TY - JOUR

T1 - Distribution of rare earth elements and yttrium in water, suspended matter and bottom sediments in Lake Onego: Evidence of the watershed transformation in the Late Pleistocene

AU - Strakhovenko, Vera

AU - Belkina, Natalia

AU - Subetto, Dmitry

AU - Rybalko, Alexander

AU - Efremenko, Natalia

AU - Kulik, Natalia

AU - Potakhin, Maxim

AU - Zobkov, Mikhail

AU - Ovdina, Ekaterina

AU - Ludikova, Anna

N1 - Funding Information: The study was done with financial support from Russian Foundation for Basic Research (RFBR, No. 19-05-50014 ), the Russian Science Foundation (RSF, No. 18-17-00176 ) and by the Ministry of Education of the Russian Federation, as part of a state task (No. FSZN-2020-0016 - sampling (expedition on the RV « Ekolog») and development of equipment and methods for the collection of suspended matter were carried out according to the state order « Study of the modern sedimentation regime of lakes in Karelia» of the Karelian Research Center of the Russian Academy of Sciences (NWPI KRC RAS). Publisher Copyright: © 2021 Elsevier Ltd and INQUA Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2021/7/21

Y1 - 2021/7/21

N2 - Data on the mineralogy and geochemistry of rare earth elements (REE + Y) in water, suspended matter and stratified sediment cores from different parts of Lake Onego are presented. The study finds that the dissolved REE + Y in the water from different areas of Lake Onego have common features: (1) a maximum in the area of middle rare earth elements (MREE), (2) a distinct negative Ce anomaly and (3) a positive Eu anomaly. Comparison of the average concentration of elements in the stratified core of the bottom sediments and particulate matter (from the filters and sedimentation traps) from different parts of Lake Onego and the distribution of REE + Y do not reveal any significant differences. The trend of the REE + Y distribution for samples from the South Onego completely coincide the REE + Y distribution in siltstones and sandstones of the Russian Platform Scale Composite (RPSC). In the water area of Lake Onego from south to north, a well-defined trend of changes in REE + Y patterns relative to the RPSC is revealed, with depletion by heavy REE + Y and gradual enrichment by light rare earth elements (LREE). Geochemical and mineralogical data confirm our hypothesis of a significant reformatting of the catchment basin of the Onego Ice Lake in the Late Pleistocene. During the formation of the preglacial lake, a significant part of the catchment area was located south of Lake Onego and is mainly represented by Russian Platform sedimentary rocks. Due to the degradation of the Last Glacier from the Lake Onego depression and the nearby territories, the catchment area changed of its southern and south-eastern sections. Today the composition of the modern sedimentary matter entering Lake Onego is determined by mixing clusters from two geochemically contrasting feeding areas: loose sediments formed by the repeatedly re-deposited products of the weathering of the Fennoscandian Shield's crystalline rock massifs, including Phanerozoic sediments; and to a lesser extent the sediments of the sedimentary cover of the Russian Platform, except the bottom sediments of the South Onego, in which Phanerozoic sedimentary formations have completely predominated throughout the lake's development.

AB - Data on the mineralogy and geochemistry of rare earth elements (REE + Y) in water, suspended matter and stratified sediment cores from different parts of Lake Onego are presented. The study finds that the dissolved REE + Y in the water from different areas of Lake Onego have common features: (1) a maximum in the area of middle rare earth elements (MREE), (2) a distinct negative Ce anomaly and (3) a positive Eu anomaly. Comparison of the average concentration of elements in the stratified core of the bottom sediments and particulate matter (from the filters and sedimentation traps) from different parts of Lake Onego and the distribution of REE + Y do not reveal any significant differences. The trend of the REE + Y distribution for samples from the South Onego completely coincide the REE + Y distribution in siltstones and sandstones of the Russian Platform Scale Composite (RPSC). In the water area of Lake Onego from south to north, a well-defined trend of changes in REE + Y patterns relative to the RPSC is revealed, with depletion by heavy REE + Y and gradual enrichment by light rare earth elements (LREE). Geochemical and mineralogical data confirm our hypothesis of a significant reformatting of the catchment basin of the Onego Ice Lake in the Late Pleistocene. During the formation of the preglacial lake, a significant part of the catchment area was located south of Lake Onego and is mainly represented by Russian Platform sedimentary rocks. Due to the degradation of the Last Glacier from the Lake Onego depression and the nearby territories, the catchment area changed of its southern and south-eastern sections. Today the composition of the modern sedimentary matter entering Lake Onego is determined by mixing clusters from two geochemically contrasting feeding areas: loose sediments formed by the repeatedly re-deposited products of the weathering of the Fennoscandian Shield's crystalline rock massifs, including Phanerozoic sediments; and to a lesser extent the sediments of the sedimentary cover of the Russian Platform, except the bottom sediments of the South Onego, in which Phanerozoic sedimentary formations have completely predominated throughout the lake's development.

KW - Bottom sediments

KW - Lake Onego

KW - Onego Ice Lake catchment

KW - Particulate matter in water

KW - Rare earth elements

KW - Sedimentary traps

UR - http://www.scopus.com/inward/record.url?scp=85111021029&partnerID=8YFLogxK

U2 - 10.1016/j.quaint.2021.07.011

DO - 10.1016/j.quaint.2021.07.011

M3 - Article

AN - SCOPUS:85111021029

JO - Quaternary International

JF - Quaternary International

SN - 1040-6182

ER -