期刊文献+

西藏古堆地区煌斑岩地球化学特征及其构造意义 被引量:13

Geochemical Characteristics and Tectonic Significance of Lamprophyre in the Gudui Area of Tibet
下载PDF
导出
摘要 近些年许多学者对煌斑岩的研究较多,但对藏南地区的煌斑岩研究甚少。本文通过对藏南古堆地区煌斑岩进行了主量元素、稀土及微量元素的研究,以便了解藏南古堆地区的构造演化环境。结果表明:煌斑岩中SiO_2含量为32.99%~52.62%,平均值41.39%,K_2O/Na_2O为0.01~2.31,平均值为0.73,为碱性玄武岩系列。岩石地球化学特征表明:以富集大离子亲石元素(如K、Ba),高场强元素相对亏损(如Ta、Zr)为特征,但高场强元素Nb相对富集。煌斑岩的成因具有幔源特征,是在新特提斯洋形成后经扩张,在岩石圈拉张伸展的动力学构造背景下,致使岩石圈减薄、地幔物质上涌,并遭受地壳物质混染而形成的。 In recent years, many scholars have studied lamprophyre, while little attention has focused on this rock in southern Tibet. This article presents a study of the lamprophyrethe from the Gudui area of southern Tibet on its main elements, rare earth and trace elements in the south Tibetan to further understand the tectonic evolution of the environment there. The results show that the content of SiO2 in the lamprophyre is 32.99~52.62%, 41.39% on average; K2O/Na2O is 0.01~2.31, with average 0.73 , representing an alkali basalt series. Rock geochemical characteristics show enrichment in large ion lithophile elements (such as K, Ba), relative loss of high field strength elements (such as Ta, Zr), and the high field strength element Nb is relatively rich. Mantle source characterizes the genesis of the lamprophyre, which was formed in the Neo-Tethys after the extension of the lithosphere, which made the lithospheric thinning, mantle material upwell, and crustal material contamination.
出处 《地质与勘探》 CAS CSCD 北大核心 2017年第2期300-309,共10页 Geology and Exploration
基金 中国地质调查局西藏古堆地区金锑多金属矿产远景调查(编号:1212011121236)资助
关键词 煌斑岩 岩石地球化学特征 构造环境 古堆 西藏 lamprophyre, rock geochemical characteristics, tectonic environment, Gudui,Tibet
  • 相关文献

参考文献26

二级参考文献413

共引文献915

同被引文献258

引证文献13

二级引证文献64

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部