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| Margaritifer Terra | |
|---|---|
| Name | Margaritifer Terra |
| Type | Martian highland region |
| Coordinates | 0°–20°S, 10°–350°W |
| Region | Margaritifer Terra quadrangle |
| Notable features | Uzboi Vallis, Ares Vallis, Nirgal Vallis, Holden Crater, Iani Chaos |
| Discovered by | Mariner 9 |
| Images | Mariner 9, Viking Orbiter, Mars Global Surveyor, Mars Reconnaissance Orbiter |
Margaritifer Terra
Margaritifer Terra is an extensive highland region on Mars characterized by deeply dissected terrain, ancient cratered plains, and pervasive fluvial sculpting. The region links key Martian basins and outflow channels and has been a focal point for missions and studies by organizations such as NASA, European Space Agency, and Jet Propulsion Laboratory. It preserves evidence relevant to investigations by spacecraft including Mariner 9, Viking program, Mars Global Surveyor, Mars Odyssey, Mars Reconnaissance Orbiter, and Mars Express.
Margaritifer Terra spans terrains adjacent to the Noachis Terra and Xanthe Terra provinces and abuts the Memnonia quadrangle and Iani Chaos locales, forming part of the Margaritifer Sinus quadrangle study area used by USGS Astrogeology Science Center and planetary geologists. The region includes features catalogued by the International Astronomical Union and mapped during campaigns by University of Arizona teams and investigators at the Smithsonian Institution. Its stratigraphy records interactions between highland crustal processes recognized by researchers from Caltech and structural analyses conducted by scientists at Brown University and Massachusetts Institute of Technology.
Margaritifer Terra displays a complex mosaic of ancient Noachian crust, impact basins such as Holden Crater, chaotic terrains like Iani Chaos, and valley networks exemplified by Nirgal Vallis. Structural mapping by teams from California Institute of Technology and Cornell University highlights lobate ejecta, wrinkle ridges, and layered sediments comparable to units studied in Valles Marineris and Meridiani Planum. Stratigraphic relationships have been interpreted using datasets from instruments such as HiRISE, CTX, and THEMIS and modeled by researchers affiliated with Jet Propulsion Laboratory and Brown University.
The region contains major outflow channels—Ares Vallis and Uzboi Vallis—which connect to basins tied to hypothesized episodes of catastrophic flooding cited in work by scientists at University of Oxford and Imperial College London. Valley networks and inverted channels investigated by teams at University of California, Berkeley and Washington University in St. Louis suggest sustained fluvial incision contemporaneous with the Noachian epoch. Sediment routing into paleodeltas and depositional fans near Eberswalde Crater and Holden Crater has been analyzed by groups from Planetary Science Institute and Lunar and Planetary Institute using data from CRISM and MOLA.
Spectroscopic surveys with CRISM and observations by OMEGA have identified phyllosilicates, sulfates, and iron oxides across layered exposures, results reported by teams at Brown University, Arizona State University, and Caltech. Authigenic clays in the region resemble minerals mapped in Mawrth Vallis and Nili Fossae, and laboratory analog studies at NASA Ames Research Center and Jet Propulsion Laboratory support aqueous alteration scenarios. Elemental abundances inferred from Gamma Ray Spectrometer data and inferences by researchers at Los Alamos National Laboratory point to regional heterogeneity in silica and hydrated minerals comparable to deposits characterized by the Mars Science Laboratory at Gale Crater.
Paleoclimate interpretations for Margaritifer Terra synthesize geomorphic analyses by investigators at University of Chicago and University of Arizona and climate modeling by groups at University of Colorado Boulder and Pennsylvania State University. Evidence for episodic warm-wet conditions during the Noachian, interspersed with colder, drier phases tied to the Hesperian epoch, has been proposed in comparative work with paleolake sites such as Jezero Crater and Gale Crater. Isotopic and sediment transport models developed at Caltech and Massachusetts Institute of Technology help constrain duration and intensity of fluvial activity implicated by valley incision and deltaic preservation.
Margaritifer Terra has been imaged and analyzed by missions and instruments across agencies: Mariner 9, Viking 1 and Viking 2, Mars Global Surveyor (including MOC), Mars Odyssey (including THEMIS), Mars Express (including HRSC and OMEGA), and Mars Reconnaissance Orbiter (including HiRISE, CTX, CRISM). Mission science teams at NASA Jet Propulsion Laboratory, Cornell University, and University of Arizona have produced high-resolution maps and landing site assessments; the region figured in selection deliberations for rover missions by panels convened at NASA Headquarters and input from National Academies studies.
The fluvial geomorphology and mineralogical assemblages in Margaritifer Terra render it pivotal for hypotheses about ancient habitability posited by researchers at NASA Astrobiology Institute, European Astrobiology Institute, and the SETI Institute. Clay- and sulfate-bearing stratigraphy offers preservation potential for organics comparable to analog studies conducted by teams at Carnegie Institution for Science and Scripps Institution of Oceanography. Continued study informs landing site selection and mission design by NASA Mars Exploration Program and international collaborations including Roscosmos-partnered concepts and proposals from groups at University College London and Max Planck Institute for Solar System Research.
Category:Mars regions