Magnetic properties of the oceanic igneous rocks (Table 1)

• Main Authors: Wang, Daming, Van der Voo, Rob
• Format: Dataset
• Language: English
• Published: PANGAEA 2004
• Subjects: 25-249; 27-261; 29-283; 38-336; 49-412A; 52-418A; 58-446; 61-462; 63-469; 63-471; 65-483A; 81-553A; Antarctic Ocean/Tasman Sea; Coercivity; Curie temperature; Deep Sea Drilling Project; DEPTH; sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Elevation of event; Event label; Glomar Challenger; Hysteresis; coercivity of remanence/coercivity; saturation magnetization; saturation magnetization/ saturation remanence; Indian Ocean//PLAIN; Indian Ocean//RIDGE; Latitude of event; Leg25; Leg27; Leg29; Leg38; Leg49; Leg52; Leg58; Leg61; Leg63; Leg65; Leg81; Longitude of event; North Atlantic/CONT RISE; North Atlantic/FRACTURE ZONE; North Atlantic/Norwegian Sea; North Atlantic/PLATEAU; Antarctic; Antarctic Ocean; Indian; Norwegian Sea; Antarc*; North Atlantic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.715035; https://doi.org/10.1594/PANGAEA.715035

Hysteresis measurements have been carried out on a suite of ocean-floor basalts with ages ranging from Quaternary to Cretaceous. Approximately linear, yet separate, relationships between coercivity (Bc) and the ratio of saturation remanence/saturation magnetization (Mrs/Ms) are observed for massive doleritic basalts with low-Ti magnetite and for pillow basalts with multi-domain titanomagnetites (with x= 0.6). Even when the MORB has undergone lowtemperature oxidation resulting in titanomaghemite, the parameters are still distinguishable, although offset from the trend for unoxidized multidomain titanomagnetite. The parameters for these iron oxides with different titanium content reveal contrasting trends that can be explained by the different saturation magnetizations of the mineral types. This plot provides a previously underutilized and non-destructive method to detect the presence of low-titanium magnetite in igneous rocks, notably MORB.