若尔盖510-1铀矿床方解石、石英微量元素地球化学特征
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摘要
本文通过对若尔盖510-1铀矿床中与铀成矿作用密切相关的热液矿物——成矿期方解石、石英的微量元素地球化学特征进行研究,结果表明成矿期方解石和石英中含量较高的微量元素种类基本一致,相对富含V、Ni、Zn、Sr、Ba、U等元素,且其微量元素相对于原始地幔的配分曲线形态亦基本一致,说明形成方解石和石英的成矿流体来源相同。总体上两者的稀土配分模式都呈相对平坦型,尤其是方解石的稀土配分模式与球粒陨石十分相似,可能暗示形成方解石的成矿流体具有一定的幔源特征。相关性分析表明,方解石中U与Sc、Y、Mo、Sb、Hf、Re呈明显的正相关,石英中U与V、Co、Ni、Cu、Zn、Ba呈明显的正相关,U与Co、Ni、Hf等深源元素相关的事实反映了形成矿床的成矿流体应当来源于深部。而方解石、石英中与U相关性较好的微量元素种类差异很大,这可能是形成方解石和石英的同源流体在后期演化过程中其所萃取的元素种类不同所致。
This paper makes an analysis of the geochemical characteristics of trace elements of hydrothermal minerals,such as calcite and quartz on metallogenic epoch which are closely related with uranium mineralization in the Zoige. 510- 1uranium deposit. Results show that the kinds of trace elements that are higher concentration in calcite is basically consistent with that in quartz. They are relatively rich in V,Ni,Zn,Sr,Ba,U and other elements. Shape of trace elements distribution of them patterns compared with the primitive mantle are consistent,which indicates that the metallogenic fluid forming calcite and quartz are the same. Overall,both rare earth distribution patterns are belong to a relatively flat type,especially rare earth distribution patterns are very similar with that of chondritic,suggesting that the ore- forming fluid of formation of calcite has certain characteristics of mantle source. Correlation analysis manifests that there are obviously correlation between U and Sc、Y、Mo、Sb、Hf、Re in calcite,and between U and V、Co、Ni、Cu、Zn、Ba in quartz. The correlation of U and deep- source elements such as Co,Ni,Hf reflects that the metallogenic fluid should derive from deep- source. The Kinds of trace elements that correlate well with U in calcite and quartz are very different,which may be caused by difference kinds of trace elements extracted by the metallogenic fluid forming calcite and quartz in the later evolution process.
This paper makes an analysis of the geochemical characteristics of trace elements of hydrothermal minerals,such as calcite and quartz on metallogenic epoch which are closely related with uranium mineralization in the Zoige. 510- 1uranium deposit. Results show that the kinds of trace elements that are higher concentration in calcite is basically consistent with that in quartz. They are relatively rich in V,Ni,Zn,Sr,Ba,U and other elements. Shape of trace elements distribution of them patterns compared with the primitive mantle are consistent,which indicates that the metallogenic fluid forming calcite and quartz are the same. Overall,both rare earth distribution patterns are belong to a relatively flat type,especially rare earth distribution patterns are very similar with that of chondritic,suggesting that the ore- forming fluid of formation of calcite has certain characteristics of mantle source. Correlation analysis manifests that there are obviously correlation between U and Sc、Y、Mo、Sb、Hf、Re in calcite,and between U and V、Co、Ni、Cu、Zn、Ba in quartz. The correlation of U and deep- source elements such as Co,Ni,Hf reflects that the metallogenic fluid should derive from deep- source. The Kinds of trace elements that correlate well with U in calcite and quartz are very different,which may be caused by difference kinds of trace elements extracted by the metallogenic fluid forming calcite and quartz in the later evolution process.
引文
[1]赵振华.七十年代地质地球化学进展——微量元素地球化学研究进展[M].中国科学院地球化学研究所编.贵州人民出版社,1980.
[2]赵振华.微量元素地球化学[J].地球科学进展,1992,7(5):65-66.
[3]周家喜,黄智龙,周国富,等.黔西北桥铅锌矿床热液方解石C-O同位素和REE地球化学[J]大地构造与成矿学,2012,56(4):513-524.
[4]周家喜,黄智龙,周国富,等.黔西北赫章天桥铅锌矿成矿物质来源:S-Pb同位素和REE制约[J]地质评论,2010,56(4):513-524.
[5]陈友良,侯明才,朱西养,等.若尔盖铀矿田含矿岩系的岩石特征及成因探讨[J].成都理工大学学报(自然科学版),2007,53(4):555-558.
[6]陈友良若尔盖510-1铀矿床微量元素垂直分带特征研究[J]矿物学报2013,33(S2).196-198.
[7]赵兵,金景福.若尔盖铀成矿带区域地层(岩石)地球化学[J].地质地球化学,1996,24(5):28-31.
[8]Sun S S,Mc Donough W F.Chemical andisotopic systematics of oceanic basatts:Implication for mantle composition and process[C]∥Saunders A D,Norry MJ,eds.Magmatismin the Ocean Basin.London:Geological Society Publishing House,1989:313-345.
[2]赵振华.微量元素地球化学[J].地球科学进展,1992,7(5):65-66.
[3]周家喜,黄智龙,周国富,等.黔西北桥铅锌矿床热液方解石C-O同位素和REE地球化学[J]大地构造与成矿学,2012,56(4):513-524.
[4]周家喜,黄智龙,周国富,等.黔西北赫章天桥铅锌矿成矿物质来源:S-Pb同位素和REE制约[J]地质评论,2010,56(4):513-524.
[5]陈友良,侯明才,朱西养,等.若尔盖铀矿田含矿岩系的岩石特征及成因探讨[J].成都理工大学学报(自然科学版),2007,53(4):555-558.
[6]陈友良若尔盖510-1铀矿床微量元素垂直分带特征研究[J]矿物学报2013,33(S2).196-198.
[7]赵兵,金景福.若尔盖铀成矿带区域地层(岩石)地球化学[J].地质地球化学,1996,24(5):28-31.
[8]Sun S S,Mc Donough W F.Chemical andisotopic systematics of oceanic basatts:Implication for mantle composition and process[C]∥Saunders A D,Norry MJ,eds.Magmatismin the Ocean Basin.London:Geological Society Publishing House,1989:313-345.