摘要
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。
Laochang large silver-lead-zinc deposit in Western Yunnan Province is a large lead-zinc deposit in Southern Section of ＂sanjiang＂Metallogenic belt.Volcanic rock is widely distributed in the mining area,and is one of important ore-bearing rocks.Volcanic rocks of Laochang mine area were dated with the zircon SHRIMP U-Pb method.The zircon SHRIMP U-Pb dating at 220.9±3.5 Ma（MSWD = 1.17,12 monitoring points）shows that the Petrogenic Age of volcanic rocks is early carboniferous.Based on volcanic rocks of Laochang mine area having similar Petrogenic Age with ophiolite of Jinsha River in Western Yunnan Province and Ailaoshan suture belt,it is considered that Jinsha River tectonic belt,Ailaoshan tectonic belt and Lancang River tectonic belt belonged to same coterminous ancient ocean basin after opening of paleo-tethys in the three-river area.
出处
《矿物学报》
CAS
CSCD
北大核心
2010年第4期456-462,共7页
Acta Mineralogica Sinica
基金
中国科学院重要方向项目(KZCX2-YW-111-3)
国家"973"计划项目(2007CB411402)
