Experimentally induced volumetric re-equilibration of plagioclase-hosted melt inclusions
The application of melt inclusions (MI) to infer magmatic processes assumes the MI have remained as constant mass, constant volume systems since the time of trapping. Understanding the effects of both compositional and volumetric re-equilibration is key for the interpretation of MI data. Although th...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2021
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| Online Access: | https://hdl.handle.net/10356/146830 |
| _version_ | 1826119191611047936 |
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| author | Drignon, Mélissa J. Arbaret, Laurent Cluzel, Nicolas Nielsen, Roger L. Bodnar, Robert J. |
| author2 | Asian School of the Environment |
| author_facet | Asian School of the Environment Drignon, Mélissa J. Arbaret, Laurent Cluzel, Nicolas Nielsen, Roger L. Bodnar, Robert J. |
| author_sort | Drignon, Mélissa J. |
| collection | NTU |
| description | The application of melt inclusions (MI) to infer magmatic processes assumes the MI have remained as constant mass, constant volume systems since the time of trapping. Understanding the effects of both compositional and volumetric re-equilibration is key for the interpretation of MI data. Although the re-equilibration behavior MI in quartz and olivine has been studied in some detail, the process is less understood for other MI host phases such as plagioclase, a common phase in igneous rocks. A MI can re-equilibrate when it experiences pressure and temperature (PT) conditions that differ from formation PT conditions. During laboratory heating, irreversible MI expansion may occur. As a result, the internal pressure within the MI decreases, resulting in chemical and structural changes to the MI and host. We present results of heating experiments on plagioclase-hosted MI designed to induce volumetric re-equilibration. The experiments consisted of incrementally heating the MI to temperatures above the homogenization temperatures. At ∼40°C above, the temperature at which the daughter minerals melted, irreversible volume expansion lowered the pressure in the MI, and led to exsolution of CO2 into vapor bubbles. With each additional few degrees of heating, additional episodes of CO2 exsolution, bubble nucleation and expansion of the vapor bubbles occurred. Re-equilibration of MI in plagioclase occurred through a combination of ductile and brittle deformation of the host surrounding the MI, whereas previous studies have shown that MI in olivine re-equilibrate dominantly through ductile deformation associated with movement along dislocations. This behavior is consistent with the differing rheological properties of these phases. |
| first_indexed | 2024-10-01T04:55:45Z |
| format | Journal Article |
| id | ntu-10356/146830 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:55:45Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1468302023-02-28T16:40:38Z Experimentally induced volumetric re-equilibration of plagioclase-hosted melt inclusions Drignon, Mélissa J. Arbaret, Laurent Cluzel, Nicolas Nielsen, Roger L. Bodnar, Robert J. Asian School of the Environment Science::Geology Bubble Nucleation and Coalescence Plagioclase‐hosted Melt Inclusions The application of melt inclusions (MI) to infer magmatic processes assumes the MI have remained as constant mass, constant volume systems since the time of trapping. Understanding the effects of both compositional and volumetric re-equilibration is key for the interpretation of MI data. Although the re-equilibration behavior MI in quartz and olivine has been studied in some detail, the process is less understood for other MI host phases such as plagioclase, a common phase in igneous rocks. A MI can re-equilibrate when it experiences pressure and temperature (PT) conditions that differ from formation PT conditions. During laboratory heating, irreversible MI expansion may occur. As a result, the internal pressure within the MI decreases, resulting in chemical and structural changes to the MI and host. We present results of heating experiments on plagioclase-hosted MI designed to induce volumetric re-equilibration. The experiments consisted of incrementally heating the MI to temperatures above the homogenization temperatures. At ∼40°C above, the temperature at which the daughter minerals melted, irreversible volume expansion lowered the pressure in the MI, and led to exsolution of CO2 into vapor bubbles. With each additional few degrees of heating, additional episodes of CO2 exsolution, bubble nucleation and expansion of the vapor bubbles occurred. Re-equilibration of MI in plagioclase occurred through a combination of ductile and brittle deformation of the host surrounding the MI, whereas previous studies have shown that MI in olivine re-equilibrate dominantly through ductile deformation associated with movement along dislocations. This behavior is consistent with the differing rheological properties of these phases. Published version 2021-03-12T01:44:31Z 2021-03-12T01:44:31Z 2020 Journal Article Drignon, M. J., Arbaret, L., Cluzel, N., Nielsen, R. L. & Bodnar, R. J. (2020). Experimentally induced volumetric re-equilibration of plagioclase-hosted melt inclusions. Geochemistry, Geophysics, Geosystems, 22(1). https://dx.doi.org/10.1029/2020GC009357 1525-2027 0000-0003-0978-4414 0000-0003-4904-9035 0000-0002-2171-8789 0000-0001-5042-8222 https://hdl.handle.net/10356/146830 10.1029/2020GC009357 2-s2.0-85099784683 1 22 en Geochemistry, Geophysics, Geosystems © 2020 American Geophysical Union. All rights reserved. This paper was published in Geochemistry, Geophysics, Geosystems and is made available with permission of American Geophysical Union. application/pdf |
| spellingShingle | Science::Geology Bubble Nucleation and Coalescence Plagioclase‐hosted Melt Inclusions Drignon, Mélissa J. Arbaret, Laurent Cluzel, Nicolas Nielsen, Roger L. Bodnar, Robert J. Experimentally induced volumetric re-equilibration of plagioclase-hosted melt inclusions |
| title | Experimentally induced volumetric re-equilibration of plagioclase-hosted melt inclusions |
| title_full | Experimentally induced volumetric re-equilibration of plagioclase-hosted melt inclusions |
| title_fullStr | Experimentally induced volumetric re-equilibration of plagioclase-hosted melt inclusions |
| title_full_unstemmed | Experimentally induced volumetric re-equilibration of plagioclase-hosted melt inclusions |
| title_short | Experimentally induced volumetric re-equilibration of plagioclase-hosted melt inclusions |
| title_sort | experimentally induced volumetric re equilibration of plagioclase hosted melt inclusions |
| topic | Science::Geology Bubble Nucleation and Coalescence Plagioclase‐hosted Melt Inclusions |
| url | https://hdl.handle.net/10356/146830 |
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