大兴安岭成矿带成矿远景地球化学调查评价之设想与建议

Some opinions and proposals concerning geochemical survey and evaluation of the ore potential in the Da Hinggan Mountains metallogenic belt

大兴安岭成矿带自西向东,从干旱荒漠区、半干旱荒漠草原区,一直过渡至森林沼泽区,其中大部分属于区域化探扫面的问题地区,由于风成沙和有机质的影响,异常查证没有明显找矿效果。针对这一情况,笔者提出在大兴安岭成矿带开展1∶50万岩石地球化学测量的构想,并就其必要性和可行性进行了分析论证,同时还从采样方法、分析指标及成矿预测等技术环节,提出了一些个人的设想与建议。可以预期,大兴安岭成矿带1∶50万岩石测量,不仅能够实现对一个成矿带成矿远景的宏观评价,同时还将为1∶20万区域化探资料的重新认识、评估和利用建立起一个更加宽阔、更近真实的地球化学场。

The Da Hinggan Mountains metallogenic belt extends eastwards from arid desert area and the semi arid desert grassland area to the forest swamp areas and mostly belongs to the trouble areas in regional geochemical exploration. Due to the influence of the eolian sand and organic matter,anomaly verification fails to show obvious ore exploration effects. In view of such a situation,the authors put forward the opinion of carrying out 1∶ 500 000 geochemical survey in the Da Hinggan Mountains metallogenic belt,with the analysis and demonstration of the necessity and feasibility of this opinion. From such aspects as sampling method,analysis index and metallogenic prediction technology,the authors put forward some assumptions and suggestions. It can be expected that 1∶ 500 000 geochemical survey in the Da Hinggan Mountains metallogenic belt can not only realize the macroscopic evaluation of the metallogenic belt but also establish a wider geochemical field closer to the reality for the understanding,assessment and utilization of the 1∶ 200 000 regional geochemical exploration data.