Radioactivity and geochemistry of granulites and some related rocks from the saxonian granulite complex |
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| Authors: | Ji?í Fiala Věra Vaňková Reviewer A Dudek |
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| Institution: | (1) Institute of Geology and Geotechnics, Czechosl. Acad. Sci., Prague;(2) Geophysical Institute, Czechosl. Acad. Sci., Prague |
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| Abstract: | Summary The distribution of radioactive(Th, U, K), major and selected trace(Rb, Sr, Ba, Y, Zr, V, Cr, Ni) elements of granulites from the Saxonian Granulite Complex was studied. Similarly to the South Bohemian granulites, the Saxonian granulites can be divided according to the contents of their major and trace elements into two main groups, groupA containing mostly acid and subacid granulites (K
2
O>2.5%, SiO
2
>68%), and groupB containing mostly intermediate and basic granulites (K
2
O<2.5%, SiO
2
<68%). Statistically significant differences between groupsA andB were found for all major oxides and several trace elements(Rb, V, Cr, Ni). The Saxonian granulites follow the same calc-alkaline trend as the South Bohemian, granulitesA being placed mostly in the rhyolite field and granulitesB mostly in the dacite, andesite and basalt fields of this trend. The investigated granulites are characterized by a considerable scatter ofTh andU contents accompanied by very variableTh/U ratios; theTh andU concentrations of granulitesA are substantially lower than is usual for rocks of corresponding acidity.
        ¶rt;  a  an¶rt; u a¶rt;ua mu  (Th, U, K) u u a ¶rt;u(Rb, Sr, Ba, Y, Zr, V, Cr, Ni)  m a um n¶rt;a  aaum na.  naa,  m u¶rt;aum n uu aam n aaum u ¶rt;u am   aua, u u uu.  aum n u uu ma a¶rt;um ¶rt; ¶rt;nn; nnA nua¶rt;ama a a u¶rt; u au¶rt;aum (K
2
O>2,5%, Si O
2
>68%), nnB ¶rt;u u aum (K
2
O<2,5%, SiO
2
<68%).  ¶rt; muunnau  mm mamumuu m au ¶rt; a u u ¶rt; m ¶rt;u m(Rb, V, Cr, Ni). auaum n¶rt;¶rt;m um- m¶rt; a u -uaum;aumA a¶rt;ma a uum n, uaumB
a a ¶rt;aum, a¶rt;um u aam n m m¶rt;a. ¶rt;aum — u unnA — aamum uu ¶rt;au da¶rt;uamu mTh uU.
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