Gambart Region

Gambart  domes (termed Gambart 1-3)

by Mike Wirths

by George Tarsoudis

Dome	Longitude	Latitude	Diameter [km]	Heigth [m]	Slope[°]
Gambart 1 Gambart 2 Gambart 3	-14.84° -12.27° -12.60°	-0.75°  2.87°  2.63°	30.0 ± 0.5 19.5 ± 0.5  9.0 ± 0.5	140 ± 15   190 ± 20    50 ±  5	0.57 ± 0.05 1.11 ± 0.1  0.63 ± 0.06

Gambart 1 is 140 m high, has a large diameter of 30 km resulting in a low flank slope of 0.57° ± 0.05°. Its flat surface is traversed by linear rille indicating tensional stress, like other large and flat domes on the Moon. These linear rilles were probably formed by the stress fields associated with dikes that ascended to shallow depths below the surface. Hence Gambart 1 belongs to class In₁ of candidate intrusive domes. 

Gambart 2 and 3 domes have a diameter of 19.5 ± 0.5 km and 9 ± 0.1km, respectively. Their heights amount to 190 ± 20 m and 50 ± 5 m resulting in flank slopes of 1.11° ± 0.1° and 0.63° ± 0.06°, respectively. Although two domes in Gambart C are located close to each other, their morphometric and rheologic properties indicate different eruption conditions. According to its different character the magma rise speed was higher for Gam2 dome, probably due to a higher lava temperature and thus a decreased degree of crystallisation during magma ascending at higher speed through a narrower and shorter feeder dike (estimated to 4 m and 17 km, for Gam 3 and 28 m and 108 km for Gam 2). Due its morphometric properties, Gambart 2 belongs to the class C1, while Gambart 3 is situated between classes C1 and C2.