以江西省武宁县石门寺钨铜矿区燕山期和晋宁期岩体风化作用过程中W、Cu等元素的表生地球化学行为为研究对象，通过反映风化程度的化学风化指数CIA、风化作用过程中组分得失的估算、不同介质中W、Cu等成矿元素的含量变化及大离子亲石元素表生地球化学行为等方法的研究表明，石门寺钨铜矿区2个时期岩体元素淋失与风化强度有关，土壤剖面中碱金属、碱土金属元素大量淋失，而W、Cu等成矿元素在土壤B层中显著富集；从岩石到土壤、再到水系沉积物风化过程中，W、Cu等成矿元素含量逐渐升高，为此，一级水系沉积物和B层土壤是赣北九岭W、Sn、Cu、Mo多金属矿集区地球化学找矿的绝佳采样介质，是矿集区内找矿新突破的有效手段。%Taking the supergene geochemical behavior of such elements as Cu and W in Yanshan period and Jinning period of rocks during the process of weathering as the study object, the authors conducted the investigation, and the results can offer an effective geochemical basis for the development of regional geochemical prospecting and the establishment of geological-geochemical pros-pecting model for the magmatic hydrothermal type tungsten-copper deposit. Through the study of CIA that reflects the weathering degree, the estimation of components of gain and loss in the process of weathering, the content changes of such ore-forming ele-ments as tungsten and copper in different media, and the supergene geochemical behavior of the large ion lithophile elements, the au-thors have reached some conclusions:The elements leaching of the two periods of rocks is related to the intensity of the weathering in the Shimensi tungsten-copper mining area. The alkali metals and the alkali-earth metal elements have been subjected to consider-able leaching in the soil profile whereas W, Cu and some other ore-forming elements are significantly concentrated in soil horizon B. W, Cu and some other ore-forming elements gradually increase in the process of weathering from rock to soil and then to the stream sediments. Therefore, excellent sampling media seem to be the first-order stream sediments and soil horizon B for geochemical pros-pecting in the Jiuling W, Sn, Cu and Mo polymetallic ore concentration area in northern Jiangxi Province. These effective prospect-ing means can make a new breakthrough in the ore concentration area.
展开▼
