Abstract
Both low procedural blank and high-precision measurements of isotopic ratios are crucial for the analysis of micro samples. This study reports a chemical procedure of ultra-low blank for the high precision measurement of Sr isotopic ratios on micro samples (< 1 ng level) using a new-type thermal ionization mass spectrometer IsoProbe-T, with a case study of single-grain Rb-Sr isochron dating on phlogopite from the Fuxian kimberlite in Liaoning Province. This method can be employed in studies of high resolution Rb-Sr geochronology and Sr isotopic geochemistry and thus will broaden application of the Rb-Sr isotopic system to earth sciences.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Zheng, Y. F., Influence of the nature of the initial Rb-Sr system on isochron validity, Chemical Geology, 1989, 80: 1–16.
Villa, I. M., Isotopic closure, Terra Nova, 1998, 10: 42–47.
Zheng, Y. F., Wang, Z. R., Li, S. G. et al., Oxygen isotope equilibrium between eclogite minerals and its constraints on mineral Sm-Nd chronometer, Geochim. Cosmochim. Acta, 2002, 66: 625–634.
Carswell, D. A., O’Brien, P., Wilson, R. et al., Thermobarometry of phengite-bearing eclogites in the Dabie Mountains of central China, Journal of Metamorphic Geology, 1997, 15: 239–252.
Li, S. G., Jagoutz, E., Chen, Y. Z. et al., Sm-Nd and Rb-Sr isotopic chronology and cooling history of ultrahigh pressure metamorphic rocks and their country rocks at Shuanghe in the Dabie Mountains, central China, Geochimica et Cosmochimica Acta, 2000, 64: 1077–1093.
Li, S. G., Sun, W. D., Zhang, Z. Q. et al., Nd isotopic disequilibrium between minerals and Rb-Sr age of the secondary phengite in eclogite from the Yangkou area, Qingdao, eastern China, Chinese Science Bulletin, 2001, 46(3): 252–255.
Chen, C. H., DePaolo, D. J., Lan, C. Y., Rb-Sr microchrons in the Manaslu granite: Implications for Himalayan thermochronology, Earth Planetary Science Letters, 1996, 143: 125–135.
Müller, W., Aerden, D., Halliday, A. N., Isotopic dating of strain fringe increments: duration and rates of deformation in shear zones, Science, 2000, 288: 2195–2198.
Müller, W., Mancktelow, N. S., Meier, M., Rb-Sr microchrons of synkinematic mica in mylonites: an example from the DAV fault of the Eastern Alps, Earth and Planetary Science Letters, 2000, 180: 385–397.
Müller, W., Strengthening the link between geochronology, textures and petrology, Earth and Planetary Science Letters, 2003, 206: 237–251.
Li, Q. L., Li, S. G., Zheng, Y. F. et al., A high precision U-Pb age of metamorphic rutile in ultrahigh-pressure eclogite from Dabie Mountains, central China: A new constraint on the cooling time, Chemical Geology, 2003, 200: 255–265.
Lu, F. X., Zhao, L., Deng, J. F. et al., The discussion on the ages of kimberlitic magma activity in North China platform, Acta Petrologica Sinica, 1995, 11(4): 365–374.
Cliff, R. A., Isotopic dating in metamorphic belts, Journal of Geological Society London, 1985, 142: 97–110.
Allsopp, H. L., Bristow, J. W., Smith, C. B. et al., A summary of radiometric dating methods applicable to kimberlites and related rocks, in Kimberlites and Related Rocks (eds. Ross, J. et al.), Geological Society of Australia, Special Publication, 1989, No. 14(1): 343–357.
Dobbs, P. N., Duncan, D. J., Hu, S. et al., The geology of the Mengyin kimberlites, Shandong, China, in Kimberlites, related rocks and mantle xenoliths (eds. Meyer, O. A., Leonardos, O. H.), CPRM Special Publication, 1994, 1A/93: 40–61.
Brown, R. W., Allsopp, H. L., Bristow, J. W., Improved precision of Rb-Sr dating of kimberlite micas-an assessment of a leaching technique, Chemical Geology, 1989, 29(2): 125–136.
Chen, E, Siebel, W., Satir, M. et al., Geochronology of the Karadere basement (NW Turkey) and implications for the geological evolution of the Istanbul zone, International Journal of Earth Sciences, 2002, 91: 469–481.
Horwitz, E. P., Chiarizia, R., Dietz, M. L., A novel strontium-selective extraction Chromatographic resin, Solv. Extract. Ion Exchange, 1992, 10: 313–336.
Ludwig, K. R., Users Manual for Isoplot/Ex: A Geochronoligical Toolkit for Microsoft Excel, Berkeley Geochronology Center Special Publication, Berkeley, CA, USAA, 2000, 53.
Wu, F. Y., Sun, D. Y., Li, H. M. et al., A-type granites in north-eastern China: age and geochemical constrains on their petrogenesis, Chemical Geology, 2002, 187: 143–173.
Zindler, A., Hart, S. R., Chemical geodynamics, Annual Review of Earth and Planetary Sciences, 1986, 14: 493–571.
Fraser, K. J., Hawkesworth, C. J., Erlank, A. J. et al., Sr, Nd, Pb isotope and minor element geochemistry of lamproites and kimberlites, Earth and Planetary Science Letters, 1985, 76: 57–70.
Zheng, Y. F., Zhao, Z. F., Li, S. G. et al., Oxygen isotope equilibrium ultrahigh-pressure metamorphic minerals and its constraints on Sm-Nd and Rb-Sr chronometers, in Geochronology: Linking the Isotope Record with Petrology and Textures (eds. Vance, D., Müller, W., Villa, I.), Geological Society Special Publications, 2003, 220: 93–117.
Zheng, Y. F., Yang, J. J., Gong, B. et al., Partial equilibrium of radiogenic and stable isotope systems in garnet peridotite during UHP metamorphism. Am. Mineral., 2003, 88: 1633–1643.
Xie, Z., Zheng, Y. F., Jahn, B. M. et al., Sm-Nd and Rb-Sr dating for pyroxene-garnetite from North Dabie in east-central China: Problem of isotope disequilibrium due to retrograde metamorphism, Chem. Geol., 2004, 206: 137–158.
Zhao, Z. F., Zheng, Y. F., Wei, C. S. et al., Temporal relationship between granite cooling and hydrothermal uranium mineralization at Dalongshan in China: a combined radiometric and oxygen isotopic study, Ore Geol. Rev, 2004, 25: 221–236.
Author information
Authors and Affiliations
Corresponding author
About this article
Cite this article
Li, Q., Chen, F., Wang, X. et al. Ultra-low procedural blank and the single-grain mica Rb-Sr isochron dating. Chin.Sci.Bull. 50, 2861–2865 (2005). https://doi.org/10.1360/982005-984
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1360/982005-984