引用本文：杨岳清,王登红,刘善宝,刘丽君,王成辉,郭唯明.2020.四川甲基卡两类锂辉石矿体共存机制及其找矿意义[J].地质学报,94(1):287-302. 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.
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.