贵州贝达锑矿地质特征与找矿预测

Geological characteristics and prospecting prediction of Beida antimony deposit,Guizhou

贝达锑矿成矿条件优越,岩石地球化学异常表明该区有两个规模较大的Sb、Hg、As组合异常,Ⅱ号异常推测为深部隐伏矿(化)体的前缘晕异常。可控源音频大地电磁测深表明在L128-L132线105-115点深部有一陡倾斜圈闭高阻异常体,异常中心部位为L130线110测点,推测该异常体为硅化蚀变体,异常形态与半坡外围找矿突破区的物探异常形态相似。在下一步找矿中,可重点对Ⅱ号岩石地球化学异常和物探异常中心部位开展风险钻探找矿工作,探讨深部成矿可能。

There is favorable metallogenic condition in Beida antimony deposit area, the rock geochemical anomalies in the Beida district showed that there are 2 large composite anomalies of Sb, Hg and As elements. The No. Ⅱ rock geochemical anomaly is interpreted to be the frontal halo anomaly of the deep concealed orebody. The interpretation of geophysical controllable source audio frequen- cy magnetotelluric sounding indicated that there is a steeply inclined trap high-resistivity anomaly at the depth of survey station No. 105 -115 along survey profile of No. L128-L132, and the center of the anomalous plane is at the depth of the survey station 110 along Line No.L130.It is inferred that the geophysical anomaly was resulted from alteration silicificated body. The abnormal shape of the controlla- ble source audio frequency magnetotelluric sounding is similar to the geophysical anomaly in the external prospecting area of Banpo. It is suggested that and the next stage prospecting work should foucs on the geochemical anomaly of No.Ⅱ complex rock mass and the cen- tral part of the geophysical anomaly.