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| Titel |
New data about the reasons of periodic sulfide crystallization-dissipation in ultrabasic magmas. |
| VerfasserIn |
Alex Asavin, Alex Ariskin |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250103368
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| Publikation (Nr.) |
 EGU/EGU2015-2779.pdf |
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| Zusammenfassung |
| Possible manifestation of sulfide mineralization in the intrusive complexes of basic and
ultrabasic rocks depends on the two main factors: sulphide liquid immisiblity and segregation
(concentration) of sulfide minerals as crystallization primary and derived magmas. One of the
news models in order to calculate the saturation concentration of sulfur basic and ultrabasic
melts proposed in the (program SULSAT [Ariskin et.al., 2013]). In this model, the first time
takes into account the effect of nickel on the solubility and the composition of the sulfide
phase with variable composition (FeS-NiS). Thanks to the detailed evaluation of our
conditions of crystallization of olivine and spinel meimechite and picritic melts [Asavin
2014]. an opportunity to assess the value SCSS (Sulfur Content at Sulfide Saturation) from
model SULSAT mantle melts in the ultrabasic magma camera. We obtained, the large
statistical material on the distribution of sulfur in the samples groundmass and in the
bulk rocks, we can reliably assess the level of actual sulfur content in natural melts
(Tabl1-2). According theoretical model we calculated SCSS in natural volcanic melts -
meimechites and picrites (lava and dyke Maimecha-Kotuy province Siberia [Asavin
2014]).
Tabl.1 Calculation for meimechite samples.
Sample.T(C)-Log fO2#S (wt%)S6+/#SSiO2 MgO CaO Na2OK2ONiOS (ppm)
251_2 15144.59 0.43 0.40 41.9625 9.23 0.16 0.7 0.14237
251_2 15104.62 0.48 0.42 39.9322.937.13 0.24 0.87 0.12270
50C 13406.09 0.31 0.29 40.7615.0114.630.35 0.4 0.32
8313 14754.9 0.32 0.28 42.5621.7811.4 0.3 0.23 0.10139
85_19 14664.97 0.40 0.39 42.0421.069.65 0.44 1.31 0.07139
85_22 14814.85 0.40 0.41 41.4422.1310.140.44 1.28 0.10539
85_27 14984.72 0.73 0.51 41.1 23.332.56 0.76 1.01 0.241120
85_38 15804.09 0.51 0.41 38.1727.096.1 0.1 0.2 0.15197
85_38 15884.03 0.50 0.41 41.0729.936.74 0.1 0.22 0.15291
195 14714.93 0.37 0.30 39.2 19.7 7.38 0.4 0.59 0.17661
195 15254.5 0.41 0.34 41.4225 9.04 0.47 0.4 0.20700
199 15694.17 0.48 0.43 40.3626.335.22 0.19 1 0.19491
201 15174.57 0.45 0.40 39.0523.278.59 0.16 0.83 0.00194
202 15204.54 0.33 0.39 38.8423.6210.860.26 0.76 0.09192
202 14954.74 0.44 0.55 40.9221.329.44 0.71 4.75 0.09177
204 14475.13 0.46 0.46 41.1620.448.99 1.05 1.08 0.17316
204 15884.03 0.48 0.46 39.5227.555.69 0.5 0.74 0.19500
207 16273.76 0.40 0.45 40.7430.714.85 0.57 0.27 0.19998
209 16803.4 0.48 0.49 37.8 32.684.64 0.91 0.08 0.23340
215 15444.36 0.38 0.41 39.3824.788.38 0.31 0.78 0.20891
215 16033.93 0.44 0.42 40.1830.127.65 0.22 0.5 0.20897
87_216 14575.05 0.53 0.52 39.4819.978 1.46 1.86 0.21300 |
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