新疆阿尔泰东部新生代玄武岩的地球化学特征与地质意义

张元元 郭召杰 刘畅 许文骞. 新疆阿尔泰东部新生代玄武岩的地球化学特征与地质意义[J]. 岩石学报, 2007, 23(7): 1730-1738.
引用本文: 张元元 郭召杰 刘畅 许文骞. 新疆阿尔泰东部新生代玄武岩的地球化学特征与地质意义[J]. 岩石学报, 2007, 23(7): 1730-1738.
ZHANG YuanYuan, GUO ZhaoJie , LIU Chang , XU WenQian. Geochemical characteristics and geologic implications of Cenozoic basalts, east Altai, Xinjiang[J]. Acta Petrologica Sinica, 2007, 23(7): 1730-1738.
Citation: ZHANG YuanYuan, GUO ZhaoJie , LIU Chang , XU WenQian. Geochemical characteristics and geologic implications of Cenozoic basalts, east Altai, Xinjiang[J]. Acta Petrologica Sinica, 2007, 23(7): 1730-1738.

新疆阿尔泰东部新生代玄武岩的地球化学特征与地质意义

  • 基金项目:

    国家重点基础研究规划项目课题(2007CB411305和2001CB409804)、国家自然科学基金项目(40572123)的资助.在研究和成文过程中得到北京大学韩宝福教授、朱永峰教授的指导,同位素年代学分析过程中北京大学季建清博士、刘玉琳博士给予指导和帮助,《岩石学报》的两位匿名审稿人提出了有益修改意见,在此向他们表示衷心的感谢!

Geochemical characteristics and geologic implications of Cenozoic basalts, east Altai, Xinjiang

  • 新疆阿尔泰东部哈拉乔拉出露有新生代玄武岩,K—Ar法测得玄武岩的年龄在10~20Ma,地球化学分析结果表明哈拉乔拉玄武岩具有高TiO2含量、高钾富碱的特点,属于典型的橄榄玄粗岩系列;强烈富集不相容元素和轻稀土元素,显示出源区富集的特点。(^87Sr/^86Sr).为0.704432~0.704538,(^143Nd/^144Nd)i为0.512641~0.512779,εNd(t)为0.29~1.03,其Sr-Nd同住素特征和地球化学特征都与洋岛玄武岩(OIB)相似。La/Nb(0.765~0.823)、Nb/U(35.02~52.01)等不相容元素的比值指示了源区中可能存在少量循环地壳物质。综合对比南天山托云等地区新生代玄武岩,中亚地区的地球化学性质相似的新生代火山岩分布零星,空间上与大型断裂相对应,不应是前人地幔柱成因的观点。本文结合中亚地区古生代地壳的演化特点,提出中亚地区的新生代类OIB型玄武岩来源于中亚地区已被改造的富集地幔。
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修回日期:  2007-03-22
刊出日期:  2007-07-31

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