Preconcentration of rare earth elements on activated carbon and its application to groundwater and sea-water analysis

1996 ◽  
Vol 11 (9) ◽  
pp. 815 ◽  
Author(s):  
D. S. R. Murty ◽  
G. Chakrapani
Keyword(s):  
Rare Earth ◽  
Activated Carbon ◽  
Rare Earth Elements ◽  
Water Analysis ◽  
Sea Water ◽  
Sea Water Analysis

Overview of Analytical Methodologies for Sea Water Analysis: Part I—Metals

2005 ◽  
Vol 35 (4) ◽  
pp. 247-288 ◽  
Author(s):  
T. Prasada Rao ◽  
P. Metilda ◽  
J. Mary Gladis
Keyword(s):  
Water Analysis ◽  
Sea Water ◽  
Sea Water Analysis

scholarly journals Geochemistry and Fuid-Inclusion Microthermometry of the Farsesh Barite Deposit, Iran

Geologos ◽  
2014 ◽  
Vol 20 (3) ◽  
pp. 201-214 ◽  
Author(s):  
Alireza Zarasvandi ◽  
Nazanin Zaheri ◽  
Houshang Pourkaseb ◽  
Abbas Chrachi ◽  
Hashem Bagheri
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Open Space ◽  
Sea Water ◽  
Shear Zones ◽  
Major And Trace Elements ◽  
Petrographic Analysis ◽  
Two Phase ◽  
Moderate Salinity ◽  
Scatter Plots

Abstract The Permian carbonate-hosted Farsesh barite deposit is located southeast of the City of Aligudarz in the province of Lorestan, Iran. Structurally, this deposit lies in the Zagros metallogenic belt and the Sanandaj-Sirjan Zone. Barite mineralisations occur as open-space flling veins, and as massive and replacement ores along fractures, faults and shear zones of the Permian carbonate host rocks. In order to determine the structure, in addition to pe-trographic and fuid-inclusions studies, an ICP-MS analysis was carried out in order to measure the major as well as the trace and rare earth elements. The Farsesh barite deposit has a simple mineralogy, of which barite is the main mineral, followed by calcite, dolomite, quartz, and opaque minerals such as Fe-oxides. Replacement of bar-ite by calcite is common and is more frequent than space-flling mineralisation. Sulphide minerals are minor and mainly consist of chalcopyrite and pyrite, which are altered by weathering to covellite, malachite and azurite. Petrographic analysis and micro-thermometry were carried out on the two-phase liquid/vapour inclusions in ellipsoidal or irregularly shaped minerals ranging in size from 5–10 µm. The measurements were conducted on fuid inclusions during the heating and subsequent homogenisation in the liquid phase. The low homogenisation temperatures (200–125°C) and low to moderate salinity (4.2–20 eq wt% NaCl) indicate that the barite had precipitated from hydrothermal basinal water with low to moderate salinity. It appears from the major and trace elements that geochemical features such as Ba and Sr enrichment in the barite samples was accompanied by depletion of Pb, Zn, Hg, Cu and Sb. The geochemistry of the rare earth elements, such as low σREE concentrations, LREE-enrichment chondrite-normalised REE patterns, the negative Ce and positive Eu anomalies, the low Ce/La ratio and the positive La and Gd anomalies, suggest that the Farsesh barite was deposited from hydrothermally infuenced sea water. The Farsesh deposit contains low-temperature hydrothermal barite. The scatter plots of the barite (close to sea water) in different areas on the CeN/SmN versus CeN/YbN diagram support the possibility that the barite was formed from seawater-bearing hydrothermal fuids.

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

2021 ◽  
Vol 40 (3) ◽  
pp. 41-53
Author(s):  
O.L. Savelyeva ◽  
◽  
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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