Document Type

Article

Publication Date

1980

Abstract

Ina is a unique D-shaped depression located atop a 15-km diameter extrusive dome south- east ofthe Imbrium basin It lies in a region that is d dissected by lincations radial both Imbrium and Serenitatis. The rim of Ina is characterized by discontinuous concentric fractures, flows, and a smooth raised border, The floor contains 4 separate units, including smooth, sparsely cratered p pro- trusions or mounds ranging in height from 5 to 25 m. The mounds are compared to the terrestrial lava pillars called Dimmuborgir located in northern Iccland. These pillars are morphologically similar to the Ina mounds and may have formed by the collapse and subsidencc of a partially solidified lava lake. However, the distribution of the mounds in lna, the disparate heights of their summits, and the extrusive The dome underlying Ina appears comparable to low terrestrial basaltic shields although it exhibits some morphological idifferences, The unusual morphology of the Ina structure may have bcen infilu- inced by its location in a highly fractured region betwecn two of the largest nearside impact basins, and by the compostion ot the magnma.

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