Exsolution during metamorphism with particular reference to feldspar solid solutions
SUMMARY. In the aureole of the syn-orogenic Hasvik Gabbro a variety of exsolution phenomena developed during the contact metamorphism. These exsolution phenomena have similar textures to those produced uring the age-hardening of metal alloys. In feldspars the exsolution precipitates are closely rela...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.624.2037 2023-05-15T16:33:47+02:00 Exsolution during metamorphism with particular reference to feldspar solid solutions Brian A. Sturt The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.624.2037 http://www.minersoc.org/pages/Archive-MM/Volume_37/37-291-815.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.624.2037 http://www.minersoc.org/pages/Archive-MM/Volume_37/37-291-815.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.minersoc.org/pages/Archive-MM/Volume_37/37-291-815.pdf text ftciteseerx 2016-01-08T15:08:41Z SUMMARY. In the aureole of the syn-orogenic Hasvik Gabbro a variety of exsolution phenomena developed during the contact metamorphism. These exsolution phenomena have similar textures to those produced uring the age-hardening of metal alloys. In feldspars the exsolution precipitates are closely related to the pattern of excesses over and deficiencies from the formula requirements, par-ticularly in terms of SiO ~ and A12Oa. The exsolution products are dependent upon both the tempera-tures of ageing and the details of the mineral chemistry. Evidence supporting an exsolution theory of origin for myrmekite is provided, and it is shown that precipitation from heterotype f ldspar solid solutions during metamorphism may in fact be a complex process involving a number of precipitate phases. The nucleation of sillimanite as a precipitate phase is discussed and it is shown how sillimanite develops at a number of distinctive sites within feldspar and garnet. From the textural relations of sillimanite precipitates and their host minerals a control exerted by the thermal stress configuration over the nucleation of precipitate phases is suggested. It is argued that the thermal stresses exerted across grain boundaries and within minerals during metamorphism may have considerable r levance to the interpretation ftextures in metamorphic rocks. Text Hasvik Unknown Hasvik ENVELOPE(22.161,22.161,70.486,70.486) |
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ftciteseerx |
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English |
description |
SUMMARY. In the aureole of the syn-orogenic Hasvik Gabbro a variety of exsolution phenomena developed during the contact metamorphism. These exsolution phenomena have similar textures to those produced uring the age-hardening of metal alloys. In feldspars the exsolution precipitates are closely related to the pattern of excesses over and deficiencies from the formula requirements, par-ticularly in terms of SiO ~ and A12Oa. The exsolution products are dependent upon both the tempera-tures of ageing and the details of the mineral chemistry. Evidence supporting an exsolution theory of origin for myrmekite is provided, and it is shown that precipitation from heterotype f ldspar solid solutions during metamorphism may in fact be a complex process involving a number of precipitate phases. The nucleation of sillimanite as a precipitate phase is discussed and it is shown how sillimanite develops at a number of distinctive sites within feldspar and garnet. From the textural relations of sillimanite precipitates and their host minerals a control exerted by the thermal stress configuration over the nucleation of precipitate phases is suggested. It is argued that the thermal stresses exerted across grain boundaries and within minerals during metamorphism may have considerable r levance to the interpretation ftextures in metamorphic rocks. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Brian A. Sturt |
spellingShingle |
Brian A. Sturt Exsolution during metamorphism with particular reference to feldspar solid solutions |
author_facet |
Brian A. Sturt |
author_sort |
Brian A. Sturt |
title |
Exsolution during metamorphism with particular reference to feldspar solid solutions |
title_short |
Exsolution during metamorphism with particular reference to feldspar solid solutions |
title_full |
Exsolution during metamorphism with particular reference to feldspar solid solutions |
title_fullStr |
Exsolution during metamorphism with particular reference to feldspar solid solutions |
title_full_unstemmed |
Exsolution during metamorphism with particular reference to feldspar solid solutions |
title_sort |
exsolution during metamorphism with particular reference to feldspar solid solutions |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.624.2037 http://www.minersoc.org/pages/Archive-MM/Volume_37/37-291-815.pdf |
long_lat |
ENVELOPE(22.161,22.161,70.486,70.486) |
geographic |
Hasvik |
geographic_facet |
Hasvik |
genre |
Hasvik |
genre_facet |
Hasvik |
op_source |
http://www.minersoc.org/pages/Archive-MM/Volume_37/37-291-815.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.624.2037 http://www.minersoc.org/pages/Archive-MM/Volume_37/37-291-815.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766023487038685184 |