Institutional Repository of State Key Laboratory of Lithospheric Evolution
| Refertilization of lithospheric mantle beneath the North China Craton in Mesozoic: Evidence from in situ Sr isotopes of Fuxin peridotite | |
| Zou, Dongya1; Zhang, Hongfu1; Zhang, Xiaoqi1; Zhang, Huiting1,2; Su, Benxun3 | |
| 2020-07-01 | |
| Source Publication | LITHOS
 |
| ISSN | 0024-4937 |
| Volume | 364Pages:13 |
| Abstract | The Mesozoic was a critical period for the evolution of the North China Craton (NCC). We present the petrological observations and in situ mineral major and trace elements and Sr isotopic data for spinet harzburgite and Iherzolite xenoliths in Late Cretaceous Fuxin basalts from the northern margin of the NCC. These data are used to investigate the nature and evolution of the subcontinental lithospheric mantle (SCLM) beneath the NCC during the Mesozoic. The peridotite xenoliths commonly have porphyroclastic and granoblastic textures, and can be divided into high-Mg# and low-Mg# peridotites. Compared with the low-Mg# peridotites, the high-Mg# peridotites have higher olivine Fo (>91) and spinel Cr# values (>35), and their dinopyroxenes are light REE-enriched with uniform Sr-87/(86) Sr ratios (ca. 0.7042). These observations suggest that the high-Mg# peridotites could be relics of old SCLM and were metasomatized by melts derived from subducted Paleo-Asian oceanic slab. The low-Mg# peridotites are characterized by minerals with sieve textures and melt pockets. The olivine Fo of the low-Mg# peridotites are low and variable (81.2-90.4), and decrease from core to rim in some crystals. Thus, the low-Mg# peridotites underwent extensive peridotite-melt interactions. Their dinopyroxenes are enriched in LREE and show large variations in the Sr-87/Sr-86 ratios (0.7039-0.7052). Moreover, Sr-87/Sr-86 ratios positively correlate with MgO and negatively correlate with Al2O3, Eu and Dy contents. These observations suggest that the low-Mg# peridotites experienced multiple stages of mantle metasomatism, involving high Sr-87/Sr-86 melts derived from the subducted Paleo-Asian oceanic crust in early stage and low Sr-87/Sr-86 melts derived from more recent asthenospheric u pwelling. Therefore, the low-Mg# peridotites are representative of SCLM fragments that were strongly modified beneath the Fuxin region during the Late Cretaceous. Combined with previous studies, our findings suggest that refertilization of the SCLM by asthenospheric melts beneath the northern margin of the NCC commenced before eruption of the Fuxin basalts (ca. 100 Ma), which is much earlier than previously thought. This process resulted in a highly heterogeneous SCLM. In addition, the Tan-Lu Fault contributed substantially to the evolution of the SCLM beneath the NCC during the Mesozoic. (C) 2020 Published by Elsevier B.V. |
| Keyword | Peridotite xenolith In situ Sr isotopes Refertilization of SCLM Asthenospheric upwelling Mesozoic SCLM evolution |
| DOI | 10.1016/j.lithos.2020.105478 |
| Funding Organization | National Natural Science Foundation 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 ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China |
| WOS Keyword | SINO-KOREAN CRATON ; LU FAULT ZONE ; TRACE-ELEMENT ; EASTERN CHINA ; ULTRAMAFIC XENOLITHS ; SHANDONG PROVINCE ; OCEANIC-CRUST ; EXPERIMENTAL CONSTRAINTS ; MELT PERCOLATION ; CENOZOIC BASALTS |
| Language | 英语 |
| Funding Project | National Natural Science Foundation of China[41688103] ; National Natural Science Foundation of China[91755205] |
| Funding Organization | National Natural Science Foundation 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 ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China |
| WOS Research Area | Geochemistry & Geophysics ; Mineralogy |
| WOS Subject | Geochemistry & Geophysics ; Mineralogy |
| WOS ID | WOS:000536183500001 |
| Publisher | ELSEVIER |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.iggcas.ac.cn/handle/132A11/96671 |
| Collection | 岩石圈演化国家重点实验室 |
| Corresponding Author | Zhang, Hongfu |
| Affiliation | 1.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China 2.Xian Univ Sci & Technol, Coll Geol & Environm, Xian 710054, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China |
| Recommended Citation GB/T 7714 | Zou, Dongya,Zhang, Hongfu,Zhang, Xiaoqi,et al. Refertilization of lithospheric mantle beneath the North China Craton in Mesozoic: Evidence from in situ Sr isotopes of Fuxin peridotite[J]. LITHOS,2020,364:13. |
| APA | Zou, Dongya,Zhang, Hongfu,Zhang, Xiaoqi,Zhang, Huiting,&Su, Benxun.(2020).Refertilization of lithospheric mantle beneath the North China Craton in Mesozoic: Evidence from in situ Sr isotopes of Fuxin peridotite.LITHOS,364,13. |
| MLA | Zou, Dongya,et al."Refertilization of lithospheric mantle beneath the North China Craton in Mesozoic: Evidence from in situ Sr isotopes of Fuxin peridotite".LITHOS 364(2020):13. |
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