Extended Rift‐Associated Volcanism in Ganis Chasma, Venus Detected From Magellan Radar Emissivity
Abstract Exploration of Venus in the 1970–1990s revealed that the geology of Venus, the most Earth‐like of the terrestrial planets, was decidedly un‐Earth‐like, with no plate tectonics, and no record of the first 80% of its history. A major outstanding question is whether Venus is still volcanically...
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Wiley
2022-08-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2022GL099765 |
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| author | J. Brossier M. S. Gilmore J. W. Head |
| author_facet | J. Brossier M. S. Gilmore J. W. Head |
| author_sort | J. Brossier |
| collection | DOAJ |
| description | Abstract Exploration of Venus in the 1970–1990s revealed that the geology of Venus, the most Earth‐like of the terrestrial planets, was decidedly un‐Earth‐like, with no plate tectonics, and no record of the first 80% of its history. A major outstanding question is whether Venus is still volcanically active today. We find that regions of Ganis Chasma have low radar emissivity values, due to low volumes of high dielectric minerals formed by surface‐atmosphere weathering on the timescales of around 10 s Ma. This confirms the presence of geologically recent volcanism in association with this major tectonic rift zone. The spatial correspondence of this emissivity signature with transient thermal anomalies suggests that Venus has been volcanically active at this site for at least the last few decades, a prediction that can be tested with space missions to Venus in the coming decade. |
| format | Article |
| id | doaj-art-2ea69df39a124fc59ce987afd9012547 |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2022-08-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-2ea69df39a124fc59ce987afd90125472025-08-20T02:27:42ZengWileyGeophysical Research Letters0094-82761944-80072022-08-014915n/an/a10.1029/2022GL099765Extended Rift‐Associated Volcanism in Ganis Chasma, Venus Detected From Magellan Radar EmissivityJ. Brossier0M. S. Gilmore1J. W. Head2Institute for Space Astrophysics and Planetology IAPS National Institute of Astrophysics Rome ItalyDepartment of Earth and Environmental Sciences Planetary Sciences Group Wesleyan University Middletown CT USADepartment of Earth, Environmental and Planetary Sciences Brown University Providence RI USAAbstract Exploration of Venus in the 1970–1990s revealed that the geology of Venus, the most Earth‐like of the terrestrial planets, was decidedly un‐Earth‐like, with no plate tectonics, and no record of the first 80% of its history. A major outstanding question is whether Venus is still volcanically active today. We find that regions of Ganis Chasma have low radar emissivity values, due to low volumes of high dielectric minerals formed by surface‐atmosphere weathering on the timescales of around 10 s Ma. This confirms the presence of geologically recent volcanism in association with this major tectonic rift zone. The spatial correspondence of this emissivity signature with transient thermal anomalies suggests that Venus has been volcanically active at this site for at least the last few decades, a prediction that can be tested with space missions to Venus in the coming decade.https://doi.org/10.1029/2022GL099765VenusMagellanriftsmineralogyageGanis Chasma |
| spellingShingle | J. Brossier M. S. Gilmore J. W. Head Extended Rift‐Associated Volcanism in Ganis Chasma, Venus Detected From Magellan Radar Emissivity Geophysical Research Letters Venus Magellan rifts mineralogy age Ganis Chasma |
| title | Extended Rift‐Associated Volcanism in Ganis Chasma, Venus Detected From Magellan Radar Emissivity |
| title_full | Extended Rift‐Associated Volcanism in Ganis Chasma, Venus Detected From Magellan Radar Emissivity |
| title_fullStr | Extended Rift‐Associated Volcanism in Ganis Chasma, Venus Detected From Magellan Radar Emissivity |
| title_full_unstemmed | Extended Rift‐Associated Volcanism in Ganis Chasma, Venus Detected From Magellan Radar Emissivity |
| title_short | Extended Rift‐Associated Volcanism in Ganis Chasma, Venus Detected From Magellan Radar Emissivity |
| title_sort | extended rift associated volcanism in ganis chasma venus detected from magellan radar emissivity |
| topic | Venus Magellan rifts mineralogy age Ganis Chasma |
| url | https://doi.org/10.1029/2022GL099765 |
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