Proceedings of the Ocean Drilling Program 1992
DOI: 10.2973/odp.proc.sr.129.139.1992
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Effects of Alteration on Physical Properties of Basalts from the Pigafetta and East Mariana Basins

Abstract: Physical properties of basalts from Ocean Drilling Program Sites 800 and 801 in the Pigafetta Basin and Site 802 in the East Mariana Basin, including porosity, wet-bulk density, grain density, compressional wave velocity, and thermal conductivity, were measured aboard JOIDES Resolution during Leg 129. The ranges for the properties are large, as typified by the velocity, which varies from 3.46 to 6.59 km/s. Extensively altered basalts immediately above and below a silicified hydrothermal deposit (60-69 m sub-ba… Show more

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Cited by 12 publications
(34 citation statements)
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“…[19] Basement porosity and thermal properties assigned to various layers in the models that follow are based on observations from drilling and associated experiments [e.g., Bartetzko et al, 2001;Becker et al, 1983;Busch et al, 1992;Jarrard and Broglia, 1991;Pezard and Anderson, 1989;Shipboard Scientific Party, 2005]. The upper 100-1000 m of basement is thought to comprise the hydrothermal aquifer most responsible for advective heat loss on ridge flanks, and is assigned the highest porosity and lowest thermal conductivity (Table 1).…”
Section: Methodsmentioning
confidence: 99%
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“…[19] Basement porosity and thermal properties assigned to various layers in the models that follow are based on observations from drilling and associated experiments [e.g., Bartetzko et al, 2001;Becker et al, 1983;Busch et al, 1992;Jarrard and Broglia, 1991;Pezard and Anderson, 1989;Shipboard Scientific Party, 2005]. The upper 100-1000 m of basement is thought to comprise the hydrothermal aquifer most responsible for advective heat loss on ridge flanks, and is assigned the highest porosity and lowest thermal conductivity (Table 1).…”
Section: Methodsmentioning
confidence: 99%
“…The thermal conductivity of upper oceanic basement also tends to increase with depth, but the variations are often associated with abrupt lithologic transitions, for example, from extrusive basalt pillows to more massive flows or sills [e.g., Bartetzko et al, 2001;Busch et al, 1992;Karato, 1983]. Rapid sedimentation results in the heat flux through sediments and upper basement being suppressed, with the magnitude and depth extent of suppression depending on the sedimentation history (magnitude and duration) and on the thermal and physical properties of sediment and basement.…”
Section: Physical Basismentioning
confidence: 99%
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“…Physical properties of the upper hydrothermal zone and overlying alkali basalts have been presented and analyzed previously [ Busch et al , 1992; Wallick et al , 1992; Larson et al , 1993; Jarrard et al , 1995] and are not presented here. Our analyses focus on the tholeiitic section, first encountered on Leg 129 but mostly cored and logged during Leg 185.…”
Section: Datamentioning
confidence: 99%
“…We will not know whether conditions in upper basement are vertically conductive or advective until after data are recovered from temperature sensors deployed at depth within long-term observatories (Fisher et al, 2005). For illustrative purposes, we assume that thermal conditions in uppermost basement are conductive, with an effective thermal conductivity of 1.6 W/m·K (e.g., Becker et al, 1983;Busch et al, 1992;Karato, 1983) and a P-wave velocity of 4500 m/s (e.g., Carlson, 1998;Jacobson, 1992;Rohr, 1994).…”
Section: Estimation Of Temperatures At Depthmentioning
confidence: 99%