辽西义县组玄武岩捕虏晶的发现及其意义
Discovery of xenocrysts in basalts of Yixian Formation in west Liaoning Province and its significance. Acta Petrologica Sinica
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摘要: 辽西早白垩世义县组底部有一套镁含量较高（MgO=8％～10％）的橄榄玄武岩，有人称之为“高镁玄武岩”。通过这些玄武岩所含的橄榄石、单斜辉石的形态特征、环带结构以及所包含不透明矿物的研究，笔者认为它们属于地幔捕虏晶。捕虏晶和玄武质熔体反应的结果形成了环带结构，由于捕虏晶比玄武质熔体富Mg、Ni、Cr，贫Fe、Mn、Ca，因此作用结果提高了熔体的镁含量。此外，辉石的反环带以及复杂环带结构反映了两种熔体的混合作用。因此上述橄榄石、辉石捕虏晶的发现有助于揭示：1）岩石圈地幔和熔体相互作用以及高镁岩石的成因；2）两种熔体的混合作用。这一发现对进一步研究华北中生代岩石圈地幔的改造与破坏，理解华北克拉通东部中生代地球动力学背景和构造环境是有意义的。
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Key words:
- West Liaoning Province /
- Mesozoic /
- Olivine /
- Clinopyroxene /
- Xenocryst /
- Zoned structure
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