Metallogeny and resource potential of lithium-beryllium granites and pegmatites in the Altyn Tagh
The Altyn Tagh region,as a belt of the Proto-Tethys tectonic belts,has not been paid attentions to the exploration and study of lithium(Li)and beryllium(Be)deposits for long time.After detailed analyses of geological data,we found that the Altyn Tagh region has potential for Li and Be mineralization.Then,we firstly enter the Altyn Tagh region to survey and search Li and Be deposits in 2018,and discovered many pegmatite-type Li-Be deposits.In this contribution,we summarized characteristics and metallogeny of these deposits in the Central Altyn Tagh as follows:(1)the pegmatites exhibit a diversity of types,reflecting regional zonation,with some displaying complex internal zonation;(2)the Li-Be pegmatites are the result of the granitic evolution in the area,with a regional zonation from biotite granite to two-mica granite,muscovite granite,albite granite,tourmaline granite,and various types of pegmatites including beryl,cassiterite,spodumene,lepidolite,and pollucite pegmatite;(3)these granites and pegmatites were products of the fractional crystallization of granitic magma,originating from biotite dehydration melting of meta-argillaceous sandstones under granulite facies conditions;this process is influenced by the regionally tectonic evolution.The pegmatite-type Li-Be deposits in the Tugeman region of Altyn Tagh are attributed to the convergence and collision between the Central Altyn and South Altyn blocks,while the deposits in the Tamuqie and Southern Washixia region adjacent to the Tatebulake batholith resulted from the ultimate collision of three continental blocks.With abundant Early Paleozoic granitic intrusions and favorable geological settings,the Central Altyn Tagh is anticipated to be a significant lithium resource for China.
Granite-pegmatiteLithium-beryllium depositMetallogenyResource potentialityThe Altyn Tagh
万方数据
维普
