福建永定大坪铌钽矿化花岗斑岩体的流体演化对铌钽富集的制约

被引：5

作者：

刘永超 ^{[1
]}

李建康 ^{[1
]}

邹天人 ^{[1
]}

江善元 ^{[2
]}

丁欣 ^{[3
]}

王娴 ^{[3
]}

机构：

[1] 中国地质科学院矿产资源研究所

[2] 中国冶金地质总局第二地质勘察院

[3] 中国地质大学地球科学与资源学院

来源：

地质学报 | 2017年 / 91卷 / 05期

关键词：

流体包裹体; 熔体包裹体; 铌钽; 大坪斑岩体; 福建永定;

D O I：

暂无

中图分类号：

P618.79 [铌]; P618.86 [钽];

学科分类号：

0709 ; 081803 ;

摘要：

福建永定大坪铌钽矿化花岗斑岩体位于永定县城南部的大石凹-蓝地火山喷发盆地,对斑岩型铌钽矿床的产出具有重要的指示意义。本文通过岩相学、显微测温和激光拉曼等实验对大坪岩体ZK10001和ZK10401钻孔不同深度岩石样品中的流体和熔体包裹体进行了研究,试图揭示岩体的熔体-流体演化过程,分析铌钽等成矿元素的富集机制。观测结果表明,大坪岩体主要发育气液两相盐水溶液包裹体和硅酸盐熔体包裹体。流体包裹体均一温度集中在175～225℃,盐度集中在3%～7%NaCleq,密度集中在0.75～0.95g/cm3,成矿流体主要为中低温、低盐度和低密度的流体,总体属于H2O-NaCl体系。熔体包裹体主要分布于石英斑晶雪球结构的环带中,含有钠长石、石英和钽铁矿等子矿物。熔体包裹体完全均一温度较高,能够代表早期原始岩浆的组成。研究表明,大坪岩体的原始岩浆富铌钽等成矿元素和碱性组分,大坪岩体的铌钽矿化是岩浆高度分异的产物,铌钽的富集过程经历了斑晶阶段和基质阶段等两阶段结晶分异过程:在早期斑晶结晶阶段,少量铌钽矿物与斑晶一起结晶,并被斑晶包裹;岩浆演化晚期发生流体出溶现象,但未分异出大量流体,F等挥发分促进了铌钽在结晶残余熔体中富集,并在基质间隙中沉淀。大坪矿化岩体的存在指示出斑岩型铌钽矿床存在的可能性。

引用

页码：1052 / 1065

页数：14

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