Tag Archives: crustal dichotomy

THEMIS: Rough ground in Nilosyrtis

THEMIS Image of the Day, June 11, 2019. Today’s VIS image is located on the margin of the Terra Sabaea highlands and the Nilosyrtis Mensae lowlands. The drop off is very steep – about 18,000 ft. This “edge” circles the … Continue reading

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HiRISE: Dipping layers

Dipping layers. These aren’t dipping dots. The objective of this observation is to examine several sets of dipping layers in a depression in Ismeniae Fossae, which straddles the southern highlands/northern lowlands of Mars. HiRISE Picture of the Day archive. [More … Continue reading

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CRISM: Hydrated minerals of Cydonia Colles

In this scene we observe the knobs within the northern lowlands (Acidalia Planitia) that are Fe/Mg phyllosilicate-bearing (pink-blue) and small, patchy exposures of hydrated silica (green) surrounding the knobs. Previously, phyllosilicates have only been found within impact craters in the … Continue reading

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HiRISE: Inverted channels

Inverted channels at the boundary of highlands and intercrater plains. This image targets inverted channels located at the boundary between Noachian highlands and Noachian intercrater plains bedrock. These channels are 200 to 500 meters wide, implying substantial fluvial activity. High-resolution … Continue reading

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Crustal dichotomy: First a giant impact, then a superplume at the antipode

The result of collaboration between researchers at UC Berkeley, USA and the Institute of Earth Sciences, Taiwan, suggests a two-stage process to explain the martian crustal dichotomy. The dichotomy is a 5-km elevation difference between the northern and southern hemispheres … Continue reading

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HRSC: Mars impact crater or supervolcano?

These images from [the High Resolution Stereo Camera on] ESA’s Mars Express show a crater named Ismenia Patera on the Red Planet. Its origin remains uncertain: did a meteorite smash into the surface or could it be the remnants of … Continue reading

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Mars’ oceans formed early, with a possible assist from volcanism

A new scenario seeking to explain how Mars’ putative oceans came and went over the last 4 billion years implies that the oceans formed several hundred million years earlier and were not as deep as once thought. The proposal [published … Continue reading

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New gravity map suggests Mars crust is porous

NASA scientists have found evidence that Mars’ crust is not as dense as previously thought, a clue that could help researchers better understand the Red Planet’s interior structure and evolution. A lower density likely means that at least part of … Continue reading

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Did a giant impact create the northern lowlands, both moons, and enrich the mantle?

The origin and nature of Mars are mysterious. The planet has geologically distinct hemispheres with smooth lowlands in the north and cratered, high-elevation terrain in the south. The red planet also has two small oddly-shaped oblong moons and a composition that sets … Continue reading

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HiRISE: Highlands to lowlands in far-west Arabia

From the highlands to the lowlands in the far western Arabia region. Beautiful Mars series.

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