Reichow, M. K. (2002) 40Ar/39Ar Dates from the West Siberian Basin: Siberian Flood Basalt Province Doubled. Science, 296 (5574). 1846-1849 doi:10.1126/science.1071671
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | 40Ar/39Ar Dates from the West Siberian Basin: Siberian Flood Basalt Province Doubled | ||
| Journal | Science | ||
| Authors | Reichow, M. K. | Author | |
| Year | 2002 (June 7) | Volume | 296 |
| Page(s) | 1846-1849 | Issue | 5574 |
| Publisher | American Association for the Advancement of Science (AAAS) | ||
| DOI | doi:10.1126/science.1071671Search in ResearchGate | ||
| Mindat Ref. ID | 2535128 | Long-form Identifier | mindat:1:5:2535128:4 |
| GUID | 4d32ce8b-c7ac-46c2-bda5-bda54380560b | ||
| Full Reference | Reichow, M. K. (2002) 40Ar/39Ar Dates from the West Siberian Basin: Siberian Flood Basalt Province Doubled. Science, 296 (5574). 1846-1849 doi:10.1126/science.1071671 | ||
| Plain Text | Reichow, M. K. (2002) 40Ar/39Ar Dates from the West Siberian Basin: Siberian Flood Basalt Province Doubled. Science, 296 (5574). 1846-1849 doi:10.1126/science.1071671 | ||
| In | (2002, June) Science Vol. 296 (5574) American Association for the Advancement of Science (AAAS) | ||
References Listed
These are the references the publisher has listed as being connected to the article. Please check the article itself for the full list of references which may differ. Not all references are currently linkable within the Digital Library.
| S. Self et al. in Large Igneous Provinces J. J. Mahoney M. F. Coffin Eds. (Geophysical Monograph 100 American Geophysical Union Washington DC 1997) pp. 381–410. | |
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| M. Sharma in Large Igneous Provinces J. J. Mahoney M. F. Coffin Eds. (Geophysical Monograph 100 American Geophysical Union Washington DC 1997) pp. 273–295. | |
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| Westphal, Michel, Gurevitch, Evgueni L., Samsonov, Boris V., Feinberg, Hugues, Pozzi, Jean Pierre (1998) Magnetostratigraphy of the lower Triassic volcanics from deep drill SG6 in western Siberia: evidence for long-lasting Permo-Triassic volcanic activity. Geophysical Journal International, 134 (1) 254-266 doi:10.1046/j.1365-246x.1998.00557.x |
| A. I. Al'Mukhamedov et al. Rus. Geol. Geophys. 40 1550 (1999). | |
| D. Schissel R. Smail in Mantle Plumes: Their Identification Through Time R. E. Ernst et al. Eds. (Geological Society of America Boulder CO 2001) pp. 291–322. | |
| Pringle M. S., et al., Terra Nova 3/95, 120 (1995). | |
| Plagioclase and biotite crystals were crushed and sorted into two size fractions: 125 to 250 μm and 250 to 500 μm. Plagioclase was magnetically separated and ultrasonically cleaned with 6 N HCl and distilled water before hand-picking; biotite was ultrasonically cleaned with distilled water before hand-picking. The minerals were wrapped in 99.99+% pure Cu foil and irradiated in the Cd-lined RODEO facility at the European Commission HFR at Petten Netherlands. Biotite standard GA1550 was used as the fast neutron fluence monitor with a reference age of 98.79 Ma (30). All 40 Ar/ 39 Ar data referred to in this paper are reported relative to 98.79 Ma for GA1550 using the values given in (30); all errors are reported as internal errors only given at the 2σ significance level. | |
| The proportion of 39 Ar released in the age spectra plateau ranges from 90 to 98%. Low apparent ages in the lowest temperature release fraction for all samples indicate that minor amounts of 40 Ar* were lost as a result of alteration. This is also indicated by the high K/Ca ratios for the same temperature range (Fig. 2). Slightly elevated K/Ca ratios at higher temperatures may be the result of melting of the Cu foil capsule. Weighted plateau ages were calculated using the inverse of the variance for each step; isotope correlation diagrams of 40 Ar/ 36 Ar versus 39 Ar/ 36 Ar (normal isochron not shown) and inverse isochrons (Table 1) were calculated using a weighted York-2 fit (31). Ages for all three calculations are within error (2σ) and the mean squared weighted deviation (MSWD) for the age plateau is lower than 1.6 for all samples. | |
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 | Brent Dalrymple, G, Czamanske, Gerald K, Fedorenko, Valeri A, Simonov, Oleg N, Lanphere, Marvin A, Likhachev, Alexander P (1995) A reconnaissance geochronologic study of ore-bearing and related rocks, Siberian Russia. Geochimica et Cosmochimica Acta, 59 (10) 2071-2083 doi:10.1016/0016-7037(95)00127-1 |
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 | Fedorenko, Valeri A., Lightfoot, Peter C., Naldrett, Anthony J., Czamanske, Gerald K., Hawkesworth, Chris J., Wooden, Joseph L., Ebel, Denton S. (1996) Petrogenesis of the Flood-Basalt Sequence at Noril'sk, North Central Siberia. International Geology Review, 38 (2) 99-135 doi:10.1080/00206819709465327 |
 | Lightfoot, P. C., Hawkesworth, C. J., Hergt, J., Naldrett, A. J., Gorbachev, N. S., Fedorenko, V. A., Doherty, W. (1993) Remobilisation of the continental lithosphere by a mantle plume: major-, trace-element, and Sr-, Nd-, and Pb-isotope evidence from picritic and tholeiitic lavas of the Noril'sk District, Siberian Trap, Russia. Contributions to Mineralogy and Petrology, 114 (2) 171-188 doi:10.1007/bf00307754 |
| The basalts we analyzed all have Gd/Yb ratios of <2 and La/Sm ratios between 1.8 and 6.0. TiO 2 is mostly less than 1.5% between 5 and 10% MgO. | |
| M. L. Lur'ye V. L. Masaytis in Flood Basalts V. S. Sobolev Ed. (Nauka Moscow 1964) pp. 13–26. (in Russian). | |
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| Courtillot V., Isr. J. Earth Sci. 43, 255 (1994). | |
| ___ Evolutionary Catastrophes (Cambridge Univ. Press Cambridge 1999). | |
| Bowring et al. (32) obtained a U/Pb age of 251.4 ± 0.3 Ma on zircons (multi- and single-grain) from the ash layer (Bed 25) below the P-Tr boundary at Meishan China. | |
| Mundil et al. (33) obtained a U/Pb age of 252.5 ± 0.3 Ma on zircon grains from the ash layer (Bed 28) above the P-Tr boundary at Meishan. | |
| The small but significant discrepancy between U/Pb (zircon) and 40 Ar/ 39 Ar ages is supported by recent detailed studies such as (34–36). An explanation for the discrepancy is that the currently accepted ages for 40 Ar/ 39 Ar standard minerals are too young and/or the currently accepted potassium decay constant is too high. | |
| Becker et al. (37) report fullerenes (from P-Tr boundary sediments) that contain trapped noble gases with isotopic ratios indicative of an extraterrestrial source. Attempts to replicate these results have been unsuccessful (38). | |
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 | Mundil, Roland, Metcalfe, Ian, Ludwig, Kenneth R., Renne, Paul R., Oberli, Felix, Nicoll, Robert S. (2001) Timing of the Permian–Triassic biotic crisis: implications from new zircon U/Pb age data (and their limitations) Earth and Planetary Science Letters, 187 (1) 131-145 doi:10.1016/s0012-821x(01)00274-6 |
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| Supported by a University of Leicester studentship (M.K.R.) a Royal Society Dorothy Hodgkin Research Fellowship (R.V.W.) and a Royal Society International Exchanges grant (A.D.S.). The 40 Ar/ 39 Ar analysis at SUERC was supported under Natural Environment Research Council grant IP/641/0300. We thank L. Chambers and J. Imlach for help with the 40 Ar/ 39 Ar analysis and R. J. Aldridge W. D. Cunningham R. W. England G. R. T. Jenkin P. K. Maguire and an anonymous reviewer for comments. |
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