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Aubele, Jayne C.

Publications and source records attributed to Aubele, Jayne C..

9 records
All sourcesNASA NTRSDOE OSTI
NASA NTRS1993

Relation of major volcanic center concentration on Venus to global tectonic patterns

Global analysis of Magellan image data indicates that a major concentration of volcanic centers covering about 40 percent of the surface of Venus occurs between the Beta, Atla, and Themis regions. Associated with this enhanced concentration are geological characteristics commonly interpreted as rifting and mantle upwelling. Interconnected low plains in an annulus around this concentration are characterized by crustal shortening and infrequent volcanic centers that may represent sites of mantle return flow and net downwelling. Together, these observations suggest the existence of relatively simple, large-scale patterns of mantle circulation similar to those associated with concentrations of intraplate volcanism on earth.

Crumpler, L. S.↗
NASA NTRS1993

Geologic history of central Chryse Planitia and the Viking 1 landing site, Mars

A 1:500,000 scale geologic mapping was undertaken to synthesize the broad-scale geology of Chryse Planitia with the local geology of the Viking 1 landing site. The geology of Mars Transverse Mercators (MTM's) 20047 and 25047 has been presented previously. As part of the goals for the Mars Geologic Mapping program, the rational and scientific objectives for a return mission to Chryse Planitia and the Viking 1 Lander have also been presented. However, in mapping central Chryse Planitia our principle objective was to determine the depositional and erosional history of the Chryse Planitia basin. These results are presented.

Craddock, Robert A.↗
NASA NTRS1993

The Magellan volcanic and magmatic feature catalog

A catalog summarizing the location and characteristics of 1663 volcanic and magmatic centers identified in Magellan radar images of the surface of Venus is in final preparation to be submitted as a Geological Society of America Special Paper. The following is a brief summary preview of the contents and methods used in assembling the final data set, the organization of the catalog, and other notes of interest to potential users.

Crumpler, L. S.↗
NASA NTRS1993

Regional mantle upwelling on Venus: The Beta-Atla-Themis anomaly and correlation with global tectonic patterns

The morphology and global distribution of volcanic centers and their association with other geological characteristics offers significant insight into the global patterns of geology, tectonic style, thermal state, and interior dynamics of Venus. Magellan data permit the detailed geological interpretation necessary to address questions about interior dynamics of Venus particularly as they reflect relatively physical, chemical, and thermal conditions of the interior. This paper focuses on the distribution of anomalous concentrations of volcanic centers on Venus and regional patterns of tectonic deformation as it may relate to the identification of global internal anomalies, including mantle dynamic, petrological, or thermal patterns.

Crumpler, L. S.↗
NASA NTRS1992

Global scale concentrations of volcanic activity on Venus: A summary of three 23rd Lunar and Planetary Science Conference abstracts. 1: Venus volcanism: Global distribution and classification from Magellan data. 2: A major global-scale concentration of volcanic activity in the Beta-Atla-Themis region of Venus. 3: Two global concentrations of volcanism on Venus: Geologic associations and implications for global pattern of upwelling and downwelling

As part of the analysis of data from the Magellan Mission, we have compiled a global survey of the location, dimensions, and subsidiary notes of all identified volcanic features on Venus. More than 90 percent of the surface area was examined and the final catalog comprehensively identifies 1548 individual volcanic features larger than approximately 20 km in diameter. Volcanic features included are large volcanoes, intermediate volcanoes, fields of small shield volcanoes, calderas, large lava channels, and lava floods as well as unusual features first noted on Venus such as coronae, arachnoids, and novae.

Crumpler, L. S.↗
NASA NTRS1991

Preliminary geologic mapping of central Chryse Planitia, Mars

Because of the success of the Viking lander mission, central Chryse Planitia represents one of two areas on the Martian surface where planetary geologic mapping is added by ground-truth observations. The broadscale geology of Chryse Planitia and the geology of the Viking 1 landing site have been previously examined by other investigators. A 1:500,000 scale mapping of central Chryse Planitia and the Viking landing site was undertaken to synthesize these results and to address the following: (1) the depositional and erosional history of the Chryse Planitia basin; (2) the degree to which the Viking 1 surface materials are representative of the Chryse Planitia regions and of plains in general; (3) the extent of channel materials versus ridged plains materials; and (4) the primary objectives of future missions to the surface of Mars. The preliminary results of the investigation are presented.

Craddock, Robert A.↗
NASA NTRS1990

Small domes on Venus - Characteristics and origin

The areal and size-frequency distribution, abundance, individual characteristics, and geologic and regional associations of small domes in the Venera data set are examined. It is noted that, because of their numbers and widespread occurence, regardless of origin, these structures will be important in the local and global geographic interpretation of the surface. It is concluded that small domes of 20 km in diameter occur in numbers of order 10,000 on the northern quarter of the surface of Venus, and that small domes are interpreted to be predominantly low shield volcanos and to represent multiple centralized effusive eruptions of discrete volumes over finite periods. It is noted that small domes occur throughout the northern latitudes, but attain maximum regional concentrations in two areas, one located north of Thetis Regio in Akkruva Colles, and another located on the northeast flanks of Beta Regio in Guinevere Planitia. The presence of two global concentrations implies that magma production and eruption were enhanced within these two areas.

Aubele, Jayne C.↗
NASA NTRS1989

Patterns of volcanism along the southern margin of the Colorado Plateau - The Springerville field

Results from studies of the 2.1- to 0.3-my-old Springerville volcanic field are summarized, including research on geologic mapping, volume, age, chemical characterization, composition, temporal variations, and effusion and migration rates. It is found that the rocks of the field are predominantly alkali olivine and transitional basalts, with subordinate proportions of hawaiite and tholeiite. The evolution of the field is described as an early pulse of tholeiitic volcanism followed by a peak in alkali olivine basalt production in the middle of the field's eruptive history, and a late peak in evolved alkalic rock production about 0.5 my after the alkali olivine basalt peak.

Condit, Christopher D.↗