Regional geological characteristics and evolution history of the Gagarin region on the far side of the moon
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摘要: 以月球背面加加林地区为研究对象,采用多源遥感数据解译,通过地质要素定量统计、分布特征与成因分析等研究方法,揭示了月球背面典型区域的地质特征,进而探讨了加加林地区区域地质演化历史,初步建立了该区地质特征与月球演化过程之间的联系。结果表明:区内发育的全月最长深部断裂的形成为南极艾肯撞击事件与月球热膨胀等内外应力共同作用的结果;自南极-艾肯盆地向外延伸的多处月壳厚度的线性异常延伸至月球正面各大盆地,说明在月球深部,月球背面南极-艾肯盆地的影响范围可以辐射到月球正面单元;月球背面加加林地区撞击坑数量与面积的变化规律与月球所处的地月系及太阳系演化进程有关;撞击坑定量统计结果及玄武岩单元定年结果表明,艾肯纪至雨海纪是加加林地区外动力地质作用的活跃时期,雨海纪是内动力地质作用的活跃时期。Abstract: This paper takes the Gagarin region on the far side of the moon as the research object, interprets multi-source remote sensing data, and reveals the geological characteristics of the typical region on the far side of the moon through quantitative statistics of geological elements, distribution characteristics and genetic analysis, and then discusses the regional geological evolution history of the Gagarin region. The relationship between the geological characteristics of this area and the evolution of the moon has been preliminarily established. The results show that: (1) The longest deep fault in the whole moon developed in the region is the result of the combined action of the South Pole Aiken impact event and the lunar thermal expansion and other internal and external stresses. (2) The linear anomalies of the thickness of the lunar crust extending outward from the South Pole-Aiken Basin extend to the major basins on the frontal side of the moon, indicating that the influence range of the South Pole-Aiken basin on the far side of the moon can radiate to the frontal side of the moon at the depth of the moon. (3) The variation of the number and area of impact craters in the Gagarin region on the far side of the moon is related to the evolution of the Earth-Moon system and the Solar System. (4) According to the quantitative statistical results of the impact crater and the dating results of the basalt units, the regional geological evolution history was clarified, and the active periods of geological processes in Gagarin region are divided.
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