Paleomagnetic measurements of igneous rocks from Shatsky Rise Expedition 324

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doi: 10.2204/iodp.proc.324.202.2013
Author(s): Pueringer, Margaret; Sager, William W.; Housen, Bernard
Integrated Ocean Drilling Program, Expedition 324 Scientists, College Station, TX
Author Affiliation(s): Primary:
Texas A&M University, Department of Geology and Geophysics, College Station, TX, United States
National Museum of Nature and Science, Japan
Lamont-Doherty Earth Observatory, United States
University of Hanover, Germany
Pusan National University, South Korea
Université Pierre et Marie Curie, France
Université Paul Sabatier, France
University of Hawaii at Manoa, United States
University of Rhode Island, United States
Eidgenössische Technische Hochschule Zürich, Switzerland
Leibniz Institute of Marine Sciences, Germany
Tohoku University, Japan
Japan Agency of Marine-Earth Science and Technology, Japan
Korea Institute of Geosciences and Mineral Resources, South Korea
Oregon State University, United States
Ocean University of China, China
University College London, United Kingdom
Ibaraki University, Japan
Kyoto University, Japan
Queensland University of Technology, Australia
University of Miami, United States
Doshisha University, Japan
University of Oxford, United Kingdom
Woods Hole Oceanographic Institution, United States
Open University, United Kingdom
Western Washington University, United States
Volume Title: Proceedings of the Integrated Ocean Drilling Program; Shatsky Rise Formation; Expedition 324 of the riserless drilling platform, Yokohama, Japan, to Townsville, Australia; Sites U1346-U1350, 4 September-3 November 2009
Volume Author(s): Sager, William W.; Sano, Takashi; Geldmacher, Jorg; Iturrino, Gerardo; Evans, Helen; Almeev, Renat; Ando, Atsushi; Carvallo, Claire; Delacour, Adélie; Greene, Andrew R.; Harris, Amber C.; Herrmann, Sandra; Heydolph, Ken; Hirano, Naoto; Ishikawa, Akira; Kang, Moo-Hee; Koppers, Anthony A. P.; Li Sanzhong; Littler, Kate; Mahoney, John; Matsubara, Noritaka; Miyoshi, Masaya; Murphy, David T.; Natland, James H.; Ooga, Masahiro; Prytulak, Julie; Shimizu, Kenji; Tominaga, Masako; Widdowson, Mike; Woodard, Stella C.
Source: Proceedings of the Integrated Ocean Drilling Program; Shatsky Rise Formation; Expedition 324 of the riserless drilling platform, Yokohama, Japan, to Townsville, Australia; Sites U1346-U1350, 4 September-3 November 2009, William W. Sager, Takashi Sano, Jorg Geldmacher, Gerardo Iturrino, Helen Evans, Renat Almeev, Atsushi Ando, Claire Carvallo, Adélie Delacour, Andrew R. Greene, Amber C. Harris, Sandra Herrmann, Ken Heydolph, Naoto Hirano, Akira Ishikawa, Moo-Hee Kang, Anthony A. P. Koppers, Li Sanzhong, Kate Littler, John Mahoney, Noritaka Matsubara, Masaya Miyoshi, David T. Murphy, James H. Natland, Masahiro Ooga, Julie Prytulak, Kenji Shimizu, Masako Tominaga, Mike Widdowson and Stella C. Woodard; Integrated Ocean Drilling Program, Expedition 324 Scientists, College Station, TX. Proceedings of the Integrated Ocean Drilling Program (Online), Vol.324, 33p. Publisher: IODP Management International, Washington, DC, United States. ISSN: 1930-1014
Note: In English. 14 refs.; illus., incl. 7 tables, sketch map
Summary: Five sites were cored on Shatsky Rise, an oceanic plateau, during Integrated Ocean Drilling Program Expedition 324 to gain a better understanding of its formation processes. To augment and improve the shipboard paleomagnetic results, an additional 135 samples from Sites U1346-U1348 and U1350 were measured at the Northwest Paleomagnetism Laboratory at Western Washington University (USA). Samples from all sites were demagnetized using either alternating field (AF) or thermal demagnetization in approximately equal numbers. Most samples display a downward- directed overprint likely caused by the drill string magnetic field. This overprint was typically removed by ∼10-15 mT AF demagnetization or ∼300°C thermal demagnetization. AF demagnetization generally worked well to isolate a characteristic remanence direction, with samples mostly showing low (<10 mT) to moderate (10-20 mT) median destructive field values. Thermal demagnetiation was also mostly successful in isolating a characteristic remanence at temperatures >350°-400°C. Some samples showed small sections of self-reversal during thermal demagnetization. Changes in inclination over depth showed little variation at Sites U1346 and U1347, but more variation was recorded at Site U1350. Hysteresis analysis showed that samples from all sites reside in the single-domain to pseudosingle domain region of the Day plot.
Year of Publication: 2013
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 05 Petrology, Igneous and Metamorphic; 18 Geophysics, Solid-Earth; Basalts; Boreholes; Cores; Crust; Expedition 324; Hysteresis; IODP Site U1346; IODP Site U1347; IODP Site U1348; IODP Site U1349; IODP Site U1350; Igneous rocks; Integrated Ocean Drilling Program; Large igneous provinces; Magnetic inclination; North Pacific; Northwest Pacific; Oceanic crust; Pacific Ocean; Paleomagnetism; Principal components analysis; Shatsky Rise; Statistical analysis; Volcanic rocks; Volcaniclastics; West Pacific
Coordinates: N380024 N380024 E1623843 E1623843
N323029 N323029 E1591405 E1591405
N342456 N342456 E1592254 E1592254
N360657 N360657 E1582730 E1582730
N360429 N360429 E1591704 E1591704
Record ID: 2013070777
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