雨海晚期玄武岩的规模研究

发布时间：2018-05-16 06:01

本文选题：月球 + 雨海　；参考：《中国科学:物理学力学天文学》2016年02期

【摘要】：月球的岩浆活动揭示了其演化规律.月海玄武岩的规模,反映了月幔的部分熔融程度和源区的深度,对研究月球玄武岩的成因和热演化具有重要意义.月球爱拉托逊纪的岩浆活动在雨海盆地堆积了大面积溢流、光谱独特的高/中钛玄武岩,他们是了解雨海晚期热演化的钥匙.本文基于多种遥感数据,分别利用地形剖面分析法和月坑挖掘深度法,对雨海不同出露情况的各期次晚期玄武岩的厚度和体积进行研究,并简要探讨了喷发通量的变化.研究结果表明,上爱拉托逊纪地层(UEm)厚度为13 33 m,单层熔岩流的厚度为(11±4)m.下爱拉托逊纪地层(LEm)厚度为14.49 43.61 m.将UEm地层的出露体积(~539.3 km~3),LEm地层的出露体积(~5198 km~3)和UEm下伏晚期玄武岩的体积(~556.2 km~3)相加,得到雨海晚期玄武岩总体积为~6479 km~3,远低于Schaber的估计(~4×10~4 km~3).其中,UEm玄武岩出露体积占LEm玄武岩出露体积的比例1/8,表明雨海爱拉托逊纪玄武岩喷发逐渐减少.本文还基于各UEm单元的出露面积和定年数据,得到了局部雨海晚期玄武岩面积通量的变化:Em5减少了249.56 km~2/Ma,Em6减少了39.49 km~2/Ma,Em7减少了46.89 km~2/Ma,表明雨海晚期的岩浆活动逐渐减弱.
[Abstract]:The magmatic activity of the moon reveals its evolution law. The scale of the lunar basalt reflects the degree of partial melting of the lunar mantle and the depth of the source region, which is of great significance to the study of the genesis and thermal evolution of the lunar basalt. The magmatic activity of the Ailatossian period on the moon accumulates large area overflow and unique spectral high / medium titanium basalt in the Yuhai basin, which is the key to understand the thermal evolution of the late rain sea. Based on various remote sensing data, the thickness and volume of basalt in different stages of outburst in rain sea are studied by using topographic profile analysis and lunar pit excavation depth method, respectively, and the variation of eruption flux is discussed briefly. The results show that the thickness of UE is 13 ~ 33 m and the thickness of monolayer lava flow is 11 卤4 m. The LEmthickness of the Lower Altorisian strata is 14.49 ~ 43.61 m. The total volume of basalt in late stage of UEm is 6 479 km / m ~ 3, which is far lower than that estimated by Schaber, and the volume of late basalt in UEm is 556.2 km ~ (3), which is far lower than the estimated volume of 4 脳 10 ~ (4) km / m ~ (3) of Schaber. The ratio of outburst volume of LEm basalt to that of UEM basalt is 1 / 8, which indicates that the eruption of basalt decreases gradually. Based on the outcropping area and dating data of each UEm unit, the variation of the area flux of basalt in the late stage of the local rain sea is obtained. The variation of the area flux of basalt in the late stage of the rain sea is reduced by 249.56 km2 / 2 / 6 and by 39.49 km2 / 2 / Maem7 by 46.89 km2 / 2Maa, which indicates that the magmatic activity in the late stage of the rain sea gradually decreases.
【作者单位】：南京大学地理与海洋科学学院;江苏省地理信息资源开发与利用协同创新中心;中国科学院行星科学重点实验室;澳门科技大学太空科学研究所;江苏省有色金属华东地质勘查局;
【基金】：中国科学院重点部署项目(编号:KGZD-EW-603) 国家自然科学基金(批准号:41172296,41422110) 澳门科学技术发展基金(编号:048/2012/A2)资助
【分类号】：P184

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