Investigation on Deformation in Amphibole and Amphibole-Bearing Xenoliths from the Kimberlite Bearing Diatremes on the Colorado Plateau.
Final rept. 1 Apr 72-31 Jul 73,
LAMONT-DOHERTY GEOLOGICAL OBSERVATORY PALISADES N Y
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Amphibole from metagabbros from campello Monti, Novara Italy show ductile deformation as twinning on -1,0,1 similarly to experimentally deformed hornblende and tremolite. In nature the most common deformation of amphibole is of the brittle type. This study proves that ductile type of deformation is also possible in a natural environment. Undulatory extinction is common, twinning and deformation lamellae are extremely rare, and, as far as the author is aware, they have not been previously reported. Author
- Geology, Geochemistry and Mineralogy