Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Thermodynamic analysis of stability of secondary minerals in altered carbonatites of the Oldoinyo Lengai volcano, Northern Tanzania. / Perova, E. N.; Zaitsev, A. N.
в: Zapiski Rossiiskogo Mineralogicheskogo Obshchestva, Том 145, № 3, 01.01.2016, стр. 1-13.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Thermodynamic analysis of stability of secondary minerals in altered carbonatites of the Oldoinyo Lengai volcano, Northern Tanzania
AU - Perova, E. N.
AU - Zaitsev, A. N.
PY - 2016/1/1
Y1 - 2016/1/1
N2 - Carbonatites from the Oldoinyo Lengai volcano, northern Tanzania, are unstable under normal atmospheric conditions. During carbonatite interaction with water the major minerals gregoryite Na 2 (CO 3 ), nyerereite Na 2 Ca(CO 3 )2 and sylvite KCl are dissolved and replaced by secondary low-temperature minerals thermonatrite Na 2 (CO 3 )·H 2 O, trona Na3(CO 3 )(HCO 3 )·2H 2 O, nahcolite Na(HCO 3 ), pirssonite Na 2 Ca(CO 3 )2 ·2H 2 O, calcite Ca(CO 3 ) and shortite Na 2 Ca 2 (CO 3 )3. Thermodynamic calculations show that the formation of secondary minerals within Oldoinyo Lengai carbonatites are controlled by pH of pore solution, H 2 O and CO 2 fugacity and the ratio of Ca and Na activities in the system Na 2 O-CaO-CO 2 -H 2 O.
AB - Carbonatites from the Oldoinyo Lengai volcano, northern Tanzania, are unstable under normal atmospheric conditions. During carbonatite interaction with water the major minerals gregoryite Na 2 (CO 3 ), nyerereite Na 2 Ca(CO 3 )2 and sylvite KCl are dissolved and replaced by secondary low-temperature minerals thermonatrite Na 2 (CO 3 )·H 2 O, trona Na3(CO 3 )(HCO 3 )·2H 2 O, nahcolite Na(HCO 3 ), pirssonite Na 2 Ca(CO 3 )2 ·2H 2 O, calcite Ca(CO 3 ) and shortite Na 2 Ca 2 (CO 3 )3. Thermodynamic calculations show that the formation of secondary minerals within Oldoinyo Lengai carbonatites are controlled by pH of pore solution, H 2 O and CO 2 fugacity and the ratio of Ca and Na activities in the system Na 2 O-CaO-CO 2 -H 2 O.
KW - Calcite
KW - Carbonatites
KW - Gregoryite
KW - Low-temperature alteration
KW - Nyerereite
KW - Oldoinyo Lengai volcano
KW - Pirssonite
UR - http://www.scopus.com/inward/record.url?scp=85019522893&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:85019522893
VL - 145
SP - 1
EP - 13
JO - ЗАПИСКИ РОССИЙСКОГО МИНЕРАЛОГИЧЕСКОГО ОБЩЕСТВА
JF - ЗАПИСКИ РОССИЙСКОГО МИНЕРАЛОГИЧЕСКОГО ОБЩЕСТВА
SN - 0869-6055
IS - 3
ER -
ID: 42298879