scholarly journals The character of organic matter and the partitioning of trace and rare earth elements in black shales Blondeau Formation Chibougamau Quebec

1987 ◽  
Author(s):  
Larry Tait
Keyword(s):  
Organic Matter ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Black Shales

Distribution of rare earth elements in some North Atlantic Kimmeridgian black shales

Nature ◽  
1979 ◽  
Vol 278 (5702) ◽  
pp. 339-341 ◽  
Author(s):  
HENNING DYPVIK ◽  
ARILD O. BRUNFELT
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
North Atlantic ◽  
Black Shales

Mobility of Uranium, Thorium and Lanthanides Around the Bangombe Natural Reactor (Gabon)

1994 ◽  
Vol 353 ◽  
Author(s):  
R. Bros ◽  
F. Gauthier-Lafaye ◽  
P. Larque ◽  
J. Samuel ◽  
P. Stille
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Clay Minerals ◽  
Nuclear Reactor ◽  
Black Shales ◽  
Weathering Profile ◽  
The Core ◽  
Reducing Conditions ◽  
Isotopic Studies ◽  
Textural Evidence

AbstractNew mineralogical and isotopic studies were carried out on samples from the Bangombé natural nuclear reactor. This reactor is located at shallow depth in the weathering profile and has been subjected to severe supergene alteration. Textural evidence indicates partial dissolution of uraninite in the Bangombé ore related to precipitation of Fe-Ti oxi-hydroxides and clay minerals (kaolinite and metahalloysite). As a consequence of the alteration of the uraninite, uranium and f issiogenic rare earth elements were released in the clayey border of the reactor, whereas radiogenic 232Th remained confined in the close vicinity of the core. A retention effect is also evidenced, under reducing conditions, in the black shales located above the reactor.

Influence of dissolved organic matter on rare earth elements and yttrium distributions in coastal waters

2010 ◽  
Vol 26 (2) ◽  
pp. 123-135 ◽  
Author(s):  
P. Censi ◽  
P. Zuddas ◽  
L. A. Randazzo ◽  
F. Saiano ◽  
S. Mazzola ◽  
...  
Keyword(s):  
Organic Matter ◽  
Rare Earth ◽  
Dissolved Organic Matter ◽  
Rare Earth Elements ◽  
Coastal Waters

Rare Earth Elements (REE) as Transformation Indicators of Organic Matter; Case Study of the Woodford Shale, North Central Oklahoma

2013 ◽  
Author(s):  
D. Ramirez-Caro ◽  
M. Totten ◽  
S. Chaudhuri ◽  
N. Clauer ◽  
R. Boutin ◽  
...  
Keyword(s):  
Organic Matter ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Woodford Shale ◽  
North Central

scholarly journals Rare Earth Elements of Ajali Sandstone, SW, Anambra Basin in Nigeria: Implication for Soil Genesis

2021 ◽  
Vol 24 (11) ◽  
pp. 1999-2004
Author(s):  
M Ilevbare
Keyword(s):  
Organic Matter ◽  
Rare Earth ◽  
Soil Organic Matter ◽  
Rare Earth Elements ◽  
Inductively Coupled Plasma ◽  
Organic Matter Content ◽  
Matter Content ◽  
Fractionation Process ◽  
Anambra Basin ◽  
And Migration

The Ajali Sandstone, South-western, Anambra Basin, was studied for Rare Earth Elements (REEs), using a Phillips 45 channel Inductively Coupled Plasma (ICP) Emission Spectrometer. The standard deviation of the REEs (Dy, Er, Eu, Y, Yb, La and Nd) averages 3.5 mg/L, 0.34 mg/L, 0.32 mg/L, 3.93 mg/L, 1.96 mg/L, 4.02 mg/L and 2.24 mg/L respectively for each of the sampled locations. The REEs concentrations showed both positive and negative concentration anomalies. The enrichment or depletion of the REEs is generally attributed to their tendency to be incorporated into plagioclase preferentially over other minerals. The Ajali Formation is predominantly sand/sandstone, with clay occurring only as intercalations/thin beds of clay drapes with the increasing particle size of the sand grains, makes the rate of adsorption and distribution of REEs in the soil low, and explains the low values of REEs concentration. Soil organic matter (SOC) plays an important role in the adsorption and migration of REEs in the Ecosystems. The SOC is linearly associated with REEs Concentration as it increases with increasing content of SOC. The Ajali Sandstone studied falls in the vicinity of abandoned cropland to cropland in a lower/gentle slope region, correspondingly low in soil organic matter content and as such slow rate of distribution and migration of REEs concentrations in the Ajali Sandstone. The sesquioxides such as Fe oxides increases as REEs contents increases. The 0.46 mean value of Fe2O3 in the Sandstone of the area studied implies a low REEs adsorption rate and subsequently the very low REEs concentrations of the soils. The istribution of REEs within the Ajali Formation soils were grossly affected by the factors that influenced the adsorption and migration rate of the minerals during magmatic fractionation process, hence the low REEs concentration of the Sediments. Keywords`: Sansdstone, Anambra Basin, Rare Earth Elements, Magmatic fractionation

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