Journal article
An Evolved Early Crust Exposed on Mars Revealed Through Spectroscopy
Geophysical research letters, Vol.49(21), e2022GL099639
11/16/2022
DOI: 10.1029/2022GL099639
Appears in UI Libraries Support Open Access
Abstract
Mars early crust is more complex than homogenously basaltic with evolved magmatism evidenced by intermediate and felsic igneous rocks found in various locations in the southern hemisphere and martian meteorites. Geophysical constraints argue against a dense thick basaltic crust in the southern hemisphere, rather consistent with a buried light crust (<3,100 kg m−3), possibly evolved, underneath a basaltic surface. One of the oldest crustal components accessible at the surface of Mars, Terra Cimmeria/Sirenum (TSC), presents geochemical anomalies potentially suggesting an evolved crustal component at depth. Using visible/near infrared spectroscopy, we identify nine excavated feldspar-rich locations in this region, and thermal infrared data suggest a silica concentration corresponding to intermediate compositions. The low density of such terrains compared to basalts supports that TSC crustal component is evolved. Early crusts of planetary bodies in the solar system were thus not restricted to basaltic compositions, and evolved crusts might have been widespread.
Details
- Title: Subtitle
- An Evolved Early Crust Exposed on Mars Revealed Through Spectroscopy
- Creators
- V Payré - University of IowaM R Salvatore - Northern Arizona UniversityC S Edwards - Northern Arizona University
- Resource Type
- Journal article
- Publication Details
- Geophysical research letters, Vol.49(21), e2022GL099639
- DOI
- 10.1029/2022GL099639
- ISSN
- 0094-8276
- eISSN
- 1944-8007
- Publisher
- Wiley
- Language
- English
- Electronic publication date
- 10/10/2022
- Date published
- 11/16/2022
- Academic Unit
- Earth and Environmental Sciences
- Record Identifier
- 9984309025402771
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