Petrogenesis of the Fogang highly fractionated I-type granitoids: Constraints from Nb, Ta, Zr and Hf
文献类型：期刊论文
| 作者 | Chen JingYuan1,2; Yang JinHui1 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2015-03-01 |
| 卷号 | 31期号:3页码:846-854 |
| 关键词 | Zr/Hf and Nb/Ta Granite Geochemistry Genetic classification South China |
| 文献子类 | Article |
| 英文摘要 | Jurassic granitoids are widespread in the interior of South China. However, the genetic types of some plutons are still controversial. In this paper, we show an example (Fogang batholith) of how to distinguish I-, S- and A-type granitoids. Fogang batholith is the largest Jurassic granitic pluton, located in the Guangdong Province. With increasing differentiation, the contents of Nb and Ta progressively increase, whereas those of Zr and Hf show gradual decrease. Both Nb/Ta and Zr/Hf ratios show decrease with the fractionation of granitoids (15.3 similar to 3.6 and 38.9 similar to 17.3 respectively). Fractionation of zircons result in lower Zr/Hf ratio with strongly decreasing Zr concentration. Fractionation of amphibole and biotite produce decreased Nb/Ta ratio with the differentiation of granitoids. The Nb/Ta ratios of the Fogang granites correlate positively with Y/Ho ratios, indicating that the fluid also played a key role in the variation of the contents of Nb and Ta and Nb/Ta ratios in Fogang granitoids. The absence of Al-rich minerals and the negative correlation between Zr and P2O5 preclude the Fogang batholith to be S-type granite. Ga/Al and FeOT/MgO ratios correlate positively with the Ta and Nb contents, and Y/Ho and Nb/Ta ratios, implying that the high Ga/Al and FeOT/MgO ratios of Fogang granites result from fractionation and fluid-magma interaction. Therefore, the Fogang batholith is deduced to be metaluminous to slightly peraluminous I-type granitoids rather than A-type granites. This work highlights that the fluid-melt/rock interaction makes it difficult to directly define the genetic types of some granitic plutons. |
| WOS关键词 | A-TYPE GRANITES ; SOUTH CHINA ; TECTONIC IMPLICATIONS ; CONTINENTAL-CRUST ; SUZHOU GRANITE ; ZR/HF RATIOS ; EVOLUTION ; NB/TA ; ZIRCON ; MANTLE |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000353092700017 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/62604]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen JingYuan,Yang JinHui. Petrogenesis of the Fogang highly fractionated I-type granitoids: Constraints from Nb, Ta, Zr and Hf[J]. ACTA PETROLOGICA SINICA,2015,31(3):846-854. |
| APA | Chen JingYuan,&Yang JinHui.(2015).Petrogenesis of the Fogang highly fractionated I-type granitoids: Constraints from Nb, Ta, Zr and Hf.ACTA PETROLOGICA SINICA,31(3),846-854. |
| MLA | Chen JingYuan,et al."Petrogenesis of the Fogang highly fractionated I-type granitoids: Constraints from Nb, Ta, Zr and Hf".ACTA PETROLOGICA SINICA 31.3(2015):846-854. |
入库方式： OAI收割
来源：地质与地球物理研究所
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