Effect of F-Rich Fluids on the A-Type Magmatism and Related Metal Mobilization:New Insights from the Fogang-Nankunshan-Yajishan Igneous Rocks in Southeast China
文献类型：CNKI期刊论文
| 作者 | Xing Ding; Koulin Su; Haibo Yan; Jinlong Liang; Weidong Sun
|
| 发表日期 | 2022-06-14 |
| 出处 | Journal of Earth Science
 |
| 关键词 | A-type granite alkaline F-rich fluids slab rollback rare metal rare earth elements Nb/Ta |
| 英文摘要 | About 45% of tungsten,～20% of tin,and ～9% of fluorite of known world reserves are associated with Late Mesozoic igneous rocks,Southeast(SE) China.Here we demonstrate that Fogang granite,the largest inland batholith,is mainly of A2-type that is commonly found in post-orogenic settings and experienced plate subduction induced metasomatism.In contrast,the Yajishan syenite and Nankunshan granite intruding the Fogang granite ～20 Ma later are of A1-type formed in intraplate settings.We found that F-rich fluid fractionation,which could make the decline of Ga/Al ratio,total(Nb +Y + Ce + Zr) and Zr concentrations,Nb/Ta and Zr/Hf ratios,leads to chemical variations of a few Fogang granites changing from A2-type to highly fractionated or I-and S-type granitoids.Crystal and Frich fluid fractionations,as well as crustal contamination most likely derived from the Fogang granite,result in some Nankunshan granites developing from A1-type into A2-type.These late-or post-magmatic processes should be taken into account carefully when discriminating the petrogenetic types of igneous rocks,especially for the A2-type suites.Combining with the distribution of 180–140 Ma A1-and A2-type igneous rocks,rare metal deposits,and fluorite deposits in SE China,we highlight the significant role of slab-released F-rich fluids in formation of A-type suites and subsequent chemical differentiation and rare metal and fluorine mineralization.A model of flat-slab northeastward rollback is thus proposed,in which the subduction front reached somewhere near Fogang and then started to roll back at ～165 Ma.The inland Jurassic granites of SE China represent a unique locality for formation of A-type suites and their associated mineralization.These granites are not anorogenic,but they are the result of slab rollback from a flat slab,founding of that slab at shallow levels,and metasomatism of by F-rich fluids related to slab heating by the asthenosphere. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | supported by the Guangdong Major Project of Basic and Applied Basic Research (No.2019B030302013) ; the Strategic Priority Research Program of Chinese Academy of Sciences (No.XDB42000000) ; the National Natural Science Foundation of China (No.41773054) ; the National Key R&D Program of China (No.2016YFC0600408) |
| 卷 | v.33期:03页:55-72 |
| 语种 | 英文; |
| 分类号 | P588.1;P618.2 |
| ISSN号 | 1674-487X |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/187410]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.DepartmentofGeochemistry,ChengduUniversityofTechnology 2.LaboratoryforMarineMineralResources,QingdaoNationalLaboratoryforMarineScienceandTechnology 3.StateKeyLaboratoryofIsotopeGeochemistry,GuangzhouInstituteofGeochemistry,ChineseAcademyofSciences 4.CASCenterforExcellenceinDeepEarthSciences 5.GeologicalSurveyInstituteofGuangzhou 6.CenterofDeepSeaResearch,InstituteofOceanography,ChineseAcademyofSciences |
| 推荐引用方式 GB/T 7714 | Xing Ding,Koulin Su,Haibo Yan,et al. Effect of F-Rich Fluids on the A-Type Magmatism and Related Metal Mobilization:New Insights from the Fogang-Nankunshan-Yajishan Igneous Rocks in Southeast China. 2022. |
入库方式： OAI收割
来源：海洋研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。