Reflection microscopy and geochemistry at DSDP Leg 55 Holes

DOI

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).

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

Identifier
DOI https://doi.org/10.1594/PANGAEA.823371
Related Identifier IsSupplementTo https://doi.org/10.2973/dsdp.proc.55.126.1980
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.823371
Provenance
Creator Kono, Masaru; Clague, David A; Larson, Edwin E
Publisher PANGAEA
Publication Year 1980
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Resource Type Supplementary Publication Series of Datasets; Collection
Format application/zip
Size 6 datasets
Discipline Earth System Research
Spatial Coverage (170.020W, 37.988S, 170.598E, 44.777N); North Pacific/SEDIMENT POND; North Pacific/TERRACE; North Pacific/SEAMOUNT
Temporal Coverage Begin 1977-08-01T00:00:00Z
Temporal Coverage End 1977-08-16T00:00:00Z