Petrological modifications in granitic rocks from the Siljan impact structure: evidence from cathodoluminescence.

Details Petrological modifications in granitic rocks from the Siljan impact structure: evidence from cathodoluminescence. Petrological modifications in granitic rocks from the Siljan impact structure: evidence from cathodoluminescence.

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992tectp.216..195r&link_type=abstract

Tectonophysics, Vol. 216, No. 1/2, p. 195 - 204

Physics

6

Scientific paper

Cathodoluminescence and microprobe analyses were performed on quartz, plagioclase and K-feldspar from granitic rocks in the Siljan impact area, central Sweden. In the upper 2200 m and in the vicinity of the Gravberg-1 well, secondary reddish luminescing quartz and brownish luminescing albite and K-feldspar are the dominant minerals. Primary magmatic quartz, plagioclases (oligoclase-andesine) and K-feldspar show blue, yellowish and bluish luminescence colours, respectively. The reddish luminescence colour of quartz is interpreted to have been induced by the shock heating episode of the impact and subsequent elevated temperature in the granites.

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