|
|||||
|
|
| 桂东北里松花岗岩中暗色包体的岩浆混合成因 | |
| 引用本文： | 朱金初,张佩华,谢才富,张辉,杨策.桂东北里松花岗岩中暗色包体的岩浆混合成因[J].地球化学,2006,35(5):506-516. |
| 作者姓名： | 朱金初 张佩华 谢才富 张辉 杨策 |
| 作者单位： | 1. 南京大学,内生金属矿床成矿机制研究国家重点实验室,江苏,南京,210093 2. 南京大学,内生金属矿床成矿机制研究国家重点实验室,江苏,南京,210093;中国地质科学院,宜昌地质矿产研究所,湖北,宜昌,443003 3. 中国科学院,地球化学研究所,贵州,贵阳,550002 |
| 摘 要： | 在桂东北姑婆山地区的里松花岗岩中,暗色包体广泛分布,包体的形貌、结构构造和矿物学特征表明,它们是岩浆快速冷凝结晶产物;主元素和微量元素组成说明它们属钾玄岩系列,其源岩具OIB型微量元素特征;包体与寄主花岗岩中锆石U-Pb年龄的相同性,排除了来源于深部固体岩石熔融残留体或浅部围岩捕虏体的可能性,而两种岩石化学成分、岩石结构暗色包体和寄主花岗岩在岩石结构和全岩Sr-Nd同位素组成方面的明显差别性,又排除了同源包体或析离体、堆积体的可能性。里松花岗岩在很多地质-地球化学特征上都介于里松暗色包体和姑婆山主体花岗岩之间,里松暗色包体的总体特征显示了岩浆混合成因,是里松暗色包体岩浆与姑婆山主体花岗岩岩浆发生混合时不完全混合的残留物。 |
| 关 键 词： | 花岗岩 暗色包体 岩浆混合 岩石成因论 里松 南岭 |
| 文章编号： | 0379-1726(2006)05-0506-11 |
| 收稿时间： | 2005-12-15 |
| 修稿时间： | 2006-04-21 |
Magma mixing origin of the mafic enclaves in Lisong Granite, NE Guangxi, western Nanling Mountains |
|
| ZHU Jin-chu,ZHANG Pei-hua,XIE Cai-fu,ZHANG Hui,YANG Ce.Magma mixing origin of the mafic enclaves in Lisong Granite, NE Guangxi, western Nanling Mountains[J].Geochimica,2006,35(5):506-516. | |
| Authors: | ZHU Jin-chu ZHANG Pei-hua XIE Cai-fu ZHANG Hui YANG Ce |
| Institution: | 1. State Key Laboratory for Mineral Deposits Research, Nanfing University, Nanjing 210093, China; 2. Yichang Institute of Geology and Mineral Resources, Chinese Academy of Geological Sciences, Yichang 443003, China; 3. Institute of Geochemistry, Chinese Academy of Sciences, Guiynag 550002, China |
| Abstract: | The mafic enclaves are widespread in the Lisong granite,NE Guangxi,western Nanling Mountains.Their morphological,structural,textural and mineralogical characteristics indicate that these enclaves are products of rapid quenching and crystallization of the intermediate-basic magmatic melts.Their compositions of rock-forming elements and trace elements demonstrate that they belong to the shoshonitic series.Their parent rocks possess OIB-type trace element characteristics.Their synchronous zircon U-Pb age with the Lisong hosting granite excludes the possibility of restite from the melted metamorphic rocks at greater depth and xenolith from the country rocks at shallower depth.The obvious difference in chemistry,petrographic texture and whole rock Sr-Nd compositions excludes the possibility of co-magmatic segregations and/or cumulate of the earlier stage crystallization.The Lisong granite is in many geologo-geochemical aspects intermediate between the Lisong enclaves and the synchronous Guposhan major boby granite.The integrated geologo-geochemical features of the mafic enclaves in Lisong granite demonstrate a magma mixing origin.They are remnants of incomplete mingling from the mafic magma. |
| Keywords: | granite dark enclaves magma mixing petrogenesis Lisong Nanling Mountains |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ | |