论文摘要
华北克拉通燕辽地区是中国中新元古代沉积地层的标准剖面区。蓟县群和青白口群已经取得了很多重要的高精度定年数据,但是长城群除了顶部大红峪组有了高精度定年以外,其他组还缺乏可靠的高精度定年数据。为了准确标定华北克拉通中元古界长城群串岭沟组的年龄,对采自河北宽城地区神仙岭剖面串岭沟组顶部火山岩凝灰岩锆石进行了SHRIMP U-Pb定年。结果表明所测锆石207Pb/206Pb表面年龄加权平均值为（1 634.8±6.9）Ma（95%置信度,MSWD=1.2,n=23）。可见长城群串岭沟组顶部的准确年龄为（1 634.8±6.9）Ma,表明长城群串岭沟组到大红峪组整体上属于中元古代地层。
论文目录
文章来源
类型: 期刊论文
作者: 刘典波,王小琳,张恒,石成龙
关键词: 锆石,定年,中元古界,串岭沟组,华北克拉通
来源: 地学前缘 2019年03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)地球科学与资源学院,江西应用技术职业学院资源环境与珠宝学院,中国地质科学院地质研究所
基金: 国家重点基础研究发展计划“973”项目(2011CB808806),自然资源部全国地质构造区划与区域地质调查综合集成项目(DD20160345),国家自然科学基金项目(41672336)
分类号: P597.3
DOI: 10.13745/j.esf.sf.2018.12.6
页码: 183-189
总页数: 7
文件大小: 4932K
下载量: 157
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