摘要
腾冲-梁河锡矿带砂锡矿床的形成,与燕山-喜山期含锡花岗岩及原生锡矿有关。其分布和产出受原生矿规模、第四纪地理环境、新构造运动及当时气候条件所制约。据成矿地质条件及砂锡矿床特征,划分出变花岗岩风化壳型、残-坡积型、冲一洪积型、湖积型等四种成因类型,指出成矿远景区,预测了远景规模;对山寨火山堰塞湖盆第四系,建立了地层层序,划分了沉积相。对区内砂锡矿成矿机理和成矿模式作了论述,并对砂锡矿的普查勘探方法进行了总结。指出重砂测量是有效的找矿方法,浅井探和SZ-130-A型砂钻是勘探砂矿的适用手段。对确定砂锡矿品位的不同测试方法作了对比,取得了一定效果。
The formation of tin placer in the Tengchong-Lianghe tin mineralized zone is related to the tinny granite and primary tin deposit of Yanshan-Hi-malayan periods. The distribution and occurrence of tin placer are controlled by the size of primary deposit, geographical setting of Quaternary, neotecto-nic movement and climatic condition at that time. According to the geological condition of metallization and the characteristics of tin placers, they are divi-ded into four genetic types: weathering crust of metagranites; elluvial-delu-vial; alluvial-proluvial and lacustrine. Minerogenetic prospect areas are pointed out. The scale of prospect is prognosticated. Quaternary stratigraphic sequence is set up in Quaternary of Shanzhai volcanics blocked lake basin. Sedimentary facies are divided. Metallogenic mechanism and model of tin placer are descri-bed. This paper also summarizes the methods of prospecting and exploration for tin placer. It is suggested that heavy sand measure is the effective method in searching the tin placer and that the shallow shaft and the Banka drill of SZ-130-Aare the suitable means for exploration of tin placer. The different testing methods for determing grade of the placer are compared and some results are achieved.
出处
《云南地质》
1991年第4期385-393,共9页
Yunnan Geology
