Stearns Morse's Basalts and Phase Diagrams: An Introduction to the PDF

By Stearns Morse

A ebook on part diagrams in igneous petrology, with the early elements of the chapters being hassle-free and the later elements being complex. themes variety from uncomplicated structures corresponding to Anorthite-Albite to extra complex fabric akin to an advent to Schreinemakers' ideas.

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Additional info for Basalts and Phase Diagrams: An Introduction to the Quantitative Use of Phase Diagrams in Igneous Petrology

Example text

It is more compressible, less rigid, and less dense than liquid. At temperatures and pressures below a certain value called the critical point, vapor and liquid form an interface with each other. At a given pressure below the critical point, a liquid passes into a vapor (boils) at a fixed value of temperature. Above the pressure of the critical point, liquid passes continuously into vapor with rising temperature, by becoming more and more disordered and less and less dense, so that the distinction between liquid and vapor fades above the critical point.

The quenching methoda utilizes the fact that most silicate liquids can be converted to a glass by abrupt cooling (quenching). In the quenching method, a small ~ount (such as 10 mg) of crystalline diopside is wrapped in an envelope of platinum foil and suspended in a vertical-tube furnace by a fine platinum wire. A thermocouple is suspended beside the envelope, furnishing the temperature of the experiment. Mter heating at constant temperature for an hour or so, an electric current is applied to melt the platinum suspension wire, and the platinum envelope with its diopside charge falls into a dish of mercury, cooling to nearly room temperature in a few seconds.

A working knowledge of the phase rule is essential for the effective use of phase diagrams. Such a working knowledge is very simple to acquire, since the phase rule is a very simple statement about the relationships of three variables. Like many rules, the phase rule conceals in its simplicity a very subtle, brilliant, and powerful chain of logical reasoning, and it is possible, perhaps even desirable for advanced students, to analyze phase diagrams from first principles without using the rule as a crutch.

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