Mars Tharsis region - Volcanotectonic events in the stratigraphic recordIt is pointed out that the most recent volcanism and much of the oldest tectonic activity on Mars have apparently occurred within the Tharsis region. Detailed geologic mapping from Viking images has provided new information on the evolutionary history of the region. The eruptive sequence and areal extent of lava flows in the Tharsis region have been defined by stratigraphic studies and crater counts made on individual flow units. Faults and fractures transecting these units provide a record of changing tectonic intensity during the period of high volcanic activity. Volcanism began with the resurfacing of basement rocks early in the history of the region and continued without large interruptions through nine major eruptive episodes. Volcanic centers shifted from place to place but resurgent activity occurred at several volcanoes. Volcanism culminated during the foration of large shield volcanoes along Tharsis Montes and thereafter appears to have gradually declined.
Document ID
19820038855
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Scott, D. H. (Geological Survey Flagstaff, AZ, United States)
Tanaka, K. L. (U.S. Geological Survey Flagstaff, AZ, United States)