Shock effects in pegmatitic quartz from the Siljan ring structure, central Sweden
作者:
Jarmo Tamminen,
FransE. Wickman,
期刊:
Geologiska Föreningen i Stockholm Förhandlingar
(Taylor Available online 1980)
卷期:
Volume 102,
issue 3
页码: 275-278
ISSN:0016-786X
年代: 1980
DOI:10.1080/11035898009455171
出版商: Taylor & Francis Group
关键词: Astroblemes;cryptoexplosion features;impact features;shock metamorphism;shock waves;fracture cleavage;planar features;pegmatite;quartz;Siljan ring structure;Lower Palaeozoic;Brunnvasselbodarna;central Dalarna;central Sweden;N6102 N6102 E1449 E1449
数据来源: Taylor
摘要:
Shocked milky quartz from the core of a granite pegmatite occurs at Brunnvasselbodarna, about 10 km from the impact center of the Siljan ring structure. The quartz displays well-developed cleavage fractures dominantly parallel with {1011}, some of which are filled with secondary laumontite. Planar features are common, the most frequently observed are oriented parallel to {1013}, {1011}, {0001}, but {1012}, {1122}, {2131}, {2241} and {5161} are also observed. An estimate of the peak pressure of the shock wave in Brunnvasselbodarna gives ca. 16 GPa. This value is probably too high because the grain size of the pegmatite quartz is large compared to the quartz grains of the rocks for which the method used has been devised.
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