峨眉山大火成岩省和西伯利亚大火成岩省地球化学物征的比较及其成因启示

被引:28
作者
张招崇
王福生
郝艳丽
John J.Mahoney
机构
[1] 中国地质科学院地质研究所
[2] School of Ocean and Earth Science and Technology
[3] University of Hawaii
[4] Honolulu
[5] HI
[6] USA
关键词
地球化学特征; 地幔柱; 成因; 峨眉山大火成岩省; 西伯利亚大火成岩省;
D O I
暂无
中图分类号
P594 [自然作用地球化学]; P588.1 [岩浆岩(火成岩)];
学科分类号
摘要
峨眉山大火成岩省和西伯利亚大火成岩省是发生于二叠 -三叠纪之交的重要岩浆事件。它们在主要元素、微量元素和Sr、Nd、Pb同位素特征上具有相似姓 ,但是峨眉山大火成岩省的不相容元素比值和同位素比值的变化范围相对要小一些。相对而言 ,峨眉山玄武岩具有高的Fe8和Sm/Yb值 ,暗示了其熔融深度较西伯利亚大火成岩省深 ,而熔融程度较低 ,两者的源区均为石榴石二辉橄榄岩。根据Nd同位素特征估算峨眉山和西伯利亚地幔柱的 Nd≈ 2 ,接近于原始地幔特征。综合其他地球化学特征 ,认为两个大火成岩省可能起源于同一个来自于核 -幔边界的超级地幔柱
引用
收藏
页码:12 / 20
页数:9
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