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滇西澜沧老厂银铅锌多金属矿床是“三江”成矿带南段代表性大型银铅锌多金属矿床之一,矿区火山岩广泛分布,是该区重要的含矿岩性之一。利用锆石SHRIMPU-Pb定年方法对老厂矿区火山岩进行了定年,获得成岩年龄为323.6±2.8Ma(MSWD=1.17;12个测点),表明火山岩成岩时代为早石炭世。根据老厂矿区火山岩与滇西金沙江和哀牢山缝合带蛇绿岩具有相近的成岩年龄,认为金沙江构造带、哀牢山构造带和澜沧江构造带在“三江”地区古特提斯打开之后属于同一相连的古洋盆。
The silver-lead-zinc polymetallic deposit of Lanchang Old Factory in Western Yunnan is one of the representative large silver-lead-zinc polymetallic deposits in the southern part of the “Sanjiang” metallogenic belt. The volcanic rocks in the mine area are widely distributed and are important ore-bearing lithologies in the area one. The zircon dating of SHRIMPU-Pb was used to age the volcanic rocks in Laochang mining area, and the diagenetic age was 323.6 ± 2.8Ma (MSWD = 1.17; 12 measuring points), indicating that the volcanic diagenetic period was Early Carboniferous. Based on the similar diagenetic ages of the volcanic rocks in the Lao Chang mine zone and the ophiolite rocks in the Jinsha River and Ailao Mountains in western Yunnan, it is concluded that the Jinshajiang structural belt, the Ailaoshan structural belt and the Lancangjiang structural belt are in the “Sanjiang” area. After opening, it belongs to the same old oceanic basin.