Study on Morphological Characteristics and Genesis of Dome Around Chang’E-5 Sampling Point

Abstract

Mons Rümker and Mairan volcanic dome structure are distributed around Chang’E-5 sampling point. At present, there is a lack of comparative research on their morphological characteristics, genesis and classification standards. Therefore, this paper compared the morphological characteristics and formation factors of the two types of domes through Chang’E image and topographic data, and discussed the division criteria of domes. In this study, 13 lunar mare domes of Mons Rümker and 4 non-mare domes of Mairan were delineated, and the magma rheological parameters during the formation of the domes were calculated. The results show that the Rümker lunar mare domes are relatively low and flat. According to the slope and height, the domes are divided into Rümker type I lunar mare dome (slope < 5 °, height 200-400 m) and Rümker type II mare dome (slope 5 °-7 °, height 300-600 m). Among them, the second kind of higher and steeper lunar sea dome has higher viscosity and lower eruption rate. Compared with the Rümker mare dome, the Mairan non-mare dome is higher and steeper, and its magma eruption rate is generally lower than that of mare domes, with high magma viscosity, poor fluidity and long eruption cycle. Spatially, the four non-lunar mare domes where Mairan is located are linearly distributed and their material composition and formation time are similar, indicating that they are likely to be related to each other.

Keywords

surrounding area of Chang’E-5 sampling point / volcanic dome structure / morphological characteristics of dome / genesis of dome