喀拉通克与金川铜镍硫化物矿床地质地球化学特征对比及其意义  

A comparison of geology geochemical characteristics between the Kalatongke and the Jinchuan Cu-Ni sulfide deposit and its significance

作　　者：代俊峰[1] 宫磊[1] 樊立飞 王勇[1] 赵斌斌[1] 

机构地区：[1]兰州大学地质科学与矿产资源学院,兰州730000

出　　处：《中国工程科学》2015年第2期85-96,共12页Strategic Study of CAE

基　　金：中国工程院咨询项目(2013-04-XY-001)

摘　　要：对喀拉通克和金川铜镍硫化物矿床的主、微量元素的含量及其地球化学特征进行分析对比,结合构造环境和岩石系列对岩浆作用和成矿作用进行了研究。喀拉通克岩体的主量元素特征属于拉斑玄武岩系列;富集大离子亲石元素,亏损高场强元素,显示出大陆地壳的特征;稀土元素表现为轻稀土富集,Sr、Nd同位素值指示岩浆源区为亏损的软流圈地幔。金川岩体的主量元素特征属于拉斑玄武岩和大洋中脊玄武岩(MORB)的岩石系列;富集大离子亲石元素,亏损高场强元素,显示地壳物质混染或者源区洋壳俯冲物质的残留;稀土元素表现为轻稀土富集;Sr、Nd同位素值指示岩浆源于富集地幔。运用三维地质建模的手段,对矿床的岩浆通道和深部边部成矿潜力进行了预测,以期对后期的找矿有所帮助。According to the analysis and comparison with the content and geochemical char- acteristics of major and trace element from Cu-Ni sulfide deposits between Kelatongke and Jin- chuan, meanwhile, combing different tectonic setting and rock series of these two types of de- posits, we study their magmatic and mineralization processes. The results show that major ele- ment of Kalatongke belongs to the tholeiitic basalt system; incompatible trace element presents as enrichment of large ion lithophile elemen（LILE） and depletion of high field strength element （HFSE）, suggesting that they are derived from the continental crust; the rare earth element （REE） presenting rich in light rare earth element （LREE）, and there is no obvious Eu anoma- lies, Sr and Nd isotopes indicates that the magma source is depleted asthenosphere mantle. Ma- jor element of Jinchuan deposit belongs to the tholeiitic basalts and mid ocean ridge basalt （MORB） system; incompatible trace element presents as enrichment of LILE, depletion of HFSE, showing the magma suffers from contamination of crust materials or there are materials of subducted oceanic crust in the source ; the ratio of N（La）/N（Nb） and N（Zr）/N（Nb） indicating its source is derived from EMI mantle; the REE presenting enriched in LREE, the ratio of N（La）/N（Yb）, N（La）/N（Sm） and N（Gd）/N（Yb） presenting enriched in LREE; and there is no ob- vious Eu anomalies, Sr and Nd isotopes declaring magma derived from enriched mantle. And we also predicted the magma conduit and mineralization potential of these two ore deposits by 3D geological modeling, booed it will useful for later period exploration.

关 键 词：岩浆铜镍硫化物矿床 岩浆源区 地壳混染 微量元素 岩石系列 三维地质建模 喀拉通克 金川 

分 类 号：P611.11[天文地球—矿床学]