Evidence for an ancient martian ocean in the topography of deformed shorelines

  title={Evidence for an ancient martian ocean in the topography of deformed shorelines},
  author={J. Taylor Perron and Jerry X. Mitrovica and Michael Manga and Isamu Matsuyama and Mark A. Richards},
A suite of observations suggests that the northern plains of Mars, which cover nearly one third of the planet's surface, may once have contained an ocean. Perhaps the most provocative evidence for an ancient ocean is a set of surface features that ring the plains for thousands of kilometres and that have been interpreted as a series of palaeoshorelines of different age. It has been shown, however, that topographic profiles along the putative shorelines contain long-wavelength trends with… 

Timing of oceans on Mars from shoreline deformation

It is found that the shorelines must have formed before and during the emplacement of Tharsis, instead of afterwards, as previously assumed, and this implies that oceans on Mars formed early, concurrent with the valley networks, and point to a close relationship between the evolution of oceans onMars and the initiation and decline of ThARSis volcanism.

Evidence for an Ancient Sea Level on Mars

  • A. Saberi
  • Geology, Physics
    The Astrophysical Journal
  • 2020
Mars shares many similarities and characteristics to Earth including various geological features and planetary structure. The remarkable bimodal distribution of elevations in both planets is one of

New Evidence of an Ancient Martian Ocean From the Global Distribution of Valley Networks

We examine the connection between true polar wander (TPW) and the evidence for an ancient ocean on Mars. Previous studies have investigated the plausibility of a Mars ocean by examining the

Consequences of Proposed Shoreline Deformation Scenarios for Jezero Crater, Mars

One of the most interesting questions about the climate and hydrology of early Mars is whether oceans existed and, if so, when. Various geologic features have been interpreted as ancient shorelines,

Mars northern plains ocean

Abstract Based on our update to the global map of the proposed paleoshorelines from the 1980s using high-quality global image and topography data acquired since the late 1990s, this chapter assesses

Boulders of the Vastitas Borealis Formation: Potential origin and implications for an ancient martian ocean

The hypothetical existence of a martian ocean that is based on identification of alleged paleoshorelines has been heavily contested during recent years. Despite the controversy surrounding the

Dielectric map of the Martian northern hemisphere and the nature of plain filling materials

A number of observations suggest that an extended ocean once covered a significant part of the Martian northern hemisphere. By probing the physical properties of the subsurface to unprecedented

Deltas and valley networks on Mars: Implications for a global hydrosphere




Oceans on Mars: An assessment of the observational evidence and possible fate

the edges of the northern plains and interpreted to be shorelines remaining from these former standing bodies of water. We examine the elevations and geologic relations along these contacts in detail

The Evolution of the Martian Hydrosphere: Implications for the Fate of a Primordial Ocean and the Current State of the Northern Plains

Abstract In this paper we consider the hydraulic and thermal conditions that gave rise to the elevated source regions of the Late Hesperian outflow channels and explore their implications for the

Internal structure and early thermal evolution of Mars from Mars Global Surveyor topography and gravity.

The strength of the lithosphere beneath the ancient southern highlands suggests that the northern hemisphere was a locus of high heat flow early in martian history and the thickness of the elastic lithosphere increases with time of loading in the northern plains and Tharsis.

A numerical study of a mantle plume beneath the Tharsis Rise: Reconciling dynamic uplift and lithospheric support models

[1] The Tharsis Rise is an area of extensive volcanism containing the most significant long-wavelength topographic and areoid anomalies on Mars. The mechanism for supporting this large topographic

Oceans in the past history of Mars: Tests for their presence using Mars Orbiter Laser Altimeter (MOLA) data

An ancient north polar ocean on Mars has been proposed [Parker et al., 1989] and we use MOLA data to test the hypothesis. Of the two proposed contacts/shorelines, the younger Contact 2 shows the

Oceans or seas in the Martian northern lowlands: High resolution imaging tests of proposed coastlines

Mars Global Surveyor Mars Orbiter Camera images that were targeted specifically to observe locations where published accounts argue for the presence of landforms created by the interaction of a large

Differential subsidence and rebound in response to changes in water loading on Mars: Possible effects on the geometry of ancient shorelines

[1] If large liquid or solid water bodies existed in the past in Martian basins such as Argyre, Hellas, and the northern lowland plains, they would have represented massive surficial loads. Earth

The role of lithospheric stress in the support of the Tharsis Rise

The Tharsis rise on Mars is a broad topographic high covered by volcanic plains and capped by large volcanoes. The geoid high associated with Tharsis shows that shallow isostatic compensation is not

The gravity field of Mars: results from Mars Global Surveyor.

Observations of the gravity field of Mars reveal a planet that has responded differently in its northern and southern hemispheres to major impacts and volcanic processes. The rough, elevated southern