峨眉山高钛玄武岩物源的不均一性研究
HETEROGENEITY OF SOURCE FOR EMEISHAN HIGH-Ti BASALTS
查看参考文献24篇
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文摘
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对二滩地区高钛玄武岩物源研究表明,该区岩石可分为高钛-1和高钛-2两种岩石类型。其反映了二滩高钛玄武岩浆物源的不均一性,这种不均一性主要表现在：1）微量元素Zr,Sr含量明显不同；2）部分熔融程度和熔融压力不同；3）岩浆的结晶分异不同；4）Pb同位素比值不同。这可能是深源地幔柱（来自核-幔边界或下地幔）在上升过程中携带的不同物质发生部分熔融所致。 |
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其他语种文摘
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Some new data of Pb isotopes from Ertan high-Ti basalts is presented in this paper. The study indicates that Ertan high-Ti（HT） basalts can be subdivided into HT-1 type and HT-2 type. This implies that sources of the Ertan HT basalts are heterogeneous. This heterogeneity is mainly： 1） contents of Zr and Sr for HT-1 and HT-2 are significantly defferent;2） HT-1 and HT-2 have different degrees of partial melting;3） HT-1 and HT-2 have undergone different processes of magmatic evolution,their trends of fractional crystallization are different;4） ratios of Pb isotopes between HT-1 and HT-2 are different. This is probably related to mantle plumes （from core-mantle boundary layers or lower mantle）. When plumes rose and carried different materials at different mantle depth, these materials underwent distinct degrees of partial melting, resulted in the differences for HT-1 and HT-2 basalts. |
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来源
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矿物岩石
,2007,27(4):60-65 【核心库】
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关键词
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高钛玄武岩
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部分熔融程度
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结晶分异
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Pb同位素
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源区不均一
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地址
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1.
中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵州, 贵阳, 550002
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重庆煤田地质研究所, 重庆, 400042
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中国科学院研究生院, 北京, 100039
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-6872 |
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学科
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地质学 |
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基金
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国家自然科学基金
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文献收藏号
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CSCD:3110896
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