Thermal history of impact melt rocks in the Fennoscandian shield

Details Thermal history of impact melt rocks in the Fennoscandian shield Thermal history of impact melt rocks in the Fennoscandian shield

Jun 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975comp...50..145c&link_type=abstract

Contributions to Mineralogy and Petrology, Volume 50, Issue 2, pp.145-155

Computer Science

25

Scientific paper

Shock-melted rocks from the Fennoscandian shield commonly contain fragments of quartz which appear to represent paramorphs of quartz after lechatelierite and, therefore indicate very high melt temperatures, at or above 1700 °C. The presence of melt (glass) inclusions containing shrinkage bubbles in plagioclase microphenocrysts shows that the growth of this mineral took place in a fluid melt above the glass-transition temperature which in the glass from Dellen is estimated to approximately 900 °C. The morphology of plagioclase suggests that crystallization occurred at moderate degrees of supercooling and was similar to the crystallization history of melts derived by endogenous processes. Plagioclase growth in trapped melt inclusions resulted in reverse compositional zoning. Devitrification, i.e. crystallization below the glass-transition temperature, usually occurred by the formation of alkali feldspar spheralites.

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