若干深穿透地球化学方法在智利Spence隐伏斑岩铜矿床上的应用试验

THE EXPERIMANTAL APPLICATION OF SOME DEEP-PENETRATING GEOCHEMICAL METHODS OVER THE SPENCE CONCEALED PORPHYRY COPPER DEPOSIT IN CHILE

在智利Spence隐伏斑岩铜矿床进行的深穿透地球化学国际合作项目应用试验中,中国的活动态顺序提取和超滤技术及加拿大实验室的6种选择性提取方法在矿体上方均有较好的元素异常显示。为了辨别异常的类型,笔者对试验样品进行铜的工业矿物相提取和测试,发现氧化物相和硫化物相铜在矿体上方有更好的异常显示,确认上述元素异常应当是矿致异常。就Spence一类隐伏斑岩铜矿床而言,在发现铜异常的基础上,应该用痕量元素相态分离、测试技术,定量找寻铜元素的工业矿物异常,如果两种异常吻合,则将更有把握对隐伏的矿体(床)作出正确的评价。

In deep-penetrating geochemical international cooperative project, results obtained by sequential extraction methods for mobile forms with ultra filtration technology of China and six selective leach methods of Canadian labs showed fairly good anomaly over the Spence porphyry copper deposit in Chile. In order to identify the type of anomaly, the authors extracted and tested industrial mineral phase of Cu. The results show that Cu of oxide and sulfide phases has fairly ideal anomaly discrimination over the ore body. It can thus be confirmed that the above-mentioned anomaly is an ore-induced anomaly. The authors believe that, for underlying porphyry copper ore deposits such as Spence, trace phase analytical method technology should be used to look for industrial mineral anomaly after find- ing element anomaly by deep-penetrating geochemical methods. If the two kinds of anomalies coincide with each other, researchers can more confidently make a correct assessment of ther concealed ore body.