Auswirkungen der hydrothermalen Alteration und der Metamiktisierung auf die U-Th-Pb-Verteilung und die U-Pb-Isotopensystematik in Pyrochlor des Sokli Karbonatit-Komplex, N-Finnland
Pyrochlore is a common accessory mineral in granite pegmatites, nepheline syenites and carbonatites. Its ability to accomodate many different elements leads to a wide range of pyrochlore varieties. This is obvious for the U- and Th- contents. The Sokli carbonatite complex ist part of the Kola alkali...
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Publikationsserver der RWTH Aachen University
2006
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ftrwthaachenpubl:oai:publications.rwth-aachen.de:60849 2023-05-15T18:15:06+02:00 Auswirkungen der hydrothermalen Alteration und der Metamiktisierung auf die U-Th-Pb-Verteilung und die U-Pb-Isotopensystematik in Pyrochlor des Sokli Karbonatit-Komplex, N-Finnland Warnsloh, Jens M. Kramm, Ulrich DE 2006 https://publications.rwth-aachen.de/record/60849 https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-122537%22 ger ger Publikationsserver der RWTH Aachen University info:eu-repo/semantics/altIdentifier/urn/urn:nbn:de:hbz:82-opus-14848 https://publications.rwth-aachen.de/record/60849 https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-122537%22 info:eu-repo/semantics/openAccess Aachen : Publikationsserver der RWTH Aachen University VIII, 350 S. : Ill., graph. Darst., Kt. (2006). = Aachen, Techn. Hochsch., Diss., 2005 info:eu-repo/classification/ddc/550 Geowissenschaften Pyrochlor Sokli-Karbonatitkomplex U-Pb-Isotopensystematik Metamiktisierung hydrothermale Alteration pyrochlore metamictisation U-Pb-distribution info:eu-repo/semantics/doctoralThesis info:eu-repo/semantics/publishedVersion 2006 ftrwthaachenpubl 2022-06-30T20:08:42Z Pyrochlore is a common accessory mineral in granite pegmatites, nepheline syenites and carbonatites. Its ability to accomodate many different elements leads to a wide range of pyrochlore varieties. This is obvious for the U- and Th- contents. The Sokli carbonatite complex ist part of the Kola alkaline province (KAP) in the northern Baltic Shield. The complex ist situated in the area of Savukoski, Finish Lapland, close to the border to Russia. The emplacement age of 360 - 370 Ma falls in the range observerd for other complexes in KAP. The magmatic core was build up in three phases, two magmatic phases separated by a hydrothermal phase.Pyrochlore crystals of the Sokli carbonatite complex show a large chemical variation over the evolution of the magmatic stages, as well as in small rock samples within single stages. This is obvious for the U- and Th- contents. The pyrochlore crystals show a principle change in crystallinity caused by metamictisation due to high U- and Th- concentrations. These high concentrations make pyrochlore useful for age determinations, albeit the metamict state and its modified diffusibility for chemical elements can disturb this. The U- concentration decreases from the early stages of the magmatic evolution to the late stages, to be completely depleted in the last stage. The Th- concentration increases from the early stages until the middle stages, then it decrease to the late stages. Except pyrochlore of rocksample 387R170 all structural analyzed pyrochlor crystals show clear reflexes and present the cubic pyrochlore cell unit. During the structural analyses revealed for sample 387p1 no reflexes were detected, which demonstrates that the pyrochlore crystal lattice is fully broken down due to the metamictisation caused by the high U- content within a decay time of 370 Ma.The analyzed U-Pb-system of the unaltered metamict pyrochlore show no loss of those elements due to long term diffusion. The slightly over concordant U-Pb-ages show that pyrochlores of carbonatites of the northern Baltic ... Doctoral or Postdoctoral Thesis Savukoski Lapland RWTH Aachen University: RWTH Publications Kap ENVELOPE(23.567,23.567,65.533,65.533) Savukoski ENVELOPE(28.158,28.158,67.293,67.293) Small Rock ENVELOPE(-45.592,-45.592,-60.702,-60.702) |
institution |
Open Polar |
collection |
RWTH Aachen University: RWTH Publications |
op_collection_id |
ftrwthaachenpubl |
language |
German |
topic |
info:eu-repo/classification/ddc/550 Geowissenschaften Pyrochlor Sokli-Karbonatitkomplex U-Pb-Isotopensystematik Metamiktisierung hydrothermale Alteration pyrochlore metamictisation U-Pb-distribution |
spellingShingle |
info:eu-repo/classification/ddc/550 Geowissenschaften Pyrochlor Sokli-Karbonatitkomplex U-Pb-Isotopensystematik Metamiktisierung hydrothermale Alteration pyrochlore metamictisation U-Pb-distribution Warnsloh, Jens M. Auswirkungen der hydrothermalen Alteration und der Metamiktisierung auf die U-Th-Pb-Verteilung und die U-Pb-Isotopensystematik in Pyrochlor des Sokli Karbonatit-Komplex, N-Finnland |
topic_facet |
info:eu-repo/classification/ddc/550 Geowissenschaften Pyrochlor Sokli-Karbonatitkomplex U-Pb-Isotopensystematik Metamiktisierung hydrothermale Alteration pyrochlore metamictisation U-Pb-distribution |
description |
Pyrochlore is a common accessory mineral in granite pegmatites, nepheline syenites and carbonatites. Its ability to accomodate many different elements leads to a wide range of pyrochlore varieties. This is obvious for the U- and Th- contents. The Sokli carbonatite complex ist part of the Kola alkaline province (KAP) in the northern Baltic Shield. The complex ist situated in the area of Savukoski, Finish Lapland, close to the border to Russia. The emplacement age of 360 - 370 Ma falls in the range observerd for other complexes in KAP. The magmatic core was build up in three phases, two magmatic phases separated by a hydrothermal phase.Pyrochlore crystals of the Sokli carbonatite complex show a large chemical variation over the evolution of the magmatic stages, as well as in small rock samples within single stages. This is obvious for the U- and Th- contents. The pyrochlore crystals show a principle change in crystallinity caused by metamictisation due to high U- and Th- concentrations. These high concentrations make pyrochlore useful for age determinations, albeit the metamict state and its modified diffusibility for chemical elements can disturb this. The U- concentration decreases from the early stages of the magmatic evolution to the late stages, to be completely depleted in the last stage. The Th- concentration increases from the early stages until the middle stages, then it decrease to the late stages. Except pyrochlore of rocksample 387R170 all structural analyzed pyrochlor crystals show clear reflexes and present the cubic pyrochlore cell unit. During the structural analyses revealed for sample 387p1 no reflexes were detected, which demonstrates that the pyrochlore crystal lattice is fully broken down due to the metamictisation caused by the high U- content within a decay time of 370 Ma.The analyzed U-Pb-system of the unaltered metamict pyrochlore show no loss of those elements due to long term diffusion. The slightly over concordant U-Pb-ages show that pyrochlores of carbonatites of the northern Baltic ... |
author2 |
Kramm, Ulrich |
format |
Doctoral or Postdoctoral Thesis |
author |
Warnsloh, Jens M. |
author_facet |
Warnsloh, Jens M. |
author_sort |
Warnsloh, Jens M. |
title |
Auswirkungen der hydrothermalen Alteration und der Metamiktisierung auf die U-Th-Pb-Verteilung und die U-Pb-Isotopensystematik in Pyrochlor des Sokli Karbonatit-Komplex, N-Finnland |
title_short |
Auswirkungen der hydrothermalen Alteration und der Metamiktisierung auf die U-Th-Pb-Verteilung und die U-Pb-Isotopensystematik in Pyrochlor des Sokli Karbonatit-Komplex, N-Finnland |
title_full |
Auswirkungen der hydrothermalen Alteration und der Metamiktisierung auf die U-Th-Pb-Verteilung und die U-Pb-Isotopensystematik in Pyrochlor des Sokli Karbonatit-Komplex, N-Finnland |
title_fullStr |
Auswirkungen der hydrothermalen Alteration und der Metamiktisierung auf die U-Th-Pb-Verteilung und die U-Pb-Isotopensystematik in Pyrochlor des Sokli Karbonatit-Komplex, N-Finnland |
title_full_unstemmed |
Auswirkungen der hydrothermalen Alteration und der Metamiktisierung auf die U-Th-Pb-Verteilung und die U-Pb-Isotopensystematik in Pyrochlor des Sokli Karbonatit-Komplex, N-Finnland |
title_sort |
auswirkungen der hydrothermalen alteration und der metamiktisierung auf die u-th-pb-verteilung und die u-pb-isotopensystematik in pyrochlor des sokli karbonatit-komplex, n-finnland |
publisher |
Publikationsserver der RWTH Aachen University |
publishDate |
2006 |
url |
https://publications.rwth-aachen.de/record/60849 https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-122537%22 |
op_coverage |
DE |
long_lat |
ENVELOPE(23.567,23.567,65.533,65.533) ENVELOPE(28.158,28.158,67.293,67.293) ENVELOPE(-45.592,-45.592,-60.702,-60.702) |
geographic |
Kap Savukoski Small Rock |
geographic_facet |
Kap Savukoski Small Rock |
genre |
Savukoski Lapland |
genre_facet |
Savukoski Lapland |
op_source |
Aachen : Publikationsserver der RWTH Aachen University VIII, 350 S. : Ill., graph. Darst., Kt. (2006). = Aachen, Techn. Hochsch., Diss., 2005 |
op_relation |
info:eu-repo/semantics/altIdentifier/urn/urn:nbn:de:hbz:82-opus-14848 https://publications.rwth-aachen.de/record/60849 https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-122537%22 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766188166386024448 |