首页 | 本学科首页   官方微博 | 高级检索  
     检索      

纳米比亚欢乐谷地区斑状花岗岩成因及构造背景
引用本文:王生云,范洪海,陈金勇,顾大钊,陈东欢,高阳,聂江涛.纳米比亚欢乐谷地区斑状花岗岩成因及构造背景[J].世界地质,2013,32(4):773-782.
作者姓名:王生云  范洪海  陈金勇  顾大钊  陈东欢  高阳  聂江涛
作者单位:1. 核工业北京地质研究院,北京 100029; 2. 中核铀资源勘查与评价技术重点实验室,北京 100029; 3. 南京大学 内生金属矿床成矿机制研究国家重点实验室,南京 210093
摘    要:对纳米比亚欢乐谷地区斑状花岗岩进行系统的地球化学及 Sr--Nd 同位素研究,并对其岩石成因及构造意义进行了讨论。结果表明,该斑状花岗岩为高钾钙碱性-钾玄岩系列的准铝质花岗岩; 岩石富碱、轻稀土和 Rb、Th、U、K、Pb 等大离子亲石元素,贫 Nb、Ta、Ti、Zr、Hf 等高场强元素,具有中等铕负异常。岩石锶初始值为 0. 715 61 ~0. 722 07,εNd( t) 为 -13. 9 ~ -12. 7,Nd 同位素模式年龄为2 025 ~2 153 Ma。揭示欢乐谷地区斑状花岗岩为同碰撞 S 型花岗岩,主要来源于古老地壳物质的重熔,是 Kalahari 克拉通和 Congo 克拉通碰撞造山的产物。

关 键 词:斑状花岗岩  岩石成因  碰撞造山  欢乐谷地区  纳米比亚

Petrogenesis and tectonic setting of porphyritic granites in Gaudeanmus area,Namibia
WANG Sheng-yun FAN Hong-hai CHEN Jin-yong GU Da-zhao CHEN Dong-huan,GAO Yang,NIE Jiang-tao.Petrogenesis and tectonic setting of porphyritic granites in Gaudeanmus area,Namibia[J].World Geology,2013,32(4):773-782.
Authors:WANG Sheng-yun FAN Hong-hai CHEN Jin-yong GU Da-zhao CHEN Dong-huan  GAO Yang  NIE Jiang-tao
Institution:1. Beijing Research Institute of Uranium Geology,Beijing 100029,China; 2. Key Laboratory of Uranium Resource Exploration and Evaluation Technology,CNNC,Beijing 100029,China; 3. State Key Laboratory for Mineral Deposits Research,Nanjing University,Nanjing 210093,China
Abstract:The authors studied the geochemical characteristic and Sr-Nd isotope of the porphyritic granites in the Gaudeanmus area, Namibia and discussed the petrogenesis and tectonic significance. The results indicate the porphyritic granites showing the characteristics of metaluminous, belonging to high-K calc-alkaline to shoshonite se- ries. The granites contained high alkali and rare eatth elements (REE) , enriched in large-ion lithopile elements (Rb, Th, U, K, Pb), and depleted in high field-strength elements (Nb, Ta, Ti, Zr, Hf), with medium negative Eu anomalies. These rocks have high initial STSr/86Sr ratios (0. 715 61 -0. 722 07), low intial 8Nd (t) values ( - 13.9 - - 12. 7) and ancient Nd isotope crust model ages (2 025 -2 153 Ma). Such geochemical signa- ture showed that the porphyritic granites were syn-collision S-type granite in characteristics and derived from partial melting of ancient crustal rocks during the main periods collision of Kalahari and Congo craton.
Keywords:porphyritic granites  petrogenesis  collision and orogen  Gaudeanmus area  Namibia
本文献已被 维普 等数据库收录!
点击此处可从《世界地质》浏览原始摘要信息
点击此处可从《世界地质》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号