1. THE CIRCUM-HELLAS VOLCANIC PROVINCE (CHVP)
Leon Manfredi
April 18, 2009

2. THE CIRCUM-HELLAS VOLCANIC PROVINCE (CHVP)
Overview
Covers > 4.86 million km2
Contains the six oldest central vent volcanoes on Mars (3.8 to 3.4 Ga)
Modified by aeolian and periglacial processes

3. OBJECTIVE Determine the full extent of volcanic province
Determine age of units

4. APPROACH Map the key units “crater counts” MOLA Shaded Relief
THEMIS Day IR Image

5. UNITS ANALYZED

6. AGES OF KEY UNITS
Based on alogrithm of Hartmann & Neukum (2001)

7. THE CIRCUM-HELLAS VOLCANIC PROVINCE (CHVP)
Summary
CHVP covers ≈ 4.86 x 106 km2
(Elysium Province ≈ 4.9 x 106 km2, Tharsis Province ≈ 2 x 107 km2)
Represents the oldest “central” volcanism on Mars
Includes substantial “ridged plains” volcanism
Ages range from 3.4 Ga to 3.8 Ga

8. ACKNOWLEDGEMENTS Dr. Ronald Greeley Dr. David Williams
JMARS Development Team
Chris Edwards