关键词: 赣西北, 花山洞钨矿, 花岗岩, 地球化学, 锆石定年

Abstract: Huashandong deposit is a newly found tungsten deposit in northwest Jiangxi Province, China. The exploration report shows that the granite is related to the forming of this deposit.This paper reports LAICPMS zircon UPb age, major and trace elements of the orerelated granite in the Huashandong tungsten deposit. LAICPMS zircon UPb dating yielded the crystallization age of (807±8) Ma for the granite. The granite is calcalkaline, peraluminous and rich in Na,characterized by the SiO2 content from 6823% to 7378%，Al2O3 content from 1441% to 1581%, Na2O+K2O content from 593% to 7%，K2O/Na2O content from 038 to 086，A/CNK＞11.ΣREE is low and there is enrichment of LREE.The fractionation between LREE and HREE is obvious. It is enriched in such LILE as Rb,Tu,U,La,Nd and depleted in HFSE such as Ba,Nb,Ti,Sr,P, with medium anomalies of Eu. In addition to the geological setting of Huanan plate in the Neoproterozoic, it shows that granite was formed in a continental marginal arc setting, and mainly originated from partial melting of crust.The age of Huashandong tungsten deposit is very close to the age of granite,showing that the mineralization is consistent with the differentiation evolution of granite,and the Huashandong tungsten deposit is the product of Jinningian magmatic activities.

Key words: Northwest Jiangxi, Huashandong tungsten deposit, granite, geochemistry, zircon UPb geochronology