Paleomagnetic of basalts from the Kerguelen Plateau, supplement to: Inokuchi, Hiroo; Heider, Franz (1992): Paleolatitude of the southern Kerguelen Plateau inferred from the paleomagnetic study of late Cretaceous basalts. In: Wise, SW; Schlich, R; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 120, 89-96

• Main Authors: Inokuchi, Hiroo, Heider, Franz
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 1992
• Subjects: Event label; Sample code/label; NRM, Inclination; NRM, Intensity; Demag Type; Demagnetization step; NRM, Inclination after demagnetization; Drilling/drill rig; DSDP/ODP/IODP sample designation; Leg120; Joides Resolution; Ocean Drilling Program ODP; Indian; Kerguelen; Antarc*; Antarctica; Geomagnetic Pole
• Online Access: https://dx.doi.org/10.1594/pangaea.760162; https://doi.pangaea.de/10.1594/PANGAEA.760162

Paleomagnetic measurements were performed on 106 basalt samples collected from Holes 747C, 748C, 749C, and 750B. Basalt samples were recovered from the southern portion of the Kerguelen Plateau and the transitional zone between the northern and southern plateau in the south central Indian Ocean. The ages of basalts range from 100 to 115 Ma. In addition to the preliminary shipboard measurements (Schlich, Wise, et al., 1989, doi:10.2973/odp.proc.ir.120.1989), characteristic inclinations of the magnetization were obtained using mainly stepwise thermal demagnetization of the samples. Reliable paleomagnetic results were obtained from three sites (Sites 747, 748, and 749). The paleomagnetic inclinations of Sites 747, 748, and 749 are -51°, -63°, and -62°, respectively. The considerable differences between the paleomagnetic and present inclinations of about 70° at Sites 747, 748, and 749 indicate that displacement in the direction of the geomagnetic meridian has taken place since formation of the basalt. Shallower paleomagnetic inclinations than the present inclinations at each site imply a southward movement of the sites with respect to the geomagnetic pole. By comparing the apparent polar wander path of Antarctica with the virtual geomagnetic pole (VGP) of the Southern Kerguelen Plateau, we have concluded that no major tectonic movement has taken place between the Kerguelen Plateau and Antarctica since formation of the basalt (i.e., 100-115 Ma). The angular dispersion of the VGP for the Kerguelen Plateau is calculated as 17°.