西秦岭造山带天子山埃达克岩地球化学特征及Cu-Au成矿  

Geochemistry of Adakitic Rocks and Cu- Au Mineralization in the Tianzishan Region,West Qinling Orogenic Belt

作　　者：黄邦毅 汪龙[1] 辛宇佳[1] 覃敢 

机构地区：[1]中南大学地球科学与信息物理学院,湖南长沙410083

出　　处：《南方金属》2015年第5期13-16,共4页Southern Metals

摘　　要：西秦岭造山带天子山埃达克岩地球化学特征及cu—Au成矿研究表明，天子山二长花岗岩的SiO：含量较高，为68.14％～69.92％，Na2O为4.29％～5.57％，天子山二长花岗岩具有强烈的亏损重稀土元素，极高含量的sr（579×10^-6～1120×10^-6）及Ba（2350×10^-6～2470×10^-6），极低含量的Y（7.86×10^-1～10.2×10^-6）及Yb（0.72×10^-6～0.98×10^-6），极高的sr／Y（64.10～132.32）和La／Yb（56.33～75．19）[1]，这与埃达克岩特征极其相似．天子山二长花岗岩断裂构造较为发育，含矿热液易在岩体中聚集，还能沿裂隙进入围岩形成矿化．目前外围已发现并勘查了中低温热液金矿6处，中型1处，小型1处，矿点4处[1]．因此天子山岩体是找铜金有利的岩体，具有极大的成矿潜力．The geochemical characteristics of Tianzi Mountain Adakite in orogenic beh of West Qin Valley and the study of mineralization of Cu - Au indicate that monzonitic granite in Tianzi Mountain has a high content of SiO2,68.14 ～ 69.92% specifically and contains 4. 29 ～ 5.57%NazO. The monzonitic granite has heavy rare earth elements in a large amount and contains a lot of Sr and Ba ： 579 × 10-6 ～ 1 120 × 10-6 and 2350 ～ 10-6 -2470 ～ 10-6 respectively; it contains little Y and Yb： 7. 86 ～ 10 -6 ～ 10. 2 ～ 10 -6 and 0. 72 ～ 10 -6 ～ 0. 98 × 10 -6 respectively, and as a result, the ratio between Sr and Y as well as La and Yb is high： 64. 10 ～ 132. 32 and 56. 33 -75.19 respectively, which resembles the characteristics of Adakite. The fault structure of Tianzi Mountain monzonitic granite is fairly developed and ore fluid can gather easily in rock mass and flow into surrounding rock and be mineralized there as well. Currently, 6 medium - low temperature ore fluid gold ore mines have been discovered and reconnoitered ： 1 medium ore, 1 small ore and 4 mineral occurrences. Therefore, Tian- zi Mountain rock mass is promising in finding Cu -Au and has remarkable potential in mineralization.

关 键 词：西秦岭造山带 花岗岩 埃达克质岩 大陆碰撞型花岗岩 

分 类 号：P59[天文地球—地球化学] P618.501[天文地球—地质学]