Metallogenic series and exploration breakthroughs of Zhunuo ore district in Xizang
The eastern segment of the Gangdese giant copper polymetallic metallogenic belt,the largest in China,has achieved notable breakthroughs in the exploration of Cu-Mo polymetallic deposits.In contrast,the western seg-ment,largely covered by continental volcanic rocks,has been debated on its Cu polymetallic potential.Recently,significant support from the China Geological Survey and the Xizang Geology and Mineral Resources Bureau has led to the discovery and evaluation of several large and medium-sized deposits and prospects in this western seg-ment.Notable findings include the Zhunuo,Beimulang,Cimabanshuo,Dongshibu,Luobugangmu,Barela,and Tangge deposits,which may indicate the substantial copper polymetallic mineral potential of the region.The mine-ralization in this area is classified into several types:78 Ma skarn Mo-Pb-Zn deposit,48～65 Ma hydrothermal vein-type Mo-Pb-Zn deposit,and approximately 23 Ma,～16～17 Ma,and～13～14 Ma porphyry Cu-Mo deposit,along with approximately～21 Ma epithermal Au-Ag deposit.This series includes Late Cretaceous skarn-type Cu-Pb-Zn mineralization,Paleocene-Eocene hydrothermal vein-type Mo-Pb-Zn mineralization,and Miocene porphy-ry-epithermal Cu-Mo-Au-Ag mineralization.The porphyry Cu deposits exhibit a trend of progressively younger mineralization ages from southwest to northeast(Dongshibu→Cimabanshuo→Beimulang-Zhunuo),reflecting a multi-phase,multi-center mineralization pattern likely influenced by the northward migration of the deep subduct-ing Indian plate.Over 6 million tons of contained copper metal resources have already been identified in the Zhunuo mineral district,and there are more exploration targets in the areas such as Beimulang,Cimabanshuo and Dongshibu,where have great potential to yield further exploration breakthroughs.This demonstrates significant prospecting potential in the Zhunuo ore district,where may become another Cu-Mo(Au)resource base with about 10-million-tons contained metals in China.
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