Observations of Igneous Subsurface Stratigraphy during the Jezero Crater Floor Rapid Traverse from the RIMFAX Ground-penetrating Radar

被引：4

作者：

Shoemaker, Emileigh S. ^{[1
]}

Casademont, Titus M. ^{[2
]}

Carter, Lynn M. ^{[3
]}

Russell, Patrick ^{[4
]}

Dypvik, Henning ^{[2
]}

Alwmark, Sanna ^{[5
]}

Horgan, Briony H. N. ^{[6
]}

Amundsen, Hans E. F. ^{[2
]}

Eide, Sigurd ^{[2
]}

Hamran, Svein-Erik ^{[2
]}

Paige, David A. ^{[4
]}

Gupta, Sanjeev ^{[7
]}

Cardarelli, Emily L. ^{[4
]}

Arting, Uni ^{[8
]}

Berger, Tor ^{[2
]}

Brovoll, Sverre ^{[2
]}

机构：

[1] NASA Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[2] Univ Oslo, Dept Technol Syst, N-2007 Kjeller, Norway

[3] Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA

[4] Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA 90095 USA

[5] Lund Univ, Dept Geol, Solvegatan 12, S-22362 Lund, Sweden

[6] Purdue Univ, Dept Earth Atmospher & Planetary Sci, W Lafayette, IN 47907 USA

[7] Imperial Coll London, Dept Earth Sci & Engn, London, England

[8] Jarofeingi, Faroese Geol Survey, Joannesar Paturssonargota 32-34, FO-100 Torshavn, Faroe Islands

来源：

PLANETARY SCIENCE JOURNAL | 2024年 / 5卷 / 08期

关键词：

OPEN-BASIN LAKES; MARS; DEPOSITS; SYSTEM;

D O I：

10.3847/PSJ/ad6445

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Perseverance traversed the eastern, northern, and western margins of the S & eacute;& iacute;tah formation inlier on the rover's western fan front approach. Mapping the stratigraphy and extent of the M & aacute;az and S & eacute;& iacute;tah formations is key to understanding the depositional history and timing of crater floor resurfacing events. Perseverance's rapid progress across the Jezero crater floor between the Octavia E. Butler landing site and the western fan front resulted in limited contextual images of the deposits from the Navigation Camera and Mast Camera Zoom. By combining the limited surface images with continuous subsurface sounding by the Radar Imager for Mars' Subsurface Experiment (RIMFAX) ground-penetrating radar, Jezero crater floor stratigraphy was inferred along this rapid traverse. We produced the first subsurface map of the M & aacute;az formation thickness and elevation of the buried S & eacute;& iacute;tah formation for 2.3 km of the rapid traverse. Three distinct reflector packets were observed in RIMFAX profiles interspersed with regions of low-radar reflectivity. We interpret these reflector packets with increasing depth to be the Roubion member of the M & aacute;az formation (covered in places with regolith), the Rochette member, and the S & eacute;& iacute;tah formation. We found a median permittivity of 9.0 and bulk density of 3.2 g cm-3 from hyperbola fits to RIMFAX profiles, which suggests a mafic composition for M & aacute;az and S & eacute;& iacute;tah. The low-radar reflectivity regions within each reflector packet could indicate potential depositional hiatuses where low-density material like sediment or regolith could have accumulated between successive M & aacute;az formation lava flows and the S & eacute;& iacute;tah formation at depth.

引用

页数：27

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