Identifying deep recycled carbonates through Miocene basalts in the Maguan area, SE Tibetan Plateau
Lei, Hangshan1,2,3; Zhao, Zhidan1,2; Niu, Yaoling1,2,4,5,6; Zhang, Shuangquan3; Cousens, Brian3; Ma, Qian1,2; Teng, Fang-Zhen7; Liu, Dong1,2; Miao, Zhuang1,2; Yang, Yiyun1,2; Wu, Jingkai1,2; Wang, Qing1,2; Zhu, Di-Cheng1,2
Source PublicationLITHOS
Corresponding AuthorZhao, Zhidan(
AbstractCenozoic mantle-derived magmas are widespread on the Tibetan Plateau, and provide evidence for the evolution of deep mantle and its influence on the Plateau development. Miocene basalts in the Maguan area on the southeastern Plateau have high MgO (9.13-13.10 wt%) and Mg-# (0.60-0.70) with high Ce/Pb (10.6-32.5) and Nb/U (43.7-52.9) ratios, similar to those of oceanic basalts. Distinct from Eocene-Oligocene mantle-derived potassic magmas in Western Yunnan and Cenozoic basic volcanic rocks in Tengchong, these Maguan basalts are characterized by high large ion lithophile elements (LILEs) concentrations, positive anomaly in high field strength elements (HFSEs) and depleted Sr-Nd isotopes, consistent with the melt of an asthenospheric mantle origin. The high Ce/Pb and Nb/Y (1.80-2.68) ratios together with low Ba/Y and Ba/Th ratios indicate a significant input of slab-derived melt into the asthenospheric source. Besides, Hf/Hf* and Ti/Ti* ratios are significantly lower than those of ocean island basalt (OIB), which are proportional to the lighter delta Mg-26 (-0.6 parts per thousand to -0.4 parts per thousand) values. Based on the results of experimental petrology, the Sr-Mg isotope mixing model suggests that the asthenospheric mantle beneath the Maguan area had undergone the significant metasomatism of recycled carbonates prior to the late Miocene. The above petrological and geochemical understanding, together with the geophysical data, allows us to propose that the mantle metasomatism is most probably associated with the Neo-Tethys seafloor subduction, which is further testified by the decoupling between depleted Sr-Nd isotopes and elevated LILE concentrations.
KeywordThe Tibetan Plateau Cenozoic magmatism Sr-Nd-Mg isotopes Asthenosphere Metasomatism
Indexed BySCI
Funding ProjectSecond Tibetan Plateau Scientific Expedition and Research (STEP) program[2019QZKK0702] ; National Key Research and Development Project of China[2016YFC0600304] ; Natural Science Foundation of China[41802058] ; 111 Project of the Ministry of Science and Technologyof China[B18048]
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000701184400003
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Document Type期刊论文
Corresponding AuthorZhao, Zhidan
Affiliation1.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China
2.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
3.Carleton Univ, Dept Earth Sci, Ottawa Carleton Geosci Ctr, Isotope Geochem & Geochronol Res Ctr, 1125 Colonel Dr, Ottawa, ON K1S 5B6, Canada
4.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China
5.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England
6.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China
7.Univ Washington, Dept Earth & Space Sci, Isotope Lab, Seattle, WA 98195 USA
Recommended Citation
GB/T 7714
Lei, Hangshan,Zhao, Zhidan,Niu, Yaoling,et al. Identifying deep recycled carbonates through Miocene basalts in the Maguan area, SE Tibetan Plateau[J]. LITHOS,2021,400-401:11.
APA Lei, Hangshan.,Zhao, Zhidan.,Niu, Yaoling.,Zhang, Shuangquan.,Cousens, Brian.,...&Zhu, Di-Cheng.(2021).Identifying deep recycled carbonates through Miocene basalts in the Maguan area, SE Tibetan Plateau.LITHOS,400-401,11.
MLA Lei, Hangshan,et al."Identifying deep recycled carbonates through Miocene basalts in the Maguan area, SE Tibetan Plateau".LITHOS 400-401(2021):11.
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