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Optical and Acoustic Detection of Ball Lightning (1971)

WAGNER, GÜNTHER A.

[s.l.] : Nature Publishing Group

Nature 232 (1971), S. 187-187

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ISSN: 1476-4687

Source: Nature Archives 1869 - 2009

Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics

Notes: [Auszug] This event occurred at approximately 11 a.m. in the entrance hall of the Plockenhaus, a restaurant below the Plockenpass in the Carnic Alps (Austria). Students from a field trip of the Geology Department of the Universitat Heidelberg were staying inside this restaurant because of a thunderstorm ...

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1038/232187a0

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Geochronology of high-pressure rocks on Sifnos (Cyclades, Greece) (1979)

Altherr, Rainer ; Schliestedt, Manfred ; Okrusch, Martin ; [et al.]

Springer

Contributions to mineralogy and petrology 70 (1979), S. 245-255

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ISSN: 1432-0967

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences

Notes: Abstract Polymetamorphic rocks of Sifnos (Greece) have been investigated by Rb-Sr, K-Ar, and fission track methods. Critical mineral assemblages from the northern and southernmost parts of Sifnos include jadeite+quartz+3T phengite, and omphacite+garnet +3T phengite, whereas the central part is characterized by the assemblage albite+chlorite+epidote+2M 1 phengite. K-Ar and Rb-Sr dates on phengites (predominantly 3T) of the best preserved high P/itTmetamorphic rocks from northern Sifnos gave concordant ages around 42 m.y., indicating a Late Lutetian age for the high P/T metamorphism. Phengites (2M 1+3T) of less preserved high P/T assemblages yielded K-Ar dates between 48 and 41 m.y. but generally lower Rb-Sr dates. The higher K-Ar dates are interpreted as being elevated by excess argon. K-Ar and Rb-Sr ages on 2M 1 phengites from central Sifnos vary between 24 and 21 m.y. These ages date a second, greenschist-facies metamorphism which overprinted the earlier high-pressure metamorphic rocks.