李功振,陈志洪.赣南遂川地区基性岩脉的性质及构造意义[J].地质找矿论丛,2021,36(1):76-82
赣南遂川地区基性岩脉的性质及构造意义
The nature and tectonic significance of basic dykes in Suichuan area, south Jiangxi province
投稿时间:2020-05-28  修订日期:2021-01-27
DOI:10.6053/j.issn.1001-1412.2021.01.009
中文关键词:  遂川  基性岩脉  锆石U-Pb测年  加里东期  赣南
英文关键词:Suichuan area  mafic dyke  zircons U-Pb age  Caledonian period  the south Jiangxi province
基金项目:中国地质调查局项目“江西1:25万兴国县幅区调(修测)(2015-2017)”(批准号:12120115030101)资助。
作者单位
李功振 四川省冶金地质勘查院, 成都 610061 
陈志洪 中国地质调查局南京地质调查中心, 南京 210016 
摘要点击次数: 140
全文下载次数: 198
中文摘要:
      文章以赣南遂川地区的基性岩脉为研究对象,通过野外地质观察和室内岩石学、地球化学以及锆石LA-ICP-MS U-Pb年龄测定分析,并对其岩石学、地球化学特征、形成时间、岩浆成因及构造环境等有关问题进行探讨。基性岩脉测年结果为446 Ma±6.6 M—-422.3 Ma±7.3 Ma,属加里东晚期区域性伸展环境的产物。主、微量元素分析显示基性岩墙为拉斑碱性系列,属于富钠基性岩类;稀土配分曲线与地幔岩浆型稀土元素曲线模式相似,说明岩浆来源与地幔岩浆有密切关系。赣南存在加里东期的酸性和基性侵入岩,反映了地壳构造环境由早期挤压环境渐变为后期伸展环境的演化过程。
英文摘要:
      This paper deals with the basic dykes in Suichuan area of the south Jiangxi province. Petrology, geochemical characteristics, formation time, magma genesis and tectonic environment of the dykes are discussed based on field observation and indoor petrological and zircon U-Pb dating analysis. Four samples are dated at 446 Ma±6.6 Ma, 431.9 Ma±5.7 Ma, 422.3 Ma±7.3 Ma and 426.6 Ma±6.9 Ma showing that the dykes are products of regional tension during the early Paleozoic Silurian late Caledonian period. Analysis of the trace and major elements shows that the mafic dykes fall into the tholeiite series and alkaline series belonging to the sodium-rich basite. Their REE patterns similar to those of mantle magma indicates that source material of the dykes are closely related to mantle rock. The both acid and basic intrusions of Caledonian period occur in the area reflect the crustal tectonic setting evolved from the early compression to the late extension in the area.
查看全文  查看/发表评论  下载PDF阅读器
关闭