Implications for the genesis of phoscorite and carbonatite association
The phoscorite-carbonatite complex in the Sokli alkaline-carbonatite massif, northern Finland, comprises five stages of intrusions of phoscorites and carbonatites (P1-C1, P2-C2 and P3-C3 for phoscorites and calcite carbonatites; D4 and D5 for dolomite carbonatites). The phoscorites and calcite carbo...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.511.8860 2023-05-15T17:42:40+02:00 Implications for the genesis of phoscorite and carbonatite association Frances Wall Yeadong Kim The Pennsylvania State University CiteSeerX Archives 2004 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.511.8860 http://www.terrapub.co.jp/journals/GJ/pdf/4001/40010001.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.511.8860 http://www.terrapub.co.jp/journals/GJ/pdf/4001/40010001.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.terrapub.co.jp/journals/GJ/pdf/4001/40010001.pdf text 2004 ftciteseerx 2016-01-08T09:41:13Z The phoscorite-carbonatite complex in the Sokli alkaline-carbonatite massif, northern Finland, comprises five stages of intrusions of phoscorites and carbonatites (P1-C1, P2-C2 and P3-C3 for phoscorites and calcite carbonatites; D4 and D5 for dolomite carbonatites). The phoscorites and calcite carbonatites at Sokli usually occur as pairs with the same mineral assemblages. Pyrochlore is found in the majority of rock types in the Sokli phoscorite-carbonatite complex, shows wide compositional variation and seems to preserve evolution trends of host rocks. Crystallization of pyrochlore begins from the P2-C2 phoscorite and calcite carbonatite and continues up to the latest D5 dolomite carbonatite. Pyrochlore in the early stage P2-C2 rocks has high U and Ta contents. These elements suddenly decrease from the P3-C3 rocks, on the other hand, Th and Ce contents increase. The compositions of the late generations from the D4 and D5 rocks are close to that of an ideal end-member pyrochlore with formula (Ca,Na)2Nb2O6F. The Nb/Ta ratio and F content of pyrochlore increase from P2-C2 to the latest D5 dolomite carbonatite. The composition and evolutionary history of pyrochlore from the phoscorites are distinguished from those of the associated calcite carbonatites. Pyrochlore from the calcite carbonatites shows larger A-cation deficiencies compared to those from the paired phoscorites. Ta and Zr contents are slightly higher in pyrochlore from the calcite carbonatites, whereas Ti is generally higher in pyrochlore from the associated phoscorites. Text Northern Finland Unknown |
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The phoscorite-carbonatite complex in the Sokli alkaline-carbonatite massif, northern Finland, comprises five stages of intrusions of phoscorites and carbonatites (P1-C1, P2-C2 and P3-C3 for phoscorites and calcite carbonatites; D4 and D5 for dolomite carbonatites). The phoscorites and calcite carbonatites at Sokli usually occur as pairs with the same mineral assemblages. Pyrochlore is found in the majority of rock types in the Sokli phoscorite-carbonatite complex, shows wide compositional variation and seems to preserve evolution trends of host rocks. Crystallization of pyrochlore begins from the P2-C2 phoscorite and calcite carbonatite and continues up to the latest D5 dolomite carbonatite. Pyrochlore in the early stage P2-C2 rocks has high U and Ta contents. These elements suddenly decrease from the P3-C3 rocks, on the other hand, Th and Ce contents increase. The compositions of the late generations from the D4 and D5 rocks are close to that of an ideal end-member pyrochlore with formula (Ca,Na)2Nb2O6F. The Nb/Ta ratio and F content of pyrochlore increase from P2-C2 to the latest D5 dolomite carbonatite. The composition and evolutionary history of pyrochlore from the phoscorites are distinguished from those of the associated calcite carbonatites. Pyrochlore from the calcite carbonatites shows larger A-cation deficiencies compared to those from the paired phoscorites. Ta and Zr contents are slightly higher in pyrochlore from the calcite carbonatites, whereas Ti is generally higher in pyrochlore from the associated phoscorites. |
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The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Frances Wall Yeadong Kim |
spellingShingle |
Frances Wall Yeadong Kim Implications for the genesis of phoscorite and carbonatite association |
author_facet |
Frances Wall Yeadong Kim |
author_sort |
Frances Wall |
title |
Implications for the genesis of phoscorite and carbonatite association |
title_short |
Implications for the genesis of phoscorite and carbonatite association |
title_full |
Implications for the genesis of phoscorite and carbonatite association |
title_fullStr |
Implications for the genesis of phoscorite and carbonatite association |
title_full_unstemmed |
Implications for the genesis of phoscorite and carbonatite association |
title_sort |
implications for the genesis of phoscorite and carbonatite association |
publishDate |
2004 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.511.8860 http://www.terrapub.co.jp/journals/GJ/pdf/4001/40010001.pdf |
genre |
Northern Finland |
genre_facet |
Northern Finland |
op_source |
http://www.terrapub.co.jp/journals/GJ/pdf/4001/40010001.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.511.8860 http://www.terrapub.co.jp/journals/GJ/pdf/4001/40010001.pdf |
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