Palaeoarchaean materials in the Tibetan Plateau indicated by zircon

doi:10.1080/00206814.2017.1367967

IOCAS-IR

	Palaeoarchaean materials in the Tibetan Plateau indicated by zircon
	Sun, Saijun 1; Ireland, Trevor R.2; Zhang, Lipeng 3; Zhang, Rongqing 1; Zhang, Chanchan 1,6; Sun, Weidong 3,4,5
	2018
发表期刊	INTERNATIONAL GEOLOGY REVIEW
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.