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  • Other Sources  (3,717)
  • Lunar and Planetary Science and Exploration  (2,561)
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  • 1
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    In:  J. Geophys. Res., Warszawa, American Geophysical Union, vol. 103, no. B7, pp. 15,239-15,253, pp. L08304, (ISSN: 1340-4202)
    Publication Date: 1998
    Keywords: Stress ; Rock mechanics ; Fracture ; Physical properties of rocks ; Laboratory measurements ; 5104 ; Fracture ; and ; flow ; 8010 ; Structural ; geology ; Fractures ; and ; faults ; 8168 ; Tectonophysics ; Stresses--general ; 8439 ; Volcanology ; Physics ; and ; chemistry ; of ; magma ; bodies ; Muller ; JGR
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  • 2
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    In:  J. Geophys. Res., Kalamazoo, Michigan 49001, The Upjohn Company, vol. 103, no. B8, pp. 18,295-18,324, pp. L09603, (ISSN: 1340-4202)
    Publication Date: 1998
    Keywords: Elasticity ; Volcanology ; 8434 ; Volcanology ; Magma ; migration ; 8145 ; Tectonophysics ; JGR ; Physics ; of ; magma ; and ; magma ; bodies ; 8414 ; Eruption ; mechanisms
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  • 3
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    In:  Geophys. Res. Lett., New York, Conseil de l'Europe, vol. 25, no. 12, pp. 2237-2240, pp. B06307, (ISSN: 1340-4202)
    Publication Date: 1998
    Keywords: Volcanology ; Earthquake precursor: chemical (Rn, water(-level,...) ; TIDES ; Earth tides ; Physical properties of rocks ; 8135 ; Tectonophysics ; GRL ; Hydrothermal ; systems ; (8424) ; 8439 ; Volcanology ; Physics ; and ; chemistry ; of ; magma ; bodies ; 7223 ; Seismology ; Seismic ; hazard ; assessment ; and ; prediction ; 1832 ; Hydrology ; Groundwater ; transport
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  • 4
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    In:  Geophys. Res. Lett., Kobe, 1, vol. 26, no. 23, pp. 3437-3440, pp. 8010, (ISBN: 0534351875, 2nd edition)
    Publication Date: 1999
    Description: The formation of ocean crust along the midocean ridge system is volumetrically one of the most important geological processes on the surface of the earth. Volcanic eruptions along the ridge can be catastrophic events during which magma rises to the surface of the sea floor to release heat and gases into turbulent megaplumes that disrupt the overlying water column, initiate and rejuvenate hydrothermal circulation, and trigger an outpouring of microbial debris. Though these events may persist only a few weeks or months at one site, taken together, they may play a major role in the oceanic biogeochemical cycle. Axial Volcano on the Juan de Fuca Ridge has become a laboratory for the study of ephemeral aspects of sea floor volcanism, including results from expeditionary, rapid response, and permanent instrument installations. The geological context and description of the most significant magmatic event on the Juan de Fuca Ridge in the past decade is provided by Embley et al. [3425]. Dziak and Fox [3429], describe a rapid increase in the seismicity remotely monitored by the U.S. Navy hydrophone array. The increase in seismic swarms is the earliest indicator that an eruption has begun. Within hours, volcanic deflation is observed in concert with increases in the bottom water temperature due to venting. Instruments in place for the first time during such a midocean ridge volcanic event measured ground deformation and caldera subsidence resulting from the extraction of magma as described by Fox [3437] and Chadwick et al. [3441], while a coincident outpouring of hot water recorded on moored temperature sensors is described in Baker et al. [3445]. A rapid response cruise in February brought researchers to the site only 14 days after the eruption began and in the midst of winter storms. Sohn et al. [3433] describe local seismicity derived from a network of sea floor hydrophones deployed during the February cruise. Repeated measurements of helium anomalies in the water column before and after the eruption are used by Lupton et al. [3449] to fingerprint the hydrothermal plume associated with the eruption, extending a considerable distance off-axis. Water samples collected during the February 1998 cruise were analyzed for hydrothermal methane and hydrogen by McLaughlin-West et al. [3453]. They find both species to be significantly elevated near the vents and invoke microbial processes to explain the observations.
    Keywords: Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Volcanology ; 3035 ; Marine ; geology ; and ; geophysics ; Midocean ; ridge ; processes ; 8145 ; Tectonophysics ; Physics ; of ; magma ; and ; magma ; bodies ; 8419 ; Volcanology ; Eruption ; monitoring ; (7280) ; 8434 ; Magma ; migration ; GRL
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  • 5
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    In:  Geophys. Res. Lett., London, Pergamon, vol. 24, no. 13, pp. 1559-1562, pp. B05401, (ISBN: 0534351875, 2nd edition)
    Publication Date: 1997
    Keywords: Volcanology ; Stress ; Iceland ; 8145 ; Tectonophysics ; Physics ; of ; magma ; and ; magma ; bodies ; 8414 ; Volcanology ; Eruption ; mechanisms ; GRL
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  • 6
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    In:  Geophys. Res. Lett., Dordrecht, National Academy of Sciences of the USA, vol. 24, no. 15, pp. 1843-1846, pp. TC5003, (ISSN: 1340-4202)
    Publication Date: 1997
    Keywords: Iceland ; SAR ; InSAR ; Plate tectonics ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; 1209 ; Geodesy ; Gravimetry, Gravitation ; 8145 ; Tectonophysics ; Physics ; of ; magma ; and ; magma ; bodies ; 8150 ; Plate ; boundary ; general ; Massonet ; (3040) ; 3035 ; Marine ; geology ; and ; geophysics ; Midocean ; ridge ; processes ; Volcanology ; GRL
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  • 7
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    In:  Geophys. Res. Lett., Hannover, Dt. Geophys. Ges. e. V., vol. 25, no. 10, pp. 1549-1552, pp. 1058, (ISSN: 1340-4202)
    Publication Date: 1998
    Keywords: Volcanology ; Modelling ; InSAR ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; 1243 ; Geodesy ; and ; gravity ; Space ; geodetic ; surveys ; 3210 ; Mathematical ; geophysics ; (new ; field) ; Modeling ; 8145 ; Tectonophysics ; Physics ; of ; magma ; and ; magma ; bodies ; 8499 ; Volcanology ; General ; or ; miscellaneous ; GRL
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  • 8
    Publication Date: 2011-08-24
    Description: It is often argued that substantially more carbon dioxide and water were degassed from the martian interior than can be found at present in the atmosphere, polar caps and regolith. Calculations have shown that atmospheric escape cannot account for all of the missing volatiles. Suggestions that carbon dioxide is stored as marine or lacustrine deposits, are challenged by Earth-based and spacecraft remote-sensing data. Moreover, recent modelling of the martian atmosphere suggests that rainfall or open bodies of water are in any case unlikely to have persisted for extended periods of time. Hydrothermal carbonates therefore provide a possible solution to this dilemma. Using an accessible terrestrial system (Iceland) as a guide to the underlying processes, and a host rock composition inferred from the least-altered martian meteorite, we present a geochemical model for the formation of carbonates in possible martian hydrothermal systems. Our results suggest that an extensive reservoir of carbonate minerals--equivalent to an atmospheric pressure of carbon dioxide of at least one bar--could have been sequestered beneath the surface by widespread hydrothermal activity in the martian past.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Nature (ISSN 0028-0836); Volume 377; 6548; 406-8
    Format: text
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  • 9
    Publication Date: 2011-08-24
    Description: The first 18 tracks of laser altimeter data across the northern hemisphere of Mars from the Mars Global Surveyor spacecraft show that the planet at latitudes north of 50 degrees is exceptionally flat; slopes and surface roughness increase toward the equator. The polar layered terrain appears to be a thick ice-rich formation with a non-equilibrium planform indicative of ablation near the periphery. Slope relations suggest that the northern Tharsis province was uplifted in the past. A profile across Ares Vallis channel suggests that the discharge through the channel was much greater than previously estimated. The martian atmosphere shows significant 1-micrometer atmospheric opacities, particularly in low-lying areas such as Valles Marineris.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Science (ISSN 0036-8075); Volume 279; 5357; 1686-92
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  • 10
    Publication Date: 2011-08-24
    Description: The age of secondary carbonate mineralization in the martian meteorite ALH84001 was determined to be 3.90 +/- 0.04 billion years by rubidium-strontium (Rb-Sr) dating and 4.04 +/- 0.10 billion years by lead-lead (Pb-Pb) dating. The Rb-Sr and Pb-Pb isochrons are defined by leachates of a mixture of high-graded carbonate (visually estimated as approximately 5 percent), whitlockite (trace), and orthopyroxene (approximately 95 percent). The carbonate formation age is contemporaneous with a period in martian history when the surface is thought to have had flowing water, but also was undergoing heavy bombardment by meteorites. Therefore, this age does not distinguish between aqueous and impact origins for the carbonates.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Science (ISSN 0036-8075); Volume 286; 5437; 90-4
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