兴城市龙王咀子地区花岗岩岩石地球化学、年代学特征及与铀成矿关系
DOI:
作者:
作者单位:

作者简介:

通讯作者:

中图分类号:

P596

基金项目:

国家自然科学基金(40272099);中国核工业地质局铀矿勘查项目(1212011220784)第一作者:曲晓梅(1995—),女,汉族,山西太原人,硕士研究生。研究方向:构造地质学。E-mail:1967984228@qq.com。通信作者:聂逢君(1962—),男,汉族,湖南祁阳人,博士,教授。研究方向:沉积盆地分析与铀矿成矿找矿研究。E-mail:niefj@263.net。 , 聂逢君1 ,严兆彬1 ,孟繁敏1 , 张成勇1 ,张 鑫1 ,陈梦雅1


Geochemical and chronological characteristics of granites in Longwangzuizi area, Xingcheng city and its relationship with uranium mineralization
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    龙王咀子位于青龙—锦西复杂构造带与西平坡—锦西壳断裂交叠部位,地处辽西重要的青龙—锦西铀金多金属成矿带的东段。通过对龙王咀子地区似斑状黑云母花岗岩进行岩相学、地球化学和锆石的U-Pb测年研究,岩石的成岩年龄为(165.4±1.8)Ma,为燕山早期。样品的SiO2值为65.79%~75.61%,全碱ALK(NaO2+K2O)值为7.02%~8.99%,A/CNK值为1.49~1.73,K2O/Na2O值为0.72~2.34;AR值为2.68~4.89;里特曼指数值为1.65~3.04;固结指数(SI)值为1.66~9.20;岩浆分异指数(DI)在78.08~93.17之间,表明岩石为过铝质、钙碱性岩系列的高分异I型花岗岩。岩石的稀土总量高,变化幅度较大(Σw93.46ppm~336.97ppm);Σw(LREE)/Σw(HREE)=8.07~17,w(LaN /YbN)=14.53~20.6),轻重稀土分异较强,表现为轻稀土富集而重稀土亏损,地球化学特征与华南产铀花岗岩地球化学特征相似,显示岩石有利利于铀成矿。岩石强烈亏损Ba、Th、Sr和Zr和Nb,明显富集Rb、U、Pb。结合岩石的地球化学特征、成岩年龄以及区域构造演化,认为岩石形成于后碰撞造山的陆内环境,燕山期花岗岩的上侵是区域内矿铀化的主导因素。

    Abstract:

    Longwangzuizi is located in the overlapping position of Qinglong—Jinxi complex structural belt and Xipingpo—Jinxi crust fault, and in the eastern part of the important Qinglong —Jinxi uranium gold polymetallic metallogenic belt in western Liaoning.Based on the petrography, geochemistry and zircon U-Pb dating of the porphyritic biotite granite in Longwangzuizi area, the diagenetic age of the granite is (165.4 ± 1.8) MA , which belongs to the early Yanshanian period.The SiO2 value of the sample is 65.79%~75.61%, the total alkali ALK (Na2O + K2O) value is 7.02%~8.99%, the A/CNK value is 1.49~1.73, the K2O/Na2O value is 0.72~2.34, the AR value is 2.68~4.89, the ritmann index is 1.65~3.04, the consolidation index (SI) is 1.66~9.20, and the magmatic differentiation index (DI) is 78.08~93.17, indicating that the rocks are peraluminous and calc-alkaline I-type granites of high fractionation in the rock series.The total amount of REE in the rocks is high, and the range of variation is large (∑w 93.46ppm~336.97ppm); ∑w (LREE) /∑w (HREE) = 8.07~17, w (LaN /YbN)= 14.53-20.6,the difference between light and heavy rare earths is strong, LREE is enriched and HREE is depleted, REE distribution curve is inclined to the right and nearly straight line "Seagull type", EU is depleted strongly (δEU = 0.01~0.76), which is similar to the geochemical characteristics of uranium bearing granites in South China, indicating that the rocks are beneficial to uranium mineralization.Compared with the original mantle, the rocks have strong losses of Ba, Th, Sr, Zr and Nb, and are obviously enriched with Rb, U and Pb. Based on the geochemical characteristics, diagenesis age and regional structural evolution of rocks, it is considered that the rocks are formed in the post collisional orogenic environment. The intrusion of Yanshanian granite is the main factor of uranium mineralization in the region.

    参考文献
    相似文献
    引证文献
引用本文

曲晓梅,聂逢君,严兆彬,等. 兴城市龙王咀子地区花岗岩岩石地球化学、年代学特征及与铀成矿关系[J]. 科学技术与工程, 2022, 22(3): 918-930.
Qu Xiaomei, Nie Fengjun, Yan Zhaobin, et al. Geochemical and chronological characteristics of granites in Longwangzuizi area, Xingcheng city and its relationship with uranium mineralization[J]. Science Technology and Engineering,2022,22(3):918-930.

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2021-04-16
  • 最后修改日期:2021-11-09
  • 录用日期:2021-09-22
  • 在线发布日期: 2022-01-27
  • 出版日期:
×
律回春渐,新元肇启|《科学技术与工程》编辑部恭祝新岁!
亟待确认版面费归属稿件,敬请作者关注