scholarly journals Low-Temperature Chlorite Geothermometry and Related Recent Analytical Advances: A Review

Minerals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 130
Author(s):  
Franck Bourdelle
Keyword(s):  
Solid Solution ◽  
Chemical Composition ◽  
Low Temperature ◽  
Ferric Iron ◽  
Hydrothermal Systems ◽  
Empirical Models ◽  
Temperature Application ◽  
Water Equilibrium ◽  
Semi Empirical ◽  
Molecular Solid

Chlorite, a 2:1:1 phyllosilicate, has all the required attributes to form the basis of a geothermometer: this mineral is ubiquitous in metamorphic, diagenetic, and hydrothermal systems with a broad field of stability and a chemical composition partly dependent on temperature (T) and pressure (P) conditions. These properties led to the development of a multitude of chlorite thermometers, ranging from those based on empirical calibrations (linking T to AlIV content) to thermodynamic or semi-empirical models (linking T to chlorite + quartz + water equilibrium constant). This present study provides an overview of these geothermometers proposed in the literature for low-temperature chlorite (T < 350 °C), specifying the advantages and limitations of each method. Recent analytical developments that allow for circumventing or responding to certain criticisms regarding the low-temperature application of thermometers are also presented. The emphasis is on micrometric and nanometric analysis, highlighting chemical intracrystalline zoning—which can be considered as evidence of a succession of local equilibria justifying a thermometric approach—and mapping ferric iron content. New perspectives in terms of analysis (e.g., Mn redox in Mn-chlorite) and geothermometer (molecular solid-solution model, oxychlorite end-member) are also addressed.

scholarly journals Formation of Intermediate Phases and Supersaturated Solid Solution in Al-Cu System during Diffusion

2018 ◽  
Vol 383 ◽  
pp. 31-35 ◽  
Author(s):  
Alexey Rodin ◽  
Nataliya Goreslavets
Keyword(s):  
Phase Diagram ◽  
Solid Solution ◽  
High Temperature ◽  
Chemical Composition ◽  
Low Temperature ◽  
Supersaturated Solid Solution ◽  
Diffusion Processes ◽  
Equilibrium Phase ◽  
Equilibrium Phase Diagram ◽  
Intermediate Phases

The study of diffusion processes in the aluminum - copper system was carried out at the temperature 350 and 520 °C. Special attention was paid on the chemical composition of the system near Al/Cu interface. It was determined that the intermediate phases in the system, corresponding to the equilibrium phase diagram, were not formed at low temperature. At high temperature the intermediate phases forms starting with Cu - rich phases. In both cases supersaturated solid solution of copper in aluminum could be observed near the interface.

Phase Equilibria in the System MgO-Al2O3-SiO2-H2O: Chlorites and Associated Minerals

1973 ◽  
Vol 39 (303) ◽  
pp. 297-312 ◽  
Author(s):  
Bruce Velde
Keyword(s):  
Solid Solution ◽  
Chemical Composition ◽  
Low Temperature ◽  
Phase Equilibria ◽  
Water Pressure ◽  
Positive Slope ◽  
Natural Mineral ◽  
Natural Minerals ◽  
Cell Dimensions ◽  
Mineral Assemblages

SummaryTwenty-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 Å and 14 Å 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 7Å → 4 Å 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 7Å aluminous chlorite is not stable with quartz or another silica phase.

Low temperature SR-XRPD study of åkermanite-gehlenite solid solution

2006 ◽  
Vol 2006 (suppl_23_2006) ◽  
pp. 419-424 ◽  
Author(s):  
M. Merlini ◽  
M. Gemmi ◽  
G. Artioli
Keyword(s):  
Solid Solution ◽  
Low Temperature

scholarly journals Low-temperature Synthesis of Nanometer-sized Single Crystals in MgO-ZnO Solid Solution

2002 ◽  
Vol 75 (7) ◽  
pp. 327-329 ◽  
Author(s):  
Seisaku OHSHIRO ◽  
Mitsunobu IWASAKI ◽  
Masayoshi HARA ◽  
Seishiro ITO
Keyword(s):  
Solid Solution ◽  
Low Temperature ◽  
Single Crystals ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis

Effect of Chemical Composition of Welding Wire and Low Temperature Steel Plate on the Weld Properties Made by SAW

2008 ◽  
Vol 580-582 ◽  
pp. 57-60
Author(s):  
Hee Joon Sung ◽  
Yeon Baeg Goo ◽  
Kyeong Ju Kim ◽  
Kee Young Choi
Keyword(s):  
Chemical Composition ◽  
Low Temperature ◽  
Weld Metal ◽  
Steel Plate ◽  
Butt Joint ◽  
Welding Wire ◽  
High Hardenability ◽  
Weld Metals ◽  
Weld Properties ◽  
Mo Content

Chemical composition effect on the weld properties for low temperature steel was evaluated. The alloy elements of interest at the weld metal were Cr and Mo, which come from the steel plate and welding wire, respectively. Both side one run SAW process was carried out in a Ygroove butt joint. Microstructure of the weld metal is strongly dependent on the chemical composition of the steel plate and the welding wire, due to high dilution. The microstructure of the weld metal became fine acicular ferrite by increasing Cr and Mo content because of high hardenability effect. The weld metal having Cr and Mo possessed the highest impact toughness at low temperatures among the weld metals studied. Cr seems to have more effect than Mo on the toughness of the weld metal.

Sign in / Sign up

Export Citation Format

Share Document