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U.S. Geological Survey Scientific Investigations Map 3025

Prepared for the National Aeronautics and Space Administration

Geologic Map of the Niobe Planitia Quadrangle (V–23), Venus

By Vicki L. Hansen

Introduction

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The Niobe Planitia quadrangle (V–23) encompasses approximately 8,000,000 km2 of the Venusian equatorial region extending from lat 0° to 25° N. and from long 90° to 120° E. (approximately 9,500 15-minute quadrangles on Earth). The map area lies along the north margin of the equatorial highland, Aphrodite Terra (V–35), and extends into the lowland region to the north, preserving a transition from southern highlands to northern lowlands (figs. 1, 2, map sheet). The northern parts of the crustal plateau, Ovda Regio and Haasttse-baad Tessera, mark the south margin of the map area; Niobe and Sogolon Planitiae make up the lowland region. The division between Niobe and Sogolon Planitiae is generally topographic, and Sogolon Planitia forms a relatively small elongate basin. Mesolands, the intermediate topographic level of Venus, are essentially absent or represented only by Gegute Tessera, which forms a slightly elevated region that separates Niobe Planitia from Llorona Planitia to the east (V–24). Lowlands within the map area host five features currently classified as coronae: Maya Corona (lat 23° N., long 97° E.) resides to the northwest and Dhisana, Allatu, Omeciuatl, and Bhumiya Coronae cluster loosely in the east-central area. Lowlands extend north, east, and west of the map area.

Mapping the Niobe Planitia quadrangle (V–23) provides an excellent opportunity to examine a large tract of lowlands and the adjacent highlands with the express goal of clarifying the processes responsible for resurfacing this part of Venus and the resulting implications for Venus evolution. Although Venus lowlands are widely considered to have a volcanic origin, lowlands in the map area lack adjacent coronae or other obvious volcanic sources.

First posted August 10, 2009

  • This report is also available in print from:

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    telephone: 888 ASK-USGS; e-mail: infoservices@usgs.gov

For additional information:
Contact Astrogeology Research Program staff
Astrogeology Science Center
U.S. Geological Survey
2255 N. Gemini Dr.
Flagstaff, AZ 86001
http://astrogeology.usgs.gov/

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Suggested citation:

Hansen, Vicki L., 2009, Geologic map of the Niobe Planitia quadrangle (V-23), Venus: U.S. Geological Survey Scientific Investigations Map 3025, scale 1:5,000,000, 22 p.



Contents

The Magellan Mission

Niobe Planitia quadrangle

Implications for Venus lowland resurfacing processes

Summary

References cited

12 Figures

2 Tables

Plate


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