Data report; Dissolved rare earth elements (REEs) in the pore fluids of sites U1378, U1380, U1381, and U1414 drilled during IODP Expeditions 334 and 344

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doi: 10.2204/iodp.proc.344.209.2018
Author(s): Yang, Jon; Kim, Ji-Hoon; Torres, Marta E.; Haley, Brian
Integrated Ocean Drilling Program, Expedition 344 Scientists, College Station, TX
Author Affiliation(s): Primary:
Oregon State University, College of Earth, Ocean, and Atmospheric Science, Corvallis, OR, United States
Other:
Korea Institute of Geosciences and Mineral Resources, South Korea
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; Malinverno, Alberto; Baxter, Alan T.; Berg, Richard; Burkett, Ashley; Charpentier, Delphine; Choi, Jiyoung; Ferreiro, Paula Diz; Hamahashi, Mari; Hashimoto, Yoshitaka; Heydolph, Ken; Jovane, Luigi; Kastner, Miriam; Kurz, Walter; Kutterolf, Steffen O.; Li Yongxiang; Martin, Kylara M.; Millan, Cristina; Nascimento, Debora 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 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, Debora 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, 17p. Publisher: International Ocean Discovery Program, Washington, DC, United States. ISSN: 1930-1014 CODEN: IDSDA6
Note: In English. Includes appendices. 37 refs.; illus., incl. sect., 4 tables, sketch map
Summary: In this report, we present the concentrations of dissolved rare earth elements (REEs) in pore fluids recovered during International Ocean Discovery Program (IODP) Expeditions 334 and 344 from the active margin of Costa Rica. We measured dissolved REEs at three sites on the Costa Rica margin: Sites U1378/U1380 on middle slope of the continental margin and Sites U1381 and U1414 on the incoming Cocos plate. Pore fluids recovered from these cores were filtered and acidified after sampling and stored until the dissolved REEs could be measured directly using an automated chromatography preconcentration system attached to an inductively coupled plasma-mass spectrometer at Oregon State University. At Sites U1378/U1380 on the continental slope, the measured REE concentrations in the pore fluid were variable in the upper 200 meters below seafloor (mbsf), ranging from 9 to 162 pM, 24 to 120 pM, and 29 to 145 pM for La, Dy, and Yb, respectively, representing the light, middle, and heavy REEs. Deeper than 200 mbsf at Sites U1378/U1380, measured concentrations decreased from 100 to 17 pM, 10 to 4 pM, and 50 to 10 pM for La, Dy, and Yb. At Site U1381 on the incoming Cocos plate, measured concentrations peaked at 192 (La), 43 (Dy), and 74 pM (Yb) at 20 mbsf. Deeper than 80 mbsf, measured concentrations increase, particularly for the light and middle REEs, with averages of 273 (La), 38 (Dy), and 26 pM (Yb). At the second site on the incoming plate, Site U1414, measured REE concentrations peak in the upper 75 mbsf and return to relatively constant values deeper than 75 mbsf. Peak concentrations of 834 (La), 223 (Dy), and 207 pM (Yb) are followed by average concentrations of ∼25 (La), ∼10 (Dy), and ∼20 pM (Yb) deeper than 75 mbsf. Dissolved REE concentrations in the pore fluids were normalized to Post-Archean Australian Shale (PAAS) to evaluate relative abundances of light, middle, and heavy REEs. For all three sites, normalized concentrations show a greater abundance of heavy REEs relative to light and middle REEs. The trend for this greater relative abundance of heavy REEs is greatest for the upper portion of the sediment and becomes less pronounced downcore.
Year of Publication: 2018
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 02 Geochemistry; 07 Marine Geology and Oceanography; Alkaline earth metals; Alkalinity; Ammonium ion; Barium; Boreholes; Central America; Concentration; Continental margin; Cores; Costa Rica; Costa Rica Seismogenesis Project; East Pacific; Expedition 334; Expedition 344; Geochemistry; Hydrochemistry; IODP Site U1378; IODP Site U1380; IODP Site U1381; IODP Site U1414; Integrated Ocean Drilling Program; Marine sediments; Metals; North Pacific; Northeast Pacific; Pacific Ocean; Pore water; Rare earths; Sediments; Solutes
Coordinates: N083532 N083532 W0840438 W0840438
N083600 N083600 W0840424 W0840424
N082543 N082543 W0840928 W0840929
N083014 N083014 W0841332 W0841332
Record ID: 2018096746
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.