In this particular study, we have examined the proximal elevations and topographic slopes of 16 of the most distinctive flow fields that represent each of the 6 morphologic types. Mylitta Fluctus is a volcanic flow field that covers approximately 300,000 km2 in southern Lavinia Planitia. To answer these questions we have begun to examine variations in flow field dimension and morphology the distribution of large flow fields in terms of elevation above the mean planetary radius links to regional tectonic or volcanic structures (e.g., associations with large shield edifices, coronae, or rift zones) statigraphic relationships between large flow fields, volcanic plains, shields, and coronae and various models of flow emplacement in order to estimate eruption parameters. The area is similar in size to the Columbia. In particular, we would like to address the following: (1) eruption conditions and style of flow emplacement (effusion rate, eruption duration), (2) the nature of magma storage zones (presence of neutral buoyancy zones, deep or shallow crustal magma chambers), (3) the origin of melt and possible link to mantle plumes, and (4) the importance of large flow fields in plains evolution. Mylitta Fluctus is a complex of six flow fields in the southern hemisphere of Venus Roberts et al., 1992. As a result of our previous analysis of the detailed morphology, stratigraphy, and tectonic associations of Mylitta Fluctus, we have formulated a number of questions to apply to all large flow fields on Venus. Mylitta Fluctus is one of the larger fields, with an area of 300,000 km2 and estimated thickness of 250. Digitate flow fields are divided further into divergent (Types 3-5) and subparallel (Type 6) classes on the basis of variations in the amount of downstream flow divergence. Transitional flow fields (Type 2) are similar to sheetlike flow fields but contain one or more broad flow lobes. Sheetlike flow fields (Type 1) lack the numerous, closely spaced, discrete lava flow lobes that characterize digitate flow fields. Department of the Interior | U.S.Extensive lava flow fields on Venus: Preliminary investigation of source elevation and regional slope variations Large-volume lava flow fields have been identified on Venus, the most areally extensive of which are known as fluctus and have been subdivided into six morphologic types. Telephone: (888) ASK-USGS e-mail: FOIA Privacy Policies and Notices This map is available in paper form from: | Publications main page | Other Planetary Maps | Mylitta Fluctus, Venus - Rift-related, centralized volcanism and the emplacement of large-volume flow units Article Nov 1992 Kari Magee Roberts J. The southeastern part of the map area shows the western part of the upland of Lada Terra, the summit of which is about 3 km above mean planetary radius.ĭownload this map as an ~47" x 42" PDF document (sim2920.pdf 17.7 MB)ĭownload the accompanying pamphlet as a 19-page PDF document (sim2920pamphlet.pdf 976 kB)įor questions about the content of this report, contact Ken Tanakaĭownload a free copy of the current version of Adobe Reader. The northern third of the quadrangle covers the southern part of Lavinia Planitia, which represents a class of equidimensional lowlands on Venus (Bindschadler and others, 1992b) and is as deep as about 1.5–2 km below mean planetary radius. Mylitta Fluctus, Venus - Rift-related, centralized volcanism and the emplacement of large-volume flow units Article Nov 1992 Kari Magee Roberts J. Geologic Map of the Mylitta Fluctus Quadrangle (V-61), Venus. The Mylitta Fluctus quadrangle (V-61) is in the southern hemisphere of Venus and extends from lat 50° to 75° S. The tropical tasar silkworm, Antheraea mylitta, is a semi-domesticated vanya silk-producing. Magellan Mission objectives included (1) improving the knowledge of the geological processes, surface properties, and geologic history of Venus by analysis of surface radar characteristics, topography, and morphology and (2) improving the knowledge of the geophysics of Venus by analysis of Venusian gravity. Head, III Pamphlet to accompany Scientifiic Investigations Map 2920 2006 U.S. The flow morphology, stratigraphy, and evoluton of Mylitta Fluctus, a massive lava flow field on Venus, is characterized, and the link between its origin and the local tectonics is examined. The Magellan spacecraft orbited Venus from August 10, 1990, until it plunged into the Venusian atmosphere on October 12, 1994. Geologic Map of the Mylitta Fluctus Quadrangle (V61), Venus By Mikhail A. Version 1.0 Geologic Map of the Mylitta Fluctus Quadrangle (V-61), Venus By Mikhail A.
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