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U.S. Geological Survey Scientific Investigations Map 3165

Prepared for the National Aeronautics and Space Administration

Geologic Map of the Themis Regio Quadrangle (V–53), Venus

By Ellen R. Stofan and Antony W. Brian

Thumbnail of and link to report PDF (13.1 MB)Introduction

The Themis Regio quadrangle (V–53), Venus, has been geologically mapped at 1:5,000,000 scale as part of the NASA Planetary Geologic Mapping Program. The quadrangle extends from lat 25° to 50° S. and from long 270° to 300° E. and encompasses the Themis Regio highland, the surrounding plains, and the southernmost extension of Parga Chasmata. Themis Regio is a broad regional topographic high with a diameter of about 2,000 km and a height of about 0.5 km that has been interpreted previously as a hotspot underlain by a mantle plume. The Themis rise is dominated by coronae and lies at the terminus of the Parga Chasmata corona chain. Themis Regio is the only one of the three corona-dominated rises that contains significant extensional deformation. Fractures and grabens are much less common than along the rest of Parga Chasmata and are embayed by corona-related flows in places. Rift and corona formation has overlapped in time at Themis Regio.

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For additional information:
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http://astrogeology.usgs.gov/

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Suggested citation:

Stofan, E.R., and Brian, A.W., 2012, Geologic map of the Themis Regio quadrangle (V–53), Venus: U.S. Geological Survey Scientific Investigations Map 3165, pamphlet 13 p., 1 sheet, 1:5,000,000 scale. (Available at https://pubs.usgs.gov/sim/3165/.)




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