The Grønnedal–Ika carbonatite–syenite complex, South Greenland: carbonatite formation by liquid immiscibility
The Grønnedal-Ika complex is dominated by layered nepheline syenites which were intruded by a xenolithic syenite and a central plug of calcite to calcite–siderite carbonatite. Aegirine–augite, alkali feldspar and nepheline are the major mineral phases in the syenites, along with rare calcite. Temper...
Main Authors: | , , |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Published: |
2005
|
Subjects: | |
Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.534.3266 http://homepages.uni-tuebingen.de/wolfgang.siebel/pdffiles/halama_2005.pdf |
id |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.534.3266 |
---|---|
record_format |
openpolar |
spelling |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.534.3266 2023-05-15T16:29:02+02:00 The Grønnedal–Ika carbonatite–syenite complex, South Greenland: carbonatite formation by liquid immiscibility Ralf Halama Torsten Vennemann Wolfgang Siebel The Pennsylvania State University CiteSeerX Archives 2005 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.534.3266 http://homepages.uni-tuebingen.de/wolfgang.siebel/pdffiles/halama_2005.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.534.3266 http://homepages.uni-tuebingen.de/wolfgang.siebel/pdffiles/halama_2005.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://homepages.uni-tuebingen.de/wolfgang.siebel/pdffiles/halama_2005.pdf KEY WORDS alkaline magmatism carbonatite Gardar Province text 2005 ftciteseerx 2016-01-08T10:44:59Z The Grønnedal-Ika complex is dominated by layered nepheline syenites which were intruded by a xenolithic syenite and a central plug of calcite to calcite–siderite carbonatite. Aegirine–augite, alkali feldspar and nepheline are the major mineral phases in the syenites, along with rare calcite. Temperatures of 680–910C and silica activities of 028–043 were determined for the crystallization of the syenites on the basis of mineral equilibria. Oxygen fugacities, esti-mated using titanomagnetite compositions, were between 2 and 5 log units above the fayalite–magnetite–quartz buffer during the magmatic stage. Chondrite-normalized REE patterns of magmatic calcite in both carbonatites and syenites are characterized by REE enrichment (LaCN–YbCN 10–70). Calcite from the carbonatites has higher Ba (5490 ppm) and lower HREE concentrations than calcite from the syenites (54–106 ppm Ba). This is consistent with the behavior of these elements during separation of immiscible Text Greenland Unknown Greenland Grønnedal ENVELOPE(-48.104,-48.104,61.235,61.235) |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
topic |
KEY WORDS alkaline magmatism carbonatite Gardar Province |
spellingShingle |
KEY WORDS alkaline magmatism carbonatite Gardar Province Ralf Halama Torsten Vennemann Wolfgang Siebel The Grønnedal–Ika carbonatite–syenite complex, South Greenland: carbonatite formation by liquid immiscibility |
topic_facet |
KEY WORDS alkaline magmatism carbonatite Gardar Province |
description |
The Grønnedal-Ika complex is dominated by layered nepheline syenites which were intruded by a xenolithic syenite and a central plug of calcite to calcite–siderite carbonatite. Aegirine–augite, alkali feldspar and nepheline are the major mineral phases in the syenites, along with rare calcite. Temperatures of 680–910C and silica activities of 028–043 were determined for the crystallization of the syenites on the basis of mineral equilibria. Oxygen fugacities, esti-mated using titanomagnetite compositions, were between 2 and 5 log units above the fayalite–magnetite–quartz buffer during the magmatic stage. Chondrite-normalized REE patterns of magmatic calcite in both carbonatites and syenites are characterized by REE enrichment (LaCN–YbCN 10–70). Calcite from the carbonatites has higher Ba (5490 ppm) and lower HREE concentrations than calcite from the syenites (54–106 ppm Ba). This is consistent with the behavior of these elements during separation of immiscible |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Ralf Halama Torsten Vennemann Wolfgang Siebel |
author_facet |
Ralf Halama Torsten Vennemann Wolfgang Siebel |
author_sort |
Ralf Halama |
title |
The Grønnedal–Ika carbonatite–syenite complex, South Greenland: carbonatite formation by liquid immiscibility |
title_short |
The Grønnedal–Ika carbonatite–syenite complex, South Greenland: carbonatite formation by liquid immiscibility |
title_full |
The Grønnedal–Ika carbonatite–syenite complex, South Greenland: carbonatite formation by liquid immiscibility |
title_fullStr |
The Grønnedal–Ika carbonatite–syenite complex, South Greenland: carbonatite formation by liquid immiscibility |
title_full_unstemmed |
The Grønnedal–Ika carbonatite–syenite complex, South Greenland: carbonatite formation by liquid immiscibility |
title_sort |
grønnedal–ika carbonatite–syenite complex, south greenland: carbonatite formation by liquid immiscibility |
publishDate |
2005 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.534.3266 http://homepages.uni-tuebingen.de/wolfgang.siebel/pdffiles/halama_2005.pdf |
long_lat |
ENVELOPE(-48.104,-48.104,61.235,61.235) |
geographic |
Greenland Grønnedal |
geographic_facet |
Greenland Grønnedal |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
http://homepages.uni-tuebingen.de/wolfgang.siebel/pdffiles/halama_2005.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.534.3266 http://homepages.uni-tuebingen.de/wolfgang.siebel/pdffiles/halama_2005.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766018715501985792 |