Early Cretaceous magmatic flare-up in the northern-central Tibetan Plateau: Products of low-angle bidirectional subduction and slab sinking of the Bangong-Nujiang Tethys Ocean
文献类型：期刊论文
| 作者 | Yang, Xingchen5,6; Zhao, Yuanfang5,6; Cai, Maotang5,6; Ji, Fengbao1; Meng, Lingtong3,4; Zhou, Qiuyu5,6; Zhou, Yuanjian5,6; Pei, Yingru5,6; Yuan, Changjiang2 |
| 刊名 | GONDWANA RESEARCH
 |
| 出版日期 | 2026-03-01 |
| 卷号 | 151页码:131-152 |
| 关键词 | Tibetan Plateau Bangong-Nujiang Tethys Ocean Early Cretaceous Post-collisional magmatism Magmatic flare-up |
| ISSN号 | 1342-937X |
| DOI | 10.1016/j.gr.2025.10.013 |
| 产权排序 | 2 |
| 文献子类 | Article |
| 英文摘要 | The Bangong-Nujiang suture zone (BNSZ), separating the Qiangtang and Lhasa blocks, exhibits extensive Early Cretaceous varied magmatism and significant metallogenetic potential. However, geodynamic mechanisms driving this magmatic flare-up remain controversial. To address this issue, we conducted a comprehensive study focusing on the multi-type intrusions within and adjacent to the melange zone in the Amdo-Nagqu area, middle BNSZ. Zircon U-Pb dating indicates that these intrusions emplaced during the Early Cretaceous (119-109 Ma). They display consistent arc-like whole-rock major and trace element characteristics with highly variable wholerock initial 87Sr/86Sr (0.706534-0.712838) ratios, negative epsilon Nd(t) (-3.7 to - 9.2) values, and negative to weakly positive zircon epsilon Hf(t) (-14.7 to + 2.0) values. These geochemical features suggest their petrogenesis involved crust-mantle interactions. Furthermore, the mafic samples are characterized by narrow-ranging 143Nd/144Nd ratios but a wide range of Hf/Nd ratios, and a broader variation of zircon delta 18O values (8.9-15.5 %o) compared with coeval felsic samples (7.8-9.8 %o), indicating the involvement of subducted sediments in the mantle source. Based on the new and previously published data, we suggest that the mafic intrusions originated from partial melting of the sediment-dominated melange in the sub-continental lithospheric mantle (SCLM), providing tangible evidence of the southward oceanic subduction. In contrast, the felsic intrusions formed through partial melting of the continental crust within hot zones, accompanied by varying degrees of mantle-derived magma mixing. We propose the following geodynamic model for the widespread, small-volume, compositionally diverse Early Cretaceous magmatism along the BNSZ: Demise of the Bangong-Nujiang Tethys Ocean via low-angle bidirectional subduction during the Early Cretaceous, followed by extensive and contemporaneous partial melting. This process was triggered by the decompression and hot asthenosphere upwelling through corner flow and local sporadic slab windows within the fractured zones, along with sinking of the eclogitized ocean slab. |
| URL标识 | 查看原文 |
| WOS关键词 | HIGH-MG ANDESITES ; A-TYPE GRANITES ; TECTONIC EVOLUTION ; LHASA TERRANE ; RIDGE SUBDUCTION ; MELANGE DIAPIRS ; SUTURE ZONE ; EXPERIMENTAL CONSTRAINTS ; METAMORPHIC COMPLEX ; QIANGTANG TERRANE |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001630922800001 |
| 出版者 | ELSEVIER |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/219762]  |
| 专题 | 陆地表层格局与模拟院重点实验室_外文论文 |
| 通讯作者 | Ji, Fengbao |
| 作者单位 | 1.Xizang Museum Nat Sci, 9 Zangda East Rd, Lhasa 850000, Peoples R China; 2.China Univ Geosci Beijing, Sch Earth Sci & Resources, Beijing 100083, 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, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China; 5.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Land Surface Pattern & Simulat, Beijing 100101, Peoples R China; 6.Chinese Acad Geol Sci, Inst Geomech, Beijing 100081, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Yang, Xingchen,Zhao, Yuanfang,Cai, Maotang,et al. Early Cretaceous magmatic flare-up in the northern-central Tibetan Plateau: Products of low-angle bidirectional subduction and slab sinking of the Bangong-Nujiang Tethys Ocean[J]. GONDWANA RESEARCH,2026,151:131-152. |
| APA | Yang, Xingchen.,Zhao, Yuanfang.,Cai, Maotang.,Ji, Fengbao.,Meng, Lingtong.,...&Yuan, Changjiang.(2026).Early Cretaceous magmatic flare-up in the northern-central Tibetan Plateau: Products of low-angle bidirectional subduction and slab sinking of the Bangong-Nujiang Tethys Ocean.GONDWANA RESEARCH,151,131-152. |
| MLA | Yang, Xingchen,et al."Early Cretaceous magmatic flare-up in the northern-central Tibetan Plateau: Products of low-angle bidirectional subduction and slab sinking of the Bangong-Nujiang Tethys Ocean".GONDWANA RESEARCH 151(2026):131-152. |
入库方式： OAI收割
来源：地理科学与资源研究所
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