青海东昆仑地区1∶2.5万地球化学测量方法技术及应用成果

Technique and Application Result of 1∶25 000 Geochemical Survey in EastKunlun,Qinghai Province

位于青海省东昆仑地区的干旱-半干旱高寒山区,水系沉积物异常流长偏短,1∶5万水系沉积物测量不能完全满足地质找矿的需要。青海省1∶2.5万地球化学测量以水系沉积物测量为主,土壤测量为辅,采用多点组合的采样方法,其对1∶5万水系沉积物测量综合异常具有较好的分解和重现性,并且新圈出地球化学综合异常。1∶2.5万地球化学测量综合异常浓集中心更加明显、强度更高,对异常源的定位更准。通过近年来在东昆仑地区开展1∶2.5万地球化学测量工作,发现了果洛龙洼大型金矿,按纳格、瓦勒尕中型金矿,浪木日铜镍矿点等一系列矿床点。因此,1∶2.5万地球化学测量工作方法在阿尔金、柴北缘等类似地球化学景观区得到推广应用。

In the arid and semi- arid alpine region of east Kunlun, Qinghai province, the abnor- mal flow length of stream sediments is short, 1 ： 50 000 stream sediment survey cannot satisfy the need of the geological prospecting. The 1 ＂ 25 000 geochemical survey in Qinghai Province is mainly based on the stream sediment survey and aided by soil surveying, and the multi - point combination sampling method has been used in this survey, which has good decomposition and re- producibility for the comprehensive anomalies of 1 ： 50 000 stream sediment survey, causing the more obvious, higher intensity concentration center for 1 ： 25 000 geochemical survey comprehensive anomalies and the more accurate location of abnormal source. In recent years, through the1 .＂ 25 000 geochemical survey work in east Kunlun, the Guoluolongwa large gold deposit, Annage and Walega middle gold deposit, Langmuri copper nickel occurrence have been founded. Therefore, 1 ： 25 000 geochemical survey methods can be applied in Aerjin, North Qaidam and other similar geochemical landscape area.