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.

中文翻译：

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从麦哲伦雷达发射率检测到金星甘尼斯峡谷中的扩展裂谷相关火山活动

1970 至 1990 年代对金星的探索表明，金星是类地行星中最像地球的，其地质特征明显与地球不同，没有板块构造，也没有记录其前 80% 的历史。一个主要的悬而未决的问题是，金星今天是否仍然有火山活动。我们发现，Ganis Chasma 地区的雷达发射率值较低，这是因为在大约 10 s Ma 的时间尺度上，地表大气风化形成的高介电矿物数量较少。这证实了与这个主要构造裂谷带相关的地质近期火山活动的存在。这种发射率特征与瞬态热异常的空间对应表明，金星至少在过去几十年里一直在该地点进行火山活动，