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%0 Journal Article
%A Shaojie Li;Xuan-Ce Wang;Chao-Feng Li;Simon A. Wilde;Youyu Zhang;Suzanne D. Golding;Keyu Liu;Yuxiang Zhang
%O The Institute for Geoscience Research (TIGeR), School of Earth and Planetary Sciences, Curtin University, Perth, WA, 6845, Australia;Research Center for Earth System Science, Yunnan University, Kunming, 650500, China;The School of Earth Science and Resources, Chang’an University, Xi’an, 710054, China;School of Earth and Environmental Sciences, The University of Queensland, Brisbane, QLD, 4072, Australia;State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China;Key Laboratory for Basin Structure and Hydrocarbon Accumulation, PetroChina, Beijing, 100083, P.R. China;School of Geosciences, China University of Petroleum, Qingdao, 266555, P.R. China;Australise Resources and Environment Solutions (ARES), Wattle Grove, Perth, WA, Australia
%T Direct Rubidium-Strontium Dating of Hydrocarbon Charge Using Small Authigenic Illitic Clay Aliquots from the Silurian Bituminous Sandstone in the Tarim Basin, NW China
%J Scientific Reports
%D 2019
%V Vol.9
%N No.1
%P 12565
%K RB-SR SYSTEMATICS;K-AR;DIAGENETIC ILLITE;PETROLEUM EMPLACEMENT;ORDOVICIAN CARBONATES;FLUID INCLUSIONS;TABEI UPLIFT;OIL-FIELD;SMECTITE;ACCUMULATION
%X Illitic clay is ubiquitous in clastic hydrocarbon reservoirs, and the host for several radiometric isotopes such as the potassium-argon (K-Ar) and rubidium-strontium (Rb-Sr) systems. This study applied the isotope-dilution thermal ionization mass spectrometry technique for small samples (3–4 mg) to conduct illite Rb-Sr isotope dating of five illitic clay samples from the Silurian bituminous sandstone (SBS) intersected by five drillholes in the Tarim Basin, NW China. The <sup>87</sup>Rb/<sup>86</sup>Sr ratio of clays is fractionated mainly by the addition of Rb during the illitization of mixed-layer illite/smectite (I/S), which is the dominant clay species in the Tarim Basin samples. The subsample-scale Rb/Sr isotope values suggest that each subsample may contain I/S particles of slightly variable degrees of illitization. Three of the analyzed samples (H6, KQ1 and TZ67) generated Rb-Sr isochron ages of 141 ± 61 Ma, 332 ± 32 Ma and 235 ± 8 Ma (errors quoted at 2σ), respectively. These results are similar to the corresponding K-Ar ages (125 Ma, 389 Ma and 234 Ma). The isotopic ages are consistent with the timing of hydrocarbon charge which varies in different drillholes as constrained by basin modelling, indicating that a closed-system behavior is attained by the hydrocarbon charge that inhibits the illitization of I/S. The Rb-Sr isotope analyses of the other two samples (YM35-1 and Q1) that did not yield isochron ages suggest the conditions for producing isochrons were not satisfied, which may be caused by disturbance of the isotope system by a post-charge hydrothermal event. The outcomes of this study show the robust potential of Rb-Sr clay subsample geochronology for cross-checking isotopic ages yielded by other systems (e.g. K-Ar system) and constraining the timing of hydrocarbon charge.
%I The Institute for Geoscience Research (TIGeR), School of Earth and Planetary Sciences, Curtin University, Perth, WA, 6845, Australia;Research Center for Earth System Science, Yunnan University, Kunming, 650500, China;The School of Earth Science and Resources, Chang’an University, Xi’an, 710054, China;School of Earth and Environmental Sciences, The University of Queensland, Brisbane, QLD, 4072, Australia;State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China;Key Laboratory for Basin Structure and Hydrocarbon Accumulation, PetroChina, Beijing, 100083, P.R. China;School of Geosciences, China University of Petroleum, Qingdao, 266555, P.R. China;Australise Resources and Environment Solutions (ARES), Wattle Grove, Perth, WA, Australia
%@ 2045-2322
%R 10.1038/s41598-019-48988-3 |
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CSTR:11738.14.NCDC.XDA14.PP5976.2024
10.1038/s41598-019-48988-3