摘要
冷水坑斑岩型银铅锌矿床是中国目前唯一的典型斑岩型银铅锌矿床,对于该矿床的成矿斑岩的形成时代至今仍没有精确的年龄数据。本文通过对冷水坑斑岩型银铅锌矿床成矿斑岩(花岗斑岩)样品中的锆石11个测试点的SHRIMP锆石U-Pb年代学研究,得出206Pb/238U加权平均年龄为(162.0±2)Ma(MSWD=1.4),因此,认为冷水坑花岗斑岩的形成年代为(162.0±2)Ma。冷水坑含矿斑岩成岩年龄与成矿年龄高度一致,成岩年龄与成矿作用开始时间差异不明显。此外,由冷水坑矿床成岩和成矿年龄数据推断出矿化持续时间约27Ma。
The Lengshuikeng porphyry Ag-Pb-Zn deposit is a unique typical porphyry Ag-Pb-Zn deposit in China,and no precise data concerning the porphyry mineralization age are available.Based on the SHRIMP zircon U-Pb chronologic study of 11 test points of zircon samples from Lengshuikeng porphyry Ag-Pb-Zn mineralized porphyry（granite porphyry）,the authors obtained a weighted average 206Pb/238U age of（162.0 ± 2） Ma（MSWD = 1.4）.Therefore,the Lengshuikeng granite porphyry was formed in（162.0 ± 2） Ma.Lengshuikeng porphyry geochronological ages of rock formation and ore formation show a high degree of consistency.There is no significant difference between rock-forming and initial ore-forming geochronological ages.In addition,the mineralization age deduced from rock-forming and ore-forming geochronological ages is about 27Ma in the Lengshuikeng ore deposit.
出处
《中国地质》
CAS
CSCD
北大核心
2010年第5期1450-1456,共7页
Geology in China
基金
江西地勘局912大队与中国地质科学院矿产资源所合作项目"江西冷水坑银铅锌多金属矿成矿系统及隐伏矿预测研究"资助
