论文摘要
滇中昆阳群一直是华南前寒武纪地质研究的热点之一,其地层序列、时代与区域对比长期存在争议。通过对滇中易门县小街乡普家村-岔河水库剖面禄表组2个凝灰岩样品进行SHRIMP锆石U-Pb定年,获得禄表组凝灰岩的锆石206Pb/238U年龄为878.5±4.7Ma和878.0±4.0Ma,首次证实禄表组的形成时代为新元古代中期。禄表组凝灰岩SHRIMP锆石U-Pb年龄的获得,有利于正确认识昆阳群的划属关系,并为西南地区青白口纪地层格架的建立和对比提供可靠的年代学依据。
论文目录
文章来源
类型: 期刊论文
作者: 刘昊岗,张恒,张传恒,高林志,刘燕学,张继彪
关键词: 昆阳群,禄表组,锆石年龄,新元古代,滇中
来源: 地质通报 2019年07期
年度: 2019
分类: 基础科学
专业: 地质学
单位: 中国地质大学(北京),中国地质科学院地质研究所
基金: 中国地质调查局项目《全国地质构造区划与区域地质调查综合集成》(编号:DD20160345),《中国及邻区海陆大地构造研究和相关图件编制》(编号:DD20160343),科技部基金项目《中国标准地层建立——中国地层表的完善》(编号:2015FY310100)
分类号: P588.2;P597.3;P535
页码: 1183-1190
总页数: 8
文件大小: 2138K
下载量: 123
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