辽东岫岩北部王家堡子一带富铝片麻岩的变质作用及其地质意义
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  • 英文篇名:Metamorphism and its geological implication of Al-rich gneiss in Wangjiapuzi of northern Xiuyan area,East Liaoning
  • 作者:甘宜成 ; 董永胜 ; 王鹏森 ; 陈木森 ; 王成志
  • 英文作者:GAN Yi-cheng;DONG Yong-sheng;WANG Peng-sen;CHEN Mu-sen;WANG Cheng-zhi;College of Earth Sciences,Jilin University;
  • 关键词:辽—吉造山带 ; 南辽河岩群 ; 富铝片麻岩 ; 变质作用 ; P--T轨迹 ; 辽东
  • 英文关键词:Liao--Ji orogenic belt;;South Liaohe Group;;Al-rich gneiss;;metamorphism;;P-T path;;East Liaoning
  • 中文刊名:世界地质
  • 英文刊名:Global Geology
  • 机构:吉林大学地球科学学院;
  • 出版日期:2019-05-06 09:04
  • 出版单位:世界地质
  • 年:2019
  • 期:03
  • 基金:国家自然科学基金重点项目(41430210);; 中国地质调查局地质调查项目(DD20160121)
  • 语种:中文;
  • 页:45-57
  • 页数:13
  • CN:22-1111/P
  • ISSN:1004-5589
  • 分类号:P588.345;P542
摘要
高级变质富铝片麻岩出露于辽东岫岩北部王家堡子一带南辽河岩群变质岩石中,通过详细的岩相学和变质作用研究,确定其变质峰期典型矿物组合为Sil+Grt+Crd+Bt+Pl+Kfs+Qz;峰期后存在典型的减压反应Grt+Sil+Qz→Crd。早期进变质阶段以出现十字石、蓝晶石为特征,晚期退变质阶段以石榴石变斑晶和黑云母转变为绿泥石为特征。传统地质温压计估算的富铝片麻岩峰期变质条件为:T=640℃~690℃,P=5. 5~7. 0 kbar;峰期后减压阶段变质条件为:T=560℃~660℃,P=4. 7~4. 9kbar;晚期退变质条件为:T=520℃~560℃,P=2. 9~3. 0 kbar。矿物组合特征、矿物相转变结构及其温压条件变化反映其具有近等温减压的顺时针P--T轨迹演化特征,不同于前人所获得的逆时针P--T轨迹。研究结果认为南、北辽河岩群在古元古代可能经历了相同的变质作用演化过程。
        The study on petrography and metamorphism of aluminum-rich gneiss occurred in South Liaohe Group in Wangjiapuzi of northern Xiuyan area,East Liaoning has been carried out. The peak mineral assemblage consists of garnet + sillimanite + cordierite + biotite + plagioclase + k-feldspar + quartz,and there is a typical decompression reaction of garnet + sillimanite + quartz→cordierite after peak stage. Early prograde metamorphic stage is characterized by the occurrence of staurolite and kyanite,whereas the late retrograde metamorphic stage is characterized by the transformation of garnet and biotite into chlorite. Traditional P--T estimation suggests that the metamorphic conditions for peak stage are 640℃ ~ 690℃ and 5. 5 ~ 7. 0 kbar of aluminum-rich gneiss,560℃ ~ 660℃and 4. 7 ~ 4. 9 kbar for post-peak near-isothermal decompression stage,and 520℃ ~ 560℃ and 2. 9 ~ 3. 0 kbar for late retrograde metamorphic stage. The characteristics of mineral assemblage,transition structure of mineral phase and P--T conditions of aluminum-rich gneiss indicate a clockwise P-T path with near isothermal decompression,which is different from the counterclockwise P--T path obtained by predecessors. The results show that South Liaohe Group and North Liaohe Group probably underwent the same metamorphic evolution process in Paleoproterozoic.
引文
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