TY - JOUR

T1 - Trace element and Sr isotopic composition of bottom and near-surface oceanic water in the southern region of the Emperor Ridge

AU - Vishnevskaya, I. A.

AU - Okuneva, T. G.

AU - Kiseleva, D. V.

AU - Soloshenko, N. G.

AU - Streletskaya, M. V.

AU - Vosel, Yu S.

N1 - Publisher Copyright: © 2020 Elsevier B.V. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/8/20

Y1 - 2020/8/20

N2 - During the 86th voyage of the research vessel “Akademik M.A. Lavrentiev” (July–August 2019), near-bottom and near-surface water samples (at a depth of 10 m) were taken in the immediate vicinity and above the Koko, Jingu, Nintoku, and Suiko seamounts in the southern part of the Emperor seamount chain. Trace element concentrations (including REE) in these samples are higher than in the IAPSO Standard Atlantic Seawater. The distribution and mutual correlations of elements involved in biochemical processes indicate an active role of plankton in the accumulation of these elements, as well as an increase in its amount with increasing water temperature. 87Sr/86Sr ratios in water samples vary from 0.70891 to 0.70917. Moreover, near-bottom water, taken farther south of 44°N, is more radiogenic than near-surface. This difference can be explained by the dilution of the surface layer with meteoric water, because at the time of sample collection over the Koko, Jingu, and Nintoku seamounts it was raining daily, while no rainfall was observed over the Suiko seamount during the sample collection and the week before it. The rapid restoration of isotopic equilibrium indicates a high rate of vertical mixing of ocean water, which was indicated by the earlier studies of oceanic water chemical composition.

AB - During the 86th voyage of the research vessel “Akademik M.A. Lavrentiev” (July–August 2019), near-bottom and near-surface water samples (at a depth of 10 m) were taken in the immediate vicinity and above the Koko, Jingu, Nintoku, and Suiko seamounts in the southern part of the Emperor seamount chain. Trace element concentrations (including REE) in these samples are higher than in the IAPSO Standard Atlantic Seawater. The distribution and mutual correlations of elements involved in biochemical processes indicate an active role of plankton in the accumulation of these elements, as well as an increase in its amount with increasing water temperature. 87Sr/86Sr ratios in water samples vary from 0.70891 to 0.70917. Moreover, near-bottom water, taken farther south of 44°N, is more radiogenic than near-surface. This difference can be explained by the dilution of the surface layer with meteoric water, because at the time of sample collection over the Koko, Jingu, and Nintoku seamounts it was raining daily, while no rainfall was observed over the Suiko seamount during the sample collection and the week before it. The rapid restoration of isotopic equilibrium indicates a high rate of vertical mixing of ocean water, which was indicated by the earlier studies of oceanic water chemical composition.

KW - Sr/Sr ratio

KW - Emperor chain

KW - Hawaiian Emperor bend

KW - North Pacific Ocean

KW - Ocean water composition

KW - Vertical mixing

KW - PROFILES

KW - PARTICLES

KW - PACIFIC

KW - ATLANTIC

KW - NEODYMIUM ISOTOPES

KW - STRATIGRAPHY

KW - SEA

KW - STRONTIUM

KW - Sr-87/Sr-86 ratio

KW - RARE-EARTH-ELEMENTS

KW - PROVENANCE

UR - http://www.scopus.com/inward/record.url?scp=85083512614&partnerID=8YFLogxK

U2 - 10.1016/j.marchem.2020.103808

DO - 10.1016/j.marchem.2020.103808

M3 - Article

AN - SCOPUS:85083512614

VL - 224

JO - Marine Chemistry

JF - Marine Chemistry

SN - 0304-4203

M1 - 103808

ER -