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Cation disorder in shocked orthopyroxene.

R W Dundon, S S Hafner

Science (New York, N.Y.)

|November 5, 1971

Summary

This summary is machine-generated.

High pressure shock experiments reveal magnesium and iron disorder in Bamle enstatite at 1 megabar, indicating high temperatures. Lower pressures (≤450 kilobars) do not affect mineral structure.

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Area of Science:

Mineral Physics
Geochemistry
High-Pressure Science

Background:

Enstatite is a key mineral in understanding planetary interiors.
Shock waves provide a method to simulate extreme pressures and temperatures found in planetary impacts and interiors.

Purpose of the Study:

To investigate the cation distribution of magnesium and iron in Bamle enstatite under shock compression.
To determine the pressure and temperature conditions at which structural changes occur in enstatite.

Main Methods:

Shock compression experiments on Bamle enstatite.
Analysis of cation distribution using techniques like X-ray diffraction or spectroscopy (details not provided in abstract).

Main Results:

At 1 megabar shock pressure, magnesium and iron exhibit highly disordered distribution across M1 and M2 sites in Bamle enstatite.
This disordered state is consistent with an equilibrium distribution at temperatures exceeding 1000 degrees C.
Samples shocked at 450 kilobars or lower show no disturbance in cation distribution.

Conclusions:

Shock compression to 1 megabar significantly alters the cation ordering in enstatite, indicative of high-temperature equilibration.
Enstatite preserves its structural integrity under shock pressures up to 450 kilobars.