论文摘要
鉴于目前对华北克拉通北缘承德下板城盆地三叠系二马营组的时代归属存在较大的分歧,本文以该盆地二马营组上段一厚层火山凝灰岩为研究对象,对其进行高精度的SHRIMP锆石U-Pb定年及原位Lu-Hf同位素分析,以准确厘定其沉积时代与来源区。定年结果显示,该凝灰岩层的沉积年龄为（243.5±3.3）Ma。依据定年结果及前人研究成果,认为盆地二马营组的沉积时代应为中三叠世早期,即中三叠世安尼期,而不是一些学者认为的晚三叠世或中-晚三叠世。对年龄较为集中的锆石进行了原位Lu-Hf同位素分析,表明其具有较低的εHf（t）值（-7.7～-6.1）和较老的二阶段模式年龄（1.66～1.76Ga）。结合凝灰岩定年结果中所携带的继承锆石信息,以及前人研究成果,表明火山凝灰岩应来源于华北克拉通北缘的内蒙古隆起,而非其北邻的兴蒙造山带。
论文目录
文章来源
类型: 期刊论文
作者: 辛补社
关键词: 华北克拉通北缘,下板城盆地,二马营组,凝灰岩锆石定年,同位素分析
来源: 北京师范大学学报(自然科学版) 2019年06期
年度: 2019
分类: 基础科学
专业: 地质学
单位: 宁夏师范学院政治与历史学院
基金: 宁夏高等学校一流学科建设（教育学学科）基金资助项目（NXYLXK2017B11）
分类号: P597.3;P534.46
DOI: 10.16360/j.cnki.jbnuns.2019.06.017
页码: 796-802
总页数: 7
文件大小: 3889K
下载量: 75
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