内蒙古维拉斯托矿区锂多金属矿床地质特征及找矿意义
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摘要
继内蒙古地质勘查有限责任公司在内蒙古克什克腾旗维拉斯托矿区发现并勘探大型锡多金属矿床后,2017年又在该矿区隐爆角砾岩筒中发现特大型云英岩型锂多金属矿床。该隐爆角砾岩筒总体呈上细下粗的柱体,延长247 m,延深640 m,垂高480 m,北西向倾斜,向南南向侧伏,侧伏角约76°。横截面为长轴走向近30°的椭圆形,直径140～300 m。隐爆角砾岩筒边缘发育震裂裂隙带,内部发育震碎角砾岩带和爆破角砾岩带,其中震碎和爆破角砾岩带全岩矿化,成矿元素锂、铷为主,伴生铌钽、铍、铯、锡、钨、钼、铜、锌等多种有益组分。岩筒内云英岩化、天河石化、萤石矿化强烈,锂云母分布普遍,Li_2O品位在0. 8%～3. 6%之间,平均品位1. 25%,Rb_2O品位在0. 1%～0. 58%之间,平均品位0. 35%。维拉斯托锂多金属矿床是内蒙古首次发现特大型云英岩型锂矿床,初步估算Li_2O金属量超过60万t。这一找矿突破对大兴安岭地区寻找锂矿床具有重要的指导意义。
Following the large Sn-W-Zn polymetallic deposits discovered by Inner Mongolia Geological Prospecting Co.,Ltd. in the Weilashituo area of the Keshiketeng,Inner Mongolia,in 2017,an extra large greisen-type Li polymetallic deposit was discovered in the crypto explosive breccia cylinder of the mine. The crypto explosive breccia cylinder is thin in the upper part and thick in the lower part. The length of the crypto explosive breccia cylinder is 247 m,the extension depth is 640 m and the vertical height of is 480 m.This cylinder plunge southward as 76°. it is elliptical in the cross-section,as long axis direction is nearly 30 °,and the diameter is140-300 m. The edge of crypto explosive breccia cylinder is the fracture fissure belt,the internal is crushed breccia belt and blasting breccia belt. The crushed and blasting breccia belt contained mineralized with Li and Rb as the major elements accompaning Nb,Ta,Be,Cs,Sn,W,Mo,Cu,Zn,Ca F et al as other beneficial components. The crypto explosive breccia cylinder has strong greisen,amazonitization and fluorite mineralization,and which has a lot of lithium mica. The Li_2O grade ranges from 0.8% to 3.6% and the average grade is 1.25%; The Rb_2O grade ranges from 0.1% to 0.58% and the average grade is 0.35%. The Weilasituo Li polymetallic deposit of Li_2 O metal content is over 600,000 tons preliminarily,which is the first discovery of extra-large greisen-type lithium deposit in Inner Mongolia. This prospecting breakthrough has a great guiding significance for exploration of lithium deposits in Da Hinggan Mountains.
Following the large Sn-W-Zn polymetallic deposits discovered by Inner Mongolia Geological Prospecting Co.,Ltd. in the Weilashituo area of the Keshiketeng,Inner Mongolia,in 2017,an extra large greisen-type Li polymetallic deposit was discovered in the crypto explosive breccia cylinder of the mine. The crypto explosive breccia cylinder is thin in the upper part and thick in the lower part. The length of the crypto explosive breccia cylinder is 247 m,the extension depth is 640 m and the vertical height of is 480 m.This cylinder plunge southward as 76°. it is elliptical in the cross-section,as long axis direction is nearly 30 °,and the diameter is140-300 m. The edge of crypto explosive breccia cylinder is the fracture fissure belt,the internal is crushed breccia belt and blasting breccia belt. The crushed and blasting breccia belt contained mineralized with Li and Rb as the major elements accompaning Nb,Ta,Be,Cs,Sn,W,Mo,Cu,Zn,Ca F et al as other beneficial components. The crypto explosive breccia cylinder has strong greisen,amazonitization and fluorite mineralization,and which has a lot of lithium mica. The Li_2O grade ranges from 0.8% to 3.6% and the average grade is 1.25%; The Rb_2O grade ranges from 0.1% to 0.58% and the average grade is 0.35%. The Weilasituo Li polymetallic deposit of Li_2 O metal content is over 600,000 tons preliminarily,which is the first discovery of extra-large greisen-type lithium deposit in Inner Mongolia. This prospecting breakthrough has a great guiding significance for exploration of lithium deposits in Da Hinggan Mountains.
引文
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王京彬,王玉往,王莉娟.2005.大兴安岭南段锡多金属成矿系列[J].地质与勘探,6(5):15-20.
翟德高,刘家军,李俊明,张梅,李泊洋,付旭,等.2016.内蒙古维拉斯托斑岩型锡矿床成岩、成矿时代及其地质意义[J].矿床地质,35(5):1011-1022.
郑翻身,蔡红军,张振法.2006.内蒙古拜仁达坝维拉斯托超大型银铅锌矿的发现及找矿意义[J].物探与化探,30(1):13-20,25.
祝新友,张志辉,付旭,等.2016.内蒙赤峰维拉斯托大型锡多金属矿的地质地球化学特征[J].中国地质,43(1):188-208.