Late Quaternary paleomagnetic secular variation and chronostratigraphy from ODP Sites 1233 and 1234

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doi: 10.2973/odp.proc.sr.202.208.2006
Author(s): Lund, Steven P.; Stoner, Joseph S.; Lamy, Frank
Ocean Drilling Program, Leg 202, Shipboard Scientific Party, College Station, TX
Author Affiliation(s): Primary:
University of Southern California, Department of Earth Sciences, Los Angeles, CA, United States
Other:
Oregon State University, United States
Texas A&M University, United States
Instituto Geologico e Mineiro, Portugal
University of Cambridge, United Kingdom
National Taiwan Ocean University, Taiwan
University of California at Santa Cruz, United States
Universidad Salamanca, Spain
Woods Hole Oceanographic Institution, United States
Hokkaido University, Japan
Kochi University, Japan
Hobart and William Smith Colleges, United States
University of Bergen, Norway
Universität Bremen, Federal Republic of Germany
University of Southern California, United States
Université de Bordeaux I, France
Columbia University, United States
Princeton University, United States
University of Colorado at Boulder, United States
Servicio Nacional de Geologia y Mineria, Bolivia
Volume Title: Proceedings of the Ocean Drilling Program; scientific results; Southeast Pacific paleoceanographic transects; covering Leg 202 of the cruises of the drilling vessel JOIDES Resolution; Valparaiso, Chile, to Balboa, Panama; Sites 1232-1242; 29 March-30 May 2002
Volume Author(s): Tiedemann, Ralf; Mix, Alan C.; Blum, Peter; Abrantes, Fatima F.; Benway, Heather; Cacho-Lascorz, Isabel; Chen, Min-Te; Delaney, Margaret L.; Flores, José-Abel; Giosan, Liviu; Holbourn, Ann E.; Irino, Tomohisa; Iwai, Masao; Joseph, Leah H.; Kleiven, Helga F.; Lamy, Frank; Lund, Steven P.; Martinez, Philippe; McManus, Jerry F.; Ninnemann, Ulysses S.; Pisias, Nicklas G.; Robinson, Rebecca S.; Stoner, Joseph S.; Sturm, Arne; Wara, Michael W.; Wei, Wuchang
Source: Proceedings of the Ocean Drilling Program; scientific results; Southeast Pacific paleoceanographic transects; covering Leg 202 of the cruises of the drilling vessel JOIDES Resolution; Valparaiso, Chile, to Balboa, Panama; Sites 1232-1242; 29 March-30 May 2002, Ralf Tiedemann, Alan C. Mix, Peter Blum, Fatima F. Abrantes, Heather Benway, Isabel Cacho-Lascorz, Min-Te Chen, Margaret L. Delaney, José-Abel Flores, Liviu Giosan, Ann E. Holbourn, Tomohisa Irino, Masao Iwai, Leah H. Joseph, Helga F. Kleiven, Frank Lamy, Steven P. Lund, Philippe Martinez, Jerry F. McManus, Ulysses S. Ninnemann, Nicklas G. Pisias, Rebecca S. Robinson, Joseph S. Stoner, Arne Sturm, Michael W. Wara and Wuchang Wei; Ocean Drilling Program, Leg 202, Shipboard Scientific Party, College Station, TX. Proceedings of the Ocean Drilling Program, Scientific Results (CD ROM), Vol.202, 22p. Publisher: Texas A&M University, Ocean Drilling Program, College Station, TX, United States. ISSN: 1096-2514
Note: In English. 21 refs.CD-ROM format, ISSN 1096-2514; WWW format, ISSN 1096-7451; illus.
Summary: During Ocean Drilling Program Leg 202, detailed shipboard paleomagnetic measurements at Sites 1233 and 1234 identified a reproducible high-resolution record of paleomagnetic secular variation (PSV) at each site. These records also contained evidence for three magnetic field excursions. This paper summarizes the complete paleomagnetic record from Site 1233 and the paleomagnetic record for the uppermost 30 meters from Site 1234. We also establish a detailed PSV correlation between the two sites, located ∼500 km apart. Twenty-seven accelerator mass spectrometry radiocarbon dates permit us to develop time-depth plots and detailed PSV time series for the last ∼50,000 yr at both sites. Based on our chronostratigraphy, the most recent excursions occur at ∼35,000 cal. yr before present (BP) (Excursion 3α) and ∼41,000 cal. yr BP (Excursion 3β). The excursions were named for the oxygen isotope stages within which they occur. These two excursions are not significantly different in age from the Mono Lake Excursion and Laschamp Excursion. A third, older excursion, which has not yet been adequately dated, also occurs at Site 1233.
Year of Publication: 2006
Research Program: ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Absolute age; Alternating field demagnetization; C-14; Carbon; Cenozoic; Chronostratigraphy; Cores; Correlation; Dates; Demagnetization; East Pacific; Isotopes; Leg 202; Magnetic excursions; Magnetic field; Magnetization; Magnetostratigraphy; Natural remanent magnetization; ODP Site 1233; ODP Site 1234; Ocean Drilling Program; Oxygen; Pacific Ocean; Paleomagnetism; Quaternary; Radioactive isotopes; Remanent magnetization; Secular variations; South Pacific; Southeast Pacific; Upper Quaternary
Coordinates: S361300 S361300 W0734100 W0734100
S410000 S410000 W0742700 W0742700
Record ID: 2007051085
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