TY - JOUR
T1 - Effects of brine compositions and crystal structures on mica alteration under acidic hydrothermal conditions
AU - Hu, Yandi
AU - Jun, Young Shin
PY - 2011
Y1 - 2011
N2 - To study mica alteration under various geologic CO 2 sequestration (GCS) conditions, batch dissolution experiments were conducted with biotite and muscovite at 95°C and under 102 atm CO 2, in water, NaCl, MgCl 2, and CaCl 2 solutions with varied concentrations. Experimental periods ranged from 22 h to 6 days. K + dissolution from biotite was significantly accelerated in these saline solutions than in water through ion-exchange, which also accelerated the dissolution of all framework ions (Mg, Fe, Al, and Si). Among the saline solutions with the same ionic strength, biotite dissolution rate followed the order CaCl 2 > MgCl 2 > NaCl. Macroscopic fibrous illite was observed on biotite basal surfaces after reaction in the saline solutions. Muscovite dissolved much slower than biotite, especially for K +, and much less fibrous illite formed on muscovite. This study illuminates the effects of brine compositions and mineral structures on simultaneous mica dissolution and secondary mineral precipitation under acidic hydrothermal conditions.
AB - To study mica alteration under various geologic CO 2 sequestration (GCS) conditions, batch dissolution experiments were conducted with biotite and muscovite at 95°C and under 102 atm CO 2, in water, NaCl, MgCl 2, and CaCl 2 solutions with varied concentrations. Experimental periods ranged from 22 h to 6 days. K + dissolution from biotite was significantly accelerated in these saline solutions than in water through ion-exchange, which also accelerated the dissolution of all framework ions (Mg, Fe, Al, and Si). Among the saline solutions with the same ionic strength, biotite dissolution rate followed the order CaCl 2 > MgCl 2 > NaCl. Macroscopic fibrous illite was observed on biotite basal surfaces after reaction in the saline solutions. Muscovite dissolved much slower than biotite, especially for K +, and much less fibrous illite formed on muscovite. This study illuminates the effects of brine compositions and mineral structures on simultaneous mica dissolution and secondary mineral precipitation under acidic hydrothermal conditions.
UR - https://www.scopus.com/pages/publications/84861039634
M3 - Conference article
AN - SCOPUS:84861039634
SN - 0065-7727
JO - ACS National Meeting Book of Abstracts
JF - ACS National Meeting Book of Abstracts
T2 - 242nd ACS National Meeting and Exposition
Y2 - 28 August 2011 through 1 September 2011
ER -