(Table T1) Magnetic properties of MORB from ODP Leg 187 sites ...

• Main Authors: Shau, Yen-Hong, Torii, Masayuki, Horng, Chorng-Shern, Liang, Wen-Tzong
• Format: Dataset
• Language: English
• Published: PANGAEA 2004
• Subjects: Event label; Sample code/label; Sample ID; Sample comment; Depth, relative; NRM, Intensity; Magnetic susceptibility, volume; Hysteresis, saturation remanence, per unit volume; Hysteresis, saturation magnetization, per unit volume; Hysteresis, saturation magnetization/ saturation remanence; Coercive force; Coercivity of remanence; Coercivity of remanence/coercive force; Curie temperature; Drilling/drill rig; DSDP/ODP/IODP sample designation; Magnetometer, spinner SMD-88; Bartington MS2 magnetic susceptibility meter; Magnetometer; Leg187; Joides Resolution; Ocean Drilling Program ODP; Antarctic; Pacific; Indian; Southeast Indian Ridge; Australian-Antarctic Discordance; Antarc*
• Online Access: https://dx.doi.org/10.1594/pangaea.780754; https://doi.pangaea.de/10.1594/PANGAEA.780754

The core samples of mid-ocean-ridge basalts (including Indian and Pacific type) recovered from the Southeast Indian Ridge (SEIR) area near the Australian Antarctic Discordance during Ocean Drilling Program Leg 187 were studied using rock magnetism, mineralogy, and petrography methods. On the basis of thermomagnetic analyses and low-temperature magnetometry, the dominant magnetic carrier in most of the basalt samples (pillow basalts) is characterized as titanomaghemite, which presumably formed by low-temperature oxidation of primary titanomagnetite. Some samples from unaltered massive basalts contain nearly unoxidized titanomagnetite as the main magnetic mineral. A metadiabase sample showing greenschist facies metamorphism contains magnetic minerals dominated by magnetite. The pillow basalts contain titanomaghemite ranging from stable single-domain to pseudosingle-domain (PSD) grains, and the majority are characterized by a single stable component of remanence. The massive basalts show hysteresis features of ... : Mantle province and sample depth data are from Shipboard Scientific Party (2001, doi:10.2973/odp.proc.ir.187.101.2001). ...