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四川甲基卡两类锂辉石矿体共存机制及其找矿意义
Received:October 15, 2019  Revised:October 15, 2019  点此下载全文
Cite This Paper:YANG Yueqing,WANG Denghong,LIU Shanbao,LIU Lijun,WANG Chenghui,GUO Weiming.2020.The co- occurrence mechanism of two types of spodumene ore bodies and their prospecting significance in Jiajikan, Sichuan Province[J].Acta Geologica Sinica,94(1):287-302
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Author NameAffiliationE-mail
YANG Yueqing MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing, 100037 1347581781@qq.com 
WANG Denghong MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing, 100037  
LIU Shanbao MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing, 100037  
LIU Lijun MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing, 100037  
WANG Chenghui MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing, 100037  
GUO Weiming MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing, 100037  
基金项目:本文为国家重点研发计划(编号2017YFC0602700; 2017YFC0602701)、中国地质调查项目(编号 DD20160055; DD20160055; DD20160346; DD20190379)联合资助成果。
中文摘要:甲基卡已成为我国最大的硬岩型锂资源基地,目前已查明数个超大型锂辉石矿床,其矿床工业类型主要为花岗伟晶岩型,但在近几年对深部锂矿产的勘查中,除了继续发现有花岗伟晶岩型矿体外,还发现一种粒度明显偏细的锂矿石,野外称之为细晶岩,但经室内认真观察表明,它们具有非常典型的花岗结构,锂辉石在其中以自形—半自形晶较均匀分布,含量在5%~22%,长石包括微斜长石和钠长石,结合其他工作确定,这应是在我国首次发现的富锂辉石碱长花岗岩。在含矿脉体中,它和富锂辉石的花岗伟晶岩密切伴生,但形成时间较晚。在一些矿床(段)中,碱长花岗岩型矿石中的锂储量还明显高过花岗伟晶岩型。花岗伟晶岩型和花岗岩型锂辉石矿共伴生,这在国内也是首例,其特殊的成岩成矿作用与三叠纪末松潘 甘孜造山带中构造 岩浆 穹窿体的形成有密切的成因联系,它使含矿花岗伟晶岩和花岗岩仅集中发育于一定的接触变质带中,并相伴生产出。这一发现,不仅丰富了甲基卡地区锂矿石类型,也为花岗伟晶岩和花岗岩成岩成矿作用理论的深入探讨提供了非常好的实验基地。
中文关键词:甲基卡  花岗伟晶岩  碱长花岗岩  锂辉石- 磷锂铝石  构造- 岩浆- 热穹窿
 
The co- occurrence mechanism of two types of spodumene ore bodies and their prospecting significance in Jiajikan, Sichuan Province
Abstract:With the identification of several large spodumene deposits, Jiajika has become the largest source of hard rock lithiumin China. The previously identified industrial ore deposit is the granitic pegmatite type. However, during the exploration of deep lithium resources in recent years, an additional type of fine grained lithium ore called aplite in the fieldwas also found. However, careful observation in the laboratory showed that they have a very typical granitic structure in which spodument(5%~22%) is evenly distributed as idiomorphic and semi- idiomorphic crystals; feldspar is known from previous studies to include microcline and albite. This is the first known spodument rich alkali- feldspar granite found in China. In the ore- bearing body, it is closely associated with the spodument- rich pegmatite, but its formation time is relatively late. In some ore deposits, the reserves of lithium in alkali granite- type ore are higher than those in the granite- pegmatite type. In the first known case in China, both granitic pegmatite and granitic type spodumene ores coexist. The special diagenesis and mineralization are closely related to the formation of tectono- magmatic domes in the Songpan- Ganzi orogenic belt at the end of the Triassic. It caused mineral- bearing pegmatites and granites to develop together only in certain contact metamorphic zones. This discovery not only greatly expands the lithium resources in the Jiajika orefield, but also provides a very good experimental base for an in- depth discussion of the diagenesis and mineralization theory of granitic pegmatite and granite.
keywords:Jiajika  granitic pegmatite  alkali- feldspar granite  spodument- amblygonite  tectono- magmatic- thermal dome
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