中国地质2013，Vol.40Issue(4)：1030-1043,14.
西准噶尔包古图富镁闪长质岩墙的时代、地球化学特征以及铜金成矿意义
Age, geochemical features and Cu-Au mineralization significance of the magnesian dioritic dykes in Baogutu area of west Junggar
摘要
Abstract
The magnesian dioritic dykes widely distributed in west Junggar of Xinjiang recorded the Late Paleozoic tectonic evolutionary history of the area.The LA-ICP-MS zircon U-Pb and amphibole Ar-Ar dating of dioritic dykes yielded a 206Pb/238Uage of 316.3±3.8 Ma and a plateau age of 313.1±3.5 Ma,respectively,suggesting that they were generated in Late Carboniferous.The magnesian dioritic dikes (56.8％-62.9％) are characterized by high MgO (2.39％-4.04％; Mg#=54-62),Cr (30×10-6-80 ×10-6),and Ni (20×10-6-62×10-6) content.These samples show negligible to negative Eu values,high Sr/Y (36-44) ratios,strong depletion of HREE (e.g.,Yb =1.32×10-6-1.54×10-6 and Y=13.1 ×10-6-15.5×10-6),and enrichment oflarge-ion-lithophile elements (LILE) (K,St,Ba) with negative Nb-Ta-Ti anomalies.These features are compatible with slab-derived adakites interacted with mantle materials and related to ridge subduction.The interaction between high oxygen fugacity slab melt and mantle peridotite caused the decomposition of metal sulfides and the Cu and Au mineralization.Baogutu area of west Junggar thus has good metallogenic prospect.关键词
包古图/富镁闪长岩/岩墙/锆石U-Pb/角闪石Ar-Ar/铜金矿化/LA-ICP-MSKey words
Baogutu/ magnesian diorite/ dyke/ zircon U-Pb/ amphibole Ar-Ar/ copper-gold mineralization, LA-ICP-MS分类
天文与地球科学引用本文复制引用
尹继元,陈文,喻顺,龙晓平,袁超,张彦,李洁,孙敬博,刘新宇..西准噶尔包古图富镁闪长质岩墙的时代、地球化学特征以及铜金成矿意义[J].中国地质,2013,40(4):1030-1043,14.基金项目
国家自然科学基金(41203026,41273012),中国地质科学院地质研究所基本科研业务费项目(J1209),公益性行业专项经费(201211074-05)和中国地质调查局地质矿产调查评价专项(12120113015600)联合资助. （41203026,41273012）
