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| DOI | 10.1016/j.lithos.2023.107276 |
| Recycling of subducted Indian continental crust constrained by late Cretaceous mafic dykes in Central Lhasa block of the Tibetan plateau | |
| Hao, Lu-Lu; Kerr, Andrew C.; Wang, Qiang; Ma, Lin; Qi, Yue; Xiao, Ming; Ou, Quan | |
| 发表日期 | 2023 |
| ISSN | 0024-4937 |
| EISSN | 1872-6143 |
| 卷号 | 454 |
| 英文摘要 | The question of whether subducted continental crust can be recycled into post-collisional magmatism in continental collisional zones remains controversial. Post-collisional mantle-derived ultrapotassic rocks are widespread in western part of central Lhasa block (WCL) of the Tibet-Himalaya orogen and show arc-type trace-element signatures and very enriched Sr-Nd isotopes, which have been explained by the recycling of subducted Indian continental crust. However, due to the lack of late Cretaceous mafic magmatism in the WCL, the nature of the ancient subcontinental lithospheric mantle (SCLM) beneath the WCL has not been well constrained. It is therefore still unclear whether the enriched components of these ultrapotassic rocks were derived from subducted Indian continental crust or inherited from the ancient SCLM. Here we report the mafic dykes from the TangraYumco area in the WCL, which formed at similar to 90 Ma (whole-rock Ar-40-Ar-39, and zircon and titanite U-Pb ages). The diabase-porphyrites and diorite-porphyrites are similar to intraplate Nb-enriched basalts and magnesium adakitic rocks, respectively. This rock association reveals the lithospheric foundering process. Furthermore, the diabase-porphyrites generated by the interaction between the ancient SCLM and asthenosphere provide important constraints on the nature of the ancient SCLM, which shows distinct Nd isotopes to the postcollisional ultrapotassic rocks. In addition, the NW Lhasa block was in a rear-arc environment since the late Cretaceous and thus this SCLM was not significantly influenced by the ongoing northward subduction of the Indus-YarlungZangbu Neo-Tethys ocean. Finally, we propose that the post-collisional ultrapotassic rocks cannot be sourced from the ancient SCLM, but instead were derived from a relatively depleted mantle (e.g., juvenile lithospheric mantle) metasomatized by subducted Indian continental crust. Thus, this study confirms the recycling of subducted continental materials in continental collisional orogens. |
| 关键词 | Lithosphere-asthenosphere interactionLate Cretaceous mafic dykesAdakitic rocksTibetan plateauIndian continental subductionCrustal recycling |
| 英文关键词 | SOUTHERN TIBET; ULTRAPOTASSIC ROCKS; TECTONIC EVOLUTION; INTRUSIVE ROCKS; NEOTETHYAN SLAB; MANTLE; MAGMATISM; COLLISION; BENEATH; AREA |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| WOS记录号 | WOS:001046885000001 |
| 来源期刊 | LITHOS
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/283638 |
| 作者单位 | Chinese Academy of Sciences; Guangzhou Institute of Geochemistry, CAS; Chinese Academy of Sciences; Cardiff University; Chengdu University of Technology |
| 推荐引用方式 GB/T 7714 | Hao, Lu-Lu,Kerr, Andrew C.,Wang, Qiang,et al. Recycling of subducted Indian continental crust constrained by late Cretaceous mafic dykes in Central Lhasa block of the Tibetan plateau[J],2023,454. |
| APA | Hao, Lu-Lu.,Kerr, Andrew C..,Wang, Qiang.,Ma, Lin.,Qi, Yue.,...&Ou, Quan.(2023).Recycling of subducted Indian continental crust constrained by late Cretaceous mafic dykes in Central Lhasa block of the Tibetan plateau.LITHOS,454. |
| MLA | Hao, Lu-Lu,et al."Recycling of subducted Indian continental crust constrained by late Cretaceous mafic dykes in Central Lhasa block of the Tibetan plateau".LITHOS 454(2023). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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