Date of Award

Fall 1985

Document Type


Degree Name

Master of Science (MS)


Ocean & Earth Sciences



Committee Director

Ramesh Venkatakrishnan

Committee Member

G. Richard Whittecar

Committee Member

Randall S. Spencer

Call Number for Print

Special Collections LD4331.G4A52


Lineament studies conducted for the Central Tharsis Region of Mars (JOON and JOOS latitude; 450w to 157.50W longitude) indicate two major events controlled the formation of the Tharsis Dome: 1) a pre-Tharsis fracture system consisting of North-West (3150) trending fractures; and 2) a Tharsian fracture system containing North-South (355°) and East-West (275°) trending fractures. The North-West (3150) trending fractures represent a crustal weakness zone which controlled the early formation of the Tharsis Dome. Analytical studies suggest four centers of uplift: 1) 6°N, 124°W; 2) 0.5°N, 114°W; 3) 5°S, 105°W; and 4) 7°S, 104°W. Each of these uplifting centers is associated with a radial fracture pattern in the Tharsis region of Mars.

Two models explain the tectonic evolution of the Tharsis region-multicentered doming of the crust, and a migrating hotspot.


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