陕西曹坪—九间房一带1:5万水系沉积物异常评价

Anomaly Evaluation of 1:50 000 Stream Sediment Survey in Caoping-Jiujianfang Area,Shaanxi Province

曹坪地区1∶5万水系沉积物测量圈定综合化探异常4个,分别是杨家院异常(Hz1)、龙头山异常(Hz2)、曹坪异常(Hz3)和三官洞异常(Hz4),其中3个异常位于曹坪岩体周边,1个异常位于岩体内部。通过对曹坪异常(Hz3)和三官洞异常(Hz4)的含金性进行评价,重新圈定Au异常5个,其中西部4个Au异常与线马沟、羊乃沟及王家沟矿化富集区套合较好,基本确定异常是由多个构造破碎带及矿脉的地表扩散所致,而东部的Au5异常强度较弱,但在其上方新发现金矿化脉体1条。Hz3和Hz4的前缘元素Sb与近矿元素Au整体呈NW向展布,与地层展布方向一致,尾晕元素Mo呈NE向展布。NW和NE向异常交会于王家沟矿化富集区,因此,推测王家沟矿化富集区深部找矿潜力巨大。

Four comprehensive geochemical anomalies have been delimitated by analyzing 1：50 000 stream sediment in Caoping area, those are Yangjiayuan anomaly（Hzl ）, Longtoushan anomaly（Hz2 ）, Caoping anomaly （Hz3） and Sanguandong anomaly （Hz4）.Among them,three anomalies are located at the surrounding area of Caoping intrusion,while one is in the intrusion.We focuses on the evaluation of gold capacity of Caoping and Sanguandong anomalies, and redelineate five gold anomalies.Four western gold anomalies are compatible with Xianmagou, Yangnaigou and Wangjiagou mineralization zones,which indicates the anomalies are caused by multiple tectonic fracture zones and ore veins.The anomaly intensity of eastern Au5 is weak, but above it there is a newly discovered gold mineralization vein.The front halo element（Sb） and near-ore element（An） of Hz3 and Hz4 anomalies spread NW trending,and they are in line with the strata distribution.The last halo element （Mo） is NE trending.The NE and NW trending anomalies intersect at Wangjiagou mineralization zone.Therefore,it is implied that the deep prospecting potential in Wangjiagou region is larger.