Pumpellyite-bearing Precambrian rocks and post-Svecokarelian regional metamorphism in central Sweden
作者:
JanOlov Nyström,
Beatriz Levi,
期刊:
Geologiska Föreningen i Stockholm Förhandlingar
(Taylor Available online 1980)
卷期:
Volume 102,
issue 1
页码: 37-39
ISSN:0016-786X
年代: 1980
DOI:10.1080/11035898009448589
出版商: Taylor & Francis Group
关键词: Pumpellyite;prehnite;sub-greenschist facies;low-grade metamorphism;prograde metamorphism;retrograde metamorphism;burial metamorphism;Upper Dala;Formation;sub-Jotnian;Jotnian;Svecokarelian;Precambrian;Älvdalen;Svärdsjö;Gävle;Granholmen;
数据来源: Taylor
摘要:
Pumpellyite-bearing mineral assemblages, formed during one or more episodes of non-deformational regional metamorphism, have been found in post-Svecokarelian rocks of central Sweden. Two different sub-greenschist facies have been established: the prehnite-pumpellyite and the pumpellyite-actinolite facies, in Jotnian and sub-Jotnian rocks respectively. It is here suggested that the common overprinting of post-deformational ‘retrograde’ minerals on amphibolite facies assemblages in Svecokarelian rocks of central Sweden could, at least in part, be attributed to the metamorphic episode(s) mentioned above. Furthermore, ‘deuteric’ minerals in granitoids of the same area could have the same origin.
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