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The performance of the Noblesse multi-collector noble gas mass spectrometer for ^(40)ar/^(39)ar geochronology

Acta Geochimica 2018年第5期37卷 734-745页

作者： Defeng He Finlay M.Stuart Dan N.Barfod Fang Xiao Hong Zhong State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences Isotope Geoscience Unit Scottish Universities Environmental Research Centre NERC argon Isotope Facility Scottish Universities Environmental Research Centre

Noblesse multi-collector noble gas mass spec- trometer is specially designed for multi-collection of ar isotopes with different beam sizes, especially for small ion beams, precisely, and hence is perfectly suitable for ^40ar/^39ar geochronology. We have analyzed widely used sanidine, muscovite, and biotite standards with recom- mended ages of - 1.2-133 Ma, with the aim to assess the reliability of Noblesse for ^40ar/^39ar dating. An ESI MIR10 30W CO2 laser was used for total fusion or incremental heating samples. Extracted gases were routinely purified by four SAES NP10 getters （one at - 400 ℃ and others at room temperature）. A GP50 getter and a metal cold finger cooled by liquid N （- 196 ℃） were also attached for additional purification if necessary. The ar isotopes were then measured by Noblesse using Faraday or multiplier according to the signal intensities. Over a period of 1.5 months 337 air calibrations produced a weighted mean ^40ar/^36ar of 296.50 ± 0.08 （2σ, MSWD = 4.77）. Fish Canyon sanidine is used to calculate J-values, which show good linear relationship with position in irradiation. The age of four mineral standards （Alder Creek sanidine, Brione muscovite, Yabachi sanidine, and Fangshan biotite） are within error of the accepted ages. Five Alder Creek sanidine aliquots yielded an age range of 1.174-1.181 ± 0.013 Ma （2σ） which broadly overlaps the established age of the standard and the uncertainty approaches those of the foremost ar/ar laboratories in the world. The weighted mean ages of four Brione muscovite aliquots （18.75 i 0.16 Ma, 2σ）, five Yabachi sanidine aliquots （29.50 ± 0.19 Ma, 2σ）, and three Fangshan bio- tite aliquots （133.0 ± 0.76 Ma, 2σ） are consistent with the recommended values of these standards, and the uncer- tainties are typical of modem ar/ar laboratories world- wide.

关键词： ar/ar geochronology Multi-collector Highprecision Noblesse Age standard

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Triassic to Cenozoic multi-stage intra-plate deformation focused near the Bogd Fault system,Gobi Altai,Mongolia

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Geoscience Frontiers 2015年第5期6卷 723-740页

作者： Douwe J.J.van Hinsbergen Dickson Cunningham Gijsbert B.Straathof Morgan Ganerod Bart W.H.Hendriks arjan H.Dijkstra Department of Earth Sciences Utrecht University Department of Environmental Earth Science.Eastern Connecticut State University SGS Horizon B.V. Stationsplein 6.2270 JB VoorburgThe Netherlands Geological Survey of Norway.Center of Geodynamics Statoil ASA.Rotvoll Norway School of Geography.Earth and Environmental Sciences.Plymouth University

The Gobi Altai region of southern Mongolia has been in the Eurasian plate interior since the midMesozoic,yet has experienced episodic phases of deformation since that *** this paper,we document field evidence to characterize and date the intra-plate tectonic history of the Gobi Altai region from the Triassic to the *** this end,we provide detailed mapping of the structure and stratigraphy of the eastern flanks of *** Bogd that contains the widest variety of rock-time units in the *** carry out geochronological analysis of basaltic lavas and basement granite in the *** demonstrate that a crystalline basement with a 502 ± 8 Ma granitoid（U/Pb） underwent two phases of basin formation in the *** we date with new40ar/39ar lava ages of 218.5 ± 1.5,123.2 ± 0.7 and 124.8 ± 1.2 Ma,*** phases are linked to deposition of fluvio-lacustrine sediments and trap-like basaltic volcanics,with cumulative thicknesses of 1000-1500 *** basins were likely north-facing half-grabens that developed underN-S extension,but were subsequently overthrusted by Paleozoic and older crystalline basement during a less well constrained,but likely mid-Cretaceous phase of N-S shortening and basin *** results are consistent with recent seismic imaging of rift basins100 km to the NE of the study area where a similar history was *** multiple phases of intra-plate deformation appear to have parallel structural trends,most likely due to reactivated Paleozoic basement structures created during the original terrane amalgamation of the Central Asian Orogenic Belt continental *** strong basement heterogeneity may predispose it to reactivation,and make it sensitive to changes in the overall stress field of the Eurasian plate driven by forces at its margins and *** study of Mongolia’s multi-stage tectonic history may thus provide a key proxy for the long-term dynamics of the Eurasian *** addition,the repeated reactivation

关键词： ar/ar geochronology Intra-plate deformation U/Pb geochronology Compression Extension

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