| 河北省涞源、阜平一带煌斑岩的地球化学特征及其成因初探 |
| |
| 引用本文： | 杨军.河北省涞源、阜平一带煌斑岩的地球化学特征及其成因初探[J].现代地质,1991(3). |
| |
| 作者姓名： | 杨军 |
| |
| 作者单位： | 中国建筑材料科学研究院石英玻璃研究所 |
| |
| 摘 要： | 河北涞源、阜平一带煌斑岩的地球化学特征表明其来源于地幔,非花岗岩演化成因,有的脉保持原生岩浆的特点,有的脉发生了一定程度的分离结晶,分离结晶对轻稀土影响较大,而对重稀土影响较小,分离结晶作用还导致了Cr,Ni,Sr的逐渐贫化,Ba和Co等元素的逐渐富集。
|
| 关 键 词： | 碱性煌斑岩 钙碱性煌斑岩 河北涞源、阜平 |
THE GEOCHEMICAL FEATURES AND THEIR GENESISOF LAMPROPHYRES IN LAIYUAN - FUPINGAREA, HEBEI PROVINCE, CHINA |
| |
| Yang Jun.THE GEOCHEMICAL FEATURES AND THEIR GENESISOF LAMPROPHYRES IN LAIYUAN - FUPINGAREA, HEBEI PROVINCE, CHINA[J].Geoscience——Journal of Graduate School,China University of Geosciences,1991(3). |
| |
| Authors: | Yang Jun |
| |
| Abstract: | :
The distribution patterns of rare earth elements for lamprophyres in Laiyuan-Fuping area of LREE-rich type, normalized to chondritic meteorite. The abundance of LREE in alkali lamprophyres is bigger than that in calc-alkaline lamprophyres. These characteristics suggest that the lamprophyres probably came from the upper mantle. The distribution patterns of transitional elements normalized to both chondritic meteorite and the mantle source all show W - shape. The dyke XII -7 which is Grand Ni-rich with the Mg/ (Mg+Fe) of 0. 75 can be considered as the primitive magma directly derived from the upper mantle. According to the above - mentioned characteristics the lamprophyres in the area interested cannot be derived from granitic magma. Moreover, the abundances of Cr, Ni and Sr in lamprophyres show a reductive tendency with respect to crystal differentiation, implying that fractionation of megacrysts such as Cr-bearing diopside, anorthoclase and olivine took place during the evolution of lamprophyre magma. In general, the geochemical features of the lamprophyres in the area studied suggest that they were likely mantle-derived rocks formed from either primary lamprophyre magma or its derivitive magmas that underwent fractional crystallization. |
| |
| Keywords: | : alkali lamprophres Calc- alkaline lamprophyres Laiyuan - Fuping Hebeiprovince |
| 本文献已被 CNKI 等数据库收录！ |
|
