粤北石人嶂钨矿床稀土元素地球化学特征及其指示意义
|
摘要
通过系统研究与成矿关系密切的莲花山花岗岩以及钨矿脉、云英岩和旁侧花岗岩的稀土元素地球化学特征,并进行对比分析,探讨粤北石人嶂钨矿床的成矿环境与成矿物质来源。研究表明,面型云英岩与脉侧云英岩以及相关的两类花岗岩的稀土元素组成存在明显差异,具有不同的物质来源,显示两期岩浆侵入与热液活动叠加特点;深部3种花岗岩及其脉侧云英岩的稀土配分模式很相似,表明具有相同的物质与热液来源;隐伏花岗岩体从浅部到深部,稀土总量、δEu值逐渐变小,显示岩浆岩结晶分异程度逐渐增强,为钨矿床形成提供了成矿物质来源;云英岩与花岗岩的稀土配分模式具有一定相似性,都是轻稀土富集,强烈铕亏损,而石英脉大多呈铕富集,相对富集轻稀土;随着成矿时间的推移,成矿环境由还原到相对氧化。因此,石人嶂钨矿床成矿热液与晚期岩浆热液具有相似性和继承性,成矿物质来源除了深部的白云母花岗岩,部分可能来自上部地壳。
By systematically comparing REE geochemical characteristics of granite in Mt. Lianhuashan,tungsten veins,greisen and side-granite which has close relationship with mineralization,the paper discussed the metallogenic environment and sources of Shirenzhang tungsten deposit in northern Guangdong. It has been shown that REE components of facial-type greisen,vein-side greisen and two types of related granite are obvious different. They have different material sources,which infer to two stages of magmatic intrusion and superimposed hydrothermal activity. The REE patterns of three types of granite in the deep tungsten vein and its veinside greisen are very similar,indicating the same substances and hydrothermal sources. ΣREE and δEu of the hidden granite body gradually increase from shallow to deep,showing that the degree of magmatic crystallization differentiation gradually decreased,providing mineral source for the formation of tungsten deposit. REE patterns of greisen and granite have certain similarities,LREE enrichment and a strong negative Eu anomaly. But most quartz veins have a positive Eu anomaly,enriched in LREE relatively. As mineralization time goes by,metallogenic environment changes from the reducing to the relative oxidizing. Therefore,there are similarities and inheritance between ore-forming hydrotherm of Shirenzhang tungsten deposits and late magmatic hydrotherm. Above all,these results suggested that the metallogenic material may be also partly from upper crust in addition to muscovite granite in the deep.
By systematically comparing REE geochemical characteristics of granite in Mt. Lianhuashan,tungsten veins,greisen and side-granite which has close relationship with mineralization,the paper discussed the metallogenic environment and sources of Shirenzhang tungsten deposit in northern Guangdong. It has been shown that REE components of facial-type greisen,vein-side greisen and two types of related granite are obvious different. They have different material sources,which infer to two stages of magmatic intrusion and superimposed hydrothermal activity. The REE patterns of three types of granite in the deep tungsten vein and its veinside greisen are very similar,indicating the same substances and hydrothermal sources. ΣREE and δEu of the hidden granite body gradually increase from shallow to deep,showing that the degree of magmatic crystallization differentiation gradually decreased,providing mineral source for the formation of tungsten deposit. REE patterns of greisen and granite have certain similarities,LREE enrichment and a strong negative Eu anomaly. But most quartz veins have a positive Eu anomaly,enriched in LREE relatively. As mineralization time goes by,metallogenic environment changes from the reducing to the relative oxidizing. Therefore,there are similarities and inheritance between ore-forming hydrotherm of Shirenzhang tungsten deposits and late magmatic hydrotherm. Above all,these results suggested that the metallogenic material may be also partly from upper crust in addition to muscovite granite in the deep.
引文
[1]严成文,李文铅,孔唐荣,等.石人嶂钨矿岩浆与成矿作用对中国东部燕山期构造响应浅谈[J].中国钨业,2008,32(2):8-12.
[2]严成文,李文铅,李社宏,等.粤北石人嶂钨矿成矿机理及成矿构造背景[J].中国钨矿,2009,24(1):12-28.
[3]李社宏,李文铅,赵凤生,等.瑶岭-石人嶂钨矿构造动力特征探讨[J].中国钨业,2008,23(3):1-6.
[4]朱文凤,杨国高,韦龙明,等.广东石人嶂钨矿床银矿物特征[J].桂林工学院学报,2009,29(3):285-291.
[5]朱文凤,韦龙明,杨国高,等.石人嶂钨矿床放射性矿物的赋存状态及成分特征[J].桂林理工大学学报,2012,32(1):14-19.
[6]韦龙明,林锦富,李文铅,等.广东梅子窝钨矿“五层楼”叠加现象探讨[J].地质学报,2008,82(7):888-893.
[7]韦龙明,汪劲草,朱文凤,等.广东石人嶂-梅子窝钨矿研究新进展[J].桂林工学院学报,2008,28(2):151-156.
[8]张少琴,朱文凤,韦龙明.产铀花岗岩体中的晶质铀矿的若干特征——以粤北石人嶂钨矿为例[J].中国矿业,2009,18(11):104-106.
[9]付建明,李华芹,屈文俊,等.粤北始兴地区石英脉型钨矿成矿时代的确定及其地质意义[J].大地构造与成矿学,2008,32(1):57-62.
[10]韦龙明,王莉,张广辉,等.广东石人嶂钨矿床中的晶质铀矿研究[J].地质学报,2014,88(4):805-813.
[11]冯日照.广东始兴县石人嶂钨矿成矿地质条件与成矿规律研究[D].桂林:桂林理工大学,2008.
[12]李明君.广东石人嶂钨矿花岗岩类地质特征及与钨矿化关系探讨[D].桂林:桂林理工大学,2013.
[13]朱金初,徐士进.华南含钨锡花岗岩的稀土地球化学特征和岩石成因[J].矿床地质,1989,8(3):21-31.
[14]史长义,鄢明才,刘崇民,等.中国花岗岩类化学元素丰度及特征[J].地球化学,2005,34(5):470-482.
[15]付建明,马吕前,谢才富,等.湖南金鸡岭铝质A型花岗岩的厘定及构造环境分析[J].地球化学,2005,34(30):215-226.
[16]赵振华,熊小林,韩小东.花岗岩稀土元素四分组效应形成机理探讨——以千里山和巴尔哲花岗岩为例[J].中国科学:D辑,1999,29(4):33l-338.
[17]Irber W.The lanthanide tetrad effect and its correlation with K/Rb,Eu/Eu*,Sr/Eu,Y/Ho and Zr/Hf of evolving peraluminous granite suites[J].Geochimica et Cosmochimica Acta.1999,63(3/4):489-508.
[18]Boynton W V.Cosmochemistry of the rare earth elements:meteorite studies[M]//Rare Earth Element Geochemistry.Amsterdam:Elsevier,1984:63-114.
[19]林伟圣.江西省石英脉型钨矿床黑钨矿中稀土元素的组成特点[J].地质与勘探,1988(2):17-22.
[20]华仁民,张文兰,顾晟彦,等.南岭稀土花岗岩、钨锡花岗岩及其成矿作用的对比[J].岩石学报,2007,23(10):2321-2328.
[21]覃日贤.广东石人嶂钨矿云英岩矿化及钨矿化多样性研究[D].桂林:桂林理工大学,2013.
[22]杨帆,肖荣阁,白凤军,等.江西赣州淘锡坑钨矿床稀土地球化学研究[J].地质与勘探,2013,49(6):1139-1152.
[23]雷新勇,岳书仓.广东莲花山钨矿床成岩-成矿稀土元素地球化学研究[J].地质与勘探,1989(3):15-20.
[24]林小明,陈国能,冯佐海,等.粤北梅子窝钨矿成矿机理[J].桂林工学院学报,2008,28(3):301-306.
[25]孙红英.粤北瑶岭钨矿成矿流体地球化学与成矿机制[D].广州:中山大学,2010.
[26]刘慷怀.广西珊瑚锡矿稀土元素的地球化学[J].桂林冶金地质学院学报,1990,10(3):251-260.
[27]刘正庚,余景明,刘升友,等.湖南沃溪金锑钨矿床稀土元素特征研究[J].矿床地质,2000,19(3):270-280.
[28]卢焕章.华南钨矿成因[M].重庆:重庆出版社,1986.
[2]严成文,李文铅,李社宏,等.粤北石人嶂钨矿成矿机理及成矿构造背景[J].中国钨矿,2009,24(1):12-28.
[3]李社宏,李文铅,赵凤生,等.瑶岭-石人嶂钨矿构造动力特征探讨[J].中国钨业,2008,23(3):1-6.
[4]朱文凤,杨国高,韦龙明,等.广东石人嶂钨矿床银矿物特征[J].桂林工学院学报,2009,29(3):285-291.
[5]朱文凤,韦龙明,杨国高,等.石人嶂钨矿床放射性矿物的赋存状态及成分特征[J].桂林理工大学学报,2012,32(1):14-19.
[6]韦龙明,林锦富,李文铅,等.广东梅子窝钨矿“五层楼”叠加现象探讨[J].地质学报,2008,82(7):888-893.
[7]韦龙明,汪劲草,朱文凤,等.广东石人嶂-梅子窝钨矿研究新进展[J].桂林工学院学报,2008,28(2):151-156.
[8]张少琴,朱文凤,韦龙明.产铀花岗岩体中的晶质铀矿的若干特征——以粤北石人嶂钨矿为例[J].中国矿业,2009,18(11):104-106.
[9]付建明,李华芹,屈文俊,等.粤北始兴地区石英脉型钨矿成矿时代的确定及其地质意义[J].大地构造与成矿学,2008,32(1):57-62.
[10]韦龙明,王莉,张广辉,等.广东石人嶂钨矿床中的晶质铀矿研究[J].地质学报,2014,88(4):805-813.
[11]冯日照.广东始兴县石人嶂钨矿成矿地质条件与成矿规律研究[D].桂林:桂林理工大学,2008.
[12]李明君.广东石人嶂钨矿花岗岩类地质特征及与钨矿化关系探讨[D].桂林:桂林理工大学,2013.
[13]朱金初,徐士进.华南含钨锡花岗岩的稀土地球化学特征和岩石成因[J].矿床地质,1989,8(3):21-31.
[14]史长义,鄢明才,刘崇民,等.中国花岗岩类化学元素丰度及特征[J].地球化学,2005,34(5):470-482.
[15]付建明,马吕前,谢才富,等.湖南金鸡岭铝质A型花岗岩的厘定及构造环境分析[J].地球化学,2005,34(30):215-226.
[16]赵振华,熊小林,韩小东.花岗岩稀土元素四分组效应形成机理探讨——以千里山和巴尔哲花岗岩为例[J].中国科学:D辑,1999,29(4):33l-338.
[17]Irber W.The lanthanide tetrad effect and its correlation with K/Rb,Eu/Eu*,Sr/Eu,Y/Ho and Zr/Hf of evolving peraluminous granite suites[J].Geochimica et Cosmochimica Acta.1999,63(3/4):489-508.
[18]Boynton W V.Cosmochemistry of the rare earth elements:meteorite studies[M]//Rare Earth Element Geochemistry.Amsterdam:Elsevier,1984:63-114.
[19]林伟圣.江西省石英脉型钨矿床黑钨矿中稀土元素的组成特点[J].地质与勘探,1988(2):17-22.
[20]华仁民,张文兰,顾晟彦,等.南岭稀土花岗岩、钨锡花岗岩及其成矿作用的对比[J].岩石学报,2007,23(10):2321-2328.
[21]覃日贤.广东石人嶂钨矿云英岩矿化及钨矿化多样性研究[D].桂林:桂林理工大学,2013.
[22]杨帆,肖荣阁,白凤军,等.江西赣州淘锡坑钨矿床稀土地球化学研究[J].地质与勘探,2013,49(6):1139-1152.
[23]雷新勇,岳书仓.广东莲花山钨矿床成岩-成矿稀土元素地球化学研究[J].地质与勘探,1989(3):15-20.
[24]林小明,陈国能,冯佐海,等.粤北梅子窝钨矿成矿机理[J].桂林工学院学报,2008,28(3):301-306.
[25]孙红英.粤北瑶岭钨矿成矿流体地球化学与成矿机制[D].广州:中山大学,2010.
[26]刘慷怀.广西珊瑚锡矿稀土元素的地球化学[J].桂林冶金地质学院学报,1990,10(3):251-260.
[27]刘正庚,余景明,刘升友,等.湖南沃溪金锑钨矿床稀土元素特征研究[J].矿床地质,2000,19(3):270-280.
[28]卢焕章.华南钨矿成因[M].重庆:重庆出版社,1986.