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Cenozoic mantle composition evolution of southern Tibet indicated by Paleocene (similar to 64 Ma) pseudoleucite phonolitic rocks in central Lhasa terrane

文献类型：期刊论文

作者Qi, Yue1,2; Gou, Guo-Ning1,2; Wang, Qiang1,2,3; Wyman, Derek A.4; Jiang, Zi-Qi1,5; Li, Qi-Li6; Zhang, Le1
刊名LITHOS
出版日期2018-03-01
卷号302页码:178-188
关键词Apatite U-pb Dating Ultrapotassic Rocks Neo-tethyan Ocean Continental Subduction Tibet
ISSN号0024-4937
DOI10.1016/j.lithos.2017.12.021
文献子类Article
英文摘要The question of whether continental subduction processes in collisional orogenic belts can trigger wide-spread mantle metesomatism and crustal material recycling remains unresolved. Miocene (25-8 Ma) ultrapotassic rocks in southern Tibet are the only mantle-derived magmatic rocks emplaced after the collision between India and Asia and they have been linked to the onset of east-west extensional stresses as the surface uplift of the Tibetan Plateau reached near-maximum elevation. However, their petrogenesis remains highly controversial, particularly the issue of whether their extremely enriched Sr-Nd isotopic characteristics were related to metasomatism derived from subducted Indian continental materials during the Cenozoic. Here we report on a Paleocene silicate-unsaturated, pseudoleucite phonolitic dike, in the Rongniduo area of central Lhasa terrane. In-situ SIMS (secondary ion mass spectrometry) apatite U-Pb age indicates the dike was generated at 64.1 +/- 4.2 Ma, which slightly predates the age of initial India and Asia collision (about 55-50 Ma). This is the oldest age yet reported for ultrapotassic rocks in southern Tibet. Samples from this dike have distinctly more depleted Sr-Nd (whole rock: (Sr-87/Sr-86)(i) = 0.7064 to 0.7062, epsilon Nd(t) = -1.5 to 0.4; in situ apitite: (Sr-87/Sr-86)(i) = 0.7059 to 0.7060, epsilon Nd(t) = -2.0 to 0.4) isotopic compositions, than those of Miocene (25-8 Ma) ultrapotassic rocks in the central Lhasa terrane ((Sr-87/Sr-86)(i) = 0.7106 to 0.7399, epsilon Nd(t) = -10.6 to -18.5). Our new data provides important constraints on pre-collisional mantle characteristics beneath the Lhasa terrane. We suggest that these similar to 64 Ma pseudoleucite phonolitic rocks were derived from the enriched lithospheric mantle metasomatized by subducted Tethyan oceanic materials in response to Neo-Tethyan slab roll-back. As a consequence, the younger Miocene ultrapotassic rocks, which display different geochemical compositions from the pre-collisional ultrapotassic rocks, were most probably derived from a mantle source metasomatized by subducted Indian continental materials after similar to 64 Ma. Our results indicate that the addition of subducted continental components plays an important role in changing mantle constituents beneath collisional orogenic belts. (C) 2017 Elsevier B.V. All rights reserved.
WOS关键词CONTINENTAL LITHOSPHERIC MANTLE ; INDIA-ASIA COLLISION ; U-PB AGE ; ULTRAPOTASSIC ROCKS ; VOLCANIC-ROCKS ; ISOTOPIC CONSTRAINTS ; POTASSIC MAGMATISM ; PARTITION-COEFFICIENTS ; ZR/HF FRACTIONATION ; WORKING REFERENCE
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000428497500011
出版者ELSEVIER SCIENCE BV
资助机构Key Program of the Chinese Academy of Sciences(QYZDJ-SSW-DQC026) ; Key Program of the Chinese Academy of Sciences(QYZDJ-SSW-DQC026) ; National Key R & D Program of China(2016YFC0600407 ; National Key R & D Program of China(2016YFC0600407 ; National Natural Science Foundation of China(41630208) ; National Natural Science Foundation of China(41630208) ; Talent Project of Guangdong Province(2014TX01Z079) ; Talent Project of Guangdong Province(2014TX01Z079) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 Project)(135TP201601) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 Project)(135TP201601) ; 2016YFC0600309) ; 2016YFC0600309) ; Key Program of the Chinese Academy of Sciences(QYZDJ-SSW-DQC026) ; Key Program of the Chinese Academy of Sciences(QYZDJ-SSW-DQC026) ; National Key R & D Program of China(2016YFC0600407 ; National Key R & D Program of China(2016YFC0600407 ; National Natural Science Foundation of China(41630208) ; National Natural Science Foundation of China(41630208) ; Talent Project of Guangdong Province(2014TX01Z079) ; Talent Project of Guangdong Province(2014TX01Z079) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 Project)(135TP201601) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 Project)(135TP201601) ; 2016YFC0600309) ; 2016YFC0600309) ; Key Program of the Chinese Academy of Sciences(QYZDJ-SSW-DQC026) ; Key Program of the Chinese Academy of Sciences(QYZDJ-SSW-DQC026) ; National Key R & D Program of China(2016YFC0600407 ; National Key R & D Program of China(2016YFC0600407 ; National Natural Science Foundation of China(41630208) ; National Natural Science Foundation of China(41630208) ; Talent Project of Guangdong Province(2014TX01Z079) ; Talent Project of Guangdong Province(2014TX01Z079) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 Project)(135TP201601) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 Project)(135TP201601) ; 2016YFC0600309) ; 2016YFC0600309) ; Key Program of the Chinese Academy of Sciences(QYZDJ-SSW-DQC026) ; Key Program of the Chinese Academy of Sciences(QYZDJ-SSW-DQC026) ; National Key R & D Program of China(2016YFC0600407 ; National Key R & D Program of China(2016YFC0600407 ; National Natural Science Foundation of China(41630208) ; National Natural Science Foundation of China(41630208) ; Talent Project of Guangdong Province(2014TX01Z079) ; Talent Project of Guangdong Province(2014TX01Z079) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 Project)(135TP201601) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 Project)(135TP201601) ; 2016YFC0600309) ; 2016YFC0600309)
源URL[http://ir.iggcas.ac.cn/handle/132A11/88333]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Wang, Qiang
作者单位1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China
2.Univ Chinese Acad Sci, Beijing 10069, Peoples R China
3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 10010, Peoples R China
4.Univ Sydney, Sch Geosci, Sydney, NSW 2006, Australia
5.Guilin Univ Technol, Sch Earth Sci, Guilin 541004, Peoples R China
6.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Qi, Yue,Gou, Guo-Ning,Wang, Qiang,et al. Cenozoic mantle composition evolution of southern Tibet indicated by Paleocene (similar to 64 Ma) pseudoleucite phonolitic rocks in central Lhasa terrane[J]. LITHOS,2018,302:178-188.
APA Qi, Yue.,Gou, Guo-Ning.,Wang, Qiang.,Wyman, Derek A..,Jiang, Zi-Qi.,...&Zhang, Le.(2018).Cenozoic mantle composition evolution of southern Tibet indicated by Paleocene (similar to 64 Ma) pseudoleucite phonolitic rocks in central Lhasa terrane.LITHOS,302,178-188.
MLA Qi, Yue,et al."Cenozoic mantle composition evolution of southern Tibet indicated by Paleocene (similar to 64 Ma) pseudoleucite phonolitic rocks in central Lhasa terrane".LITHOS 302(2018):178-188.

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