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Title of Journal: Sci China Earth Sci

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Abbravation: Science China Earth Sciences

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Science China Press

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DOI

10.1007/bf00557844

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1869-1897

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NanoSIMS imaging method of zircon UPb dating

Authors: Sen Hu YangTing Lin Wei Yang WeiRZ Wang JianChao Zhang JiaLong Hao WeiFan Xing
Publish Date: 2016/09/20
Volume: 59, Issue: 11, Pages: 2155-2164
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Abstract

We report an imaging method of zircon UPb dating with NanoSIMS 50L which overcomes the significant UPb fractionation as the pit was sputtered deeper during conventional spot mode analysis and can be applied to irregular small grains or heterogeneous areas of zircon The UPb and PbPb ages can be acquired simultaneously for 2 μm×2 μm for small grains or 1 μm×9 μm for zoned grains together with Zr Y and other trace elements distributions Using zircon M257 as standard the UPb ages of other zircon standards including Qinghu Plesovice Temora and 91500 were measured to 2σ as 1588±08 3359±34 4120±12 and 1067±12 Ma respectively consistent with the recommended values within the analytical uncertainties Tiny zircon grains in the impact melt breccia of the lunar meteorite SaU 169 were also measured in this study with a PbPb age of 3912±14 Ma and a UPb age of 3917±17 Ma similar to previous results reported for the same meteorite The imaging method was also applied to determine UPb age of the thin overgrowth rims of Longtan metamorphic zircon with a PbPb age of 1933±27 Ma and a UPb age of 1935±25 Ma clearly distinct from the PbPb age of 2098±61 Ma and the UPb age of 2054±40 Ma for detrital cores

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