The oldest basement rock in the Yangtze Craton revealed by zircon U-Pb age and Hf isotope composition

Here we report an integrated study of zircon U-Pb age and Hf isotope composition for a gneiss sample from the Kongling terrain in the Yangtze Craton. CL imaging reveals that most zircons are magmatic, and a few of them have thin metamorphic rims. The magmatic zircons gave a weighted mean U-Pb age of...

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Bibliographic Details
Published in:Science China. Earth sciences 2009-09, Vol.52 (9), p.1393-1399
Main Authors: Jiao, WenFang, Wu, YuanBao, Yang, SaiHong, Peng, Min, Wang, Jing
Format: Article
Language:English
Subjects:
age
basement
composition
Earth and Environmental Science
Earth Sciences
Geochemistry
isotope
Isotopes
Kongling
Magma
oldest
Plate tectonics
rock
Rocks
U-Pb
zircon
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Summary:Here we report an integrated study of zircon U-Pb age and Hf isotope composition for a gneiss sample from the Kongling terrain in the Yangtze Craton. CL imaging reveals that most zircons are magmatic, and a few of them have thin metamorphic rims. The magmatic zircons gave a weighted mean U-Pb age of 3218±13 Ma, indicating the gneiss is the oldest basement rock in the Yangtze Craton found to date. They have εHf(t) value of -2.33±0.51,and two-stage Hf model age of 3679±49 Ma,indicating that the gneiss was derived from partial melting of >3.6 Ga crustal rock. The metamorphic rims yielded an age of 2732±16 Ma, implying that the metamorphic event occurred in the Neoarchean era, which may be also a major tectono-thermal event in the Yangtze Craton.
ISSN:1674-7313
1006-9313
1869-1897
1862-2801
DOI:10.1007/s11430-009-0135-7