SHRIMP is an analytical instrument that the Australian National University ANU has begun to develop since , and secondary ion mass spectrometry to analyze the secondary ions generated by irradiating a primary ion beam on the sample surface. SHRIMP has specialized in carrying out the analysis of minute areas by particular focused ion beam, and is referred to as “ion microprobe “. High secondary ion detection sensitivity and high mass and spatial resolution enable to produce reliable data worldwide. The secondary ion mass spectrometry is a technique of analysis in microscale of sample surface. The secondary ion, which is sputtered from sample surface by a focused ion beam primary ion beam in high vacuum, is analyzed. Therefore, it is possible to analyze sample as a solid without chemical treatment, such as sample dissolution and column separation.
Sedimentary sequences interbedded with tuff layers unconformably overlay metamorphic rocks in the Sulu Orogen.
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Jelinek I ; Artur C. Bastos-Neto I ; Jayme A. McNaughton III. These ages were obtained by U-Pb isotopic determinations with the sensitive high mass-resolution ion microprobe on igneous zircons from Pedras Grandes Suite in Santa Catarina State. Euhedral zircons remained unaltered close to a fluorite vein deposited at ? C or more. These ages suggest a northern limit for the Pedras Grandes Suite, explaining the spatial relationship between the fluorite veins and the source rock.
Iraqi National Journal of Earth Sciences
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The U-Pb SHRIMP dating of titanite reveal their Variscan ages in an interval of ± to ± Ma (Tournaisian to Visean); titanite U-Pb ages are thus.
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SHRIMP U-Pb dating of the preeruption growth history of zircons from the ka Whakamaru Ignimbrite, New Zealand: Evidence for > k.y.
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. Shibboleth Sign In. OpenAthens Sign In. Institutional Sign In.
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Canadian Journal of Earth Sciences
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U–Pb dating was per- formed using a SHRIMP II system installed at. Hiroshima University, Japan. Instrumental condi- tions and measurement procedures are.
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.
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SHRIMP U-Pb dating reveals that ages range from to Ma, the the oldest Pb/Pb zircon age so far obtained from the North China Craton.
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.
The positive secondary ions were thereby extracted and detected on a single electron multiplier by peak switching. A similar equation also describes the U—Pb secondary ion emission data from other minerals such as monazite, titanite, baddeleyite, rutile.
Rutile U-Pb Geochronology
Titanite crystals commonly shows oscillatory, sector and convolute irregular zonal textures, reflecting mainly variations in Ca and Ti versus Al 1—2 wt. Fluorine content is up to 0. Consequently, the textural, geochronological and compositional data indicate relatively high-temperature, most probably early post-magmatic subsolidus precipitation of titanite. Ackerson M. Aleinikoff J.
This age indicates adiabatic decompression and a metamorphic event associated with rapid uplift of granulites in a tectonic environment resulted from the collision between India and Eurasia, synchronous with large-scale thrusting, extension, detachment as well as emplacement of leucogranite. In summary,dating results show that granulites in this area underwent multiphase metamorphism and complex geological evolution.
SHRIMP U-Pb dating on hydrothermal zircons from auriferous quartz veins could be used to constrain the timing of lode gold mineralization and the relationship to relevant hydrothermal event. Basalt and basaltic andesite metamorphosed at greenschist facies occurs with conglomerate layers at the bottom of the Paleoproterozoic Hutuo Group in the Wutai Mountains area, North China Craton. Detailed geological surveying confirms that these volcanic rocks are conformable within the neighboring sedimentary rocks.
The latter is interpreted as the eruption age of the basaltic andesite, and gives the age of the base of the Hutuo Group. This result further suggests that the Hutuo Group formed in the middle Paleoproterozoic, not the early Palaeoproterozoic or late Archaean, as thought before,and is related to a 2.