江南造山带九岭南缘宜丰岩组火山岩锆石SHRIMP年代学及Hf同位素特征

论文摘要

赣西北九岭南缘宜丰岩组是江南造山带的一个重要地层单元,但其沉积时限和区域地层对比关系尚不确定。本次1∶5万区调工作中,在万载—宜丰一带宜丰岩组地层中发现有呈夹层产出的变英安岩、变凝灰岩。SHRIMP锆石定年表明,变英安岩、变凝灰岩分别形成于835.0±7.8Ma和830.3±9.5Ma。结合宜丰岩组底部凝灰质砂岩最年轻的一组碎屑锆石U-Pb年龄852.9±2.6Ma,认为宜丰岩组沉积时限为～853 Ma至～830Ma,表明宜丰岩组主体形成于新元古代早期。锆石Hf同位素显示,εHf（t）变化范围较大,为-16.02～+12.04,总体以正值为主。最为接近亏损地幔成分的5个锆石颗粒的εHf（t）变化范围为+9.65～+12.04,具有最年轻的Hf二阶段模式年龄0.95～1.09Ga,与成岩年龄差距不大,表明源区中可能有新生地壳物质的加入。野外沉积学研究表明,宜丰岩组浊流沉积构造发育,主体属于半深海大陆斜坡沉积。区域上,宜丰岩组与溪口岩群、双桥山群、冷家溪群、西村岩组、南桥岩组、苍溪岩组沉积时限基本相当,沉积环境相似,应明确为华南"晋宁运动"不整合面之下的一套弧后盆地环境产物。

论文目录

文章来源

类型: 期刊论文

作者: 周效华,陈荣,张炜,李春海,高天山,马雪,朱清波,靳国栋

关键词: 九岭南缘,宜丰岩组,火山岩,定年,同位素,新元古代,江南造山带

来源: 地质学报 2019年05期

年度: 2019

分类: 基础科学

专业: 地质学

单位: 中国地质调查局南京地质调查中心

基金: 中国地质调查局项目(编号121201008000160903,12120114039001),国家重点研发计划(编号2016YFC06002000)资助成果

分类号: P588.14;P597.3

DOI: 10.19762/j.cnki.dizhixuebao.2019057

页码: 1069-1080

总页数: 12

文件大小: 13540K

下载量: 140

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标签：九岭南缘论文;  宜丰岩组论文;  火山岩论文;  定年论文;  同位素论文;  新元古代论文;  江南造山带论文;