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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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Discussion on dating the Late Precambrian volcanicity of England and Wales
Age and biostratigraphy of Early Cambrian tuffs from SE Australia and southern China
Dating the Late Precambrian volcanicity of England and Wales
Detrital Zircon Geochronology of Taconian and Acadian Foreland Sedimentary Rocks in New England
Interpretation of SHRIMP and isotope dilution zircon ages for the Palaeozoic time-scale: II. Silurian to Devonian
Interpretations of SHRIMP and isotope dilution zircon ages for the geological time-scale: 1. The early Ordovician and late Cambrian
Geological age by instrumental analysis; the 29th Hallimond Lecture
Numerical ages of volcanic rocks and the earliest fauna1 zone within the Late Precambrian of east Poland
Applications of the SHRIMP I ion microprobe to the understanding of processes and timing of diamond formation
Remnants of ≥3800 Ma crust in the Chinese part of the Sino-Korean craton
Zircon U-Pb ages for the Early Cambrian time-scale
Ion-probe zircon dating of a mid-Early Cambrian tuff in South Australia
A SHRIMP ion microprobe study of inherited and magmatic zircons from four Scottish Caledonian granites
Using the ion microprobe SHRIMP we have analysed zircons from the Ben Vuirich, Glen Kyllachy, Inchbae and Vagastie Bridge granites from the Scottish Caledonides, in an attempt to resolve the ages of inherited zircons shown to be present in these granites by previous conventional multigrain analyses. Middle Proterozoic age components were found in inherited zircons from all four granites. Late Proterozoic (900–1,100 Ma) components have been identified in zircons from the Glen Kyllachy and Ben Vuirich granites in the Grampian Highlands. A Late Archaean age has only been detected in one zircon from the Glen Kyllachy granite. The distribution of inherited components in the granite zircon populations could reflect fundamental divisions in the age composition of granite source rocks; however, detailed assessment of this possibility must await further ion microprobe analyses on zircons from many more granites. SHRIMP isotopic and U, Th and Pb analyses were made on successive shells of zoned zircon surrounding inherited cores from the Glen Kyllachy granite to monitor chemical changes during magmatic zircon growth. Results show that zircon shells have characteristic but significantly different Th, U and Pb concentrations. Magmatic zircon from the Vagastie Bridge granite also forms as clearly defined oscillatory zoned shells around unzoned nuclei of inherited zircon. However, the distinction between magmatic and inherited zircon in zircons from the Inchbae granite is less clear. Zircons from the Ben Vuirich granite occur as euhedral, magmatic zircons, or as rounded, subhedral, inherited zircon grains. A SHRIMP age of 597±11 (2σ) Ma for euhedral magmatic zircon from this granite is identical, within the uncertainty, to the conventional multigrain zircon age of 590± 2 (2σ) Ma reported by Rogers et al. (1989) and confirms the conclusions of those authors that sedimentation of the Dalradian sequence took place in the Precambrian.