A Study of the Enrichment and Depletion Regularity of TraceElements in Porphyry Cu (Mo) Deposits
斑岩型Cu(Mo)矿床中微量元素富集贫化规律研究

According to the test data obtained from three porphyry Cu(Mo) deposits lying respectively in Chengmenshan of Jiangxi, Wunugetushan of Inner Mongolia and Baishantang of Gansu, the authors studied the enrichment and depletion regularity of trace elements in porphyry Cu(Mo) deposits. It is found that there exists not only the enrichment of some metallogenic elements but also the depletion of some lithophile-dispersed elements and rare elements in porphyry Cu(Mo) deposits, and that the characteristics of the depleted trace elements change from one deposit to another, showing their different particularities in porphyry Cu(Mo) deposits. These elements, however, also show some general characteristics. In porphyry Cu(Mo) deposits, some trace elements, such as Sr, are obviously depleted and their depletion degree gradually increases along with the intensification of Cu mineralization, which can serve as a discrimination criterion for the mineralization perspective of geochemical anomalies related to porphyries. The results of this study can provide the basis for realizing the indicator quantifi-cation in geochemical exploration.