Stress orientation-dependent reactions during metamorphism
© 2019 Geological Society of America. Grain-scale pressure variations have been recognized as an important driver for the formation of distinct mineral assemblages during high- and ultrahigh-pressure metamorphism. However, the effects of differential stress acting during hydration of granulite remai...
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| Format: | Journal Article |
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Geological Society of America
2019
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| Online Access: | http://purl.org/au-research/grants/arc/DP160103449 http://hdl.handle.net/20.500.11937/74560 |
| _version_ | 1848763309673676800 |
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| author | Moore, J. Beinlich, Andreas Austrheim, H. Putnis, Andrew |
| author_facet | Moore, J. Beinlich, Andreas Austrheim, H. Putnis, Andrew |
| author_sort | Moore, J. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 2019 Geological Society of America. Grain-scale pressure variations have been recognized as an important driver for the formation of distinct mineral assemblages during high- and ultrahigh-pressure metamorphism. However, the effects of differential stress acting during hydration of granulite remain underexplored. Here, we present textural evidence for the orientation dependence of two distinct amphibolite-facies plagioclase grain boundary replacement assemblages that formed in response to differential stress during the early stage of lower-crustal hydration. The two assemblages, A1 (zoisite, kyanite, and quartz) and A2 (plagioclase and K-feldspar), are indicative of contemporaneous formation at local equilibrium conditions at ~700 °C and 1.1 GPa and 0.9 GPa, respectively. Mineral replacement was accompanied by minor redistribution of chemical components by the alteration fluid in response to the heterogeneous stress field and local equilibria. Thus, our observations provide new insight into the driving forces for pressure solution and indicate that differential stress and fluid-induced mass transfer may define the evolution of metamorphic assemblages. |
| first_indexed | 2025-11-14T11:01:25Z |
| format | Journal Article |
| id | curtin-20.500.11937-74560 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T11:01:25Z |
| publishDate | 2019 |
| publisher | Geological Society of America |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-745602023-06-07T04:20:57Z Stress orientation-dependent reactions during metamorphism Moore, J. Beinlich, Andreas Austrheim, H. Putnis, Andrew © 2019 Geological Society of America. Grain-scale pressure variations have been recognized as an important driver for the formation of distinct mineral assemblages during high- and ultrahigh-pressure metamorphism. However, the effects of differential stress acting during hydration of granulite remain underexplored. Here, we present textural evidence for the orientation dependence of two distinct amphibolite-facies plagioclase grain boundary replacement assemblages that formed in response to differential stress during the early stage of lower-crustal hydration. The two assemblages, A1 (zoisite, kyanite, and quartz) and A2 (plagioclase and K-feldspar), are indicative of contemporaneous formation at local equilibrium conditions at ~700 °C and 1.1 GPa and 0.9 GPa, respectively. Mineral replacement was accompanied by minor redistribution of chemical components by the alteration fluid in response to the heterogeneous stress field and local equilibria. Thus, our observations provide new insight into the driving forces for pressure solution and indicate that differential stress and fluid-induced mass transfer may define the evolution of metamorphic assemblages. 2019 Journal Article http://hdl.handle.net/20.500.11937/74560 10.1130/G45632.1 http://purl.org/au-research/grants/arc/DP160103449 Geological Society of America fulltext |
| spellingShingle | Moore, J. Beinlich, Andreas Austrheim, H. Putnis, Andrew Stress orientation-dependent reactions during metamorphism |
| title | Stress orientation-dependent reactions during metamorphism |
| title_full | Stress orientation-dependent reactions during metamorphism |
| title_fullStr | Stress orientation-dependent reactions during metamorphism |
| title_full_unstemmed | Stress orientation-dependent reactions during metamorphism |
| title_short | Stress orientation-dependent reactions during metamorphism |
| title_sort | stress orientation-dependent reactions during metamorphism |
| url | http://purl.org/au-research/grants/arc/DP160103449 http://hdl.handle.net/20.500.11937/74560 |