Data report; revised magnetostratigraphy and magnetic mineralogy of sediments from Walvis Ridge, Leg 208

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doi: 10.2973/odp.proc.sr.208.206.2006
Author(s): Bowles, Julie
Ocean Drilling Program, Leg 208, Shipboard Scientific Party, College Station, TX
Author Affiliation(s): Primary:
Scripps Institution of Oceanography, La Jolla, CA, United States
Other:
University of California, Santa Cruz, United States
Ocean Drilling Program, United States
Scripps Institution of Oceanography, United States
Université de Montpellier II, France
Kanazawa University, Japan
Open University, United Kingdom
University of Florida, United States
University of Wisconsin-Madison, United States
Pukyong National University, South Korea
Korea Institute of Geoscience and Mineral Resources, South Korea
Universität Leipzig, Federal Republic of Germany
Tongji University, China
University of Michigan, United States
Utrecht University, Netherlands
Universita di Firenze, Italy
Rice University, United States
Universitariá "G. D'Annunzio", Italy
Stanford University, United States
Universität Bremen, Federal Republic of Germany
San Diego State University, United States
Royal Holloway University of London, United Kingdom
University of North Carolina at Chapel Hill, United States
Wesleyan University, United States
Geological Survey of Finland, Finland
Volume Title: 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
Volume Author(s): 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; Röhl, Ursula; Schellenberg, Stephen A.; Schmidt, Daniela; Sluijs, Appy; Thomas, Deborah; Thomas, Ellen; Vallius, Henry
Source: 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, Dick Kroon, James C. Zachos, Peter Blum, Julie Bowles, Philippe Gaillot, Takashi Hasegawa, Edmund C. Hathorne, David A. Hodell, Daniel C. Kelly, Ja-Hun Jung, Susan M. Keller, Youn Soo Lee, Dirk C. Leuschner, Liu Zhifei, Kyger C. Lohmann, Lucas Lourens, Simonetta Monechi, Micah Nicolo, Isabella Raffi, Christina Riesselman, Ursula Röhl, Stephen A. Schellenberg, Daniela Schmidt, Appy Sluijs, Deborah Thomas, Ellen Thomas and Henry Vallius; Ocean Drilling Program, Leg 208, Shipboard Scientific Party, College Station, TX. Proceedings of the Ocean Drilling Program, Scientific Results (CD ROM), Vol.208, 24p. Publisher: Texas A&M University, Ocean Drilling Program, College Station, TX, United States. ISSN: 1096-2514
Note: In English. Includes appendices. 17 refs.CD-ROM format, ISSN 1096-2514; WWW format, ISSN 1096-7451; illus., incl. 6 tables, sketch map
Summary: 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.
Year of Publication: 2007
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Atlantic Ocean; Boreholes; Cenozoic; Cores; Cretaceous; Eocene; Leg 208; Lower Eocene; Magnetic inclination; Magnetic minerals; Magnetostratigraphy; Marine sediments; Mesozoic; ODP Site 1262; ODP Site 1267; Ocean Drilling Program; Paleocene; Paleogene; Paleolatitude; Paleomagnetism; Reversals; Sediments; South Atlantic; Southeast Atlantic; Stratigraphic boundary; Tertiary; Upper Cretaceous; Walvis Ridge
Coordinates: S271100 S271100 E0013500 E0013400
S280600 S280600 E0014300 E0014200
Record ID: 2007087739
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