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Palaeoarchaean materials in the Tibetan Plateau indicated by zircon

文献类型：期刊论文

作者Sun, Saijun1; Ireland, Trevor R.2; Zhang, Lipeng3; Zhang, Rongqing1; Zhang, Chanchan1,6; Sun, Weidong3,4,5
刊名INTERNATIONAL GEOLOGY REVIEW
出版日期2018
卷号60期号:8页码:1061-1072
关键词Palaeoarchaean materials Palaeoarchaean zircons Lhasa Terrane Zircon Hf-O isotopes
ISSN号0020-6814
DOI10.1080/00206814.2017.1367967
通讯作者Sun, Weidong(weidongsun@gig.ac.cn)
英文摘要The early tectonic evolution of the Lhasa Terrane remains poorly understood, although evidence for a substantial prehistory has been reported recently. We have carried out in situ zircon U-Pb dating and Hf-O isotopes of late Early Cretaceous monzogranites and get a surprising package of inherited zircons, not only because of their age profile, but also because the oldest Palaeoarchaean zircons are euhedral. The discovery of Palaeoarchaean euhedral zircons in the region suggests the presence of extremely old rocks in Tibet. Zircons from the Nagqu monzogranite yield five age peaks at similar to 3.45Ga, similar to 2.56Ga, similar to 1.76Ga, similar to 900Ma, and similar to 111Ma. They have large variations in epsilon(Hf)(t) values (-45.1-9.2) and old Hf model ages (924-3935Ma), with variable O-18 values of -5.80-9.64. Palaeoarchaean zircons (similar to 3.20-3.45Ga) are euhedral with magmatic zircon characteristics. One of the grains has negative epsilon(Hf)(t) value (-4.8), old Hf model age (3935Ma), and high positive O-18 value (7.27), which suggests an ancient crustal origin. The source of Palaeoarchaean euhedral zircons should be proximal to prevent long-distance transport and abrasion, whereas the late Early Cretaceous monzogranites are I-type. Thus, Palaeoarchaean euhedral zircons are most likely captured from the country rocks by assimilation at depth or may be relics of previous magmatic zircons. Notwithstanding their exact history, Palaeoarchaean euhedral zircons indicate Palaeoarchaean materials near Nagqu in the Tibetan Plateau. The inherited zircons also experienced a Late Palaeoproterozoic event (similar to 1.76Ga) likely related to the evolution of the India block. The peak at similar to 900Ma suggests affinity to the Qiangtang and Himalaya blocks.
资助项目DREAM project of MOST China[2016YFC0600408] ; NSFC[91328204] ; Chinese Academy of Sciences[2015VEA003]
WOS研究方向Geology
语种英语
WOS记录号WOS:000430094900007
出版者TAYLOR & FRANCIS INC
源URL[http://ir.qdio.ac.cn/handle/337002/158711]  
专题海洋研究所_深海极端环境与生命过程研究中心
通讯作者Sun, Weidong
作者单位1.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangzhou, Guangdong, Peoples R China
2.Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT, Australia
3.Chinese Acad Sci, Inst Oceanog, Ctr Deep Sea Res, Qingdao 266071, Peoples R China
4.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao, Peoples R China
5.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China
6.Univ Chinese Acad Sci, Sch Earth Sci, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Sun, Saijun,Ireland, Trevor R.,Zhang, Lipeng,et al. Palaeoarchaean materials in the Tibetan Plateau indicated by zircon[J]. INTERNATIONAL GEOLOGY REVIEW,2018,60(8):1061-1072.
APA Sun, Saijun,Ireland, Trevor R.,Zhang, Lipeng,Zhang, Rongqing,Zhang, Chanchan,&Sun, Weidong.(2018).Palaeoarchaean materials in the Tibetan Plateau indicated by zircon.INTERNATIONAL GEOLOGY REVIEW,60(8),1061-1072.
MLA Sun, Saijun,et al."Palaeoarchaean materials in the Tibetan Plateau indicated by zircon".INTERNATIONAL GEOLOGY REVIEW 60.8(2018):1061-1072.

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来源：海洋研究所

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