Overlapping Lobate Lava Flows in Daedalia Planum
NASA/JPL/UArizona
Overlapping Lobate Lava Flows in Daedalia Planum
ESP_037641_1560  Science Theme: Geologic Contacts/Stratigraphy
Lava flows south of Arsia Mons in Daedalia Planum transition from younger flows with elongated, sinuous morphologies to the northeast, to older, broader lobes and sheet flows to the southwest. (The time scale we’re talking about is approximately 100 million to 1 billion years.) At the southern margin of the Tharsis region, older, probably 3-billion year old volcanic plains have been identified where Tharsis flows contact the ancient highlands.

The high-resolution of HiRISE images allows for reconstruction of complex volcanic surfaces, including delineation of individual flow lobes and superposition relationships within a flow field. This image shows a contact between two of the younger, elongate flows to the northeast. Populations of small, superposed impact craters can be used to derive relative and absolute age constraints for individual flows and flow sequences.

Written by: Dan Berman  (10 September 2014)
 
Acquisition date
07 August 2014

Local Mars time
15:48

Latitude (centered)
-23.769°

Longitude (East)
233.169°

Spacecraft altitude
253.2 km (157.4 miles)

Original image scale range
25.5 cm/pixel (with 1 x 1 binning) so objects ~77 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
7.3°

Phase angle
68.1°

Solar incidence angle
61°, with the Sun about 29° above the horizon

Solar longitude
174.3°, Northern Summer

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  23.2°
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POSTSCRIPT
NASA’s Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, Calif., manages the Mars Reconnaissance Orbiter for NASA’s Science Mission Directorate, Washington. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona.