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. Its major significance for crustal building motivated this geochronological investigation.
Sensitive high-resolution ion microprobe
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Dating the earth with SHRIMP
John N. Aleinikoff, a Karen Lund, a C. Mark Fanning b a U.
This study applied the EPMA U-Th-Pb monazite and SHRIMP U-Pb zircon dating techniques to determine the metamorphic ages of the HP pelitic granulites in.
Arafura Basin. Bremer Sub-basin study. Nitrogen in estuaries. Diatoms and water quality. Geochronology boost. Wind risk in Australia.
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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.
We applied SHRIMP zircon U-Pb age dating to ultrahigh-temperature (UHT) morphic ages obtained from Schirmacher Hills is different from that of other.
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.
Madalena and mafic tholeiitic layered complexes anatectic granites hercynian iberian. Interpretations of 3.
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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.
U–Pb SHRIMP ages of detrital granulite-facies rutiles: further constraints on heavy mineral analysis, garnet geochemistry and detrital zircon age dating.
Methods recently advanced for discrimination on the genesis of metamorphic zircon, such as analysis of mineral inclusions and trace elements, provide us powerful means to distinguish zircon overgrowth during high-pressure metamorphism. No inherited core was identified in the analyzed zircons by means of cathodoluminescence images. The occurrence of high-pressure metamorphic mineral inclusions in zircon, such as garnet, omphacite, rutile, and the flat HREE pattern in zircon indicate that the zircon formed at high-pressure metamorphic conditions.
Therefore, a weighted average U-Pb age of This is a preview of subscription content, log in to check access. Gebauer, D.
Canadian Journal of Earth Sciences
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We used an ion microprobe (SHRIMP-RG) for U-Pb dating of individual zircons in -Ma rims signify the age of regional metamorphism, though yet another.
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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In-situ dating the formation age of glacial polish
Official websites use. Share sensitive information only on official, secure websites. Voluminous Paleozoic sandstone sequences were deposited in northern Africa and Arabia following an extended Neoproterozoic orogenic cycle that culminated in the assembly of Gondwana.
It is possible to estimate the age of sedimentary rocks by in situ uranium-lead analysis of that xenotime. Two Proterozoic sandstone units from northwestern.
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. Zircons show CL evidence for substantial anatectic growth and overgrowths with post Ma ages, and a single population age 20 my younger than the other migmatites.
Geochronology, Time Scales and Global Stratigraphic Correlation
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.
No bias can be detected between the three dating methods, confirming that SHRIMP zircon Pb/U ages are accurate and comparable with other well-.
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.
Together, these rock units record Archean crustal growth, Proterozoic crustal modifications, sediment deposition across a Neoproterozoic rift margin, and early Paleozoic plate-margin convergence. The central Transantarctic Mountains is therefore a critical area along the Pacific margin of East Antarctica to study both the Precambrian crystalline shield and its deformed supracrustal cover.
From a relatively small number of samples analyzed to date, SHRIMP analysis has demonstrated a multi-stage Archean and Proterozoic history of the Nimrod Group, and placed new constraints on the depositional age and sedimentary provenance of the Beardmore Group. This new project will significantly expand the geochronological framework of basement and supracrustal assemblages in the Transantarctic Mountains, with goals as follows: 1. Detailed study of metamorphic and igneous rocks from the Nimrod Group, in order to fully characterize the Archean and Proterozoic history of Precambrian igneous, metamorphic and detrital zircon components, as well as the Ross-age pre-, syn- and post-tectonic magmatic sequence.
Expanded study of siliciclastic rocks from the Beardmore Group and related lower Paleozoic sequences, primarily by age analysis of detrital zircons in order to constrain depositional ages and sedimentary provenance. With existing sample material and some provided by other researchers from other parts of the Transantarctic Mountains, it will be possible to address regional provenance variations among these transitional Neoproterozoic-lower Paleozoic sequences.
Diagenetic xenotime will also be analyzed in order to attempt direct dating of the depositional age of the different rock units.
Shrimp radiometric dating
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 U/Pb (SHRIMP) age of zircons from basal layers of the Baraba Formation and some geological conse- quences inferable from dating results.
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