Reflection microscopy and geochemistry at DSDP Leg 55 Holes
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
1980
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| _version_ | 1867171366844760064 |
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| author | Kono, Masaru Clague, David A Larson, Edwin E |
| author_facet | Kono, Masaru Clague, David A Larson, Edwin E |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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). |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_823371 |
| institution | PANGAEA |
| language | en |
| publishDate | 1980 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Reflection microscopy and geochemistry at DSDP Leg 55 Holes Kono, Masaru Clague, David A Larson, Edwin E 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 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). |
| title | Reflection microscopy and geochemistry at DSDP Leg 55 Holes |
| topic | 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 |
| url | https://doi.org/10.1594/PANGAEA.823371 |