Silicocarbonatitic Melt Inclusions in Fluorapatite from the Yates Prospect, Otter Lake, QuÉbec: Evidence of Marble Anatexis in the Central Metasedimentary Belt of the Grenville Province
We have investigated a locality very well known to mineral collectors, the Yates U-Th prospect near Otter Lake, Québec. There, dikes of orange to pink calcite enclose euhedral prisms of fluorapatite, locally aligned. Early investigators pointed out the importance of micro-inclusions in the prisms. W...
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Mineralogical Association of Canada (MAC)
2019
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Online Access: | https://oceanrep.geomar.de/id/eprint/47818/ https://oceanrep.geomar.de/id/eprint/47818/1/Schumann.pdf https://doi.org/10.3749/canmin.1900015 |
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ftoceanrep:oai:oceanrep.geomar.de:47818 2023-05-15T18:07:03+02:00 Silicocarbonatitic Melt Inclusions in Fluorapatite from the Yates Prospect, Otter Lake, QuÉbec: Evidence of Marble Anatexis in the Central Metasedimentary Belt of the Grenville Province Schumann, Dirk Martin, Robert F. Fuchs, Sebastian de Fourestier, Jeffrey 2019-09-30 text https://oceanrep.geomar.de/id/eprint/47818/ https://oceanrep.geomar.de/id/eprint/47818/1/Schumann.pdf https://doi.org/10.3749/canmin.1900015 en eng Mineralogical Association of Canada (MAC) https://oceanrep.geomar.de/id/eprint/47818/1/Schumann.pdf Schumann, D., Martin, R. F., Fuchs, S. and de Fourestier, J. (2019) Silicocarbonatitic Melt Inclusions in Fluorapatite from the Yates Prospect, Otter Lake, QuÉbec: Evidence of Marble Anatexis in the Central Metasedimentary Belt of the Grenville Province. The Canadian Mineralogist, 57 (5). pp. 583-604. DOI 10.3749/canmin.1900015 <https://doi.org/10.3749/canmin.1900015>. doi:10.3749/canmin.1900015 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2019 ftoceanrep https://doi.org/10.3749/canmin.1900015 2023-04-07T15:47:19Z We have investigated a locality very well known to mineral collectors, the Yates U-Th prospect near Otter Lake, Québec. There, dikes of orange to pink calcite enclose euhedral prisms of fluorapatite, locally aligned. Early investigators pointed out the importance of micro-inclusions in the prisms. We describe and image the micro-inclusions in two polished sections of fluorapatite prisms, one of them with a millimetric globule of orange calcite similar to that in the matrix. We interpret the globule to have been an inclusion of melt trapped during growth. Micro-globules disseminated in the fluorapatite are interpreted to have crystallized in situ from aliquots of the boundary-layer melt enriched in constituents rejected by the fluorapatite; the micro-globules contain a complex jigsawed assemblage of carbonate, silicate, and sulfate minerals. Early minerals to crystallize are commonly partly dissolved and partly replaced by lower-temperature phases. Such jigsawed assemblages seem to be absent in the carbonate matrix sampled away from the fluorapatite prisms. The pressure and temperature attained at the Rigolet stage of the Grenville collisional orogeny were conducive to the anatexis of marble in the presence of H2O. The carbonate melt is considered to have become silicocarbonatitic by assimilation of the enclosing gneisses, which were also close to their melting point. Degassing was important, and the melt froze quickly. The evidence points to a magmatic origin for the carbonate dikes and the associated clinopyroxenite, rather than a skarn-related association. Article in Journal/Newspaper Rigolet OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Rigolet ENVELOPE(-58.430,-58.430,54.180,54.180) The Canadian Mineralogist 57 5 583 604 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
We have investigated a locality very well known to mineral collectors, the Yates U-Th prospect near Otter Lake, Québec. There, dikes of orange to pink calcite enclose euhedral prisms of fluorapatite, locally aligned. Early investigators pointed out the importance of micro-inclusions in the prisms. We describe and image the micro-inclusions in two polished sections of fluorapatite prisms, one of them with a millimetric globule of orange calcite similar to that in the matrix. We interpret the globule to have been an inclusion of melt trapped during growth. Micro-globules disseminated in the fluorapatite are interpreted to have crystallized in situ from aliquots of the boundary-layer melt enriched in constituents rejected by the fluorapatite; the micro-globules contain a complex jigsawed assemblage of carbonate, silicate, and sulfate minerals. Early minerals to crystallize are commonly partly dissolved and partly replaced by lower-temperature phases. Such jigsawed assemblages seem to be absent in the carbonate matrix sampled away from the fluorapatite prisms. The pressure and temperature attained at the Rigolet stage of the Grenville collisional orogeny were conducive to the anatexis of marble in the presence of H2O. The carbonate melt is considered to have become silicocarbonatitic by assimilation of the enclosing gneisses, which were also close to their melting point. Degassing was important, and the melt froze quickly. The evidence points to a magmatic origin for the carbonate dikes and the associated clinopyroxenite, rather than a skarn-related association. |
format |
Article in Journal/Newspaper |
author |
Schumann, Dirk Martin, Robert F. Fuchs, Sebastian de Fourestier, Jeffrey |
spellingShingle |
Schumann, Dirk Martin, Robert F. Fuchs, Sebastian de Fourestier, Jeffrey Silicocarbonatitic Melt Inclusions in Fluorapatite from the Yates Prospect, Otter Lake, QuÉbec: Evidence of Marble Anatexis in the Central Metasedimentary Belt of the Grenville Province |
author_facet |
Schumann, Dirk Martin, Robert F. Fuchs, Sebastian de Fourestier, Jeffrey |
author_sort |
Schumann, Dirk |
title |
Silicocarbonatitic Melt Inclusions in Fluorapatite from the Yates Prospect, Otter Lake, QuÉbec: Evidence of Marble Anatexis in the Central Metasedimentary Belt of the Grenville Province |
title_short |
Silicocarbonatitic Melt Inclusions in Fluorapatite from the Yates Prospect, Otter Lake, QuÉbec: Evidence of Marble Anatexis in the Central Metasedimentary Belt of the Grenville Province |
title_full |
Silicocarbonatitic Melt Inclusions in Fluorapatite from the Yates Prospect, Otter Lake, QuÉbec: Evidence of Marble Anatexis in the Central Metasedimentary Belt of the Grenville Province |
title_fullStr |
Silicocarbonatitic Melt Inclusions in Fluorapatite from the Yates Prospect, Otter Lake, QuÉbec: Evidence of Marble Anatexis in the Central Metasedimentary Belt of the Grenville Province |
title_full_unstemmed |
Silicocarbonatitic Melt Inclusions in Fluorapatite from the Yates Prospect, Otter Lake, QuÉbec: Evidence of Marble Anatexis in the Central Metasedimentary Belt of the Grenville Province |
title_sort |
silicocarbonatitic melt inclusions in fluorapatite from the yates prospect, otter lake, québec: evidence of marble anatexis in the central metasedimentary belt of the grenville province |
publisher |
Mineralogical Association of Canada (MAC) |
publishDate |
2019 |
url |
https://oceanrep.geomar.de/id/eprint/47818/ https://oceanrep.geomar.de/id/eprint/47818/1/Schumann.pdf https://doi.org/10.3749/canmin.1900015 |
long_lat |
ENVELOPE(-58.430,-58.430,54.180,54.180) |
geographic |
Rigolet |
geographic_facet |
Rigolet |
genre |
Rigolet |
genre_facet |
Rigolet |
op_relation |
https://oceanrep.geomar.de/id/eprint/47818/1/Schumann.pdf Schumann, D., Martin, R. F., Fuchs, S. and de Fourestier, J. (2019) Silicocarbonatitic Melt Inclusions in Fluorapatite from the Yates Prospect, Otter Lake, QuÉbec: Evidence of Marble Anatexis in the Central Metasedimentary Belt of the Grenville Province. The Canadian Mineralogist, 57 (5). pp. 583-604. DOI 10.3749/canmin.1900015 <https://doi.org/10.3749/canmin.1900015>. doi:10.3749/canmin.1900015 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.3749/canmin.1900015 |
container_title |
The Canadian Mineralogist |
container_volume |
57 |
container_issue |
5 |
container_start_page |
583 |
op_container_end_page |
604 |
_version_ |
1766178957576634368 |