| 一种判别原始岩浆的方法--以苦橄岩和碱性玄武岩为例 |
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| 引用本文： | 张招崇,王福生.一种判别原始岩浆的方法--以苦橄岩和碱性玄武岩为例[J].吉林大学学报(地球科学版),2003,33(2):130-134. |
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| 作者姓名： | 张招崇 王福生 |
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| 作者单位： | 中国地质科学院地质研究所,北京,100037 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，国家自然科学基金，G1999043205，40172026,40273020，， |
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| 摘 要： | 在前人工作基础上，利用橄榄石和熔浆的Fe—Mg分配乐数，重新制作了MgO—Fo—FeO图解，该图解的优点在于其适用范围更宽，既可用于超基性的苦橄岩，也可用于一般的玄武岩或橄榄玄粗岩系。同时介绍了该图解运用的方法，并且以峨眉山大火成岩省中苦橄岩和黑龙江镜泊湖地区全新世碱性玄武岩为例，说明如何应用该图解来恢复原始岩浆以及解释岩石的成因。研究结果表明，峨眉山大火成岩省中的苦橄岩部分代表了原始岩浆，部分有过剩橄榄石的加入，部分为演化的岩浆形成。与苦橄岩密切共生的辉斑玄武岩是苦橄质岩浆通过橄榄石的分离结晶作用形成的，而在峨眉山大火成岩省中占绝对优势的温流玄武岩则不是苦橄质岩浆简单的分离结晶作用形成。镜泊湖地区的碱性玄武岩均为演化的岩浆，而碧玄岩演化程度较低，碱玄岩则是原始岩浆高度演化的产物。
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| 关 键 词： | 橄榄石 苦橄岩 橄榄玄粗岩系 火成岩 岩浆 碱性玄武岩 |
| 文章编号： | 1671-5888(2003)02-0130-05 |
| 修稿时间： | 2002年6月17日 |
A METHOD FOR IDENTIFYING PRIMARY MAGMA--EXAMPLES FROM PICRITE AND ALKALI BASALTS |
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| ZHANG Zhao-cho ng,WANG Fu-sheng.A METHOD FOR IDENTIFYING PRIMARY MAGMA--EXAMPLES FROM PICRITE AND ALKALI BASALTS[J].Journal of Jilin Unviersity:Earth Science Edition,2003,33(2):130-134. |
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| Authors: | ZHANG Zhao-cho ng WANG Fu-sheng |
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| Abstract: | Based on the previous study, the MgO-Fo-FeO diagram is rebui lt via Fe-Mg distribution coefficient between olivine and melt. The advantage of t he new diagram is its widely applicable, e.g., picrites, basalts and shoshon ites. It is also pointed out how the diagram is applied. To show how to recover the composition of primary magma and to explain the petrogenesis, the picrites f rom the Emeishan large igneous province and Holocene alkali basalts from the Jin gpohu, Heilongjiang province, are taken for examples. It shows that some of picr ites represent primary magma, some of them have excess olivines whereas some are evolved magma. Pyroxene-phyric basalts closely associated with picrites are gen erated by fractional crystallization of olivines from picritic magma, whereas fl ood basalts that are dominated in the Emeishan large igneous province are not pr oduced by a simple fractional crystallization from picritic magma. In contrast, all alkali basalts from the Jingpohu area are evolved magma. However , basani tes are relatively low evolved while tephrites are highly evolved. |
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| Keywords: | primary magma excess olivines evolved magma distributi on coefficient |
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