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IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy (S) - IASPEI - International Association of Seismology and Physics of the Earth's Interior JSS001 Poster presentation 1727 Halite fluid inclusion geochemistry of evaporite deposits in central iran Mrs. Zeinab Shariatinia GEOLOGY-SEDIMENTOLOGY SCHOOL of Geology-University of TehranTehran14155 IASPEI Cendon Dioni I, Pueyo Juan Jose, Rahimpour- Bonab Hussain, Hezarhani Ardeshir The chemical analyses of major ions in primary halite fluid inclusions is widely used for the determination and characterization of brine chemistry and its evolution in ancient evaporite basins through the Phanerozoic (eg. AYORA et al., 2001; BRENNAN and LOWENSTEIN, 2002; HORITA et al., 2002; KOVALEVICH et al., 2002). The purpose of this study is to show the major ion compositional evolution and halite crystallization pathway in the Miocene, M1 member of the Upper Red Fm. (N, Great Kavir Basin, Iran). We show how the Rift setting of the Great Kavir Basin, exerted the main control on the modification of seawater major ion chemistry. Influx of Ca-Cl2 brines modified the earlier evaporated seawater into Ca- Mg- Na- Cl brines. In this case, the Ca2+ concentration of the evolving brine exceeded overall concentrations of SO42-, HCO3-, and CO32- ions, which is expressed as mCa2+>∑(mSO42- + mHCO3- + mCO32-). From this modified brine MgSO4-poor potash salts (mainly halite, sylvite and carnallite) precipitated. The study of major ion variation for evaporite deposits in the mentioned area reveals that the evaporation path in the Great Kavir Basin was not the same as presentday seawater. The geochemical diagrams (e.g. Mg vs. SO4 and K) show that major ions followed different evolution trends. Seemingly, an externally Ca-Cl2 influx would have overridden the chemical signature of evaporated seawater within Great Kavir Basin. As a result, sylvite instead of K-Mg-sulfates precipitated, similar to that observed in other rift settings such as the Danakil Depression (Ethiopia) in Quaternary evaporates where secular seawater compositional changes can not justified the observed lithologies. Ayora C., Cendn D. I., Taberner C., and Pueyo J. J. (2001) Brine-mineral reactions in evaporite basins: Implications for the composition of ancient oceans. Geology 29(3), 251-254. Brennan S. T. and Lowenstein T. K. (2002) The major-ion composition of Silurian seawater. Geochimica et Cosmochimica Acta 66(15), 2683-2700. Horita J., Zimmermann H., and Holland H. D. (2002) Chemical evolution of seawater during the Phanerozoic: Impliations from the record of marine evaporites. Geochimica et Cosmochimica Acta 66(21), 3733-3756. Kovalevich V. M., Peryt T. M., Beer W., Geluk M., and Halas S. (2002) Geochemistry of Early Triassic seawater as indicated by study of Rt halite in the Netherlands, Germany and Poland. Chemical Geology 182, 549-563. Keywords: fluidinclusion, evaporite, centraliran
IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy (S) - IASPEI - International Association of Seismology and Physics of the Earth's Interior JSS001 Poster presentation 1728 Effect of mineral content of granitoids of the ukrainian shield on the change of their elastic parameters in different thermobaric conditions of the lithosphere (by experimental data) Mrs. Elena Karnaukhova Physical Properties of the Earth's substance S.I.Subbotin Inst. of Geophysics of NASU IASPEI Korchin Valery On an example of optimal sampling of the Ukrainian Shield (USh) granitoids whose main rock-forming minerals are quartz, plagioclase, potassium feldspar, biotite, some dependences of their elastic parameters on the mineral content at pressures and temperatures are shown. The increasing amount of quartz in the rock decreases the change of the elastic velocities by pressure, while the growth of the plagioclase content of biotite increases them. The growth of the potassium feldspar content first increases and then decreases the velocity change. For the Ukrainian Shield rocks the elastic velocity of longitudinal polarization (Vp) values increase abruptly in the programmed PT regimes of the experiments at depths of 0-7 km. After reaching a definite limit, they begin to decrease nearly to the depth of 7-15 km and then increase again. Thus, on the curves of the depth distribution of velocity, inversion zones are distinguished which change their width with depth (∆H) and diminish the velocity maximally (∆Vp). The existence of these zones is due to the essentially opposite effect of pressures and temperatures (corresponding with definite depths) on the rocks. To solve the problem set the method of the multidimensional correlation-regression analysis was used together with the explosion seismology data. It was shown that different-gradient change of the velocity with depth sometimes corresponds with a definite change of the mineral content of the rocks the main effect being exerted by the regional deep pressures and temperatures. Only with notable change of Vp with depth appreciable mineral content change may be expected. E.g., if the velocity inversion zones show ∆Vp>0,3 km·s-1 the mineral content change should also be suggested. In this case the rocks should first of all be enriched with quartz, while the intensive velocity growth seen after the inversion zone immediately (above 16 km) may be due to the increased plagioclase and pyroxene content of the rocks, the quartz content being decreased. The obtained experimental data of a broad spectrum of rocks are used for petrographic modeling of the Earth interior enabling us to forecast the content and state of the mineral matter of the lithosphere. Keywords: granitoid, thermobaric conditions, lithosphere
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