Mathematics – Logic
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm...v42a04h&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #V42A-04
Mathematics
Logic
5475 Tectonics (8149), 5480 Volcanism (8450), 6225 Mars, 8450 Planetary Volcanism (5480)
Scientific paper
The Hesperian Period is a critical phase in the evolution of volcanic processes and new MOLA data provide insight into their nature and evolution. During the Hesperian, globally distributed ridged plains of volcanic origin were emplaced and deformed, significant regional volcanism took place in Tharsis, Syria, and Elysium, radial and concentric deformation occurred around Tharsis, the majority of the outflow channels formed, and extensive resurfacing and infilling of the northern lowlands took place. Formation of regional volcanic plains and associated paterae occurred in Alba, Hesperia Planum, Syrtis Major Planum, and Malea Planum. Important unanswered questions include: Does the global formation of ridged plains (Hr) represent a specific phase of volcanic activity or simply the tail end of declining global volcanism related to early high heat flux? What is the relationship between the global volcanism of Hr and the regional volcanism of Tharsis and Elysium? What is the temporal and genetic relationship of highland paterae, Syria Planum and Tharsis Montes? Is there a genetic relationship between highland paterae and basin structure as suggested by their location? Do changes in highland paterae morphology and inferred environment reflect near-surface volatile depletion? What is the relationship of the apparent global contraction, represented by wrinkle ridges, to the change in style of volcanism from widely distributed to regional? What is the relationship of the Tharsis tholi and small paterae to the Late Hesperian Tharsis plains? Why is Syria Planum so prominent topographically, but so subtle in terms of patera or caldera-like structures? What is the relationship between the activity at Syria and Tharsis Montes? What is the relationship of the activity in Tempe Terra to that of the rest of Tharsis at this time? What is the relationship between the earlier (Hesperian) and later (Amazonian) stages of volcanism in Tharsis and Elysium in terms of volume, area, and style? Mars Global Surveyor data have provided an opportunity to reassess the nature of geological units and their stratigraphic relationships. Information from MOLA on the geometry and volumes of these deposits, their stratigraphic relationships, and the morphometry of landforms, has lead to new insight into the flux and resurfacing history during this critical time.
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