Unknown
PANGAEA
In:
Supplement to: Kono, Masaru; Clague, David A; Larson, Edwin E (1980): Fe-Ti oxide mineralogy of DSDP Leg 55 basalts. In: Jackson, ED; Koisumi, I; et al., (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 55, 639-652, https://doi.org/10.2973/dsdp.proc.55.126.1980
Publication Date:
2023-06-27
Description:
Magnetic properties of volcanic rocks are controlled mainly by the physical and chemical state of their constituent ferromagnetic minerals. The most important parameters determining magnetic properties are concentration, composition, grain size, and oxidation state. In sea floor basalts, the main ferromagnetic minerals are titanomagnetites which are either unoxidized or, more commonly, have undergone various degrees of posteruptive low-temperature oxidation to become cationdeficient titanomagnetites, or titanomaghemites. The effects of this low-temperature alteration are seen in the increase of Curie temperature and decrease of saturation magnetization and lattice parameter of ferromagnetic minerals (Readman and O'Reilly, 1972). It is now believed that titanomaghemitization of newly formed mid-ocean ridge crust proceeds with a time constant of about 1 m.y., accompanying drastic decrease of the intensity of the natural remanent magnetization (NRM) (Johnson and Atwater, 1977).
Keywords:
55-430A; 55-432A; 55-433A; 55-433B; 55-433C; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg55; North Pacific/SEAMOUNT; North Pacific/SEDIMENT POND; North Pacific/TERRACE
Type:
Dataset
Format:
application/zip, 6 datasets
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