Faulted Kipuka

This striking mountain within Mare Imbrium was altered at its base by the formation of a lobate scarp. A wrinkle ridge runs into the base of the mountain (bottom right). Image width is approximately 4.5 km. LROC NAC image M1098943917R [NASA/GSFC/Arizona State University].

This beautiful mountain, called a kipuka, is located in northern Mare Imbrium on the nearside. Kipukas are the high-standing remnants of a lava-flooded terrain and are quite common on the Moon. In this case, the kipukas are likely part of the inner ring of the Imbrium impact basin that was later flooded by mare basalts. The lobate scarp in the opening image formed due to contraction and the subsequent upward thrusting of the surface. This scarp looks very familiar, a twin to the famous Lee-Lincoln scarp that the Apollo 17 astronauts explored in the Taurus-Littrow Valley.

LROC WAC context image of Mare Imbrium centered at 49.459°N, 348.136°E. The red box denotes the location of the NAC frame from which today's Featured Image was taken. Plato is approximately 101 km in diameter [NASA/GSFC/Arizona State University].

Another common feature in Mare Imbrium are wrinkle ridges like the one in today's Featured Image. Wrinkle ridges form when the surface undergoes compression due to sagging of the lithosphere below large mare deposits. Local tectonic conditions such as the thickness of the mare, direction of stress, and the strength of the basalt affect the final shape of a wrinkle ridge, yielding a variety of ribbon-like ridge forms.

Investigate this complex area for yourself below!

Related Posts:

That's a Relief

Balcony Over Plato

Wrinkled, But How Old?

Wrinkle Ridge in Mare Crisium 

Remnants of the Imbrium impact

Published by H. Meyer on 21 March 2014