Journal ArticleDOI
Phase Equilibria in the System MgO-Al2O3-SiO2-H2O: Chlorites and Associated Minerals
Reads0
Chats0
TLDR
In this article, a simplified synthetic system of MgO-Al2O3-SiO2-H2O was investigated under conditions of 1 and 2 Kb water pressure and temperatures between 300 and 700°C.Abstract:
Twenty-six compositions in the system MgO-Al2O3-SiO2-H2O were investigated under conditions of 1 and 2 Kb water pressure and temperatures between 300 and 700°C. The solid solution for 7 A and 14 A chlorites has been delimited as well as that of the expanding phases (tri- and dioctahedral montmorillonites and expanding chlorites). Negative slopes were found for the transformation montmorillonite → expanding chlorite, and expanding chlorite → chlorite+quartz and a positive slope for 7A → 4 A transformation. The relative positions of the reactions chlorite+quartz → cordierite+talc, chlorite+andalusite → cordierite and chlorite+corundum → cordierite+spinel are located between 500 and 65°C. Cell dimensions of the synthetic chlorites can be correlated with their chemical composition. Solid solution in synthetic minerals compares well with 325 analysis of natural minerals from the literature, indicating that the chemiographic relations between phases in the simplified synthetic system are applicable to natural mineral assemblages. The phase relations indicate that at low temperature the 7A aluminous chlorite is not stable with quartz or another silica phase.read more
Citations
More filters
Journal ArticleDOI
Hydrothermally reset magmatic spinels in retrograde serpentinites: formation of “ferritchromit” rims and chlorite aureoles
TL;DR: In this paper, a transmission electron microscopic investigation showed that ferritchromit actually consists of a complex, nanometric association of Cr-magnetite (Mg0.03 Fe 0.97 Cr 0.89 Fe 3+ 1.00 O4), chlorite and lizardite, with (001)chl/liz always parallel to (111)Cr-mag.
Journal ArticleDOI
Transmission electron microscopic study of diagenetic chlorite in Gulf Coast argillaceous sediments
Jung Ho Ahn,Donald R. Peacor +1 more
TL;DR: In this paper, electron microscopy has been used to study diagenesis of the trioctahedral component of phyllosilicates (principally chlorite) in argillaceous core samples (depths of 1750, 2450, and 5500 m) from the Gulf Coast.
Journal ArticleDOI
Experimental study of the stability of sudoite and magnesiocarpholite and calculation of a new petrogenetic grid for the system FeO–MgO–Al2O3–SiO2–H2O
TL;DR: In this article, a petrogenetic grid for the system FeO-MgO-Al2O3-SiO2-H2O was computed using the partition coefficients calculated from natural parageneses.
Journal ArticleDOI
Experimental synthesis of chlorite from smectite at 300ºC in the presence of metallic Fe
Damien Guillaume,Alexander Neaman,Michel Cathelineau,Régine Mosser-Ruck,Chantal Peiffert,Mustapha Abdelmoula,Jean Dubessy,Frédéric Villiéras,Alain Baronnet,Nicolas Michau +9 more
TL;DR: In this paper, the alteration and transformation behavior of montmorillonite in low-salinity solutions (NaCl, CaCl 2 ) in the presence of metallic Fe and magnetite powder was studied in batch experiments at 300°C to simulate the mineralogical and chemical reactions of clays in contact with steel in a nuclear waste repository.
Journal ArticleDOI
Temperature — composition relationships of authigenic micaceous minerals in the Los Azufres geothermal system
Michel Cathelineau,G. Izquierdo +1 more
TL;DR: In this paper, changes in mineral assemblages and composition of phases are observed as a function of depth and host rock lithology in the Los Azufres geothermal system.
References
Related Papers (5)
Transmission electron microscopic study of diagenetic chlorite in Gulf Coast argillaceous sediments
Jung Ho Ahn,Donald R. Peacor +1 more