The genesis of ca. 1.78 Ga granitoids in the Xiong'er large igneous province: Implications for continental crust generation
文献类型：期刊论文
| 作者 | Ma, Jian-Feng1,2,4; Qu, Chuan-Hao1,2,4; Zhou, Yan-Yan3; Zhao, Tai -Ping1,2 |
| 刊名 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
 |
| 出版日期 | 2023-11-01 |
| 卷号 | 135期号:11-12页码:3213-3227 |
| ISSN号 | 0016-7606 |
| DOI | 10.1130/B36694.1 |
| 英文摘要 | The genesis of intermediate-felsic rocks and the implications for crustal growth are highly controversial. These issues are particularly relevant to large igneous provinces, which are one of the most effective methods of crustal generation. Mafic magmas, even those with continental marks, have been considered as the contribution from mantle to crust, whereas the intermediate-felsic series in large igneous provinces has uncertain implications for crustal growth due to uncertainty about their modes of generation. In this paper, we focus on the intermediate-felsic granitoids, i.e., Gushicun diorites and granites, in the Xiong'er large igneous province (ca. 1780-1750 Ma) through detailed study of their petrology, chronology, and geochemistry. Our new data show that both diorites and granites have the same emplacement age of ca. 1780 Ma and were synchronized with the Xiong'er large igneous province. The granitoids are characterized by enrichment in light rare earth elements (LREEs) and large ion lithophile elements (LILEs; e.g., Li, Ba, and Rb) but depletion in high field strength elements (HFSEs; e.g., Nb, Ta, and Ti). They have almost the same Sigma REE (rare earth element) contents and TTi-Zircon (similar to 850 degrees C), whole-rock Nd (epsilon Nd-(t) from -8.24 to -5.76), zircon Hf (epsilon Hf-(t) isotope ratios of -14 to -8 isotope ratios), and O-isotope compositions (average delta O-18 = 5.3 parts per thousand). The fine-grained Gushicun diorites have low Sr/Nd (<10) and Eu/Sm (<0.3) but high Si/Al (>3.2) ratios and are similar to the basaltic andesites in the Xiong'er large igneous province, which suggests that the diorites are crystallization melts that differentiated along the liquid line of descent. The Rayleigh fractionation model based on the REE contents shows that the Gushicun diorites were formed by 40%-50% fractional crystallization of Xiong'er basaltic melts. The characteristics of high K2O (3.8-4.7 wt%) and Yb contents (4.0-6.5 ppm), low Sr/Y (1.4-3.3), and low metaluminous values (A/CNK = 0.8-1.1) of the Gushicun granites with mantle-like O-isotope values rule out the melting genesis of low K2O (<0.5 wt%) amphibolite and trondhjemite-tonalite-granodiorites (TTGs) of the surrounding Taihua Complex. The Gushicun granites show a geochemical affinity with andesites in the Xiong'er large igneous province. The alphaMELTs simulation based on the major elements argues against the partial melting of amphibolite and TTGs but supports the melting genesis of Xiong'er intermediate igneous rocks with low water contents (<1 wt%). These findings shed light on the formation of the felsic series in large igneous provinces, which remelted the previous mafic-intermediate rocks via underplating basaltic magmas. Despite having enriched Nd- and Hf-isotope features, the Gushicun diorites represent juvenile crust, while the granites were formed by the reworking of juvenile crust instead of ancient crust. This paper also suggests that radiogenic isotopic ratios cannot be reliably used to assess types of continental crust. |
| WOS关键词 | NORTH CHINA CRATON ; A-TYPE GRANITES ; SIERRA-NEVADA BATHOLITH ; TIME-SERIES ANALYSIS ; S-TYPE GRANITES ; SOUTHERN MARGIN ; I-TYPE ; GEOCHEMICAL CONSTRAINTS ; TAIHUA COMPLEX ; U-PB |
| 资助项目 | National Natural Science Foundation of China ; National Key Research and Development Project of China[41630211] ; National Key Research and Development Project of China[2020YFA0714803] |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| 出版者 | GEOLOGICAL SOC AMER, INC |
| WOS记录号 | WOS:001097004300001 |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/110653]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 通讯作者 | Zhao, Tai -Ping |
| 作者单位 | 1.Chinese Acad Sci, Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangzhou 510460, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ma, Jian-Feng,Qu, Chuan-Hao,Zhou, Yan-Yan,et al. The genesis of ca. 1.78 Ga granitoids in the Xiong'er large igneous province: Implications for continental crust generation[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2023,135(11-12):3213-3227. |
| APA | Ma, Jian-Feng,Qu, Chuan-Hao,Zhou, Yan-Yan,&Zhao, Tai -Ping.(2023).The genesis of ca. 1.78 Ga granitoids in the Xiong'er large igneous province: Implications for continental crust generation.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,135(11-12),3213-3227. |
| MLA | Ma, Jian-Feng,et al."The genesis of ca. 1.78 Ga granitoids in the Xiong'er large igneous province: Implications for continental crust generation".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 135.11-12(2023):3213-3227. |
入库方式： OAI收割
来源：地质与地球物理研究所
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