GEOCHEMISTRY OF RARE-EARTH ELEMENTS IN THE SURFACE BOTTOM SEDIMENTS OF THE NORTHWESTERN PACIFIC

AbstractThe objective of this study was to analyse spatial variability of the trace elements (TEs) and rare earth elements (REEs) concentration in lake bottom sediments in Bory Tucholskie National Park (BTNP); Poland. The following research questions were posed: which factors have a fundamental impact on the concentration and spatial variability of elements in bottom sediments, which of the elements can be considered as indicators of natural processes and which are related to anthropogenic sources. The research material was sediments samples collected from 19 lakes. The concentrations of 24 TEs and 14 REEs were determined. The analyses were carried out using the inductively coupled plasma mass spectrometry (ICP-QQQ). Cluster analysis and principal component analysis were used to determine the spatial variability of the TEs and REEs concentrations, indicate the elements that are the indicators of natural processes and identify potential anthropogenic sources of pollution. The geochemical background value (GBV) calculations were made using 13 different statistical methods. However, the contamination of bottom sediments was evaluated by means of the index of geo-accumulation, the enrichment factor, the pollution load index, and the metal pollution index. The BTNP area is unique because of its isolation from the inflow of pollutants from anthropogenic sources and a very stable land use structure over the last 200 years. This study shows high variability of TE and REE concentrations in lake sediments. The values of geochemical indices suggest low pollution of lakes bottom sediments. It was found that TEs originated mainly from geogenic sources. However, the concentrations of Li, Ni, Sc, Se, Be, Se, Ag, Re, Tl, Cd, Sb and U may be related to the impact of point sources found mainly in the Ostrowite Lake. Almost all REEs concentrations were strongly correlated and their presence was linked to with geochemical processes. The elements allowing to identify natural processes and anthropogenic pollution sources were Cr, Co, Cu, Ag, Cd, Zn, Bi, Re, Ba, Al and Rb in TEs group and Nd, Gd, Yb, Lu, Eu, Dy and Ce in REEs group. The analysis shows high spatial variability of TE and REE concentrations in lake sediments. The values of geochemical indices point to low pollution of lakes sediments. The anthropogenic sources only for two lakes had an impact on concentrations of selected TEs and REEs. The analyses allowed to identify elements among TEs and REEs documenting geochemical processes and those indicating anthropogenic sources of pollution.

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Rare earth elements in suspended and bottom sediments of the Mandovi estuary, central west coast of India: Influence of mining

Estuarine Coastal and Shelf Science ◽

10.1016/j.ecss.2011.07.013 ◽

2011 ◽

Vol 94 (4) ◽

pp. 355-368 ◽

Cited By ~ 20

Author(s):

R. Shynu ◽

V. Purnachandra Rao ◽

Pratima M. Kessarkar ◽

T.G. Rao

Keyword(s):

Rare Earth ◽

Rare Earth Elements ◽

Bottom Sediments ◽

West Coast ◽

West Coast Of India ◽

Mandovi Estuary

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Rare earth elements in bottom sediments of major rivers around the Yellow Sea: implications for sediment provenance

Geo-Marine Letters ◽

10.1007/s00367-009-0142-x ◽

2009 ◽

Vol 29 (5) ◽

pp. 291-300 ◽

Cited By ~ 51

Author(s):

Zhaokai Xu ◽

Dhongil Lim ◽

Jinyong Choi ◽

Shouye Yang ◽

Hoisoo Jung

Keyword(s):

Rare Earth ◽

Rare Earth Elements ◽

Bottom Sediments ◽

Yellow Sea ◽

The Yellow Sea ◽

Sediment Provenance

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THE CARBONACEOUS ROCKS IN CRETACEOUS DEPOSITS OF THE KAMCHATSKY MYS PENINSULA: GEOCHEMISTRY, METAL ACCUMULATION AND SEDIMENTATION CONDITIONS

Tikhookeanskaya Geologiya ◽

10.30911/0207-4028-2021-40-3-41-53 ◽

2021 ◽

Vol 40 (3) ◽

pp. 41-53

Author(s):

O.L. Savelyeva ◽

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D.P. Savelyev ◽

B.G. Palesskii ◽

◽

...

Keyword(s):

Trace Elements ◽

Rare Earth ◽

Rare Earth Elements ◽

Noble Metals ◽

Sea Water ◽

Organometallic Compounds ◽

Northwestern Pacific ◽

Framboidal Pyrite ◽

Anoxic Events ◽

Carbonaceous Rocks

In the Cretaceous paleoceanic deposits of Eastern Kamchatka, carbonaceous beds have been studied, the origin of which relates to the oceanic anoxic events. In carbonaceous rocks, the contents of trace elements and noble metals: Ba, Cu, Ni, Zn, Mo, V, U, Y, Au, rare-earth elements and platinoids are increased in comparison with the hosted jaspers and limestones. In particular, the Au content in ash-laden carbonaceous rocks reaches 0.8 ppm, and Pt 2.1 ppm. The geochemical proxies Mo/Mn and V/(V + Ni) indicate the accumulation of carbonaceous deposits in euxinic conditions. The significant non-lithogenic excess Ba indicates a high bio-productivity in the upper part of the water column. High bio-productivity and euxinic conditions of sedimentation caused the enrichment of carbonaceous rocks with many trace elements. Phosphorus trapped into the sediments with bone detritus, which subsequently sorbed rare-earth elements and yttrium from sea water during its fossilization. Copper, zinc and vanadium are associated with the Fe-sulfide phase (framboidal pyrite). Noble metals accumulated during sedimentation and early diagenesis were deposited with organic matter and/or directly from seawater. In carbonaceous rocks, they appear to be in the form of organometallic compounds or enter into the composition of framboidal pyrite. The sedimentation occurred at the top of a seamount in the Pacific Ocean. The studied deposits are similar to the Cretaceous sediments that formed at the tops of seamounts in the northwestern Pacific, where carbonaceous beds are also present in the sections. Organic-rich sediments were deposited within the oxygen minimum zone during periods of maximum bio-productivity of plankton.

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GEOCHEMISTRY OF RARE-EARTH ELEMENTS IN THE RECENT BOTTOM SEDIMENTS OF AMUR BAY (Japan/East Sea)

Геология и геофизика ◽

10.15372/gig20160704 ◽

2016 ◽

Keyword(s):

Rare Earth ◽

Rare Earth Elements ◽

Bottom Sediments ◽

East Sea ◽

Amur Bay

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To reconstruction of the river’s categories which formed sedimentary basins of Riphean basins in the region of the Eastern European platform and modern south Urals juncture

Proceedings of higher educational establishments Geology and Exploration ◽

10.32454/0016-7762-2019-5-28-36 ◽

2019 ◽

pp. 28-36

Author(s):

A. V. Maslov

Keyword(s):

Rare Earth ◽

Rare Earth Elements ◽

Bottom Sediments ◽

Sedimentary Basins ◽

Southern Urals ◽

South Urals ◽

The Caspian Sea ◽

The Southern Urals ◽

Volga River ◽

Clay Rocks

Information on the distribution of trace and rare-earth elements in the bottom sediments of estuarine zones of various river categories (large rivers, rivers draining water collections, composed of sedimentary or magmatic and metamorphic rocks, etc.) of silt and pelitic dimensions can be considered as the data, reflecting characteristic features of the suspention, transported to marine basins from various catchment provinces. In certain situations, the composition of the surface bottom sediments of the marine basin is determined by the suspension composition of any large river flowing into it (the Caspian Sea and the Volga River, the Laptev Sea and the Lena River, etc.). The similarity and difference in the rare-earth elements (REE) systematics of bottom sediments of estuarine zones and suspended particulate matter of rivers of various categories is quite well expressed in the pair diagrams (La/ Yb)N–(Eu/Sm)N, (La/Yb)N–Th, etc. A comparison of the features of the distribution of REE and Th in the Riphean clay rocks of the Southern Urals and in bottom sediments of the estuaries of various categories of recent rivers has been performed. It has been concluded that clay rocks forming a typical Riphean section are formed due to the erosion of mainly or predominantly sedimentary and/or metasedimentary complexes that existed during the PreRiphean or the Riphean in the east part of the East European platform and have not survived to date.

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