Geochemical characteristics of stream sediments and prediction of mining prospects in the Wulandaban—Zhazigou area, Danghe South Mountain, Gansu Province
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摘要:
党河南山位于南祁连地块北缘，以党河断裂为界，北邻中祁连，属南祁连Au、Pb、Zn、Cu、Ni、W、Cr成矿带。金矿为该成矿带的主要矿种，素有72道金沟之称，目前已发现贾公台、黑刺沟等大中型金矿床2处，小型金矿床及金矿点10余处。乌兰达坂沟—扎子沟地区位于党河南山中段，小比例尺化探显示金异常强烈，且区内可见大量的砂金采矿点及民采坑硐，显示了该地区良好的找矿地质条件。本文是在对区内开展调查研究基础上，利用1:5万水系沉积物测量，对区内地球化学特征、元素分布特征、元素相关性及异常元素组合特征等进行相关分析研究，并结合异常区内地层、构造、岩浆岩及矿化蚀变特征等成矿地质条件，圈定成矿远景区。通过本次工作在该地区圈出11处金的成矿远景区，并对其进行了分类排序。一类成矿远景区有扎子沟南、钓鱼沟脑、钓鱼沟、红庙沟、背架子—乌兰达坂沟成矿远景区，对一类成矿远景区内地质成矿条件进行了概略论述，并对其下一步工作提出了建议。成矿远景区的圈定为该地区下一步继续找矿工作提供了重要的参考。
Abstract:Danghe South Mountain is located at the northern edge of South Qilian massif, bounded by the Danghe River, and neighbors the central Qilian massif in the north. It belongs to the South Qilian Au, Pb, Zn, Cu, Ni, W, and Cr metallogenic belt. The gold deposit is the main mineral species in the metallogenic belt. It is known as 72 gold ditches. At present, two large or medium-sized gold deposits have been discovered, and there are more than ten small gold ore spots. Wulandaban-Zhazigou area is located in the middle of the Danghe South Mountain. A large number of gulch-gold mining sites can be seen in the area, showing good geological conditions for prospecting in this area. Based on the investigation and study of the area, the authors analyzed the geochemical characteristics, elemental distribution characteristics, elemental correlation and abnormal elemental combination characteristics in the study area by using 1:50, 000 stream sediment survey. Combined with the geological conditions such as strata, structures, magmatic rocks and mineralization alteration characteristics in the area, the authors delineated the metallogenic prospective areas. Through this work, 11 metallogenic prospective areas of gold were delineated which could be divided into three types. The first type includes the south of Zhazigou, Diaoyugounao, Diaoyugou, Hongmiaogou and Beijiazi-Wulandabangou metallogenic prospective areas. The authors also discussed the minerogenetic condition and put forward some suggestions concerning further work in the first type metallogenic prospective areas. Delineation of the metallogenic prospective areas provides important reference for further prospecting work.
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表 1 甘肃党河南山乌兰达坂沟—扎子沟地区各元素水系沉积物异常下限值
Table 1. The abnormal limits of different elements in stream sediments of Wulandabangou—Zhazigou area, Danghe South Mountain, Gansu Province
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表 2 甘肃党河南山乌兰达坂沟—扎子沟地区各地质单元水系沉积物元素含量平均值
Table 2. The average element content of different strata in Wulandabangou—Zhazigou area, Danghe South Mountain, Gansu Province
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表 3 甘肃党河南山乌兰达坂沟—扎子沟地区不同地质单元中相对富集元素组合
Table 3. The enriched elements in different geological units in Wulandabangou—Zhazigou area, Danghe South Mountain, Gansu Province
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表 4 甘肃党河南山乌兰达坂沟—扎子沟地区HS-1化探综合异常特征
Table 4. The characteristics of synthetic geochemical anomaly of HS-1 in Wulandabangou—Zhazigou area, Danghe South Mountain, Gansu Province
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表 5 甘肃党河南山乌兰达坂沟—扎子沟地区HS-2化探综合异常特征
Table 5. The characteristics of synthetic geochemical anomaly of HS-2 in Wulandabangou—Zhazigou area, Danghe South Mountain, Gansu Province
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表 6 甘肃党河南山乌兰达坂沟—扎子沟地区HS-10化探综合异常特征
Table 6. The characteristics of synthetic geochemical anomaly of HS-10 in Wulandabangou—Zhazigou area, Danghe South Mountain, Gansu Province
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