Data Description

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Citation:
Meissl, Sandra; Behrmann, Jan Hinrich; Franke, C (2011): (Table 1) Magnetic susceptibility from IODP Hole 308-U1322B. doi:10.1594/PANGAEA.787621,
Supplement to: Meissl, Sandra; Behrmann, Jan Hinrich; Franke, Christine (2011): Magnetic fabrics in Quaternary sediments, Ursa Basin, northern Gulf of Mexico record transport processes, compaction and submarine slumping. Marine Geology, 286(1-4), 51-64, doi:10.1016/j.margeo.2011.05.007
Abstract:
The continental slope of the northern Gulf of Mexico seaward of the Mississippi Delta is characterized by very rapid Quaternary sedimentation. Thick sequences of underconsolidated muds and mudstones are present, which are severely overpressured. In the Ursa Basin, Site U1322 of the Integrated Ocean Drilling Program (IODP) provided an excellent coring record of interleaved fine-grained turbidites and hemipelagic sediments, in part severely affected by submarine slumping and sliding after deposition. Cores were continuously sampled and analyzed for anisotropy of magnetic susceptibility (AMS), to elucidate the effects of different transport mechanisms and degree of settling and consolidation on magnetic fabric properties. Generally AMS ellipticity increases with depth irrespective of transport mode, due to loss of porosity. Samples from slumped mass transport deposits (MTD), however, have higher AMS if compared to immediately overlying nonslumped material. MTD samples dominantly show triaxial magnetic fabrics whereas those found in nonslumped sediments are much more oblate. Long axes of the fabric ellipsoid reflect the direction of eastward to southward suspension transport in samples not overprinted by sliding or slumping. Short ellipsoid axes in non-slumped material are vertical, and thus parallel to the axis of maximum uniaxial shortening. In the MTD samples, many short ellipsoid axes are inclined, reflecting an overprint of the uniaxial shortening by bedparallel shearing induced by the slumping. Shear and MTD transport direction deduced from the fabrics is top to- SE, downslope along the morphological axis of Ursa Basin. Generally we show that magnetic fabrics of muds and mudstones are sensitive recorders of sedimentary and tectonic processes, and can be used to reconstruct essential
Project(s):
Coverage:
Latitude: 28.001657 * Longitude: -89.000417
Minimum DEPTH, sediment/rock: 1.76 m * Maximum DEPTH, sediment/rock: 233.86 m
Event(s):
308-U1322B * * Latitude: 28.001657 * Longitude: -89.000417 * Elevation: -1319.5 m * Recovery: 236.79 m * Campaign: Exp308 (Gulf of Mexico Hydrogeology) * * Basis: Joides Resolution * * Device: Drilling/drill rig (DRILL) * * Comment: 29 cores; 234.5 m cored; 101 % recovered; 0 m drilled; 234.5 m penetrated
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Sample code/label *LabelMeissl, Sandra *ODP sample designation *
2DEPTH, sediment/rock *DepthmGeocode – mbsf
3Unit *UnitMeissl, Sandra *
4Sample, optional label/labor no *Lab noMeissl, Sandra *
5Magnetic tool face angle *Agl MTFdegMeissl, Sandra *
6Susceptibility *Susceptsensor valuesMeissl, Sandra *Susceptibility unit Kappabridge KLY-2 *
7Principle axes K1 of normalized anisotropy tensor *K maxMeissl, Sandra *Susceptibility unit Kappabridge KLY-2 *
8Principle axes K2 of normalized anisotropy tensor *K intMeissl, Sandra *Susceptibility unit Kappabridge KLY-2 *
9Principle axes K3 of normalized anisotropy tensor *K minMeissl, Sandra *Susceptibility unit Kappabridge KLY-2 *
10Declination of principle axis K1 *D(Kmax)degMeissl, Sandra *corrected *
11Inclination of principle axis K1 *I(Kmax)degMeissl, Sandra *corrected *
12Declination of principle axis K2 *D(Kint)degMeissl, Sandra *corrected *
13Inclination of principle axis K2 *I(Kint)degMeissl, Sandra *corrected *
14Declination of principle axis K3 *D(Kmin)degMeissl, Sandra *corrected *
15Inclination of principle axis K3 *I(Kmin)degMeissl, Sandra *corrected *
16Anisotropy-magnetic susceptibility, factor L, lineation *AMS factor LMeissl, Sandra *Susceptibility unit Kappabridge KLY-2 *k(max)/k(int)
17Anisotropy-magnetic susceptibility, factor F, foliation *AMS factor FMeissl, Sandra *Susceptibility unit Kappabridge KLY-2 *k(int)/k(min)
18Anisotropy-magnetic susceptibility, factor P, anisotropy degree *AMS factor PMeissl, Sandra *Susceptibility unit Kappabridge KLY-2 *k(max)/k(min)
19Shape of susceptibility *TMeissl, Sandra *Susceptibility unit Kappabridge KLY-2 *2*ln k(int)/k(min)/ln k(max)/k(min-1)
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3564 data points

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