Thermodynamic Analysis of Secondary Minerals Stability in Altered Carbonatites of the Oldoinyo Lengai Volcano, Northern Tanzania

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Thermodynamic Analysis of Secondary Minerals Stability in Altered Carbonatites of the Oldoinyo Lengai Volcano, Northern Tanzania. / Perova, E. N.; Zaitsev, A. N.

In: Geology of Ore Deposits, Vol. 59, No. 7, 01.12.2017, p. 584-591.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{0fad2362162545449add20d6be11e91c,

title = "Thermodynamic Analysis of Secondary Minerals Stability in Altered Carbonatites of the Oldoinyo Lengai Volcano, Northern Tanzania",

abstract = "Carbonatites from the Oldoinyo Lengai volcano, northern Tanzania, are unstable under normal atmospheric conditions. Owing to carbonatite interaction with water, the major minerals—gregoryite Na2(CO3), nyerereite Na2Ca(CO3)2, and sylvite KCl—are dissolved and replaced with secondary low-temperature minerals: thermonatrite Na2(CO3) · H2O, trona Na3(CO3)(HCO3) · 2H2O, nahcolite Na(HCO3), pirssonite Na2Ca(CO3)2 · 2H2O, calcite Ca(CO3), and shortite Na2Ca2(CO3)3. Thermodynamic calculations show that the formation of secondary minerals in Oldoinyo Lengai carbonatites are controlled by the pH of the pore solution, H2O and CO2 fugacity, and the ratio of Ca and Na activity in the Na2O–CaO–CO2–H2O system.",

keywords = "calcite, carbonatite, gregoryite, low-temperature alteration, nyerereite, Oldoinyo Lengai volcano, pirssonite",

author = "Perova, {E. N.} and Zaitsev, {A. N.}",

year = "2017",

month = dec,

day = "1",

doi = "10.1134/S1075701517070091",

language = "English",

volume = "59",

pages = "584--591",

journal = "Geology of Ore Deposits",

issn = "1075-7015",

publisher = "МАИК {"}Наука/Интерпериодика{"}",

number = "7",

}

RIS

TY - JOUR

T1 - Thermodynamic Analysis of Secondary Minerals Stability in Altered Carbonatites of the Oldoinyo Lengai Volcano, Northern Tanzania

AU - Perova, E. N.

AU - Zaitsev, A. N.

PY - 2017/12/1

Y1 - 2017/12/1

N2 - Carbonatites from the Oldoinyo Lengai volcano, northern Tanzania, are unstable under normal atmospheric conditions. Owing to carbonatite interaction with water, the major minerals—gregoryite Na2(CO3), nyerereite Na2Ca(CO3)2, and sylvite KCl—are dissolved and replaced with secondary low-temperature minerals: thermonatrite Na2(CO3) · H2O, trona Na3(CO3)(HCO3) · 2H2O, nahcolite Na(HCO3), pirssonite Na2Ca(CO3)2 · 2H2O, calcite Ca(CO3), and shortite Na2Ca2(CO3)3. Thermodynamic calculations show that the formation of secondary minerals in Oldoinyo Lengai carbonatites are controlled by the pH of the pore solution, H2O and CO2 fugacity, and the ratio of Ca and Na activity in the Na2O–CaO–CO2–H2O system.

AB - Carbonatites from the Oldoinyo Lengai volcano, northern Tanzania, are unstable under normal atmospheric conditions. Owing to carbonatite interaction with water, the major minerals—gregoryite Na2(CO3), nyerereite Na2Ca(CO3)2, and sylvite KCl—are dissolved and replaced with secondary low-temperature minerals: thermonatrite Na2(CO3) · H2O, trona Na3(CO3)(HCO3) · 2H2O, nahcolite Na(HCO3), pirssonite Na2Ca(CO3)2 · 2H2O, calcite Ca(CO3), and shortite Na2Ca2(CO3)3. Thermodynamic calculations show that the formation of secondary minerals in Oldoinyo Lengai carbonatites are controlled by the pH of the pore solution, H2O and CO2 fugacity, and the ratio of Ca and Na activity in the Na2O–CaO–CO2–H2O system.

KW - calcite

KW - carbonatite

KW - gregoryite

KW - low-temperature alteration

KW - nyerereite

KW - Oldoinyo Lengai volcano

KW - pirssonite

UR - http://www.scopus.com/inward/record.url?scp=85042659528&partnerID=8YFLogxK

U2 - 10.1134/S1075701517070091

DO - 10.1134/S1075701517070091

M3 - Article

AN - SCOPUS:85042659528

VL - 59

SP - 584

EP - 591

JO - Geology of Ore Deposits

JF - Geology of Ore Deposits

SN - 1075-7015

IS - 7

ER -

ID: 28660213