李余亮,刘鑫,陈留勤,郭福生,王凤之,李文灏,王宇佳

• 1:东华理工大学省部共建核资源与环境国家重点实验室培育基地
• 2:东华理工大学地球科学学院

摘要(Abstract)：

江西贵溪地区的晚白垩世圭峰群塘边组以紫红色细粒碎屑岩为主,通过对采自贵溪剖面16个细粒砂岩样品的主、微量元素地球化学分析,可以为认识赣东北地区晚白垩世陆相红层的物源区构造背景、古气候条件提供重要证据。该砂岩样品的地球化学分析结果表明,物源区构造背景为被动大陆边缘,主要为沉积岩和花岗岩的混合为特征。稀土元素标准化配分曲线呈轻稀土明显富集、重稀土平坦和弱Eu异常特征,沉积物源岩的原始物质应来自上地壳,以长英质岩石为主。结合区域地质特征,认为研究区基底新元古代变质岩及燕山期火山-侵入杂岩在断陷盆地形成、发展过程中提供了主要的碎屑物源。经过校正的化学蚀变指数(CIA)为70~76,反映了较低的古风化条件,进而指示了赣东北地区塘边组沉积时期(Campanian期)干旱、炎热的的古气候条件。

关键词(KeyWords)： 物源;古风化;元素地球化学;晚白垩世;赣东北

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(41602113);; 江西省国防科技创新团队建设项目;; 东华理工大学省部共建核资源与环境国家重点实验室培育基地开放基金(NRE1605)

作者(Author): 李余亮,刘鑫,陈留勤,郭福生,王凤之,李文灏,王宇佳

DOI: 10.19839/j.cnki.dcxzz.2018.02.010

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