Sensitive high-resolution ion microprobe

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Canadian Journal of Earth Sciences

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. Underlying the central Transantarctic Mountains are crystalline basement rocks of the shield itself Nimrod Group , juxtaposed against Neoproterozoic and lower Paleozoic marginal-basin sedimentary assemblages Beardmore and Byrd groups.

magmatic zircon SHRIMP U-Pb dating, and an upper limit age of ± 3Ma (​2σ), which was constrained by SHRIMP dating of magmatic zircons from adjacent​.

The Xilin Gol Complex, consisting of deformed and metamorphosed rocks, was exposed as a large geological unit within the Central Asian Orogenic Belt, but its forming and subsequent deformed and metamorphic time has been an issue of little consensus. Consequently, it is not the Precambrian terrane as previously considered by most geologists. More or less, the major rock — biotiteplagioclase gneiss within the Complex is more likely to be Paleozoic fore-arc turbidite formation before metamorphism and intensive deformation, in which the detrital zircons gave sporadic Precambrian ages as old as up to 3.

The source of the turbidite formation is multiple, which may be derived either from the North China Craton, or from the South-Mongolia Micro-continent, or probably came from a potential and undiscovered in situ terranes aged — Ma or even up to ca 3. This is a preview of subscription content, log in to check access. Google Scholar. Shao, J.

In-situ dating the formation age of glacial polish

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.

No bias can be detected between the three dating methods, confirming that SHRIMP zircon Pb/U ages are accurate and comparable with other well-​.

Jonathan C. Mark Fanning, Berggren, Dennis V. Shibboleth Sign In. OpenAthens Sign In. Institutional Sign In. Geochronology, Time Scales, and Global Stratigraphic Correlation – The last decade has witnessed significant advances in analytic techniques and methodologic approaches to understanding earth history. This publication is a well-constructed geochronologic framework that allows estimation of rates of geologic processes, correlation of stratigraphies, and placement of discrete events in temporal order.

Resulting from a research symposium at the 67th Annual SEPM meeting in New Orleans, Louisiana, April , the 16 papers of this volume represent a broad spectrum of approaches to understanding earth history and the passage of geologic time. Sign In or Create an Account. User Tools. Sign In. Advanced Search. Book Chapter.

1) U-Pb SHRIMP Age Data

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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.

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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 ?

We conducted sensitive high-resolution ion microprobe (SHRIMP) zircon U–Pb ages and whole-rock geochemical compositions of

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. User Name Password Sign In. This Article doi: Services Email this article to a colleague Alert me when this article is cited Alert me if a correction is posted Similar articles in this journal Similar articles in Web of Science Download to citation manager.

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Shrimp radiometric dating

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Positions of SHRIMP II analytical sites with ages (in Ga) are indicated. Note strong luminescence in small, local domains, probably due to recrystallization (​RC).

Thus, SIMS method is well-suited for the analysis of complex minerals, as often found in metamorphic terrains, some igneous rocks , and for relatively rapid analysis of statistical valid sets of detrital minerals from sedimentary rocks. The most common application of the instrument is in uranium-thorium-lead geochronology , although the SHRIMP can be used to measure some other isotope ratio measurements e. Bill Compston , [2] trying to build an ion microprobe at the Research School of Earth Sciences of the Australian National University that exceeded the sensitivity and resolution of ion probes available at the time in order to analyse individual mineral grains.

The first successful geological applications occurred in Narryer in Western Australia [6] and then later at the nearby Jack Hills. Growing interest from commercial companies and other academic research groups, notably Prof. Further advances in design have also led to multiple ion collection systems already introduced in the market by a French company years before , negative-ion stable isotope measurements and on-going work in developing a dedicated instrument for light stable isotopes.

SHRIMP is an important tool for understanding early Earth history having analysed some of the oldest terrestrial material including the Acasta Gneiss [18] [19] and further extending the age of zircons from the Jack Hills. More recent uses include the determination of Ordovician sea surface temperature , [23] the timing of snowball Earth events [24] and development of stable isotope techniques. The ions are extracted from the plasma and accelerated at 10 kV.

Three quadrupole lenses focus the secondary ions onto a source slit and the design aims to maximise transmission of ions rather than preserving an ion image unlike other ion probe designs. A mechanically-operated slit provides fine-tuning of the energy spectrum transmitted into the magnetic sector [28] and an electrostatic quadrupole lens is used to reduce aberrations in transmitting the ions to the magnetic sector. Essentially, the path of a less massive ion will have a greater curvature through the magnetic field than the path of a more massive ion.

Thus, altering the current in the electromagnet focuses a particular mass species at the detector.

Dating the earth with SHRIMP

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.

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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??? However, this restriction still permits dating of a large variety of opals. Nevertheless, an assumption of similar behaviour of standard and unknown opals under similar analytical conditions allowed successful determination of ages with precisions of???

All rights reserved. However, there are still large areas with unknown stratigraphic allocation, age and extension. Twelve sandstones were selected for modal analysis and 15 samples 7 sandstones and 8 mudstones for whole rock chemical analysis.