52nd Lunar and Planetary Science Conference 2021 (LPI Contrib. No. 2548) 2740.pdf THE CHAIN OF ROOTLESS CONES IN CHRYSE PLANITIA ON MARS. L. Czechowski1, N. Zalewska2, A. Zambrowska2, M. Ciążela3, P. Witek4, J. Kotlarz5, 1University of Warsaw, Faculty of Physics, Institute of Geophysics, ul. Pasteura 5, 02-093 Warszawa, Poland,
[email protected], tel. +48 22 55 32 003, 2Space Research Center PAS, ul. Bartycka 18 A, 00-716 Warszawa, Poland, 3Space Research Center PAS, ul. Bartycka 18 A, 00-716 Warszawa, Poland (presently Institute of Geological Sciences, PAS. ul. Twarda 51/55, 00-818 Warszawa, Poland). 4Copernicus Science Centre, ul. Wybrzeże Kościuszkowskie 20, 00-390 Warszawa, Poland, 5Łukasiewicz Research Network - Institute of Aviation, Al. Krakowska 110/114, 02-256 Warszawa, Poland. Introduction: We consider a small region in Chryse The material ejected by the explosion covered the valley Planitia ( ~38o14′ N, ~319o25’ E) where several chains and the slopes of the neighboring hills. (iii) Later, the of cones are found – Fig. 1. The cones height are ~10- lower structures (including the valley floor) were 20 m. The considered region is at the boundary of covered with fine aeolian sediments. smooth plain on west (AHcs) and complex unit (AHcc) To test this hypothesis, we computed the apparent on east. The small region (HNck) in north-west corner thermal inertia in this area. is the “older knobby material” – [1], where AH means Amazonian-Hesperian, and HN - Hesperian-Noachian. The region is covered by lacustrine deposits. Note also possible lava flows (in HNck). Small cones are common on Mars. Many cones form chains several kilometers in length.