| It is the largest rare metal mining area in China,and also the largest solid lithium mining area,which has the Be-Li-Nb and Ta metallogenic series.To provide theoretical basis for futher prospecting in this area,this paper analyzed and studied the ore deposit geological characteristics,rare metal occurrence state and enrichment regularity,wall rock alteration characteristics and prospecting marks of the newly discovered X03 superlarge spodumene pegmatite deposit an NO.528 ninbium-tantalum pegmatite deposit.The main knowledge gained is:1?The spodumene type pegmatic vein of X03 and the niobium tantalum type pegmatic vein of NO.528 is located in IV and V-shaped pegmatite zone,the different types of pegmatite veins are strictly controlled in space by two mica granite.The X03 vein is controlled by the late tensional fractures of the vault,it is formed by the multi-stage(three stage)pulsating filling replacement and the ore body has poor zoning.The NO.528 is controlled by the same tectonics(right-handed torsional fracture),and the orebody is well distributed.2?The both X03 and NO.528 are granite of low potassium-calcium alkalis with high degree of differentiation.The rare earth content is low,with the average value of 12.43 and 5.74 respectively,and the distribution mode of rare earth is:light rare earth enrichment and the right model of heavy rare earth loss.The ?Eu of the X03 vein displayed as weak negative europium anomaly,The part of the rich Nb?Ta shows a weak positive europium anomaly in the NO.528 vein.The?Ce is most are weak-medium negative cerium anomaly in X03 vein and NO.528 vein.3?According to the analysis of the main mineral composition of X03 and NO.528 vein,Li is mainly found in spodumene,followed by zinnwaldite ?Li-phengite and muscovite,other minerals contain less;Nb and Ta are mainly concentrated in niobium tantalum minerals,then mainly found in cassiterite and muscovite.The main niobium tantalum minerals of X03 vein is mangancolumbite,the NO.528 is mainly manganotantalite.In addition,the content of Ta inmuscovite in the different structure belt of NO.528 has a tendency of increasing from outside ore body to inside,the Nb content is opposite to the Ta.Other rare elements are so less that can only be used as associated minerals for comprehensive utilization.4?The rare metals in different types of pegmatites in X03 are not showing the trend of increasing or decreasing with the time of generation,the whole is oscillating.From the perspective of ore body space,the contents of Li,W and Sn are relatively rich in the north part of the ore body along the toeards of the ore body.In contrast,The content of Nb,Ta and Rb is the opposite,and the content of Be and Cs is relatively homogeneous.Along the tendency of the ore body,there is an increasing tendency of Li in the north of the ore.In the direction of the thickness of the ore body,Li only has a middle height and a low trend on both sides at No.2 line.In NO.528,the contents of Nb and Ta were significantly increased from the outer zone of fine grained rock to inner pegmatite,and the contents of Nb and Ta in the lower plate of the ore body were mostly higher than that of the upper plate.The ore body is so poorer that just the inner part reaches to the industrial boundary grade.5?All the near vein surrounding rocksof X03 and NO.528 veins have the tourmaline belt and cordiolite belt,and the width of alteration belt and the mineral content of alteration are all related to the size,attitude and distance of the veins.Based on the analysis of rock chemical,it is suggested that the contents of Li?Rb?Cs?B?F of the surrounding rock are decreased with the increasing distance far away from the vein material,but there is a diffenent intensity between each halo zone,the Li halo is strongest,others are weaker.6?Through the study of the typical rare metal pegmatite deposit,the ore for ming geological features and the ore-hunting indicators were systematically su mmarized.Based on this,two rare metallogenic promising prospecting areas wer e identified,it contains the eastern and northeastern part of the periphery of jiaji ka mining area,and dezeke which is north of the periphery of jiajika. |
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