Geophysical structure of a local area in the lunar Oceanus Procellarum region investigated using the gravity gradient method

IF 0.5 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS Studia Geophysica et Geodaetica Pub Date : 2024-08-19 DOI:10.1007/s11200-024-0502-z
Shaofeng Bian, Zhourun Ye, Xinghui Liang, Lintao Liu, Jinzhao Liu
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Abstract

Compared to gravity method, the gravity gradient has multi-component advantages and can emphasize short wavelength features. By providing more detailed features in the image display, it could present a more accurate determination of the spatial distribution of the underling anomaly body. In our study, based on the gravity gradient data that was synthesized from the high-precision gravity model from Gravity Recovery and Interior Laboratory mission, we analyzed the tectonic structure of the Moon’s shallow layers in Oceanus Procellarum region. Bouguer anomalies of gravity gradient are used for geological boundary recognition and three-dimensional density inversion. Theta Map method is adopted for the edge identification of geological structures. It fully utilizes the characteristics of multi-components combination of gravity gradient to sharpen the boundaries identification of abnormal bodies. During the density inversion, in order to decrease the non-unique solution problem, the depth weight constraint is added to the inversion equation. Furthermore, the method of wavelet coefficient compression and Least Squares QR-decomposition is applied to accelerate the inverse calculation of large ill-conditioned equations. According to the result illustration, we found that: 1) The combination of gravity tensors has a strong boundary recognition ability in the horizontal direction. There is close consistency with the results of density inversion. 2) Our study supports the expansion and intrusion hypothesis of lunar magma in the research zone of Oceanus Procellarum, since the distribution of density tomography results at different depths is higher than the normal assumed crust density of the Moon in the majority of areas. Moreover, the intrusion source in our research area is concentrated at a direction depth of 30–45 km below the mean lunar radius surface approximately.

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利用重力梯度法研究月球前星际大洋区域局部地区的地球物理结构
与重力法相比,重力梯度法具有多分量优势,并能突出短波长特征。在图像显示中提供更详细的特征,可以更准确地确定底层异常体的空间分布。在我们的研究中,根据重力恢复和内部实验室任务的高精度重力模型合成的重力梯度数据,我们分析了 Procellarum 海洋区域月球浅层的构造结构。重力梯度布格尔异常用于地质边界识别和三维密度反演。采用 Theta Map 方法进行地质结构边缘识别。它充分利用了重力梯度多分量组合的特点,使异常体的边界识别更加清晰。在密度反演过程中,为了减少非唯一解问题,在反演方程中加入了深度权重约束。此外,还采用了小波系数压缩和最小二乘 QR 分解的方法,以加速大型非条件方程的反演计算。根据结果说明,我们发现1) 重力张量组合在水平方向上具有很强的边界识别能力。与密度反演的结果密切吻合。2)由于密度层析成像结果在不同深度的分布在大部分区域都高于月球正常假定的地壳密度,我们的研究支持了临近星洋研究区月球岩浆膨胀和侵入假说。此外,我们研究区域的侵入源集中在平均月球半径表面以下约 30-45 千米的方向深度。
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来源期刊
Studia Geophysica et Geodaetica
Studia Geophysica et Geodaetica 地学-地球化学与地球物理
CiteScore
1.90
自引率
0.00%
发文量
8
审稿时长
6-12 weeks
期刊介绍: Studia geophysica et geodaetica is an international journal covering all aspects of geophysics, meteorology and climatology, and of geodesy. Published by the Institute of Geophysics of the Academy of Sciences of the Czech Republic, it has a long tradition, being published quarterly since 1956. Studia publishes theoretical and methodological contributions, which are of interest for academia as well as industry. The journal offers fast publication of contributions in regular as well as topical issues.
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