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Paleoproterozoic crustal growth in the Western Block of the North China Craton: Evidence from detrital zircon Hf and whole rock Sr-nd isotopic compositions of the Khondalites from the Jining Complex

Xiaoping Xia^*, Min Sun^*,, Guochun Zhao^*, Fuyuan Wu^**, Ping Xu^**, Jian Zhang^* and Yanhong He^*

^* Department of Earth Sciences, the University of Hong Kong, Pokfulam Road, Hong Kong
^** Institute of Geology and Geophysics, Chinese Academy of Science, Beijing 100029, China

Corresponding author: minsun{at}hkucc.hku.hk; Fax: 852-25176912

Detrital zircons from the khondalites in the Western Block of the North China Craton were mainly derived from a 1.9 to 2.1 Ga Paleoproterozoic provenance. Most of the more than 200 detrital zircons analyzed in this study have positive initial _Hf values and a wide range of Hf depleted mantle model ages (T_DM^C) that range from 2.08 Ga to 2.74 Ga, with a peak at 2.24 to 2.40 Ga. The whole rock Nd isotopic analyses for the khondalite samples give quite uniform ¹⁴³Nd/¹⁴⁴Nd ratios from 0.511188 to 0.511858, corresponding to initial _{Nd (2.10Ga)} values ranging from -1.6 to +0.6. In contrast, Sr isotopic compositions of these samples are more varied, with initial ⁸⁷Sr/⁸⁶Sr ratios at 2.10 Ga ranging from 0.7017 to 0.7076. In the _Nd versus ⁸⁷Sr/⁸⁶Sr correlation diagram, most samples plot near the mixing hyperbola of the depeleted mantle and crust, with the contribution of depleted mantle about 65 to 75 percent. These results suggest that a large amount of juvenile materials from the depleted mantle was accreted to the Western Block at 2.1 Ga, a period of magmatic quiescence in many cratons of the world.

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				X. XIA, M. SUN, G. ZHAO, F. WU, and L. XIE U-Pb and Hf isotopic study of detrital zircons from the Luliang khondalite, North China Craton, and their tectonic implications Geological Magazine, September 1, 2009; 146(5): 701 - 716. [Abstract] [Full Text] [PDF]