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The hydrology of Mars: An integrate...

Hanna, Jeffrey C.

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The hydrology of Mars: An integrated climatic, tectonic, magmatic, and geodynamic approach.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	The hydrology of Mars: An integrated climatic, tectonic, magmatic, and geodynamic approach./
Author:	Hanna, Jeffrey C.
Description:	245 p.
Notes:	Adviser: Roger Phillips.
Contained By:	Dissertation Abstracts International67-10B.
Subject:	Geophysics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3238651
ISBN:	9780542926235

The hydrology of Mars: An integrated climatic, tectonic, magmatic, and geodynamic approach.
Hanna, Jeffrey C.

The hydrology of Mars: An integrated climatic, tectonic, magmatic, and geodynamic approach. - 245 p.

Adviser: Roger Phillips.

Thesis (Ph.D.)--Washington University in St. Louis, 2006.

The planet Mars exhibits abundant evidence for an active groundwater hydrology in its early history, though little is known about the underlying processes driving this activity. This study investigates the origin and nature of two of the most dramatic and enigmatic hydrological features, the outflow channels and the Meridiani Planum evaporite deposits. A hydrological model of the Martian crust is proposed, utilizing observations of terrestrial and lunar analog materials. This model is used to study the response of the aquifer to a dramatic cooling of the climate, as water is displaced in advance of the thickening cryosphere. The feedback between the pore pressure and the permeability is found to limit the resulting aquifer pressurization. A new mechanism of tectonic aquifer pressurization is then proposed to explain the outflow channels originating within extensional tectonic features, in which the tectonically generated stress-change in the crust pressurizes the aquifers in the vicinity of the faults and drives flow to the surface. This mechanism is used to explain the floods at Mangala and Athabasca Valles, and is inferred to have played prominently in the origin of the floods debauching from the Valles Marineris canyon system. Next, the origin and evolution of the outflow channel floods sourced in regions of chaotic terrain are modeled, given the initial condition of an extensive and highly pressurized aquifer. The results suggest a series of periodic floods would ensue, resulting in an erosive history dominated by the high discharge early portions of the individual floods. Finally, a model of the global hydrology of early Mars is presented, in which flow is driven by the burial of aquifers deep beneath Tharsis and the global deformation induced by Tharsis loading. The model predicts sustained groundwater upwelling at the Terra Meridiani evaporite deposits observed by the MER Opportunity Rover, as well as pressurized aquifers in the Tharsis trough where the majority of the outflow channels are found. Taken together, the results of these studies suggest that the hydrology of Mars was driven by the interaction of the groundwater system with the climatic, tectonic, magmatic, and geodynamic evolution of early Mars.

ISBN: 9780542926235Subjects--Topical Terms:

535228
Geophysics.

The hydrology of Mars: An integrated climatic, tectonic, magmatic, and geodynamic approach.
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100 1 $a Hanna, Jeffrey C. $3 1291274
245 1 4 $a The hydrology of Mars: An integrated climatic, tectonic, magmatic, and geodynamic approach.
300 $a 245 p.
500 $a Adviser: Roger Phillips.
500 $a Source: Dissertation Abstracts International, Volume: 67-10, Section: B, page: 5622.
502 $a Thesis (Ph.D.)--Washington University in St. Louis, 2006.
520 $a The planet Mars exhibits abundant evidence for an active groundwater hydrology in its early history, though little is known about the underlying processes driving this activity. This study investigates the origin and nature of two of the most dramatic and enigmatic hydrological features, the outflow channels and the Meridiani Planum evaporite deposits. A hydrological model of the Martian crust is proposed, utilizing observations of terrestrial and lunar analog materials. This model is used to study the response of the aquifer to a dramatic cooling of the climate, as water is displaced in advance of the thickening cryosphere. The feedback between the pore pressure and the permeability is found to limit the resulting aquifer pressurization. A new mechanism of tectonic aquifer pressurization is then proposed to explain the outflow channels originating within extensional tectonic features, in which the tectonically generated stress-change in the crust pressurizes the aquifers in the vicinity of the faults and drives flow to the surface. This mechanism is used to explain the floods at Mangala and Athabasca Valles, and is inferred to have played prominently in the origin of the floods debauching from the Valles Marineris canyon system. Next, the origin and evolution of the outflow channel floods sourced in regions of chaotic terrain are modeled, given the initial condition of an extensive and highly pressurized aquifer. The results suggest a series of periodic floods would ensue, resulting in an erosive history dominated by the high discharge early portions of the individual floods. Finally, a model of the global hydrology of early Mars is presented, in which flow is driven by the burial of aquifers deep beneath Tharsis and the global deformation induced by Tharsis loading. The model predicts sustained groundwater upwelling at the Terra Meridiani evaporite deposits observed by the MER Opportunity Rover, as well as pressurized aquifers in the Tharsis trough where the majority of the outflow channels are found. Taken together, the results of these studies suggest that the hydrology of Mars was driven by the interaction of the groundwater system with the climatic, tectonic, magmatic, and geodynamic evolution of early Mars.
590 $a School code: 0252.
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