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Christiansen, Lizet B; Iturrino, Gerardo J (2004): (Table T1) Physical properties of minicores from ODP Leg 193 sites, PACMANUS field. PANGAEA, https://doi.org/10.1594/PANGAEA.779285, Supplement to: Christiansen, LB; Iturrino, GJ (2004): Core-scale permeability of an actively venting, felsic-hosted hydrothermal system: the PACMANUS hydrothermal field. In: Barriga, FJAS; Binns, RA; Miller, DJ; Herzig, PM (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 193, 1-19, https://doi.org/10.2973/odp.proc.sr.193.202.2004

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Abstract:
Permeability of the ocean crust is one of the most crucial parameters for constraining submarine fluid flow systems. Active hydrothermal fields are dynamic areas where fluid flow strongly affects the geochemistry and biology of the surrounding environment. There have been few permeability measurements in these regions, especially in felsic-hosted hydrothermal systems. We present a data set of 38 permeability and porosity measurements from the PACMANUS hydrothermal field, an actively venting, felsic hydrothermal field in the eastern Manus Basin. Permeability was measured using a complex transient method on 2.54-cm minicores. Permeability varies greatly between the samples, spanning over five orders of magnitude. Permeability decreases with both depth and decreasing porosity. When the alteration intensity of individual samples is considered, relationships between depth and porosity and permeability become more clearly defined. For incompletely altered samples (defined as >5% fresh rock), permeability and porosity are constant with depth. For completely altered samples (defined as <5% fresh rock), permeability and porosity decrease with depth. On average, the permeability values from the PACMANUS hydrothermal field are greater than those in other submarine environments using similar core-scale laboratory measurements; the average permeability, 4.5 x 10-16 m**2, is two to four orders of magnitude greater than in other areas. Although the core-scale permeability is higher than in other seafloor environments, it is still too low to obtain the fluid velocities observed in the PACMANUS hydrothermal field based on simplified analytical calculations. It is likely that core-scale permeability measurements are not representative of bulk rock permeability of the hydrothermal system overall, and that the latter is predominantly fracture controlled.
Project(s):
Coverage:
Median Latitude: -3.724900 * Median Longitude: 151.672400 * South-bound Latitude: -3.728300 * West-bound Longitude: 151.669800 * North-bound Latitude: -3.720600 * East-bound Longitude: 151.675100
Date/Time Start: 2000-11-18T17:30:00 * Date/Time End: 2000-12-30T04:00:00
Minimum DEPTH, sediment/rock: 9.78 m * Maximum DEPTH, sediment/rock: 372.34 m
Event(s):
193-1188A * Latitude: -3.728300 * Longitude: 151.669900 * Date/Time Start: 2000-11-18T17:30:00 * Date/Time End: 2000-11-22T08:30:00 * Elevation: -1640.2 m * Penetration: 211.6 m * Recovery: 21.93 m * Location: Bismarck Sea * Campaign: Leg193 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 23 cores; 211.6 m cored; 0 m drilled; 10.4 % recovery
193-1188F * Latitude: -3.728100 * Longitude: 151.669800 * Date/Time Start: 2000-12-29T15:15:00 * Date/Time End: 2000-12-30T04:00:00 * Elevation: -1641.7 m * Penetration: 386.7 m * Recovery: 30.89 m * Location: Bismarck Sea * Campaign: Leg193 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 45 cores; 168.7 m cored; 218 m drilled; 18.3 % recovery
193-1189A * Latitude: -3.720700 * Longitude: 151.674900 * Date/Time Start: 2000-11-22T08:30:00 * Date/Time End: 2000-11-23T20:45:00 * Elevation: -1690.2 m * Penetration: 125.8 m * Recovery: 8.58 m * Location: Bismarck Sea * Campaign: Leg193 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 13 cores; 125.8 m cored; 0 m drilled; 6.8 % recovery
Comment:
Current sediment depth is given in mbsf. Note that permeability measurements were made along the length of the minicores; therefore, the resultant permeability values represent fluid flow along the horizontal axis. No vertical permeability measurements were made because of the limitations in the amount of core recovered. Minerals come from thin section analyses (Binns, Barriga, Miller, et al., 2002, doi:10.2973/odp.proc.ir.193.2002).
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEvent
2Sample code/labelSample labelChristiansen, Lizet BODP sample designation
3PiecePieceChristiansen, Lizet B
4DEPTH, sediment/rockDepthmGeocode
5Lithologic unit/sequenceUnitChristiansen, Lizet B
6Permeability (earth science)k10-12 m2Christiansen, Lizet B
7Porosity, fractionalPoros fracChristiansen, Lizet BNew England Research, Inc. laboratory
8Porosity, fractionalPoros fracChristiansen, Lizet BODP shipboard technique
9VesicleVesicle%Christiansen, Lizet B#0 = traces
10Velocity, compressional waveVpm/sChristiansen, Lizet Bvelocity type uncertain
11MineralsMinerals%Christiansen, Lizet Bfresh
12AnhydriteAnh%Christiansen, Lizet B
13QuartzQz%Christiansen, Lizet B
14CristobaliteCrs%Christiansen, Lizet Bincluding silica
15Clay mineralsClay min%Christiansen, Lizet B
16Sulfide mineralsSulf%Christiansen, Lizet B#0 = traces
17AlterationAlterationChristiansen, Lizet BAlteration intensity classifications: fresh = <2% alteration, slight = 2%-10%, high = 40%-80%, very high = 80%-95%, complete = 95%-100%
18Sample commentSample commentChristiansen, Lizet B
Size:
445 data points

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