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Nature and origin of the Wenquan granite:Implications for the provenance of Proterozoic A-type granites in the North China craton

【摘要】:正The Proterozoic Wenquan granite occurs at the northern margin of the North China craton.New U-Pb zircon ages reveal that the Wenquan granite was emplaced at 1697±7 Ma,and is thus approximately coeval with the 1753±23 Ma Changsaoying granite and the 1683±4 Ma Shachang granite found in the area.The ubiquitous occurrence of titanite and magnetite demonstrates that the granites are oxidized. Geochemically,they show most of the characteristics of typical A-type granites,such as high contents of alkalis(i.e.,high K_2O + Na_2O,with K_2O/Na_2O 1),Rb,Y,Nb and rare earth elements(REE,except for Eu),high FeO_t/MgO and Ga/Al ratios and low contents of CaO,A1_2O_3,and Sr.Their negative bulk rock initial Nd and zircon initial Hf isotopic ratios suggest that they were most likely derived from the late Archean lower crust.The three Proterozoic A-type granites are believed to be genetically related to the breakup of the Columbia supercontinent.

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