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SHRIMP U-Pb and CAMECA 1280 oxygen isotope results from ancient detrital zircons in the Caozhuang quartzite, Eastern Hebei, North China Craton: Evidence for crustal reworking 3.8 Ga ago

Simon A. Wilde^*,, John W. Valley^**, Noriko T. Kita^**, Aaron J. Cavosie^*** and Dunyi Liu

^* Department of Applied Geology, Curtin University of Technology, GPO Box U1987, Perth 6845, Australia
^** Department of Geology and Geophysics, University of Wisconsin, Madison, Wisconsin, 53706 USA
^*** Department of Geology, University of Puerto Rico, Mayagüez, Puerto Rico, 00681-9017 USA
Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China

Corresponding author: s.wilde{at}curtin.edu.au

The Caozhuang quartzite, located in Eastern Hebei Province in the eastern part of the North China Craton, has long been known to contain the oldest detrital zircon population in China. A suite of 30 zircons with preliminary ages >3.7 Ga were selected for detailed SHRIMP U-Pb and CAMECA 1280 oxygen isotope analyses. SHRIMP U-Pb dating reveals that ages range from 3860 to 3135 Ma, the former being the oldest ²⁰⁷Pb/²⁰⁶Pb zircon age so far obtained from the North China Craton. Values of ¹⁸O range from 5.4 to 7.5 permil, similar to Archean igneous zircons worldwide, but the average value for the 30 zircons is 6.6 permil, which is 0.3 permil higher than suite averages for detrital zircons from the Jack Hills and Beartooth Mountains and nearly 1 permil higher than magmatic zircons from igneous rocks of the Superior Province and Barberton. These elevated values of ¹⁸O suggest reworking of a significant amount of juvenile crust, older than 3.8 Ga, that underwent a low temperature supracrustal history and was distributed throughout the source region in north-east China.

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