[P-PS07] 惑星科学

[PPS07-P12] Buried silicic volcano discovered in Gruithuisen region on the Moon

*Denggao Qiu^1,2 (1.Department of Earth and Space Science, Graduate School of Science, Osaka University, Japan、2.State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430070, China)

キーワード：volcanism, Moon, Gravity, silicic

Mons Gruithuisen is a rare example of nonmare silicic volcanoes on the Moon. We have carried out the topography, chemical compositions, and subsurface tectonic characteristics of the Gruithuisen region based on remote sensing and gravity data. Our findings indicate the presence of not only the previously identified Mons Gruithuisen silicic volcano, but also additional buried silicic volcanoes beneath mare basalt in the Gruithuisen region. Our analysis suggests that multiple phases of silicic volcanism have occurred in the Gruithuisen region. The subsurface density revealed by the gravity data also suggests the presence of several low-density masses in the crust. These early-forming silicic volcanoes at low elevations being overlain by later-in-place mare basalts, however, the side slopes of these volcanoes are not covered by mare basalts, and the low FeO and TiO₂ material is exposed on the lunar surface. Our study provides new insights into the subsurface tectonics of the region and a deeper understanding of the formation of volcanoes in the Gruithuisen region through the combined analysis of remote sensing data and gravity data.