Zircon U-Pb dating of basement gneisses in the super-large Bayan Obo REE-Fe-Nb deposit,Inner Mongolia
【摘要】:正Zircon U-Pb ages have been determined for hasement gneisses in the Bayn Obo REE-Fe-Nb deposit.On the U-Pb Concordia diagram data of three samples yield upper intercept ages of 1948-1917 Ma,thus,these basement gneisses are of Paleoproterozoic.Rock association of these basement gneisses includes tonalite,syenite and paragneiss,not belonging to a sedimentary package.It is more appropriate to consider this association as a basement complex rather than a stratigraphic Group.
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