RIMFAX 地面穿透雷达在杰泽罗陨石坑底部快速穿越期间对火成岩次表层地层的观察

IF 3.8 Q2 ASTRONOMY & ASTROPHYSICS The Planetary Science Journal Pub Date : 2024-08-29 DOI:10.3847/psj/ad6445
Emileigh S. Shoemaker, Titus M. Casademont, Lynn M. Carter, Patrick Russell, Henning Dypvik, Sanna Alwmark, Briony H. N. Horgan, Hans E. F. Amundsen, Sigurd Eide, Svein-Erik Hamran, David A. Paige, Sanjeev Gupta, Emily L. Cardarelli, Uni Árting, Tor Berger, Sverre Brovoll
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引用次数: 0

摘要

毅力号 "在漫游者西侧扇形前沿路线上穿越了塞伊塔地层内层的东部、北部和西部边缘。绘制Máaz地层和Séítah地层的地层和范围是了解陨石坑底部重铺事件的沉积历史和时间的关键。毅力号在 Octavia E. Butler着陆点和西部扇形前沿之间的杰泽罗陨石坑底部快速行进,导致导航相机和桅杆相机变焦拍摄的沉积物背景图像有限。通过将有限的地表图像与火星地表下实验雷达成像仪(RIMFAX)地面穿透雷达的连续地表探测相结合,我们推断出了这一快速穿越过程中杰泽罗陨石坑底部的地层。我们首次绘制了快速横穿 2.3 千米的 Máaz 地层厚度和埋藏的 Séítah 地层海拔的地下地图。在 RIMFAX 剖面图中观察到三个不同的反射包,中间夹杂着低雷达反射区域。我们认为,随着深度的增加,这些反射包分别是 Máaz 地层的 Roubion 层(有些地方被碎屑岩覆盖)、Rochette 层和 Séítah 层。通过对 RIMFAX 剖面的双曲线拟合,我们发现中值介电常数为 9.0,体积密度为 3.2 g cm-3,这表明 Máaz 和 Séítah 的成分为岩浆岩。每个反射包内的低雷达反射率区域可能表示潜在的沉积间隙,沉积物或碎屑岩等低密度物质可能积聚在连续的 Máaz 形成的熔岩流和深处的 Séítah 形成的熔岩流之间。
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Observations of Igneous Subsurface Stratigraphy during the Jezero Crater Floor Rapid Traverse from the RIMFAX Ground-penetrating Radar
Perseverance traversed the eastern, northern, and western margins of the Séítah formation inlier on the rover’s western fan front approach. Mapping the stratigraphy and extent of the Máaz and Séítah 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 Máaz formation thickness and elevation of the buried Séítah 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 Máaz formation (covered in places with regolith), the Rochette member, and the Séítah 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 Máaz and Séítah. 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 Máaz formation lava flows and the Séítah formation at depth.
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来源期刊
The Planetary Science Journal
The Planetary Science Journal Earth and Planetary Sciences-Geophysics
CiteScore
5.20
自引率
0.00%
发文量
249
审稿时长
15 weeks
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