陕西省略阳县铧厂沟金矿床主矿带地球化学原生晕特征及其地质意义  

Primary Halo Research of the Main Ore Zone in the Huachanggou Gold Deposit in Lüeyang,Shaanxi Province

作　　者：刘冲昊[1] 刘家军[1] 贾磊[1] 王维钰 王立新[2] 于康伟 陈冬[3] 李志国[3] 王建平[1,4] 

机构地区：[1]地质过程与矿产资源国家重点实验室,中国地质大学地球科学与资源学院,北京100083 [2]陕西略阳铧厂沟金矿 [3]中国黄金集团公司 [4]桂林理工大学广西隐伏金属矿产勘查重点实验室

出　　处：《现代地质》2013年第1期1-12,共12页Geoscience

基　　金：国家自然科学重点基金项目(41030423);中国地质调查局地质调查工作项目(1212011220924);中国黄金集团公司及其他项目(武黄研WHY(05)-03);广西隐伏金属矿产勘查重点实验室开放课题(11-031-20-K6)

摘　　要：陕西省铧厂沟金矿是一个主要赋存于海底基性火山喷流细碧岩中的金矿床。在野外地质工作的基础上,对主矿带样品的测试数据进行了数学地质分析和原生晕分带序列计算。结果表明,Au11矿体的原生晕轴向分带序列从上至下为:Hg-Sb-Ni-As-Bi-Cu-Au-Co-Zn-W-Mo-Mn-Pb-Ag-Cd;Au8矿体的原生晕轴向分带序列从上至下为:Cu-Co-W-Au-Ni-Sb-Mn-As-Pb-Bi-Hg-Mo-Ag-Zn-Cd;并提出了主矿带理想原生晕分带序列:Sb-As-Cu-Hg(前缘晕)→Au-Ag-Bi-Pb-W(近矿晕)→Ni-Co-Mn-Mo-Zn-Cd(尾晕)。结合微量元素衬值空间变化规律,建立了2个矿体的原生晕叠加理想模型。Au11矿体在1 150 m中段以前缘晕和尾晕叠加为特征;在1 110 m中段,发育较强的尾晕。Au8矿体在1 150 m和1 070 m中段以前缘晕和尾晕叠加为特征;在1 110 m中段,矿体减薄,近矿晕减弱,发育很弱的前缘晕和尾晕。综合分析认为,Au11矿体到达中下部,向深部仍有一定延伸;Au8矿体已经接近尾部,深部可能存在新的矿体。On the basis of field geological work, the paper analyzes the microelements of the samples of the main ore zone, with the methods of geo-mathematic analysis and the calculation of the primary halo zoning. The result shows that the primary halo axial zoning sequence of ore body Aul I is Hg-Sb-Ni-As-Bi-Cu-Au-Co-Zn-W- Mo-Mn-Pb-Ag-Cd, and the primary halo axial zoning sequence of ore body Au8 is Cu-Co-W-Au-Ni-Sb-Mn-As- Pb-Bi-Hg-Mo-Ag-Zn-Cd. The ideal primary halo axial zoning sequence of the main ore zone is brought forward, which is Sb-As-Cu-Hg（ front halo elements）→Au-Ag-Bi-Pb-W（ near-ore hole elements）→Ni-Co-Mn-Mo-Zn-Cd （rear halo elements）. According to the characteristics of contrast halo zoning of the two ore bodies, the idealzoning models of the primary superimposed halos are built. In ore body Aul I, the front halo is coexistent with the rear halo in 1,150 m middle section, and the rear halo appears obviously in 1,110 m middle section. In ore body Au8, the front halo is coexistent with the rear halo in 1 , 150 m and 1,070 In middle sections; the near-ore halo is decreased in !, 110 m middle section with ore body thinning and the weakening of the front and the rear halos. According to the results mentioned above, ore body Aul 1 is extending to the deep part; the underlying part of ore body Au8 is not deep, but there is a new ore body in deep part.

关 键 词：原生晕 数学地质分析 理想模型 铧厂沟金矿 陕西 

分 类 号：P618.51[天文地球—矿床学] P632.2[天文地球—地质学]