The chondrite-normalized patterns of the oil shale curve show a distribution trend with a certain slope to the right, and the curves of LREEs
are distinctly sloping compared with those of HREEs (Fig.
Sample 15-72 from the Wellington Lake Granite contains the highest overall REE abundances, exhibits the highest normalized LREE
enriched pattern [[(La/Yb).
The higher content of large ion lithophile elements (LILEs) and LREEs
in the dykes could suggest stronger interactions with the granites, diffusion of water and alkalis, etc.
Clay minerals formed during the weathering processes absorb greater LREE
than HREE in alkaline environments (Wen et al.
A tenor de lo expuesto, se ponen en evidencia diferencias significativas entre los molinos SL1 (afin al conjunto de leucogranitos del domo del Tormes) y SL2 (afin a los leucogranitos del sector NE) fundamentalmente en el contenido en Th y LREE
, elementos fuertemente controlados por los minerales accesorios del granito.
Thorium and Nb show a similar behaviour to the LREE
, being most abundant in the red dust samples from Ormiston and Silverton, but depleted in the Ormiston river gravel.
Compared to the composition of continental crust, metatexites of the Temelin area are enriched in Ba, Rb, Th, and LREE
and slightly to moderately depleted in Sr.
11a) the TACB suite of rocks shows a successive increase in LREE
(light rare earth elements), suggesting that, over all, it might be some sort of evolutionary sequence.
2]O]: Coexisting oxalates with different structures and differentiation of LREE
8a) reveals two groupings: one group (n = 3) with significant light REE (LREE
) enrichment (~ 90 to 200 times chondrite abundance), and another group (n = 3) with a much less pronounced LREE
enrichment (~ 7 to 10 times chondrite abundance).
7A), indicating a relatively high degree of LREE
enrichment, whereas the Yb concentrations are 10 times those of chondrite (Fig.
These gabbros exhibit high incompatible trace element concentrations (LILE, LREE
, Pb), in conjunction with negative Nb-Ta-Ti anomalies, and a heterogeneous Sr-Nd isotopic composition (e.