多元素衬值累加地球化学方法在找矿中的应用——以青海省夏日哈-什多龙远景区为例

青海省夏日哈-什多龙成矿远景区位于青藏高原东昆仑东段,西起都兰县夏日哈镇,东至兴海县什多龙一带,跨祁漫塔格北坡-夏日哈岩浆弧和北昆仑岩浆弧,是青海省重要的成矿区。为了在该区寻找新的成矿有利地段,本文在对该区区域地质背景、矿产特征及区内典型矿床地质特征系统研究的基础上,利用多元素衬值累加地球化学找矿方法,在区域上优选出一批找矿靶区。多元素衬值累加地球化学找矿方法首先收集远景区1∶5万水系沉积物测量成果,经过数据处理,绘制远景区衬值累计地球化学图,进而建立典型矿床找矿模式,最终通过对比分析,选出新的找矿靶区。对圈定的找矿靶区进行野外踏勘检查,均发现不同程度的矿化线索,为今后在该区进一步找矿起到了很好的指导作用。通过本次工作,发现了该方法在靶区圈定方面的优势:(1)可快速圈定异常,提高工作效率;(2)编制的地球化学图浓集中心更显著;(3)圈定的找矿靶区找矿成果显著,尤其针对陆相火山岩型多金属矿、斑岩型铜钼矿、矽卡岩型多金属矿找矿成果突出;(4)能直观反映背景变化趋势,有助于评价异常。

Application of the geochemical method based on multi-element constract-value accumulation to ore prospecting: An example of the Xiariha-Shiduolong metallogenic prospect area of Qinghai Province

This paper discussed the Qinghai province Xiariha-Shiduolong mineral resources prospecting area located in the Tibetan Plateau east of Eastern Kunlun, west of Dulan town in Xiariha County, east of Xinghai County Shiduolong area.The northern Kunlun magmatic arc and the northern magmatic arc in the northern slope of the Qilian mountains.This paper takes Xiariha-Shiduolong resources prospecting area as an example, based on the research of the system of the regional geological background, mineral features and typical ore deposit geological characteristics, using multi element contrast accumulative geochemical prospecting method, select the new prospecting targets in the region. Multi element contrast accumulative geochemical prospecting method first collects the prospect area 1:5 000 stream sediment survey results, after data processing, the cumulative value of prospecting area lining compiling geochemical map, and then establish the typical ore deposit prospecting model, finally through the comparative analysis, select a new prospecting target area. Through this work we also found some advantages of this method in the delineation of the can quickly locate the abnormal work efficiency; the center concentration map of earth chemistry method developed is more obvious; the ore target area for the prospecting method to delineate results significantly, especially for the continental volcano rock type polymetallic deposit, the porphyry copper molybdenum deposit, skarn polymetallic ore prospecting results of the ideal; the method can reflect the background change trend of intuitive, help us to evaluate abnormal.