Rifts on Venus and Earth: Similarities and Differences


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The terrestrial rift zones of the Eastern branch of the East African Rift System (EARS) have the greatest similarity with the Venusian rifts of Atla and BetaRegions where the dominant features are large dome-shaped rises. However, the rift-bearing domes of Venus are about two times larger than their terrestrial counterparts. The rift zones on Venus and Earth are similar in their linear axial grabens bounded by side uplifts; however their quantitative morphometric characteristics differ significantly. The rifts on Venus are about twice as long and wide comparing with the rifts of the Earth, although their horizontal extensions are significantly less. The mechanisms of rift origin appear to be similar for the Venusian Atla and Beta regions and for the Eastern branchof EARS. The impact of an ascending mantle flows onto the lithosphere, followed by formation of the domical rises and extension resulted in rift formation.The significant dissimilarities in their morphometric characteristics is most likely associated with the lithospheric thickness of the pre-rift lithosphere.

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