The Central Elysium Planitia (CEP) is one of the youngest geological units on Mars and displays evidence of volcanic and fluvial activities on the surface. The origin of the CEP material has long been debated with a range of hypotheses from purely fluvial to solely volcanic origins. This study presents a comprehensive investigation of SHAllow RADar (SHARAD) data to reveal subsurface radar reflectors over the CEP region. Distribution of the detected radar reflectors show possible connections between the CEP and outflow channels, such as Athabasca Valles and Marte Vallis. Analysis of the radar reflectors in the CEP region show six subsurface layers implying multiple depositional and erosional episodes. One detected subsurface layer is found to correspond to the upper exposed layers of one terraced crater. By measuring the depth accurately of these exposed layers in the derived HiRISE (High Resolution Imaging Scientific Experiment) and CTX (Context Camera) DTMs (Digital Terrain Models) and inverting the dielectric constant combining the layers in radargrams, an interpretation that the filling material contains water ice is favored.

中文翻译：

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SHARAD探测到的地下反射器揭示了火星中央极地平地层上的地层和埋藏通道

中央极乐世界（CEP）是火星上最年轻的地质单位之一，显示了地表火山和河流活动的证据。长期以来，关于CEP物质的起源一直以各种各样的假设进行辩论，从纯河流成因到单纯火山成因。这项研究对SHAllow雷达（SHARAD）数据进行了全面调查，以揭示CEP区域上方的地下雷达反射器。探测到的雷达反射器的分布表明，CEP和流出通道（例如Athabasca Valles和Marte Vallis）之间可能存在连接。对CEP区域中的雷达反射器的分析显示出六个地下层，这意味着多个沉积和侵蚀事件。发现一个检测到的地下层对应于一个阶梯状火山口的上部裸露层。