CAJ | 학술논문

初步分析了纳多弄地区辉绿岩的岩石地球化学特征。研究区辉绿岩为钙碱性系列，总体低TiO2。部分样品Sr元素相对亏损，中等负Eu异常，大离子亲石元素（LILE）相对富集，轻稀土（LREE）相对富集，而其余样品无Sr，Eu异常，无大离子亲石元素（LILE）及轻稀土（LREE）富集。据岩石地球化学对比结果，认为其兼具 MORB 与 OIB 特征。结合班公湖-怒江洋盆构造演化历史，纳多弄辉绿岩应是班公湖-怒江洋盆向南的俯冲作用在冈瓦纳北部陆缘形成的弧后扩张盆地环境的产物。
초보분석료납다롱지구휘록암적암석지구화학특정。연구구휘록암위개감성계렬，총체저TiO2。부분양품Sr원소상대우손，중등부Eu이상，대리자친석원소（LILE）상대부집，경희토（LREE）상대부집，이기여양품무Sr，Eu이상，무대리자친석원소（LILE）급경희토（LREE）부집。거암석지구화학대비결과，인위기겸구 MORB 여 OIB 특정。결합반공호-노강양분구조연화역사，납다롱휘록암응시반공호-노강양분향남적부충작용재강와납북부륙연형성적호후확장분지배경적산물。
Major and trace elements of diabases from the Naduonong area in Luolong (Eastern Tibet) are reported in this study.The diabases all belong to calc-alkaline series and have moderate TiO2 contents.Some of the samples have Sr and mediocre Eu depletion,and have low-grade LILE and LREE enrichment.Other samples have no obvious Sr and Eu depletion,no LILE and LREE enrichment.It is similar to both E-MORB and typical arc basalts.It is proposed that the Naduonong diabases were formed in an arc-backarc environment which was formed by southward subduction of the Ban-gonghu-Nujiang oceanic crus.