Bowles, Julie (2007): Data report; revised magnetostratigraphy and magnetic mineralogy of sediments from Walvis Ridge, Leg 208

Leg/Site/Hole:
ODP 208
ODP 208 1262
ODP 208 1267
Identifier:
2007-087739
georefid

10.2973/odp.proc.sr.208.206.2006
doi

Creator:
Bowles, Julie
Scripps Institution of Oceanography, La Jolla, CA, United States
author

Identification:
Data report; revised magnetostratigraphy and magnetic mineralogy of sediments from Walvis Ridge, Leg 208
2007
In: Kroon, Dick, Zachos, James C., Blum, Peter, Bowles, Julie, Gaillot, Philippe, Hasegawa, Takashi, Hathorne, Edmund C., Hodell, David A., Kelly, Daniel C., Jung, Ja-Hun, Keller, Susan M., Lee, Youn Soo, Leuschner, Dirk C., Liu Zhifei, Lohmann, Kyger C., Lourens, Lucas, Monechi, Simonetta, Nicolo, Micah, Raffi, Isabella, Riesselman, Christina, Roehl, Ursula, Schellenberg, Stephen A., Schmidt, Daniela, Sluijs, Appy, Thomas, Deborah, Thomas, Ellen, Vallius, Henry, Proceedings of the Ocean Drilling Program; scientific results; early Cenozoic extreme climates; the Walvis Ridge Transect; covering Leg 208 of the cruises of the drilling vessel JOIDES Resolution; Rio de Janeiro, Brazil, to Rio de Janeiro, Brazil; Sites 1262-1267; 6 March-6 May 2003
Texas A&M University, Ocean Drilling Program, College Station, TX, United States
208
We report the paleomagnetic and rock magnetic results from discrete sample analysis of sediments from Walvis Ridge, Leg 208 of the Ocean Drilling Program. In an effort to refine the shipboard magnetostratigraphy, alternating field and thermal demagnetization of discrete samples were carried out, predominantly on samples from Sites 1262 and 1267. Results are generally consistent with the shipboard pass-through cryomagnetometer data, though in some cases the discrete samples resolved ambiguities in the reversal record. Significantly, the C24r/C24n reversal boundary was identified at Sites 1262 and 1267, and most boundaries in the Paleocene and Upper Cretaceous sections are now identified to within 10-30 cm. Magnetic mineralogy results show that prior to the late Miocene, the predominant detrital magnetic component was coarse-grained magnetite and that after the late Miocene, titanomagnetite has also been present. This suggests a possible change in detrital source at that time.
English
Coverage:Geographic coordinates:
North:-27.1100
West:1.3400East: 1.4300
South:-28.0600

Stratigraphy; Atlantic Ocean; boreholes; Cenozoic; cores; Cretaceous; Eocene; Leg 208; lower Eocene; magnetic inclination; magnetic minerals; magnetostratigraphy; marine sediments; Mesozoic; Ocean Drilling Program; ODP Site 1262; ODP Site 1267; Paleocene; Paleogene; paleolatitude; paleomagnetism; reversals; sediments; South Atlantic; Southeast Atlantic; stratigraphic boundary; Tertiary; Upper Cretaceous; Walvis Ridge;

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