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Mantle metasomatism by subducted Indian continental crust: Evidence from post-collisional basaltic ultrapotassic rocks in southern Tibetan plateau

文献类型：期刊论文

作者Zhang, Miao-Yan3,4; Hao, Lu-Lu4; Qi, Yue4; Wang, Qiang2,4; Kerr, Andrew C.1; Ma, Lin4; Huang, Cheng-Cheng4; Wei, Gang-Jian4; Li, Jie4; Ma, Jin-Long4
刊名LITHOS
出版日期2025-04-01
卷号498页码:11
关键词Mo - B isotopes Post-collisional ultrapotassic rocks Continental crust recycling Crust-mantle interaction Tibetan Plateau
ISSN号0024-4937
DOI10.1016/j.lithos.2025.107966
英文摘要At continental collisional zones, the continental crust is known to subduct, penetrating the deep lithospheric mantle and undergoing partial melting. However, the extent to which these melts can effectively alter, or metasomatize, the overlying mantle remains a contentious issue. This debate is especially pronounced in the Cenozoic Himalayan-southern Tibet collisional orogen. The complexity arises from the fact that previous research has predominantly concentrated on the post-collisional intermediate ultrapotassic rocks. However, these rocks could have originated either from the subducted Indian continental crust through a process of mantle assimilation or from melange rocks, thereby primarily reflecting crustal recycling rather than mantle metasomatism by subducted continental crust. In this study, we shift our focus to the less-well-studied post-collisional basaltic ultrapotassic rocks (BUPRs) from the Sailipu region in the Lhasa block of southern Tibet. Our aim is to evaluate the characteristics of the orogenic mantle and the dynamics of crust-mantle interactions. In this study we report major and trace elements and Sr-Nd-Pb-Mo-B isotopes for these Miocene post-collisional BUPRs. The rocks are typically characterized by alkaline affinity, arc-like trace element distribution patterns, and enriched Sr-Nd-Pb isotopes, which point to their derivation from an enriched mantle source. Moreover, the Mo-B isotope ratios of these BUPRs - delta 98/95Mo ranging from -0.85 %o to -0.27 %o and delta 11B from -20.2 %o to -14.4 %o - are notably lower than those found in Mid-Ocean Ridge Basalts (MORBs) and arc lavas. Instead, they are similar to the isotopic compositions of basalts associated with continental subduction, as well as intermediate ultrapotassic rocks from western Anatolia and the Lhasa block, and the gneisses and schists of the Himalayas. These similarities strongly suggest the input of subducted Indian continental crust to the mantle source for these rocks. In conclusion, our study supports the metasomatism of the mantle beneath southern Tibet by subducted Indian continental crust. These results show that continental subduction zones, much like their oceanic counterparts, are key regions for mantle metasomatism, and thus expands our understanding of the geological processes at work in these dynamic areas.
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:001424762900001
源URL[http://ir.gig.ac.cn/handle/344008/82675]  
专题同位素地球化学国家重点实验室
通讯作者Hao, Lu-Lu; Qi, Yue
作者单位1.Cardiff Univ, Sch Earth & Environm Sci, Cardiff CF10 3AT, Wales
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China
3.Minist Nat Resources, Henan Prov Rock & Mineral Testing Ctr, Key Lab Precious Met Anal & Explorat Technol, Zhengzhou 450012, Peoples R China
4.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Deep Earth Proc & Resources, Guangzhou 510640, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Miao-Yan,Hao, Lu-Lu,Qi, Yue,et al. Mantle metasomatism by subducted Indian continental crust: Evidence from post-collisional basaltic ultrapotassic rocks in southern Tibetan plateau[J]. LITHOS,2025,498:11.
APA Zhang, Miao-Yan.,Hao, Lu-Lu.,Qi, Yue.,Wang, Qiang.,Kerr, Andrew C..,...&Yang, Yu-Chen.(2025).Mantle metasomatism by subducted Indian continental crust: Evidence from post-collisional basaltic ultrapotassic rocks in southern Tibetan plateau.LITHOS,498,11.
MLA Zhang, Miao-Yan,et al."Mantle metasomatism by subducted Indian continental crust: Evidence from post-collisional basaltic ultrapotassic rocks in southern Tibetan plateau".LITHOS 498(2025):11.

入库方式： OAI收割

来源：广州地球化学研究所

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