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| DOI | 10.1016/j.gsf.2020.10.008 |
| Carboniferous ridge subduction in the Xingmeng Orogenic Belt: Constraints from geochronological, geochemical, and Sr-Nd-Hf isotopic analysis of strongly peraluminous granites and gabbro-diorites in the Xilinhot micro-continent | |
| Liu, Changfeng; Zhou, Zhiguang; Wang, Guosheng; Wu, Chen; Li, Hongying; Ma, Shiwei | |
| 通讯作者 | Liu, CF (通讯作者) |
| 发表日期 | 2021 |
| ISSN | 1674-9871 |
| 卷号 | 12期号:3 |
| 英文摘要 | The Xingmeng Orogenic Belt evolved through a long-lived orogeny involving multiple episodes of subduction and accretion. However, there is a debate on its tectonic evolution during the Late Paleozoic. Here, we report geo-chemical, geochronological, and isotopic data from strongly peraluminous granites and gabbro-diorites from the Sunidzuoqi-Xilinhot region. Zircon U-Pb ages suggest that the intrusive rocks were emplaced during the Early Carboniferous (333-322 Ma). The granites exhibit geochemical characteristics similar to S-type granites, with high SiO2 (72.34-76.53wt.%), Al2O3 (12.45-14.65wt.%), and A/CNK (1.07-1.16), but depleted Sr, Nb, and Ta contents. They exhibit positive epsilon(Nd)(t) and epsilon(Hf)(t) values (-0.3 to 2.8 and 2.7-5.7, respectively) and young Nd and Hf model ages (TDM2(Nd)=853-1110 Ma and TDM2(Hf)=975-1184 Ma), suggesting that they may be the partial melting products of heterogeneous sources with variable proportions of pelite, psammite, and metabasaltic rocks. The meta-gabbro-diorites from the Maihantaolegai pluton have low SiO2 (47.06-53.49 wt.%) and K2O (0.04-0.99 wt.%) contents, and demonstrate slight light rare earth element (REE) depletion in the chondrite-normalized REE diagrams. They have high zircon eHf(t) values (14.41-17.34) and young Hf model ages (TDM2 (Hf)=230-418 Ma), indicating a more depleted mantle source. The variations of the Sm/Yb and La/Sm ratios can thus be used to assess the melting degree of the mantle source from 5% to 20%, suggesting a quite shallow mantle melting zone. We propose that the petrogenesis and distribution of the strongly peraluminous granites and gabbro-diorites, as well as the tectonic architecture of the region, can be explained by a ridge subduction model. Based on these results, and previous studies, we suggest a southward ridge subduction model for the Sunidzuoqi-Xilinhot region. (C) 2021 ChinaUniversity of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. |
| 关键词 | NORTH CHINA CRATONCENTRAL INNER-MONGOLIABIMODAL VOLCANIC-ROCKSGREAT XINGAN RANGESUTURE ZONE CONSTRAINTSU JIMQIN BANNERTECTONIC SIGNIFICANCEI-TYPECHEMICAL CLASSIFICATIONGEOLOGICAL SIGNIFICANCE |
| 英文关键词 | Strongly peraluminous granites; Gabbro-diorite; Xingmeng Orogenic Belt; Carboniferous; Ridge subduction |
| 语种 | 英语 |
| WOS研究方向 | Geology |
| WOS类目 | Geosciences, Multidisciplinary |
| WOS记录号 | WOS:000636463500020 |
| 来源期刊 | GEOSCIENCE FRONTIERS
 |
| 来源机构 | 中国科学院青藏高原研究所 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/260272 |
| 推荐引用方式 GB/T 7714 | Liu, Changfeng,Zhou, Zhiguang,Wang, Guosheng,et al. Carboniferous ridge subduction in the Xingmeng Orogenic Belt: Constraints from geochronological, geochemical, and Sr-Nd-Hf isotopic analysis of strongly peraluminous granites and gabbro-diorites in the Xilinhot micro-continent[J]. 中国科学院青藏高原研究所,2021,12(3). |
| APA | Liu, Changfeng,Zhou, Zhiguang,Wang, Guosheng,Wu, Chen,Li, Hongying,&Ma, Shiwei.(2021).Carboniferous ridge subduction in the Xingmeng Orogenic Belt: Constraints from geochronological, geochemical, and Sr-Nd-Hf isotopic analysis of strongly peraluminous granites and gabbro-diorites in the Xilinhot micro-continent.GEOSCIENCE FRONTIERS,12(3). |
| MLA | Liu, Changfeng,et al."Carboniferous ridge subduction in the Xingmeng Orogenic Belt: Constraints from geochronological, geochemical, and Sr-Nd-Hf isotopic analysis of strongly peraluminous granites and gabbro-diorites in the Xilinhot micro-continent".GEOSCIENCE FRONTIERS 12.3(2021). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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