Add to Favorite Get Latest Update. The SHRIMP U-Pb age dating results of zircons obtained for the first time from biotite granite of Boroo complex in the Boroo large-size gold orefield suggest that this region experienced the late Paleozoic tectono-magmatic activity. Two groups of ages were obtained,i. In comparison with the A-type granite,their average chemical compositions are similar to each other;nevertheless,the average chemical composition of Boroo biotite granite is obviously different from that of S-type granite and standard granite. REE distribution patterns demonstrate a significant negative Eu anomaly and a "swallow-type" shape.
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Stuart J. Brown, Ian R. Geology ; 27 11 : — The Whakamaru group ignimbrites are products of one of the largest caldera-forming eruptions from the central Taupo Volcanic Zone, New Zealand, ca. Imaging of zircons separated from low-silica rhyolite pumice from Whakamaru group ignimbrite reveals a complex magmatic crystallization history; some grains contain resorbed cores. Cores and rims of individual zircons were dated using the sensitive high-resolution ion microprobe. The data are consistent with a prolonged evolution of the magma system over hundreds of thousands of years, involving magma replenishment and mixing with residual phases of older silicic magma chambers, in addition to crystal fractionation processes, prior to eruption.
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Such a sophisticated ion probe, which can attain a high sensitivity at a high mass resolution, based on a double focusing high mass-resolution spectrometer, designed by Matsuda , was constructed at the Australian National University. Since its installation, our focus has been on the in-situ U—Pb dating of the mineral apatite, as well as zircon, which is a more common U-bearing mineral. In this paper, we review the methodology associated with in-situ apatite dating and our contribution to Earth and Planetary Science over the past 16 years. Since the monumental studies reported in , 1 an enormous amount of work related to the Pb—Pb dating of meteorites has been reported via the use of TIMS Thermal Ionization Mass Spectrometry. After this, following cleaning with ethanol, to minimize surface contaminating Pb, the thin section was gold-coated to prevent a charge from developing on the sample surface during SHRIMP analyses.