1):25-29.
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作者单位
刘晓春 中国地质科学院地质力学研究所北京100081 
吴淦国 中国地质大学北京100083 
陈柏林 中国地质科学院地质力学研究所北京100081 
舒斌 中国地质科学院地质力学研究所北京100081 
基金项目:国土资源部地质行业科技发展基金资助项目(编号:HY979809)
中文摘要:岩相学、矿物化学和变质条件的估算表明,甘肃北山榴辉岩经历了前榴辉岩相(604-678℃、0.89-1.95GPa)、榴辉岩相(700-720℃、1.2-1.5GPa)、角闪岩相(629℃、0.63-0.83GPa)和绿片岩相(约400℃、0.3-0.4GPa)4个演化阶段。这一P-T轨迹证明北山榴辉岩是塔里木板块与哈萨克斯坦板块在俯冲-碰撞过程中地壳增厚作用的产物。
中文关键词:榴辉岩  变质历史  北山
 
Metamorphic History of Eclogites from Beishan, Gansu Province
Abstract:Based on the study of petrography and mineral chemistry and the estimation of metamorphic conditions, the authors recognized four metamorphic stages in eclogites from Beishan, Gansu Province, western China. The earlier pre eclogite facies assemblage of Al rich amphibole + zoisite + quartz preserved in the garnet crystals was formed at 604~678 ℃ and 0.89~1.05 GPa. Eclogite facies metamorphism characterized by the assemblage of garnet + omphacite + quartz + rutile equilibrated under the condition of 700~720 ℃ and 1.2~1.5 GPa. The retrograde amphibolite facies stage produced paragenesis of amphibole + plagioclase + quartz + titanite at 629 ℃ and 0.63 ~0.83 GPa. The formation of greenschist facies metamorphism represented by actinolite + chlorite finally took place at about 400 ℃ and 0.3~0.4 GPa. This P T path implies that the crust was thickened abruptly, caused by subduction during the collision of Talimu and Kazakhstan plates, and the subsequent exhumation might be attributed to rapid tectonic uplift.
keywords:eclogite  metamorphic history  Beishan
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