摘要
运用LA-ICP-MS技术,对牛蹄塘组凝灰岩夹层进行锆石U-Pb年代学测试,获得凝灰岩的年龄为546.3±4.3 Ma,该年龄与Chen等(2003)运用Pb-Pb淋滤法获得的遵义中南和织金牛蹄塘组黑色页岩的沉积年龄(531±24 Ma)在误差范围内一致,与卓皆文等(2009)运用锆石U-Pb年代学获得铜仁坝黄震旦纪老堡组顶部晶屑凝灰岩的年龄(556±5Ma)比较,二者与地层沉积时序一致,年龄跨度也很合理;与许多学者对华南早寒武世早期“多元素富集层”的Re-Os同位素定年结果一致,暗示“多元素富集层”的成矿物质来源可能与这期火山作用密切相关。
By using LA-ICP-MS technology,zircon U-Pb chronology of tuff intercalation of Niutitang formation is tested,it’s known the age of tuff is 546.3±4.3 Ma,which is consistent with the sedimentary age(531±24 Ma)of black shale of Zhongnan in Zunyi and Niutitang Formation in Zhijin obtained by Chen et al.(2003)using Pb Pb leaching method,which is consistent with Zhuo Junwen et al.(2009)The 556±5 Ma zircon U-Pb age measured in the detrital tuff at the top of Laobao formation of huangsinian in tongrenba is consistent with the stratigraphic sedimentary time series,and the age span is also very reasonable;It is consistent with the Re-Os isotopic dating results of“multi-element enrichment layer”in early Early Cambrian in South China by many scholars,suggesting that the metallogenic material source of“multi-element enrichment layer”may be closely related to this stage of volcanism.
作者
牟军
强希润
覃永军
王安华
张厚松
Mou Jun;Qiang Xi-run;Qin Yong-jun;Wang An-hua;Zhang Hou-song(Guizhou Geological Survey,Guiyang 550081,Guizhou,China;Guizhou Bureau of Geology and Mineral Exploration and Development,Guiyang 550004,Guizhou,China;Engineering Technology Innovation Center of Mineral Resources Explorations in Bedrock Zones,Ministry of Natural Resources,Guiyang 550081,Guizhou,China)
出处
《贵州地质》
2022年第1期39-47,共9页
Guizhou Geology
基金
中国地质调查局“贵州1∶5万漾头司、万山特区、瓦屋、新晃4幅区域地质矿产调查”项目(项目编码121201010000150011-02)
贵州省科技计划项目(黔科合基础[2019]1179,黔科合[2016]平台人才5401,黔科合支撑[2019]2851)。
