贵州铜仁瓦屋牛蹄塘组下部凝灰岩锆石年龄及其地质意义
Guizhou Geology(2022)
Abstract
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.
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