摘要:
广西藤县大黎钼矿床位于钦杭成矿带西南端大瑶山金多金属成矿带上,矿体赋存于大黎岩体南端与寒武纪黄口洞组的内外接触带,受岩体接触带控制,平面上呈环形围绕岩体分布,其中外接触带黄铁绢英岩化地段为主要矿化部位。围岩蚀变以黄铁矿化、绢云母化为主,蚀变范围广,围绕岩体呈面状分布,不同蚀变间相互重叠。矿石以网脉状构造为主,其次为细脉状构造,浸染状构造较少见。矿化特征表明,该矿床成因类型属于斑岩型钼矿床。露头出现的辉钼矿和钼华、围绕斑岩体边缘分布的石英网脉、黄铁绢英岩化蚀变和Mo元素化探异常是重要的找矿指示标志。大瑶山地区花岗质斑岩体出露地区、Mo—Cu化探异常套合较好地区为有利成矿区。大黎岩体西南部接触带和东部地区成矿条件较为有利,可作为下一步找矿工作的重点区。
Abstract:
Dali molybdenum metallogenic belt of southwestern deposit of Tenxian, Guangxi province is located in Dayaoshan gold polymetallic Qingzhou-Hangcheng joint zone. The ore-bodies are occurred in inner contact zone between Cambrian Huangkoudong Formation and south part of Dali granite, and mainly found in beresitiza- tion zone which is around the Dali granite. The wall rock alteration is widely developed around the intrusion, and mainly are pyritization and sericitization. Ore are mainly stockwork structure, and some fine-vein structure, the disseminated structure is rare. Mineralization characteristics indicated that Dali deposit is belongs to por- phyry-type deposit. The important prospecting signage are: outcrops appeared molybdenite and molybdine, quartz stockwork around porphyry, beresitization alteration, geochemical anomaly of molybdenum. Outcrop of granitic porphyry of Dayaoshan area and Mo-Cu geochemical anomalies fit better region are the potential prospecting area. Contact zone of southwestern Dali granite, east part of the Dali granite are favorable for finding ore deposit, and should be the most potential prospecting targets.
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