U-Pb isotopes and trace elements of columbite and zircon from an early Cretaceous

Publisher's copyright statement: NOTICE: this is the author's version of a work that was accepted for publication in Chemical Geology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be re ected in this document. Changes may have been made to this work since it was submitted for publication. A de nitive version was subsequently published in Chemical Geology, 344, 19 April 2013, 10.1016/j.chemgeo.2013.02.014.

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