On the basis of 1:50 000 stream sediment-10-+60 mesh survey in Alpine Lake Hill Landscape of Xainza City, Tibet, this paper discussed the characteristics of stream sediment element content and combinations, element background values in ophiolite zone, element anomalies and their prospecting significance in ophiolite and sedimentary zone. The results show that, in the sedimentary zone, most elements are significantly enriched,except for such elements as Cr, Co, Ni and Hg. The characteristics of element combinations better reflect mineralization. On the contrary, in the ophiolite zone, the elements of Cr, Co and Ni show very high relationship, but the element combinations fail to reflect good mineralization;as for the elements of Au, Co, Cu, F, Zn, the positive anomalies are not obvi-ous in the ophiolite zone. In this study, one class A anomaly and eleven class B anomalies were delineated, and two new gold minerali-zation spots were discovered. The anomalies are good indications of geological structures and mineral resources. Under the similar condi-tions of geological landscape, this method is obviously significant in revealing element geochemical characteristics and guiding prospec-ting.%在西藏申扎高寒湖泊丘陵景观区,通过粒级为-10~+60目的1:5万水系沉积物测量,探讨该区水系沉积物中元素含量分布、元素组合特征、蛇绿岩区元素背景值,以及蛇绿岩和沉积岩区元素异常特征与找矿意义. 结果表明:沉积岩区除Cr、Co、Ni、Hg外,多数元素富集显著,元素组合能较好地反映矿化特征;蛇绿岩区Cr、Co、Ni与岩体高度相关,但Au、Co、Cu、F、Zn正异常不显著,元素组合对矿化特征反映不好. 在研究区圈定了甲类异常1个,乙类异常11个,新发现金矿(化)点两个,异常对地质构造及矿产有较好的指示作用. 在类似地质景观条件下,该方法对揭示元素地球化学成矿作用及指导找矿意义凸显.
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