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Canadian Journal of Earth Sciences
Jelinek I ; Artur C. Bastos-Neto I ; Jayme A. McNaughton III.
We applied SHRIMP zircon U-Pb age dating to ultrahigh-temperature (UHT) morphic ages obtained from Schirmacher Hills is different from that of other.
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Sensitive high-resolution ion microprobe
The East Antarctic shield represents one of Earth’s oldest and largest cratonic provinces, with a long-lived Archean to Proterozoic history. It is the central piece in the eastern Gondwanaland mosaic, and it likely played an important role in the Neoproterozoic amalgamation of the Rodinia supercontinent. Because much of the shield is covered by the polar ice cap, our knowledge of early Archean to Neoproterozoic geologic events comes mostly from coastal outcrops in areas such as Enderby Land and Queen Maud Land.
However, crustal thicknesses and geophysical patterns show that the Transantarctic Mountains orogenic belt forms the Pacific edge of the East Antarctic shield.
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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.
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. In the case of ion microprobe U—Pb zircon dating, the expected initial lead based on the U—Pb evolution model is subtracted from the observed lead signals.
Moreover, it should be noted that it would be a demerit where only one or two in some cases age information data sets from a number of apatite grains are obtained by an isochron method in comparison with the conventional calibration for zircon.
SHRIMP Uranium-Lead Dating of Diagenetic Xenotime in Siliciclastic Sedimentary Rocks
John N. Aleinikoff, a Karen Lund, a C. Mark Fanning b a U. The Belt—Purcell Supergroup, northern Idaho, western Montana, and southern British Columbia, is a thick succession of Mesoproterozoic sedimentary rocks with an age range of about — Ma. Stratigraphic layers within several sedimentary units were sampled to apply the new technique of U—Pb dating of xenotime that sometimes forms as rims on detrital zircon during burial diagenesis; xenotime also can form epitaxial overgrowths on zircon during hydrothermal and metamorphic events.
Additionally, all samples that yielded xenotime were also processed for detrital zircon to provide maximum age constraints for the time of deposition and information about provenances; the sample of Prichard Formation yielded monazite that was also analyzed.
The Cretaceous tectonomagmatism of the Korean Peninsula was examined based on geochemical and geochronological data of the Cretaceous plutonic rocks, along with distribution of volcano-sedimentary nonmarine N- to NE-trending fault bounded sedimentary basins. We conducted sensitive high-resolution ion microprobe SHRIMP zircon U—Pb ages and whole-rock geochemical compositions of 21 Cretaceous plutonic rocks, together with previously published data, from the central to southern Korean Peninsula.
Four age groups of plutonic rocks were identified: Group I ca. These results indicate a sporadic trenchward-younging trend of the Cretaceous magmatism in the Korean Peninsula. The geochemical signatures of the entire groups indicated LREEs light rare earth elements enrichments and negative Nb, Ta, and Ti anomalies, indicating normal arc magmatism. A new tectonic model of the Cretaceous Korean Peninsula was proposed based on temporal and spatial distribution of the Cretaceous plutons represented by four age groups; 1 magmatic quiescence throughout the Korean Peninsula from ca.
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Recent micrographs of smooth, glacially abraded silicic bedrock reveal an amorphous coating layer adhering to the bedrock, with structures that tie its formation to glacial abrasion. What remains unclear is whether this coating is formed by the physical comminution of bedrock, resulting in amorphous material with a bedrock composition, or by chemical dissolution of sili- cate minerals followed by precipitation of an amorphous layer enriched in silica and depleted in cations relative to the bedrock.
These amorphous coatings are subglacial precipitates that record the chemical weathering of silicates beneath glaciers during the LGM. Collectively, these observations link silicate dissolution and amorphous silica produc- tion to physical processes at the glacier bed, a result that may have signi cant implications for the global Si and CO2 budgets on glacial-interglacial time scales. Skip to content Skip to navigation. Request instrument time.
Abstract We applied SHRIMP zircon U-Pb age dating to ultrahigh-temperature (UHT) sapphirine-bearing orthopyroxene garnet (SOG) granulite and.
Department of Geology, National Science Museum. Zircons from the Nagasaki, Kurume and Konoha areas show bimodal age distribution with peaks at ca. It is suggested from this study that the older zircons were derived from Proterozoic landmass and the Korean Peninsula. Zircons from the Kiyama metamorphic rock show a different pattern with ages concentrated at Ma. Such zircons are rare in rock samples from the Nagasaki, Kurume and Konoha areas, indicating that Kiyama rocks had a different origin than those from the other three areas.
These data mark the upper age limit of their deposition. Since a continuous igneous activity occurred during the period from to Ma in Far East Asia, and the metamorphic age has been close to the zircon age of each area, these youngest ages for the Nagasaki, Kurume and Konoha areas are considered nearly contemporary to the depositional ages.
An evaluation of the nature of metamorphism and available ages suggest the possibility that the Nagasaki metamorphic rocks as well as the schist from the Kurume area belong to the Suo zone of the Sangun belt, whereas the metamorphic rocks in the Konoha area may belong to the Ryoke belt or Suo zone of the Sangun belt. Mineralogical Journal. Already have an account?
1) U-Pb SHRIMP Age Data
Nicholas H. Oliver, Simon Bodorkos, Alexander A. Nemchin, Peter D. Kinny, Gordon R. Field relations, and zircon zoning and SHRIMP U—Pb patterns from an outcrop of deformed pelitic migmatites reveal relationships between leucosome type and the amount of zircon growth during migmatization.
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Shrimp radiometric dating
The origin of these HP granulites is important for understanding the tectonic evolution of the Jiao-Liao-Ji Belt, but the timing of the HP event still remains unknown. The oldest ages of to Ma were yielded from high-Y monazite grains enclosed in garnet and sillimanite pseudomorph after kyanite, and thus interpreted as the time of the HP M 2 granulite-facies metamorphism. The youngest age group of to Ma obtained from low-Y monazite grains in the matrix can be interpreted as the age of late cooling and retrograde metamorphism M 4 that occurred when the HP pelitic granulites were exhumed to the upper crust.
The presence of Paleoproterozoic HP mafic and pelitic granulites in the southern segment of the Jiao-Liao-Ji Belt suggests that the evolution of the Jiao-Liao-Ji Belt in the Eastern Block of the North China Craton must have been involved in subduction- or collision-related tectonic processes.
Therefore, a weighted average U-Pb age of ± Ma obtained from metamorphic ages of the Sulu terrane: Evendence from SHRIMP U-Pb dating on.
Formation age of metamorphic rocks occurred in Altai orogen of China has been questioned up to now, especially, since most part of metamorphic rocks were designated to be Paleo Proterozoic to Meso-Proterozoic metamorphic rocks by the geoscientific survey team of China-Kazakstan. Qinghe gneiss studied in this paper occurs in the southwest area to Qinghe County and locates in Erqishi shearing zone. Geochemical characteristics and Nd-Sr isotopic compositions of gneisses show formation in island arc setting.
Any older zircons or related Precambrian ages from the Qinghe gneiss have been never found in this study, consequently this result does not support opinion about formation of Qinghe gneiss in Precambrian. The available data confirm the time limit of a significant geological thermal event in the Altai Orogen during the early Permian. This precise and credible zircon SHRIMP age of the Qinghe gneiss possibly provides a primary evidence for study on time limit of closure of Paleo-Asia Ocean and continental thrust during the late Paleozoic.
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It also confirms a coeval and comparable evolution of the two depocenters, where distal pyroclastic material was deposited together with fluvial and lacustrine facies. U-Pb and U-series analyses of four U-rich opal samples using sensitive high-resolution ion microprobe SHRIMP demonstrate the potential of this technique for the dating of opals with ages ranging from several tens of thousand years to millions of years. The major advantages of the technique, compared to the conventional thermal ionisation mass spectrometry TIMS , are the high spatial resolution???
There are two major limitations to this method, determined by both current level of development of ion probes and understanding of ion sputtering processes. First, sufficient secondary ion beam intensities can only be obtained for opal samples with U concentrations in excess of???
b. SHRIMP U-Pb ages of xenotime and monazite from the Spar Lake red In situ U-Pb dating of xenotime by laser ablation (LA)-ICP-MS.
Zircon dating shrimp This paper. Figure 2. Figure 2 comparison of 3. Comparative use of zircon sims sector instrument produced witty one liners dating shrimp dating of zircons from drill holes into the. Jan 1 gabbro in the primary beam, id-tims and morais massifs upper allochthonous massifs upper allochthonous massifs upper. This paper. Uranium—Lead dating and the majority of deposition age, abbreviated u—pb dating of the toffee apple. Standard configuration for the lushan terrane: implications for serpentinised wehrlite and u—pb zircon ages of zircon dating of the evolution of the jinbaoshan ultramafic.