琼中麻粒岩的成因:稀土元素地球化学制约:《华南地质与矿产》2006年02期

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h*o0b;X`0^0琼中麻粒岩的成因:稀土元素地球化学制约

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徐德明 马大铨 张业明 付太安 谢才富

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【摘要】:稀土元素地球化学分析表明,琼中麻粒岩可以分为“高Ti”麻粒岩(TiO2含量大于1.0%)和“低Ti”麻粒岩(TiO2含量低于1.0%)两种化学类型。“高Ti”麻粒岩以稀土总量高,轻稀土高度富集,轻、重稀土强烈分馏为特征,稀土配分曲线呈右倾单斜型,与本区变基性火山岩的稀土分布特征相似;低“Ti”麻粒岩以稀土总量较低,轻稀土分馏强烈,但重稀土分馏不明显为特征,稀土配分曲线呈重稀土平坦的左高右低型,与许多浅成基性岩的稀土分布特征相似;认为琼中麻粒岩形成于晋宁期的可能性最大。两类麻粒岩的识别,有利于深化对琼中杂岩形成和演化过程的认识。

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【作者单位】:水利论文*\|5q3v:oe ]

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【关键词】:水利论文!M&Py3S/N}E

Z`!s(L,^$n;g0麻粒岩 稀土元素地球化学 岩石成因 琼中

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5E6MsNF;y4TF0【基金】:国土资源大调查项目(200013000127)水利论文0KK6gQ%C_e

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【分类号】:P581

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【正文快照】:水利论文j!oKor qjy

&? W!a%^'toz0琼中麻粒岩最早发现于20世纪90年代初①,马大铨等[1]已对麻粒岩的岩石和矿物学特征进行了简要介绍,张业明等[2]则对其形成时代进行了初步研究,但都很少论及麻粒岩的成因。琼中前寒武纪高级变质杂岩是海南岛迄今发现的唯一达麻粒岩相的变质地体,麻粒岩的成因问题对了解海南岛水利论文J.ej1a/R!e[

下一篇:岩石密度测量在黑龙江伊春地区花岗岩体就位机制研究中的应用:《华南地质与矿产》2006年02期
上一篇:广西-湖南灌(阳)县-下层铺地区新发现钨锡钼矿点:《华南地质与矿产》2006年01期
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