Data report; Magnetic properties of sediments and basalts from the Costa Rica subduction margin (Expeditions 334 and 344)

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doi: 10.2204/iodp.proc.344.206.2015
Author(s): Petronotis, Katerina E.; Acton, Gary D.; Jovane, Luigi; Li Yongxiang; Zhao, Xixi
Integrated Ocean Drilling Program, Expedition 344 Scientists, College Station, TX
Author Affiliation(s): Primary:
Texas A&M University, College Station, TX, United States
Japan Agency for Marine-Earth Science and Technology, Japan
Integrated Ocean Drilling Program, United States
Lamont-Doherty Earth Observatory, United States
University of New England, Australia
University of Washington, United States
Indiana State University, United States
Université de Franche-Comté, France
Korea Institute of Geoscience and Mineral Resources, South Korea
University of Vigo, Spain
University of Tokyo, Japan
Kochi University, Japan
Helmholtz Centre for Ocean Research Kiel, Germany
Universidade de Sao Paulo, Brazil
Scripps Institution of Oceanography, United States
University of Graz, Austria
Nanjing University, China
Naval Research Laboratory, United States
Ohio State University, United States
Universidade Federal do Rio de Janeiro, Brazil
Université de Lausanne, Switzerland
University of Florida, United States
University of Southampton, United Kingdom
Kumamoto University, Japan
Royal Holloway-University of London, United Kingdom
State Oceanic Administration, China
University of California-Santa Cruz, United States
Sam Houston State University, United States
Nanjing University, United States
Volume Title: Proceedings of the Integrated Ocean Drilling Program; Costa Rica Seismogenesis Project, Program A, Stage 2 (CRISP-A2); Expedition 344 of the riserless drilling platform, Balboa, Panama, to Puntarenas, Costa Rica; Sites U1380, U1381, and U1412-U1414, 23 October-11 December 2012
Volume Author(s): Harris, Robert N.; Sakaguchi, Arito; Petronotis, Katerina E.; Malinverno, Alberto; Baxter, Alan T.; Berg, Richard; Burkett, Ashley; Charpentier, Delphine; Choi, Jiyoung; Diz Ferreiro, Paula; Hamahashi, Mari; Hashimoto, Yoshitaka; Heydolph, Ken; Jovane, Luigi; Kastner, Miriam; Kurz, Walter; Kutterolf, Steffen O.; Li Yongxiang; Martin, Kylara M.; Millan, Cristina; Nascimento, Débora B.; Saito, Saneatsu; Sandoval Gutierrez, Maria I.; Screaton, Elizabeth J.; Smith-Duque, Christopher E.; Solomon, Evan A.; Straub, Susanne M.; Tanikawa, Wataru; Torres, Marta E.; Uchimura, Hitomi; Vannucchi, Paola; Yamamoto, Yuzuru; Yan Quanshu; Zhao, Xixi
Source: Proceedings of the Integrated Ocean Drilling Program; Costa Rica Seismogenesis Project, Program A, Stage 2 (CRISP-A2); Expedition 344 of the riserless drilling platform, Balboa, Panama, to Puntarenas, Costa Rica; Sites U1380, U1381, and U1412-U1414, 23 October-11 December 2012, Robert N. Harris, Arito Sakaguchi, Katerina E. Petronotis, Alberto Malinverno, Alan T. Baxter, Richard Berg, Ashley Burkett, Delphine Charpentier, Jiyoung Choi, Paula Diz Ferreiro, Mari Hamahashi, Yoshitaka Hashimoto, Ken Heydolph, Luigi Jovane, Miriam Kastner, Walter Kurz, Steffen O. Kutterolf, Li Yongxiang, Kylara M. Martin, Cristina Millan, Débora B. Nascimento, Saneatsu Saito, Maria I. Sandoval Gutierrez, Elizabeth J. Screaton, Christopher E. Smith-Duque, Evan A. Solomon, Susanne M. Straub, Wataru Tanikawa, Marta E. Torres, Hitomi Uchimura, Paola Vannucchi, Yuzuru Yamamoto, Yan Quanshu and Xixi Zhao; Integrated Ocean Drilling Program, Expedition 344 Scientists, College Station, TX. Proceedings of the Integrated Ocean Drilling Program, Vol.344, 16p. Publisher: International Ocean Discovery Program, Washington, DC, United States. ISSN: 1930-1014 CODEN: IDSDA6
Note: In English. 18 refs.; illus., incl. 4 tables, sketch map
Summary: We measured the rock magnetic properties of 24 basalt, sediment, and tephra samples from Costa Rica Sites U1380, U1381, U1413, and U1414. Day plots indicate that most samples are dominated by populations of pseudosingle-domain (PSD) magnetic minerals, with significant contributions of single-domain (SD) grains in the tephra samples and multidomain (MD) grains in the basalts and coarser grained sediments. Coercivity distributions from first-order reversal curves (FORCs) from basalt samples generally peak at about 2-5 mT, rarely extend beyond 20 mT, and show interactions consistent with the presence of PSD and lesser amounts of MD particles. Distributions are consistent with titanomagnetite and/or titanomaghemite being the primary magnetic minerals, as is typical for oceanic basalts. FORCs for the tephras have broad coercivity distributions with peaks near 40-70 mT and with much less interaction than the basalts. The narrow interaction width reflects lower magnetic concentrations than the basalts, whereas the higher coercivity is consistent with the presence of significant SD magnetite, with possibly small amounts of iron sulfides. Coercivity distributions for sediments are typical of marine sediments with mixtures of mainly PSD and SD particles. These distributions have peaks between about 10 and 50 mT, with interactions that are dependent on magnetic concentrations. Demagnetization experiments of basalt samples show that, after the removal of a low-coercivity drilling overprint, the basalts have a primary magnetization component with relatively shallow inclination (∼20°), consistent with the tectonic history of the Cocos plate. Basalt samples from the top and flank of the Cocos Ridge have slightly different rock magnetic properties, possibly indicating varying components of hotspot volcanism and seafloor spreading.
Year of Publication: 2015
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 05 Petrology, Igneous and Metamorphic; 18 Geophysics, Solid-Earth; Basalts; Cocos Plate; Costa Rica Seismogenesis Project; East Pacific; Expedition 344; Hysteresis; IODP Site U1380; IODP Site U1381; IODP Site U1413; IODP Site U1414; Igneous rocks; Integrated Ocean Drilling Program; Magnetic minerals; Magnetic properties; Magnetization; Marine sediments; Natural remanent magnetization; North Pacific; Northeast Pacific; Pacific Ocean; Paleomagnetism; Pyroclastics; Remanent magnetization; Sediments; Volcanic rocks
Coordinates: N083600 N083600 W0840424 W0840424
N082543 N082543 W0840928 W0840929
N084427 N084428 W0840648 W0840649
N083014 N083014 W0841332 W0841332
Record ID: 2015121601
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