北秦岭花石山地区金成矿规律及成矿预测

Metallogenic regularity and prognosis of gold deposits in Huashi Mountain area,North Qinling

研究区位于北秦岭加里东褶皱带北部,属花庙-利桥金成矿区。区内出露地层主要为奥陶系草滩沟群,以海相沉积及中酸性火山岩为主的中等变质绿片岩系分布较广,含金背景值高,是区内金矿富集的重要物源基础。加里东至华力西期均有岩浆侵入活动,花石山金矿产于华力西早期党川二长花岗岩和熊山沟似斑状正长花岗岩体之间。区域断层构造发育,矿区分布于南部近EW向黄家坪韧性剪切带与北部近EW向党川脆性断层之间地带;区内次级NW向至近SE向脆性断层也十分发育,控制了该区金矿体的产出形态及规模。通过研究对比,总结了区内金矿成矿要素,建立了成矿模式图。在花石山金矿床研究分析的基础上,编制了研究区金矿预测要素表,建立了预测模型。

The study area is located in the northern Caledonian fold belt,North Qin Mountains,and belongs to the huamiao-liqiao Sung Kim mining area.The main outcrops in this area are Ordovician caotangou group,and the middle metamorphic greenschist series,mainly composed of marine sediments and intermediate-acid volcanic rocks,are widely distributed and have high gold-bearing background values,which are the important source basis for gold enrichment in this area.The Huashishan gold deposit occurs between the early danchuan monzonite granite and the Xiongshangou porphyry syenite granite.The regional fault structures are well developed,and the mining area is distributed between the huangjiaping ductile shear zone near EW in the south and the Dangchuan Brittle Fault near EW in the north,the occurrence form and scale of gold orebody in this area are controlled.Based on the study and comparison,the metallogenic factors of gold deposits in the area are summarized,and the metallogenic model map of gold deposits is established.On the basis of the study and analysis of Huashishan gold deposit,a table of gold deposit prediction factors and a prediction model are established.