甲玛与世界级铜矿的初步对比及下一步找矿工作建议

A preliminary comparison between Jiama and worldclass copper deposits and an analysis of the prospecting potential

西藏甲玛铜多金属矿床随着勘探工作的深入取得重大成果,已成为冈底斯斑岩铜矿带内最重要的大型矿床之一。通过对世界级铜矿含义的解析,与北美、南美、环太平洋西南部及其他主要产区的世界级铜矿进行对比,认为甲玛铜多金属矿床以矽卡岩型、斑岩型和角岩型三位一体、形成于晚第三纪青藏高原隆升阶段为显著特点,具有成为世界级铜、金、银、钼多金属矿床的潜力。在下一步的勘查过程中,需要进一步加强对矽卡岩型铜矿石成矿机制的研究和勘探,加强隐伏岩体含矿性的研究与评价,加强铜、金、银、钼多种金属物质大规模聚集的成矿机制的研究,并需要打破"热液矿床大不了"的潜意识,建立起新的资源评价体系。

The Jiama copper polymetallic deposit in Tibet has expanded its resources successfully through recent exploration and thus become one of the most significant large-size porphyry copper deposits in Gangdese.Based on an analysis of the definition of worldclass copper deposit and a comparison with worldclass copper deposits in North America,South America,southwest Circum-Pacific region and other areas,the authors hold that the Jiama copper polymetallic deposit has the potential of a worldclass copper,gold,silver,molybdenum polymetallic deposit in that it is characterized by three ore types（skarn,porphyry and hornfels）in one deposit which were formed at the uplifting stage of Qinghai-Tibet Plateau in Late Tertiary.In the future exploration,three aspects are worthy of especial attention：research and exploration of metallogenic mechanism of the skarn type copper ore;research and assessment of ore-bearing potential of buried rock bodies;research on metallogenic mechanism of large-scale concentration of copper,gold,silver,molybdenum and other metals.The subconscious of ＂no large-size hydrothermal ore deposit is existent＂ must be broken and a new assessment system for mineral resources should be estabished.