李路路;杨宝忠;尹永会;刘龙龙;王兵;

• 1:中国人民武装警察部队黄金第七支队
• 2:中国地质大学(武汉)地球科学学院

摘要(Abstract)：

以柯坪塔格组灰绿色砂岩为研究对象,开展了系统的岩石地球化学和同位素年代学研究。结果表明,砂岩SiO_2质量分数较高,Na_2O、CaO、TiO_2质量分数较低;轻稀土元素富集,具明显的Eu负异常。碎屑锆石U-Pb年龄集中分布于1 000~700,2 500~1 800 Ma 2个区间,可能分别对应新元古代晚期南华纪-青白口纪的构造抬升运动和古元古代早期的强烈构造运动及岩浆侵位,个别锆石颗粒年龄超过2 500 Ma,2颗锆石年龄数据偏小,仅在437~435 Ma之间,可能与南天山洋俯冲导致的岩浆活动有关。分析表明,早志留世柯坪地区处于稳定的被动大陆边缘,碎屑物源主要来自塔北隆起前寒武纪古老的克拉通基底岩类。

关键词(KeyWords)： 柯坪塔格组;地球化学;物源区;U-Pb测年

Abstract:

Keywords:

基金项目(Foundation): 中国地质调查局西北沿边及特殊地区地质矿产调查二级项目(DD20160079)

作者(Author): 李路路;杨宝忠;尹永会;刘龙龙;王兵;

Email:

DOI: 10.19509/j.cnki.dzkq.2017.0201

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