The role of basaltic underplating in the evolution of the lower continental crust
文献类型：期刊论文
| 作者 | Hu, Jun1,2,4; Jiang, Neng1,2,4; Guo, Jinghui1,2,4; Fan, Wenbo1,3; Liu, Danqing1,2,4 |
| 刊名 | GEOCHIMICA ET COSMOCHIMICA ACTA
 |
| 出版日期 | 2020-04-15 |
| 卷号 | 275页码:19-35 |
| 关键词 | Basaltic underplating Deep-seated xenoliths Zircon Lower continental crust North China Craton |
| ISSN号 | 0016-7037 |
| DOI | 10.1016/j.gca.2020.02.002 |
| 英文摘要 | Basaltic underplating revealed by lower crustal xenoliths is usually considered to be manifested by younger zircon ages than those of the pre-existing crust and/or Sr-Nd isotopic heterogeneity resulting from mixing between mantle-derived basaltic melts and crust. The Hannuoba mafic lower crustal xenoliths have long been regarded as a typical example of Mesozoic underplating owing to the presence of 80-160 Ma zircons and evolved Sr-Nd isotopic compositions. However, our integrated study shows that most Mesozoic zircons in the Hannuoba mafic xenoliths precipitated from partial melts derived from the ancient lower crust. Although a few young zircons may record Mesozoic underplating, none of the xenoliths are products of Mesozoic underplating. It provides the first direct evidence that some zircons in lower crustal xenoliths could be exotic. The contrasting O-Hf isotopic compositions of Mesozoic zircons from the Hannuoba lower crustal xenoliths allow us to distinguish zircons that were grown from different hydrous melts from those that represent recrystallized pre-existing zircons. This has major implications for geological interpretation of the age diversity commonly observed in deep-seated xenoliths worldwide. Furthermore, at Hannuoba both the similar to 1.8 Ga zircon ages from the granulite terrain and most of the 1.8-1.9 Ga zircon ages from a previously reported banded granulite xenolith also reflect metamorphism rather than underplating. It demonstrates that high-grade metamorphism or partial melting of Archean rocks can result in zircons with significantly younger U-Pb and TEDmHf ages. We infer that some granulite xenoliths previously regarded as products of Paleoproterozoic basaltic underplating from other regions (e.g., the Wyoming craton and the Siberian craton) may actually be remnants or derivatives of the pre-existing Archean lower crust. The large range in Sr-Nd isotopic compositions for various Hannuoba lower crustal xenoliths is unlikely to have resulted from mixing between basaltic melts and crust but was rather inherited from the ancient lower crust. Most of the Hannuoba mafic xenoliths can be best explained as residues left after partial melting of the late Archean lower crust that may be represented by the granulite terrain to produce the voluminous 125-143 Ma intermediate-felsic magmatic rocks. Therefore, young zircon ages and heterogeneous Sr-Nd isotopic compositions are insufficient criteria to infer recent underplating. Combined with literature data, it shows that Archean mafic granulite xenoliths are widespread globally, thus arguing against previous suggestion that mafic granulites from the lower crust of most Archean cratons might have formed from post-Archean basaltic underplating. It is implied that the role of basaltic underplating in the evolution of the lower crust in many regions may need to be re-evaluated. |
| WOS关键词 | NORTH CHINA CRATON ; PB ZIRCON GEOCHRONOLOGY ; MANTLE INTERACTION BENEATH ; HIGH-PRESSURE GRANULITES ; LU-HF ; ISOTOPIC CHARACTERISTICS ; PYROXENITE XENOLITHS ; LITHOSPHERIC MANTLE ; MINERAL CHEMISTRY ; HANNUOBA BASALTS |
| 资助项目 | Ministry of Science and Technology of People's Republic of China[2016YFC0600103] ; National Natural Science Foundation of China[41973034] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000520018300002 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 资助机构 | Ministry of Science and Technology of People's Republic of China ; Ministry of Science and Technology of People's Republic of China ; Ministry of Science and Technology of People's Republic of China ; Ministry of Science and Technology of People's Republic of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Ministry of Science and Technology of People's Republic of China ; Ministry of Science and Technology of People's Republic of China ; Ministry of Science and Technology of People's Republic of China ; Ministry of Science and Technology of People's Republic of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Ministry of Science and Technology of People's Republic of China ; Ministry of Science and Technology of People's Republic of China ; Ministry of Science and Technology of People's Republic of China ; Ministry of Science and Technology of People's Republic of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Ministry of Science and Technology of People's Republic of China ; Ministry of Science and Technology of People's Republic of China ; Ministry of Science and Technology of People's Republic of China ; Ministry of Science and Technology of People's Republic of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/95496]  |
| 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 | Jiang, Neng |
| 作者单位 | 1.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 3.Northwest Univ, State Key Lab Continental Dynam, Xian 710069, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Hu, Jun,Jiang, Neng,Guo, Jinghui,et al. The role of basaltic underplating in the evolution of the lower continental crust[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2020,275:19-35. |
| APA | Hu, Jun,Jiang, Neng,Guo, Jinghui,Fan, Wenbo,&Liu, Danqing.(2020).The role of basaltic underplating in the evolution of the lower continental crust.GEOCHIMICA ET COSMOCHIMICA ACTA,275,19-35. |
| MLA | Hu, Jun,et al."The role of basaltic underplating in the evolution of the lower continental crust".GEOCHIMICA ET COSMOCHIMICA ACTA 275(2020):19-35. |
入库方式： OAI收割
来源：地质与地球物理研究所
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