Mead crater is the largest impact crater on Venus, with a diameter of 280 km (174 miles).[1] The crater has an inner and an outer ring and a small ejecta blanket surrounding the outer ring. Mead crater is relatively shallow (likely due to viscous relaxation[2] and infilling) and crater floor looks very similar in morphology to the surrounding plain.
Mead is classified as a multi-ring crater with its innermost, concentric scarp being interpreted as the rim of the original crater cavity. No inner peak-ring of mountain massifs is observed on Mead. The presence of hummocky, radar-bright crater ejecta crossing the radar-dark floor terrace and adjacent outer rim scarp suggests that the floor terrace is probably a giant rotated block that is concentric to, but lies outside, the original crater cavity. The flat, somewhat brighter inner floor of Mead is interpreted to result from considerable infilling of the original crater cavity by impact melt and/or by volcanic lavas. To the southeast of the crater rim, emplacement of hummocky ejecta appears to have been impeded by the topography of preexisting ridges, thus suggesting a very low ground-hugging mode of deposition for this material.[3]
Referencesedit
^Herrick; Sharpton (1996). "Geologic history of the Mead impact basin, Venus". Geology. 24 (1): 11–14. Bibcode:1996Geo....24...11H. doi:10.1130/0091-7613(1996)024<0011:GHOTMI>2.3.CO;2.
^Karimi; Dombard (2017). "Studying lower crustal flow beneath Mead basin: Implications for the thermal history and rheology of Venus". Icarus. 282: 34–39. Bibcode:2017Icar..282...34K. doi:10.1016/j.icarus.2016.09.015.
mead, crater, mead, impact, crater, venus, named, honor, cultural, anthropologist, margaret, mead, crater, characteristicsplanetvenuscoordinates12, 2quadranglesedna, planitiadiameter270, kmeponymmargaret, meadmead, crater, largest, impact, crater, venus, with,. Mead is an impact crater on Venus named in honor of the cultural anthropologist Margaret Mead Crater characteristicsPlanetVenusCoordinates12 30 N 57 12 E 12 5 N 57 2 E 12 5 57 2QuadrangleSedna PlanitiaDiameter270 kmEponymMargaret MeadMead crater is the largest impact crater on Venus with a diameter of 280 km 174 miles 1 The crater has an inner and an outer ring and a small ejecta blanket surrounding the outer ring Mead crater is relatively shallow likely due to viscous relaxation 2 and infilling and crater floor looks very similar in morphology to the surrounding plain Mead is classified as a multi ring crater with its innermost concentric scarp being interpreted as the rim of the original crater cavity No inner peak ring of mountain massifs is observed on Mead The presence of hummocky radar bright crater ejecta crossing the radar dark floor terrace and adjacent outer rim scarp suggests that the floor terrace is probably a giant rotated block that is concentric to but lies outside the original crater cavity The flat somewhat brighter inner floor of Mead is interpreted to result from considerable infilling of the original crater cavity by impact melt and or by volcanic lavas To the southeast of the crater rim emplacement of hummocky ejecta appears to have been impeded by the topography of preexisting ridges thus suggesting a very low ground hugging mode of deposition for this material 3 References edit Herrick Sharpton 1996 Geologic history of the Mead impact basin Venus Geology 24 1 11 14 Bibcode 1996Geo 24 11H doi 10 1130 0091 7613 1996 024 lt 0011 GHOTMI gt 2 3 CO 2 Karimi Dombard 2017 Studying lower crustal flow beneath Mead basin Implications for the thermal history and rheology of Venus Icarus 282 34 39 Bibcode 2017Icar 282 34K doi 10 1016 j icarus 2016 09 015 Catalog Page for PIA00148External links editImage of the crater at www espacial org Retrieved 18 April 2016 nbsp This article about an extraterrestrial geological feature is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Mead crater amp oldid 1073707005, wikipedia, wiki, book, books, library,
