Cr-spinel records metasomatism not petrogenesis of mantle rocks
Mantle melts provide a window on processes related to global plate tectonics. The composition of chromian spinel (Cr-spinel) from mafic-ultramafic rocks has been widely used for tracing the geotectonic environments, the degree of mantle melting and the rate of mid-ocean ridge spreading. The assumpti...
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Journal Article |
| Language: | English |
| Published: |
NATURE PUBLISHING GROUP
2019
|
| Subjects: | |
| Online Access: | http://purl.org/au-research/grants/arc/FL150100133 http://hdl.handle.net/20.500.11937/79360 |
| _version_ | 1848764037437849600 |
|---|---|
| author | Gamal El Dien, H. Arai, S. Doucet, L.S. Li, Zheng-Xiang Kil, Y. Fougerouse, Denis Reddy, Steven Saxey, David Hamdy, M. |
| author_facet | Gamal El Dien, H. Arai, S. Doucet, L.S. Li, Zheng-Xiang Kil, Y. Fougerouse, Denis Reddy, Steven Saxey, David Hamdy, M. |
| author_sort | Gamal El Dien, H. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Mantle melts provide a window on processes related to global plate tectonics. The composition of chromian spinel (Cr-spinel) from mafic-ultramafic rocks has been widely used for tracing the geotectonic environments, the degree of mantle melting and the rate of mid-ocean ridge spreading. The assumption is that Cr-spinel’s core composition (Cr# = Cr/(Cr + Al)) is homogenous, insensitive to post-formation modification and therefore a robust petrogenetic indicator. However, we demonstrate that the composition of Cr-spinel can be modified by fluid/melt-rock interactions in both sub-arc and sub-mid oceanic mantle. Metasomatism can produce Al-Cr heterogeneity in Cr-spinel that lowers the Cr/Al ratio, and therefore modifies the Cr#, making Cr# ineffective as a geotectonic and mantle melting indicator. Our analysis also demonstrates that Cr-spinel is a potential sink for fluid-mobile elements, especially in subduction zone environments. The heterogeneity of Cr# in Cr-spinel can, therefore, be used as an excellent tracer for metasomatic processes. |
| first_indexed | 2025-11-14T11:12:59Z |
| format | Journal Article |
| id | curtin-20.500.11937-79360 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:12:59Z |
| publishDate | 2019 |
| publisher | NATURE PUBLISHING GROUP |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-793602022-11-23T05:55:14Z Cr-spinel records metasomatism not petrogenesis of mantle rocks Gamal El Dien, H. Arai, S. Doucet, L.S. Li, Zheng-Xiang Kil, Y. Fougerouse, Denis Reddy, Steven Saxey, David Hamdy, M. Science & Technology Multidisciplinary Sciences Science & Technology - Other Topics MID-ATLANTIC RIDGE ANDESITIC AVACHA VOLCANO MARIANA FORE-ARC PERIDOTITE XENOLITHS SERPENTINIZED PERIDOTITES ABYSSAL PERIDOTITES SPREADING RIDGE EASTERN DESERT WEDGE BENEATH KAMCHATKA ARC Mantle melts provide a window on processes related to global plate tectonics. The composition of chromian spinel (Cr-spinel) from mafic-ultramafic rocks has been widely used for tracing the geotectonic environments, the degree of mantle melting and the rate of mid-ocean ridge spreading. The assumption is that Cr-spinel’s core composition (Cr# = Cr/(Cr + Al)) is homogenous, insensitive to post-formation modification and therefore a robust petrogenetic indicator. However, we demonstrate that the composition of Cr-spinel can be modified by fluid/melt-rock interactions in both sub-arc and sub-mid oceanic mantle. Metasomatism can produce Al-Cr heterogeneity in Cr-spinel that lowers the Cr/Al ratio, and therefore modifies the Cr#, making Cr# ineffective as a geotectonic and mantle melting indicator. Our analysis also demonstrates that Cr-spinel is a potential sink for fluid-mobile elements, especially in subduction zone environments. The heterogeneity of Cr# in Cr-spinel can, therefore, be used as an excellent tracer for metasomatic processes. 2019 Journal Article http://hdl.handle.net/20.500.11937/79360 10.1038/s41467-019-13117-1 English http://purl.org/au-research/grants/arc/FL150100133 http://creativecommons.org/licenses/by/4.0/ NATURE PUBLISHING GROUP fulltext |
| spellingShingle | Science & Technology Multidisciplinary Sciences Science & Technology - Other Topics MID-ATLANTIC RIDGE ANDESITIC AVACHA VOLCANO MARIANA FORE-ARC PERIDOTITE XENOLITHS SERPENTINIZED PERIDOTITES ABYSSAL PERIDOTITES SPREADING RIDGE EASTERN DESERT WEDGE BENEATH KAMCHATKA ARC Gamal El Dien, H. Arai, S. Doucet, L.S. Li, Zheng-Xiang Kil, Y. Fougerouse, Denis Reddy, Steven Saxey, David Hamdy, M. Cr-spinel records metasomatism not petrogenesis of mantle rocks |
| title | Cr-spinel records metasomatism not petrogenesis of mantle rocks |
| title_full | Cr-spinel records metasomatism not petrogenesis of mantle rocks |
| title_fullStr | Cr-spinel records metasomatism not petrogenesis of mantle rocks |
| title_full_unstemmed | Cr-spinel records metasomatism not petrogenesis of mantle rocks |
| title_short | Cr-spinel records metasomatism not petrogenesis of mantle rocks |
| title_sort | cr-spinel records metasomatism not petrogenesis of mantle rocks |
| topic | Science & Technology Multidisciplinary Sciences Science & Technology - Other Topics MID-ATLANTIC RIDGE ANDESITIC AVACHA VOLCANO MARIANA FORE-ARC PERIDOTITE XENOLITHS SERPENTINIZED PERIDOTITES ABYSSAL PERIDOTITES SPREADING RIDGE EASTERN DESERT WEDGE BENEATH KAMCHATKA ARC |
| url | http://purl.org/au-research/grants/arc/FL150100133 http://hdl.handle.net/20.500.11937/79360 |