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《Chinese Science Bulletin》 2015-01
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Ca.3.06 Ga granodioritic gneiss in Dunhuang block

ZHAO Yan;DIWU ChunRong;AO WenHao;WANG HongLiang;ZHU Tao;SUN Yong;State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University;Xi'an Center of Geological Survey;  
We analyze gneisses from the Dongbatu Mountain, Gangou area, which is part of the Dunhuang block. Petrographic and geochemical data show that these rocks are granodiorite with Archean tonalite-trondhjemite-granodiorite(TTG) characteristics. Zircon U-Pb dating yielded an age of ca. 3.06 Ga(Mesoarchean) for zircon cores, making these rocks the oldest yet discovered in the Dunhuang area. The ages of ca. 1.9–1.86 Ga for the zircon rim indicate a late Paleoproterozoic tectonothermal event. Hf isotopic compositions for the zircon cores show that two spots have positive εHf(t) values of 5.6 and 1.2, respectively, corresponding to two-stage Hf model ages of 3091 Ma and 3356 Ma; other samples have negative εHf(t) values of-9.4 to-0.5 and correspond to two-stage Hf model ages of 4.00–3.45 Ga, with a peak age of ca. 3.82 Ga. This indicates that the ca.3.06 Ga granodioritic gneisses were produced by reworking ancient continental crust with added juvenile crust, and that the early continental crust in the Dunhuang area began forming in the Eoarchean era(3.80–4.00 Ga). Therefore, these factors, combined with the relational evidence obtained from the Tarim Craton and the North China Craton, indicate that the Milan Complex is not the same tectonic rock unit as the Dunhuang Complex and the Milan Complex does not belong to the Dunhuang block; The Dunhuang block may be part of the North China Craton rather than the Tarim Craton.
【Fund】: 中国地质调查局项目(1212011121137);; 西北大学大陆动力学国家重点实验室科技部专项资助
【CateGory Index】: P588.345
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