Knowledge Management System Of Institute of Oceanology, Chinese Academy of Sciences
Palaeoarchaean materials in the Tibetan Plateau indicated by zircon | |
Sun, Saijun1; Ireland, Trevor R.2; Zhang, Lipeng3; Zhang, Rongqing1; Zhang, Chanchan1,6; Sun, Weidong3,4,5 | |
2018 | |
发表期刊 | INTERNATIONAL GEOLOGY REVIEW
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ISSN | 0020-6814 |
卷号 | 60期号:8页码:1061-1072 |
通讯作者 | Sun, Weidong(weidongsun@gig.ac.cn) |
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. |
关键词 | Palaeoarchaean materials Palaeoarchaean zircons Lhasa Terrane Zircon Hf-O isotopes |
DOI | 10.1080/00206814.2017.1367967 |
收录类别 | SCI |
语种 | 英语 |
资助项目 | Chinese Academy of Sciences[2015VEA003] ; NSFC[91328204] ; DREAM project of MOST China[2016YFC0600408] ; DREAM project of MOST China[2016YFC0600408] ; NSFC[91328204] ; Chinese Academy of Sciences[2015VEA003] |
WOS研究方向 | Geology |
WOS类目 | Geology |
WOS记录号 | WOS:000430094900007 |
出版者 | TAYLOR & FRANCIS INC |
WOS关键词 | U-PB GEOCHRONOLOGY ; NORTH CHINA CRATON ; OXYGEN-ISOTOPE RATIOS ; LACHLAN FOLD BELT ; I-TYPE GRANITES ; DETRITAL ZIRCONS ; LHASA TERRANE ; LU-HF ; SOUTHERN TIBET ; PALEOGEOGRAPHIC IMPLICATIONS |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://ir.qdio.ac.cn/handle/337002/158710 |
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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