湘南骑田岭岩体的稀有金属地球化学特征及其含矿性研究  

Geochemical Characteristics and Ore Potential of Rare Metal Elements of the Qitianlin Batholith in South Hunan, China

作　　者：何晗晗[1] 王登红[1] 苏晓云[2] 张怡军 王国瑞[1] 李建康[1] 赵斌[4] 李建国[4] 

机构地区：[1]中国地质科学院矿产资源研究所,北京100037 [2]中国地质大学(北京)地球科学与资源学院,北京100083 [3]湖南省湘南地质勘察院,湖南郴州423000 [4]山西省地球物理化学勘查院,山西运城044004

出　　处：《大地构造与成矿学》2014年第2期366-374,共9页Geotectonica et Metallogenia

基　　金：国家深部探测技术与实验研究专项"南岭成矿带地壳岩浆系统结构探测实验"课题(编号:SinoProbe 0301);中国地质大调查项目"南岭岩浆岩成矿专属性"(编号:1212011120989)和"我国重要矿产和区域成矿规律研究"(编号:1212010633903)资助

摘　　要：骑田岭岩体位于湖南省郴州市,为一中生代复式岩体。本文运用电感耦合等离子质谱技术(ICP-MS)对穿越骑田岭岩体的大剖面上的花岗岩样品,进行了稀有金属Li、Rb、Sr、Cs、Nb、Ta、Be、Zr、Hf含量分析测试。结果表明:(1)岩体明显富集Li、Rb、Cs、Be、Zr,高于华南燕山期花岗岩平均值,Sr、Nb、Ta则相对亏损;(2)Li、Rb、Cs等稀有金属自西向东逐渐升高,Sr则逐渐降低,Nb、Ta、Hf等除了个别地方出现"特高值"之外,基本保持稳定;(3)相比于同时期的邻区香花岭岩体,骑田岭岩体虽然富集了一定量的稀有金属,但要形成或找到香花岭这样的稀有金属矿床还要注意剥蚀、保存条件。结合地球物理特征和岩体地质特征,认为骑田岭岩体自南东向北西斜向侵位的可能性很大,这可能也是造成骑田岭岩体稀有金属元素分带的原因。The Qitianling granites in Chenzhou city, Hunan province, is a Mesozoic batholith. In this study, granitic rock samples across the Qitianling Geological-Geochemical-Geophysical profile were analyzed by Inductively Coupled Plasma Mass Spectrometry （ICP-MS） to measure the concentrations of rare metal elements, including Li, Rb, Sr, Cs, Nb, Ta, Be, Zr, Hf. The results showed that：（1） samples are significantly enriched in Li, Rb, Cs, Be and Zr, which are higher than the average concentrations of granite in South China, while elements like Sr, Nb and Ta are relatively depleted;（2） the concentrations of elements like Li, Rb, Cs increase gradually from west to east of the batholith, while the concentrations of Sr is gradually decrease. Elements like Nb, Ta and Hf remain stable except occasional “peak value”; （3） compared with the neighborhood Xianghualing pluton that is genetically related to the Xianghualing rare metal deposit, the Qitianling batholith is of the same geological stage, but the rare metal contents in Qitianling are not so high as to be a potential or as a target for exploration. That is to say, it is difficult to find new rare metal deposits as those formed around the Xianghualing pluton, considering the rare metal contents and stronge erosion of the Qitianling batholith. Based on the geophysical and geological characteristics of the rocks, it is considered that the Qitianling batholith was intruded from southeast to northwest, which might be the cause of rare element zonation across the Qitianling batholith.

关 键 词：骑田岭岩体 稀有金属 元素地球化学 含矿性 侵位机制 

分 类 号：P595[天文地球—地球化学] P612[天文地球—地质学]