Conversion of nepheline to sodalite during subsolidus processes in alkaline rocks
Cathodoluminescence (CL) petrography of nepheline syenites of the Igaliko complex, Gardar province, South Greenland shows that sodalites possess embayed contacts against nepheline, and have formed by a process of metasomatic replacement. This texture is demonstrated clearly by CL, since sodalite lum...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.604.8321 2023-05-15T16:27:28+02:00 Conversion of nepheline to sodalite during subsolidus processes in alkaline rocks Adrian A. Finch The Pennsylvania State University CiteSeerX Archives 1991 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.604.8321 http://www.minersoc.org/pages/Archive-MM/Volume_55/55-380-459.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.604.8321 http://www.minersoc.org/pages/Archive-MM/Volume_55/55-380-459.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_55/55-380-459.pdf KEVWORDS feldspathoids cathodoluminescence microporosity Igaliko Gardar Greenland text 1991 ftciteseerx 2016-01-08T14:12:14Z Cathodoluminescence (CL) petrography of nepheline syenites of the Igaliko complex, Gardar province, South Greenland shows that sodalites possess embayed contacts against nepheline, and have formed by a process of metasomatic replacement. This texture is demonstrated clearly by CL, since sodalite luminesces bright orange and nepheline is poorly luminescent. The transformation from nepheline to sodalite results in a volume change which leads to a network of fractures in which deep-blue luminescent fluorite is precipitated. Fluorite is formed since the chlorination process involved in the transformation causes localised reductions of the salinity of the fluid and therefore adecrease in the solubility of fluorite. Sodalite-fluorite xtures observed using CL allow sodalites of secondary origin in alkaline igneous rocks to be identified. Nephelines and sodalites, when observed using scanning electron microscopy, possess small micropores. By analogy with recent work on alkali feldspars, pervasive alteration of nephelines may occur by fluid flow assisted by a permeable micropore network. Text Greenland Igaliko Unknown Greenland |
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language |
English |
topic |
KEVWORDS feldspathoids cathodoluminescence microporosity Igaliko Gardar Greenland |
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KEVWORDS feldspathoids cathodoluminescence microporosity Igaliko Gardar Greenland Adrian A. Finch Conversion of nepheline to sodalite during subsolidus processes in alkaline rocks |
topic_facet |
KEVWORDS feldspathoids cathodoluminescence microporosity Igaliko Gardar Greenland |
description |
Cathodoluminescence (CL) petrography of nepheline syenites of the Igaliko complex, Gardar province, South Greenland shows that sodalites possess embayed contacts against nepheline, and have formed by a process of metasomatic replacement. This texture is demonstrated clearly by CL, since sodalite luminesces bright orange and nepheline is poorly luminescent. The transformation from nepheline to sodalite results in a volume change which leads to a network of fractures in which deep-blue luminescent fluorite is precipitated. Fluorite is formed since the chlorination process involved in the transformation causes localised reductions of the salinity of the fluid and therefore adecrease in the solubility of fluorite. Sodalite-fluorite xtures observed using CL allow sodalites of secondary origin in alkaline igneous rocks to be identified. Nephelines and sodalites, when observed using scanning electron microscopy, possess small micropores. By analogy with recent work on alkali feldspars, pervasive alteration of nephelines may occur by fluid flow assisted by a permeable micropore network. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Adrian A. Finch |
author_facet |
Adrian A. Finch |
author_sort |
Adrian A. Finch |
title |
Conversion of nepheline to sodalite during subsolidus processes in alkaline rocks |
title_short |
Conversion of nepheline to sodalite during subsolidus processes in alkaline rocks |
title_full |
Conversion of nepheline to sodalite during subsolidus processes in alkaline rocks |
title_fullStr |
Conversion of nepheline to sodalite during subsolidus processes in alkaline rocks |
title_full_unstemmed |
Conversion of nepheline to sodalite during subsolidus processes in alkaline rocks |
title_sort |
conversion of nepheline to sodalite during subsolidus processes in alkaline rocks |
publishDate |
1991 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.604.8321 http://www.minersoc.org/pages/Archive-MM/Volume_55/55-380-459.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Igaliko |
genre_facet |
Greenland Igaliko |
op_source |
http://www.minersoc.org/pages/Archive-MM/Volume_55/55-380-459.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.604.8321 http://www.minersoc.org/pages/Archive-MM/Volume_55/55-380-459.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766016642490302464 |