论文摘要
华北克拉通南缘结晶基底之上广泛发育中-新元古代（1800～542Ma）盖层岩系,但由于缺少精确的同位素年龄数据,其地层划分和对比方案一直存在较大的争议。本次工作在河南省栾川县龙家园组底部和下部各发现了一套凝灰岩,进而获得了1594±12Ma和1541±8Ma的SHRIMP锆石U-Pb年龄,首次精确标定了该地区龙家园组的形成时限,该组底界的时代接近1600Ma。龙家园组沉积时代为中元古代蓟县纪最早期;在河南省汝阳、汝州、鲁山地区的洛峪口组凝灰岩中获得了1596±7Ma、1596±15Ma、1608±17Ma和1620±16Ma的SHRIMP锆石U-Pb年龄,进一步精确标定了洛峪口组的形成时代,洛峪口组形成于长城纪的末期。结合汝阳群云梦山组碎屑锆石U-Pb年龄结果,汝阳群-洛峪群的形成时限约为1700～1600Ma。官道口群应是汝阳群之后的地层系统,而不是早前认为的与之同期的地层。
论文目录
文章来源
类型: 期刊论文
作者: 张恒,高林志,周洪瑞,宋彪,丁孝忠,张传恒,刘昊岗,龚成强
关键词: 华北克拉通南缘,龙家园组,洛峪口组,锆石
来源: 岩石学报 2019年08期
年度: 2019
分类: 基础科学
专业: 地质学
单位: 中国地质科学院地质研究所,中国地质大学
基金: 中国地质调查局地质调查项目(DD20190370),国家自然科学基金项目(41572024),科技部基础性工作专项(2015FY310100)联合资助
分类号: P588.21;P597.3
页码: 2470-2486
总页数: 17
文件大小: 25121K
下载量: 217
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