Mathematics – Logic
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusm.p21a..02z&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #P21A-02
Mathematics
Logic
5470 Surface Materials And Properties, 5475 Tectonics (8149), 5480 Volcanism (8450), 6295 Venus
Scientific paper
A preliminary geologic map of the the Bellona Fossae (V15) quadrangle on Venus was produced as part of the NASA-funded planetary mapping program. Geologic interpretations are based primarily on the basis of morphology, texture, radar reflectance, and relative stratigraphy derived from Magellan Synthetic Aperture Radar (SAR) images, based on FMAP mosaics showing SAR data at 75 m/pixel resolution, and compiled on a digital base map at 1:5M scale produced by the U.S. Geological Survey. This quadrangle covers approximately 5 million square kilometers of the northern lowlands of Venus, and it includes the Bellona Fossae and Fee Fossae fracture systems of western Kawelu Planitia and northern Ulfrun Regio, along with an arcuate chain of volcano-tectonic centers called coronae (e.g., Ki and Tituba Coronae). Exposed materials are dominated by relatively featureless regional plains and several centers of lobate plains (e.g., Uzume Fluctus) interpreted to be lava flow fields emplaced by effusion from separate vents. Based on stratigraphic relationships at unit contacts, the oldest exposed material units are isolated patches of complex-faulted tessera terrain, restricted to the eastern and southwestern margins of the quadrangle. Relatively small exposures of lineated plains, mountain belt, ridged plains, and dark plains materials are scattered throughout the quadrangle, with only a few impact craters and their associated ejecta and impact-induced flows (e.g., Mumtaz-Mahal crater) representing the latest materials. The tectonism associated with the coronae appears to predate the regional plains for the most part, but individual coronae are the source for lobate plains volcanism which implies that activity at these structural features encompasses much of the time span portrayed in the regional stratigraphy. Northeast-southwest-oriented lineaments exposed in Bellona Fossae not only are generally coincident with the coronae structures, but also cut patches of the stratigraphically late lobate plains units. Extensional tectonism evident in the north-south-oriented graben and lineaments of Fea Fossae cut both regional and lobate plains, and is associated with some of the greatest relief in the quadrangle. The general history portrayed in this quadrangle is consistent with published maps and reports of adjacent portions of the northern lowlands of Venus.
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