南岭科学钻探(NLSD-1)矿化规律与深部找矿方向
Ore-forming regularity and deep prospecting direction of Nanling Scientific Drilling-1(NLSD-1)
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摘要: 南岭科学钻探（NLSD-1）是目前中国在华南金属矿集区内实施的最深钻探工程，总进尺2967.83 m，揭露金银铜铅锌和钨铋铀各类矿化120余处，矿化层可分为破碎带型、硅质脉型、长英质脉型，以微细脉、细脉、网脉状、浸染状、块状形式产出，其中达到工业品位的矿脉具有3段，多处矿化可侧向追索，具有潜力工业矿体。元素垂向矿化规律上表现为金银铜、铅锌矿化分别以组合形式出现，铋的元素异常与亲硫元素矿化具有明显相关性，其中贵金属矿化异常集中在推覆体内，而钨锡铀矿化向深部有增强趋势，两者在钻孔内具有较明显的岩性地层、构造和岩浆岩的专属性特征。根据NLSD-1揭露的垂向矿化规律，结合区域成矿规律研究成果提出四大找矿方向，即：推覆体内V10~V31向东向深部延展、推覆体下部钨铋多金属矿化、深部3个空间位置可能出现的厚大矿体以及外围高山角-井笔山一带斑岩型-爆破角砾岩型矿化。Abstract: Nanling Scientific Drilling-1(NLSD-1) is the deepest drilling engineering in South China ore concentration. The total drilling depth is 2967.83 m. 120 gold, silver, lead and zinc, bismuth, tungsten and uranium mineralization spots were exposed. Mineralization can be divided into fracture zone, siliceous vein type, quartz-feldspar vein type, which are produced in such forms as tracing detected very favorable industrial orebody potential. Vertical element mineralization regularity exhibits gold-silver-copper combination and lead-zinc combination. Bismuth anomaly is correlated significantly with the thiophile element mineralization. Precious metal mineralization anomalies are concentrated in nappe, whereas tungsten, tin and uranium mineralization tends to increase toward the depth, with both having specialization in lithological strata, tectonics and magmatic rocks in the borehole. According to uncovered information of vertical mineralization regularity revealed by NLSD-1 in combination with regional metallogenic regularity, the authors propose four prospecting directions:(1)V10-V31 in the nappe that extends to the east and to the depth; (2)Tungsten-tin polymetallic mineralization under the nappe; (3)Three deep spatial positions where thick orebodies may occur; (4)Porphyry-explosion breccia type mineralization in the periphery of Gaoshanjiao Hill-Bijia Hill.
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Key words:
- Scientific Drilling /
- Nanling /
- ore-forming regularity /
- mineralization zoning /
- deep prospecting
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