Nitrogen isotope homogenization of dissolved ammonium with depth and 15N enrichment of ammonium during incorporation into expandable layer silicates in organic-rich marine sediment from Guaymas Basin, Gulf of California
Por:
Yamanaka T., Sakamoto A., Kiyokawa K., Jo J., Onishi Y., Kuwahara Y., Kim J.-H., Pastor L.C., Teske A., Lizarralde D., Höfig T.W., Aiello I.W., Ash J.L., Bojanova D.P., Buatier M.D., Edgcomb V.P., Galerne C.Y., Gontharet S., Heuer V.B., Jiang S., Kars M.A.C., Koornneef L.M.T., Marsaglia K.M., Meyer N.R., Morono Y., Negrete-Aranda R., Neumann F., Peña-Salinas M.E., Pérez-Cruz L.L., Ran L., Riboulleau A., Sarao J.A., Schubert F., Singh S.K., Stock J.M., Toffin L., Xie W., Zhuang G.
Publicada:
1 ene 2024
Resumen:
Sedimentary nitrogen isotopic ratios are used as a proxy for ancient biogeochemical cycles on Earth's surface. It is generally accepted that sediment hole tops record primary signatures because organic nitrogen (ON) is predominant in this part of the hole. In contrast to such early to middle diagenetic stages, it is well known that heavier nitrogen isotope 15N tends to enrich in sedimentary rocks during later diagenetic and metamorphic stages. However, there are some critical gaps in our understanding of nitrogen isotopic alteration associated with abiotic processes during early-middle diagenesis. In this study, we examined the isotope ratios of ammonium nitrogen in interstitial water (IW) and total nitrogen (TN), including exchangeable ammonium and mineral nitrogen, in the solid-phase of organic-rich-sediment recovered by International Ocean Discovery Program (IODP) Expedition 385 cores drilled in the Guaymas Basin, Gulf of California, that contained ammonium-rich IW. The isotopic ratios (d15N value) of TN are the most variable with depth compared to any other type of nitrogen. This variation can be interpreted as reflecting changes in the water mass environment in the basin caused by glacial–interglacial climate changes, modifying the d15N values of the marine primary producers. Thus, the d15N value of TN is a proxy for environmental change in the basin, while each component of TN shows different trends. The d15N values of IW and exchangeable ammonium did not exhibit significant changes with depth, but the latter values are about 3 ‰ enriched in 15N. This may be due to advective transport of solute into adjacent layers followed by the formation of an isotopic equilibrium between IW and exchangeable ammonium in the case of fast sediment accumulation rate. The d15N value of exchangeable ammonium is the highest among the other types of nitrogen with one exception, where the d15N value of TN is the highest. The calculated d15N values of ON based on mass balance are almost the same as those of associated TN in the shallow sediment layers (< 150 m below seafloor), but the difference in the d15N values of TN and ON are significant in the deeper layers, where proportions of ON contents are <50%. In particular, in the layer where the d15N value of TN is the highest, that of ON shows an even higher value and the difference reaches 3.5 ‰. The d15N values of mineral nitrogen are similar to that of IW ammonium except the surface layers. Under such conditions, when d15N value of TN is intermediate between those of mineral nitrogen and exchangeable ammonium, calculated d15N value of ON is close to that of TN. On the other hand, if d15N value of TN is out of the range between mineral nitrogen and exchangeable ammonium, it causes further difference in d15N value of ON. It means that the fluctuation of d15N values of TN is reduced relative to those of ON through depth. It has been considered that d15N value of TN in sediment is similar to that of ON, and changes in the d15N value of TN due to diagenesis are limited, but in such environment ON fluctuations over depth may be slightly underestimated. © 2024 The Authors
Filiaciones:
Yamanaka T.:
School of Marine Resources and Environment, Tokyo University of Marine Science and Technology, 4-5-7 Konann, Minato-ku, Tokyo, 108-8477, Japan
Sakamoto A.:
School of Marine Resources and Environment, Tokyo University of Marine Science and Technology, 4-5-7 Konann, Minato-ku, Tokyo, 108-8477, Japan
Kiyokawa K.:
School of Marine Resources and Environment, Tokyo University of Marine Science and Technology, 4-5-7 Konann, Minato-ku, Tokyo, 108-8477, Japan
Jo J.:
Department of Geoenvironmental Sciences, Kongju National University, Gongju, 32588, South Korea
Onishi Y.:
Research Institute for Humanity and Nature, 457-4 Motoyama, Kamigamo, Kita-ku, Kyoto, 603-8047, Japan
Kuwahara Y.:
Division of Environmental Changes, Faculty of Social and Cultural Studies, Kyushu University, 744 Motooka, Fukuoka, 819-0395, Japan
Kim J.-H.:
Petroleum and Marine Research Division, Korea Institute of Geoscience & Mineral Resources, Daejeon, 305-350, South Korea
Pastor L.C.:
IFREMER, Centre de Brest, Plouzané, 29280, France
Teske A.:
Department of Marine Sciences, University of North Carolina at Chapel Hill, Chapel Hill, 27599, NC, United States
Lizarralde D.:
Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, 02543, MA, United States
Höfig T.W.:
International Ocean Discovery Program, Texas A&M University, College Station, 77845, TX, United States
Aiello I.W.:
San Jose State University, Moss Landing Marine Laboratories, Moss Landing, 95039, CA, United States
Ash J.L.:
Department of Earth, Environmental and Planetary Sciences, Rice University, Houston, 77005, TX, United States
Bojanova D.P.:
Department of Earth Sciences, University of Southern California, Los Angeles, 90089, CA, United States
Buatier M.D.:
Chrono-Environnement, UMR 6249-CNRS, Université Bourgogne Franche-Comté, Besançon, 25030, France
Edgcomb V.P.:
Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, 02543, MA, United States
Galerne C.Y.:
Faculty of Geosciences, University of Bremen, Bremen, 28359, Germany
Gontharet S.:
LOCEAN UMR 7159 Sorbonne Université/CNRS/IRD/MNHN, 4 place Jussieu – boite 100, Paris, F-75252, France
Heuer V.B.:
MARUM – Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany
Jiang S.:
College of Oceanography, Hohai University, Nanjing, China
Kars M.A.C.:
International Ocean Discovery Program, Texas A&M University, College Station, 77845, TX, United States
Koornneef L.M.T.:
Earth and Environmental Sciences, School of Geography, University of Plymouth, Devon, Plymouth, PL4 8AA, United Kingdom
Marsaglia K.M.:
Department of Geological Sciences, California State University, Northridge, 91330-8266, CA, United States
Meyer N.R.:
Department of Earth System Science, Stanford University, Stanford, 94305, CA, United States
Morono Y.:
Kochi Institute for Core Sample Research, Institute for Extra-cutting-edge Science and Technology Avant-garde Research (X-star), Japan Agency for Marine-Earth Science and Technology, Kochi, Nankoku, 783-8502, Japan
Negrete-Aranda R.:
Investigador por Mexico, Department of Geology, CICESE, BC, Ensenada, 22860, Mexico
Neumann F.:
GFZ, German Research Centre for Geosciences, Section 4.8 Geoenergy, Telegrafenberg, Potsdam, 14473, Germany
Peña-Salinas M.E.:
Department of Coastal Oceanography, UABC, Zona Playitas, BC, Ensenada, 22860, Mexico
Pérez-Cruz L.L.:
Institute of Geophysics, Universidad Nacional Autónoma de México (UNAM), Mexico City, 04510, Mexico
Ran L.:
Key Laboratory of Marine Ecosystem Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Zhejiang, Hangzhou, China
Riboulleau A.:
Laboratoire d'Océanologie et de Géosciences, UMR 8187, Université de Lille, CNRS, Villeneuve d'Ascq, 59655, France
Sarao J.A.:
Department of Geology & Geophysics, Texas A&M University, College Station, 77843, TX, United States
Schubert F.:
Section Geomicrobiology, GFZ German Research Centre for Geosciences, Section Geomicrobiology, Telegrafenberg, Potsdam, 14473, Germany
Singh S.K.:
Department of Geological Oceanography, CSIR – National Institute of Oceanography, Goa, 403004, India
Stock J.M.:
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, 91125, CA, United States
Toffin L.:
IFREMER, Centre de Brest, Plouzané, 29280, France
Xie W.:
Key Laboratory of Marine Hazards Forecasting, College of Oceanography, Hohai University, Nanjing, 210024, China
Zhuang G.:
Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, China
All Open Access; Hybrid Gold Open Access
|