Experimental temperature cycling as a powerful tool to enlarge melt pools and crystals at magma storage conditions
International audience Experiments in high silica systems at temperatures close to the solidus often produce crystals and melt pools that are too small for in situ analysis. Oscillating the temperature during an experimental run speeds up recrystallization of magma by dissolving small and increasing...
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ftinsu:oai:HAL:hal-01772599v1 2023-10-09T21:46:37+02:00 Experimental temperature cycling as a powerful tool to enlarge melt pools and crystals at magma storage conditions Erdmann, Martin Koepke, Jurgen Institut für Mineralogie Hannover Leibniz Universität Hannover=Leibniz University Hannover Centre de Recherches Pétrographiques et Géochimiques (CRPG) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS) 2016-04-01 https://hal.univ-lorraine.fr/hal-01772599 https://doi.org/10.2138/am-2016-5398 en eng HAL CCSD Mineralogical Society of America info:eu-repo/semantics/altIdentifier/doi/10.2138/am-2016-5398 hal-01772599 https://hal.univ-lorraine.fr/hal-01772599 doi:10.2138/am-2016-5398 ISSN: 0003-004X EISSN: 1945-3027 The American Mineralogist https://hal.univ-lorraine.fr/hal-01772599 The American Mineralogist, 2016, 101 (4), pp.960 - 969. ⟨10.2138/am-2016-5398⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2016 ftinsu https://doi.org/10.2138/am-2016-5398 2023-09-13T16:33:17Z International audience Experiments in high silica systems at temperatures close to the solidus often produce crystals and melt pools that are too small for in situ analysis. Oscillating the temperature during an experimental run speeds up recrystallization of magma by dissolving small and increasing the size of larger crystals, dramatically changing the crystal size distribution. This principle of periodic heating and cooling, caused for example by repeated injection of hot magma, is also a potential acceleration for the formation of phenocrystic textures in natural rocks.Here we show that temperature cycling has the potential to significantly enlarge melt pools and crystals in a fluid saturated dacitic system. Using a natural dacite dredged from the Pacific-Antarctic Rise as starting material, we performed crystallization experiments applying temperature cycling systematically for two different temperatures and different water activities at 200 MPa. For experiments at 950 °C (with aH2O ~1, ~0.3, and <0.1) an internally heated pressure vessel was used, experiments at 800 °C (with aH2O ~1, ~0.5) were performed in a cold-seal pressure vessel. Comparative experiments at equilibrium conditions with constant temperature were performed for both approaches. For all other experiments temperature was cycled with amplitudes of 20 K for different time intervals but constant total run duration after initial equilibration at constant temperature. Additionally, for one experiment at 800 °C, the temperature was increased several times by 50 K to study the potential of dissolving tiny crystals in the matrix.As a result of the temperature cycling, tiny crystals in the matrix were preferentially dissolved, leading to large melt pools with only rare mineral inclusions enabling microprobe analysis using a defocused beam. With regard to the area of the 10 largest crystals of each cycling experiment, clinopyroxene crystals were up to 19 times larger, and plagioclase crystals even up to 69 times when comparing to experiments ... Article in Journal/Newspaper Antarc* Antarctic Institut national des sciences de l'Univers: HAL-INSU Antarctic Pacific American Mineralogist 101 4 960 969 |
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Open Polar |
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Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
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[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Erdmann, Martin Koepke, Jurgen Experimental temperature cycling as a powerful tool to enlarge melt pools and crystals at magma storage conditions |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Experiments in high silica systems at temperatures close to the solidus often produce crystals and melt pools that are too small for in situ analysis. Oscillating the temperature during an experimental run speeds up recrystallization of magma by dissolving small and increasing the size of larger crystals, dramatically changing the crystal size distribution. This principle of periodic heating and cooling, caused for example by repeated injection of hot magma, is also a potential acceleration for the formation of phenocrystic textures in natural rocks.Here we show that temperature cycling has the potential to significantly enlarge melt pools and crystals in a fluid saturated dacitic system. Using a natural dacite dredged from the Pacific-Antarctic Rise as starting material, we performed crystallization experiments applying temperature cycling systematically for two different temperatures and different water activities at 200 MPa. For experiments at 950 °C (with aH2O ~1, ~0.3, and <0.1) an internally heated pressure vessel was used, experiments at 800 °C (with aH2O ~1, ~0.5) were performed in a cold-seal pressure vessel. Comparative experiments at equilibrium conditions with constant temperature were performed for both approaches. For all other experiments temperature was cycled with amplitudes of 20 K for different time intervals but constant total run duration after initial equilibration at constant temperature. Additionally, for one experiment at 800 °C, the temperature was increased several times by 50 K to study the potential of dissolving tiny crystals in the matrix.As a result of the temperature cycling, tiny crystals in the matrix were preferentially dissolved, leading to large melt pools with only rare mineral inclusions enabling microprobe analysis using a defocused beam. With regard to the area of the 10 largest crystals of each cycling experiment, clinopyroxene crystals were up to 19 times larger, and plagioclase crystals even up to 69 times when comparing to experiments ... |
author2 |
Institut für Mineralogie Hannover Leibniz Universität Hannover=Leibniz University Hannover Centre de Recherches Pétrographiques et Géochimiques (CRPG) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Erdmann, Martin Koepke, Jurgen |
author_facet |
Erdmann, Martin Koepke, Jurgen |
author_sort |
Erdmann, Martin |
title |
Experimental temperature cycling as a powerful tool to enlarge melt pools and crystals at magma storage conditions |
title_short |
Experimental temperature cycling as a powerful tool to enlarge melt pools and crystals at magma storage conditions |
title_full |
Experimental temperature cycling as a powerful tool to enlarge melt pools and crystals at magma storage conditions |
title_fullStr |
Experimental temperature cycling as a powerful tool to enlarge melt pools and crystals at magma storage conditions |
title_full_unstemmed |
Experimental temperature cycling as a powerful tool to enlarge melt pools and crystals at magma storage conditions |
title_sort |
experimental temperature cycling as a powerful tool to enlarge melt pools and crystals at magma storage conditions |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal.univ-lorraine.fr/hal-01772599 https://doi.org/10.2138/am-2016-5398 |
geographic |
Antarctic Pacific |
geographic_facet |
Antarctic Pacific |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
ISSN: 0003-004X EISSN: 1945-3027 The American Mineralogist https://hal.univ-lorraine.fr/hal-01772599 The American Mineralogist, 2016, 101 (4), pp.960 - 969. ⟨10.2138/am-2016-5398⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.2138/am-2016-5398 hal-01772599 https://hal.univ-lorraine.fr/hal-01772599 doi:10.2138/am-2016-5398 |
op_doi |
https://doi.org/10.2138/am-2016-5398 |
container_title |
American Mineralogist |
container_volume |
101 |
container_issue |
4 |
container_start_page |
960 |
op_container_end_page |
969 |
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1779322353564516352 |