Proc. IODP, 339, Data report: IODP Site U1387: the revised splice between Sections U1387B-18X-3 and U1387C-8R-3 (>171.6 mcd)

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Chapter contents Abstract Introduction Materials and methods Results Acknowledgments References Figures F1. Site location. F2. Revised splice vs. corrected mcd. F3. Benthic δ18O and δ13C records. F4. Sand fraction and δ18O records. Tables T1. Revised splice. T2. Sample depth offsets. PDF file			Previous \| Next doi:10.2204/iodp.proc.339.204.2018 Data report: IODP Site U1387: the revised splice between Sections U1387B-18X-3 and U1387C-8R-3 (>171.6 mcd)¹ Antje H.L. Voelker,^{2, 3} Francisco J. Jimenez-Espejo,^{4, 5} André Bahr,⁶ Andreia Rebotim,^{2, 3, 7} Catarina Cavaleiro,^{2, 3, 7} Emília Salgueiro,^{2, 3} and Ursula Röhl⁷ Abstract The Expedition 339 shipboard splice of Integrated Ocean Drilling Program (IODP) Site U1387 deeper than ~155 meters composite depth (mcd) is based on a composite of the magnetic susceptibility and natural gamma radiation data. When generating high-resolution paleoceanographic reconstructions for the Mid-Pleistocene Transition and early Pleistocene sections of Site U1387, it quickly became obvious that proxy data misfits existed at several splice transitions. Thus, a revised splice was generated for Site U1387 below Core 339-U1387B-18X based on X-ray fluorescence–derived element records (e.g., ln[Fe/Ca]) and the stable isotope records obtained for planktonic and benthic foraminifers. Corrections were needed at most of the splice transitions below Core 339-U1387A-19X, with adjustments ranging from a few centimeters to several meters. In addition, Core 339-U1387A-33X and sections of Core 36X were integrated into the revised splice to replace Core 339-U1387C-2R and sections of Core 5R, respectively. The replacement of Core 339-U1387C-2R with Core 339-U1387A-33X is an option for the intended paleoceanographic research and not essential for lower resolution studies. The splice tie point table, therefore, also includes an option for a splice that retains Core 339-U1387C-2R. The extensive revision of the shipboard splice reveals that making a splice for sediment sequences rich in contourite layers and coring disturbances (biscuiting in the extended core barrel cores) can be tricky and that data misfits at splice transitions are not necessarily a data problem but could indicate a splice problem. ¹ Voelker, A.H.L., Jimenez-Espejo, F.J., Bahr, A., Rebotim, A., Cavaleiro, C., Salgueiro, E., and Röhl, U., 2018. Data report: IODP Site U1387: the revised splice between Sections U1387B-18X-3 and U1387C-8R-3 (>171.6 mcd). In Stow, D.A.V., Hernández-Molina, F.J., Alvarez Zarikian, C.A., and the Expedition 339 Scientists, Proceedings of the Integrated Ocean Drilling Program, 339: Tokyo (Integrated Ocean Drilling Program Management International, Inc.). doi:10.2204/iodp.proc.339.204.2018 ² Divisão de Geologia e Georecursos Marinhos, Instituto Português do Mar e da Atmosfera (IPMA), Rua Alfredo Magalhães Ramalho 6, 1495-006 Lisboa, Portugal. Correspondence author: antje.voelker@ipma.pt ³ Also at CCMAR, Centro de Ciencias do Mar, Universidade do Algarve, Campus de Gambelas, 8005-139, Faro, Portugal. ⁴ Department of Biogeochemistry, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka 237-0061, Japan. ⁵ Also at Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR), Avenida de las Palmeras 4, 18071 Amilla, Spain. ⁶ Sedimentology and Marine Paleoenvironmental Dynamics, Institute of Earth Sciences, Heidelberg University, 69120 Heidelberg, Germany. ⁷ Also at MARUM, Center for Marine Environmental Sciences, Universität Bremen, Leobener Strasse, 28355 Bremen, Germany. Initial receipt: 16 April 2018 Acceptance: 6 August 2018 Publication: 19 October 2018 MS 339-204 Top of page \| Previous \| Next