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Gibran (crater)

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Gibran (crater)

Gibran (crater)
Planet Mercury
Coordinates

35°30′N 110°24′W / 35.5°N 110.4°W / 35.5; -110.4Coordinates: 35°30′N 110°24′W / 35.5°N 110.4°W / 35.5; -110.4

Diameter 102.0 km[1]
Eponym Khalil Gibran[2]

Gibran is a crater on Mercury, which was discovered in January 2008 during the first flyby of the planet by MESSENGER spacecraft. It contains a large (29 × 29 km), nearly circular pit crater.[1] Multiple examples of pit craters have been observed on Mercury on the floors of impact craters, leading to the name pit-floor craters for the impact structures that host these features. Unlike impact craters, pit craters are rimless, often irregularly shaped, steep-sided, and often display no associated ejecta or lava flows.[1] These pit craters are thought to be evidence of shallow volcanic activity and may have formed when retreating magma caused an unsupported area of the surface to collapse, creating a pit. They are analogs of Earth's volcanic calderas.[1] Pit-floor craters may provide an indication of internal igneous processes where other evidence of volcanic processes is absent or ambiguous. The discovery of multiple pit-floor craters augments evidence that volcanic activity has been a widespread process in the geologic evolution of Mercury's crust.[3]

References

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