安徽省黄梅尖碱性岩体铀成矿地球化学特征
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摘要
黄梅尖碱性岩体是庐枞盆地乃至安徽省铀矿地质找矿工作的重点目标和找矿对象。笔者对黄梅尖碱性岩体的蚀变岩石、赋矿围岩、铀矿石进行了化学成分特征和微量元素地球化学研究,结果表明:赋矿围岩具有富钾、碱质高、贫钙镁,以及铝过饱和的特点,其源区可能来源于富集地幔,并受到壳源物质的混染;铀成矿作用过程中,主量元素(Al、Mg、Ca)、微量元素(Sr、Th、Zr、Ta、Nb、U、Hf、Cu、Pb、Zn)和稀土元素明显富集,亲硫元素(Cu、Pb、Zn)可作为寻找铀矿化的指示元素;成矿流体具有深源特征。
Huangmeijian alkaline pluton is the key uranium geology prospecting target in Luzong basin and even in Anhui province.The study on main and trace elements of ores,hosting and alterated rocks indicated that the hosting rock is rich in potassium,high in alkali,poor in calcium and magnesium,and prealuminous,which suggest the rock may be derived from the mantle and contaminated with crust source material.In the process of uranium mineralization main elements Al,Mg,Ca and trace elements Sr,Th,Zr,Ta,Nb,U,Hf,Cu,Pb,Zn and rare earth elements are obvious enriched,Sulfur elements Cu,Pb,Zn can be used as the indicator for uranium mineralization and the ore-forming fluid has the characteristics of deep source.
Huangmeijian alkaline pluton is the key uranium geology prospecting target in Luzong basin and even in Anhui province.The study on main and trace elements of ores,hosting and alterated rocks indicated that the hosting rock is rich in potassium,high in alkali,poor in calcium and magnesium,and prealuminous,which suggest the rock may be derived from the mantle and contaminated with crust source material.In the process of uranium mineralization main elements Al,Mg,Ca and trace elements Sr,Th,Zr,Ta,Nb,U,Hf,Cu,Pb,Zn and rare earth elements are obvious enriched,Sulfur elements Cu,Pb,Zn can be used as the indicator for uranium mineralization and the ore-forming fluid has the characteristics of deep source.
引文
[1]熊欣,徐文艺,杨竹森,等.庐枞盆地高温铀钍矿化特征、成因及其找矿意义——来自砖桥科学深钻ZK01的证据[J].岩石学报,2014,30(4):1017-1030.
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[3]周涛发,范裕,袁峰,等.庐枞盆地侵入岩的时空格架及其对成矿的制约[J].岩石学报,2010,26(9):2694-2714.
[4]朱杰辰.大龙山、昆山富铀矿形成地质条件及成因的同位素地质研究.核工业北京地质研究院,1989.
[5]范裕,周涛发,袁峰,等.安徽庐江-枞阳地区A型花岗岩的LA-ICP-MS定年及其地质意义[J].岩石学报,2008,24(8):1715-1723.
[6]周伟伟.郯庐断裂带晚中生代富碱侵入岩年代学、岩石地球化学及其地质意义[D].北京:中国地质大学,2014.
[7]李献华,周汉文,刘颖,等.粤西阳春中生代钾玄质侵入岩及其构造意义:I.岩石学和同位素地质年代学[J].地球化学,2000,29(6):513-520.
[8]Hofmann A W.Chemical differentiation of the earth:The relationship between mantle,continental crust,and oceanic crust[J].Earth Planet.sci.lett.,1988,90:297-314.
[2]曹毅,杜杨松,蔡春麟,等.安徽庐枞地区中生代A型花岗岩类及其岩石包体:在碰撞后岩浆演化过程中的意义[J].高校地质学报,2008,14(4):565-576.
[3]周涛发,范裕,袁峰,等.庐枞盆地侵入岩的时空格架及其对成矿的制约[J].岩石学报,2010,26(9):2694-2714.
[4]朱杰辰.大龙山、昆山富铀矿形成地质条件及成因的同位素地质研究.核工业北京地质研究院,1989.
[5]范裕,周涛发,袁峰,等.安徽庐江-枞阳地区A型花岗岩的LA-ICP-MS定年及其地质意义[J].岩石学报,2008,24(8):1715-1723.
[6]周伟伟.郯庐断裂带晚中生代富碱侵入岩年代学、岩石地球化学及其地质意义[D].北京:中国地质大学,2014.
[7]李献华,周汉文,刘颖,等.粤西阳春中生代钾玄质侵入岩及其构造意义:I.岩石学和同位素地质年代学[J].地球化学,2000,29(6):513-520.
[8]Hofmann A W.Chemical differentiation of the earth:The relationship between mantle,continental crust,and oceanic crust[J].Earth Planet.sci.lett.,1988,90:297-314.
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