FN Archimer Export Format
PT J
TI Coring induced sediment fabrics at IODP Expedition 347 Sites M0061 and M0062 identified by anisotropy of magnetic susceptibility (AMS): criteria for accepting palaeomagnetic data
BT 
AF Snowball, I
   Almqvist, B
   Lougheed, B C
   Wiers, S
   Obrochta, S
   Herrero-Bervera, E
AS 1:1;2:1;3:2;4:1;5:3;6:4;
FF 1:;2:;3:;4:;5:;6:;
C1 Department of Earth Sciences, Uppsala University, Sweden
   Laboratoire des Sciences du Climat et de l'Environment, LSCE/IPSL, Laboratoire CNRS-CEA-UVSQ, France
   Graduate School of International Resource Science, Akita University, Japan
   School of Ocean Earth Science and Technology (SOEST) within the Hawaii Institute of Geophysics and Planetology (HIGP) of the University of Hawaii at Manoa
C2 UNIV UPPSALA, SWEDEN
   LSCE, FRANCE
   UNIV AKITA, JAPAN
   UNIV HAWAII MANOA, USA
IF 2.574
TC 6
UR https://archimer.ifremer.fr/doc/00481/59233/61937.pdf
   https://archimer.ifremer.fr/doc/00481/59233/61938.pdf
   https://archimer.ifremer.fr/doc/00481/59233/61939.pdf
LA English
DT Article
DE ;Magnetic fabrics and anisotropy;Palaeomagnetic secular variation;Palaeomagnetism
AB Anisotropy of magnetic susceptibility data obtained from discrete sub-samples recovered from two Integrated Ocean Drilling Program sites (Expedition 347 sites M0061 and M0062 in the Baltic Sea) by an Advanced Piston Corer are compared to results obtained on sub-samples recovered by replicate 6 m long Kullenberg piston cores. Characteristic natural remanence directions were obtained from the total of 1097 sub-samples using principal component analyses. The three principal anisotropy axes of sub-samples taken from Advanced Piston Core liners align to the sub-sample axes, with the maximum axis (K1) parallel to the split core surfaces, possibly caused by outwards relaxation of the core-liners after splitting. A second anomalous anisotropy fabric is characterized by steep values of the angular difference between the inclination of the minimum anisotropy axes (K3) and that expected for horizontal bedding (90°). This fabric is confined to the upper 1–2 m of the Kullenberg cores and specific sections of the advanced piston cores, and we attribute it to conical deformation caused by either excessive penetration speeds and downwards dragging of sediment along the edge of the liner or stretching caused by undersampling. By using our data in an example, we present a protocol to accept palaeomagnetic secular variation data that uses (i) a threshold 90-K3 value of 15°, combined with a modelled, locally applicable minimum inclination of 65° and (ii) an A95 cone of confidence based on Fisher statistics applied to virtual geomagnetic pole distributions. 
PY 2019
PD MAY
SO Geophysical Journal International
SN 0956-540X
PU Oxford University Press (OUP)
VL 217
IS 2
UT 000465608000024
BP 1089
EP 1107
DI 10.1093/gji/ggz075
ID 59233
ER

EF