Trace and rare earth element geochemistry of the black and grey shales of the Calabar Flank, Southeastern Nigeria: constraints on the depositional environment and the degree of metal enrichment

2020 ◽  
Author(s):  
Christopher Iorfa Adamu ◽  
Benjamin Odey Omang ◽  
Oluwaseye Peter Oyetade ◽  
Otu Johnson ◽  
Therese Ntonzi Nganje
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Depositional Environment ◽  
Earth Element ◽  
Metal Enrichment ◽  
Element Geochemistry ◽  
Southeastern Nigeria

Trace and rare earth element geochemistry of Jurassic mudstones in the northern Qaidam Basin, northwest China

Geochemistry ◽  
2012 ◽  
Vol 72 (3) ◽  
pp. 245-252 ◽  
Author(s):  
Jian Cao ◽  
Ming Wu ◽  
Yan Chen ◽  
Kai Hu ◽  
Lizeng Bian ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
Qaidam Basin ◽  
Northwest China ◽  
Element Geochemistry

Paleoenvironments revealed by rare-earth element systematics in vertebrate bioapatite from the Lower Devonian of Svalbard

2016 ◽  
Vol 53 (8) ◽  
pp. 788-794
Author(s):  
Živilė Žigaitė ◽  
Alexandre Fadel ◽  
Alberto Pérez-Huerta ◽  
Teresa Jeffries ◽  
Daniel Goujet ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Lower Devonian ◽  
Depositional Environment ◽  
Earth Element ◽  
Long Distance ◽  
Dental Tissues ◽  
Abundance Patterns ◽  
The Eu

In situ rare-earth element (REE) compositions have been measured in early vertebrate microremains from the Lower Devonian basin of Andrée Land (Svalbard), with the aim of obtaining information about their early depositional environment and potential reworking. Vertebrate microremains with different histology were used for the analyses, sourced from two different localities of marginal marine to freshwater sediments from geographically distant parts of the Grey Hœk Formation (Skamdalen and Tavlefjellet members). We selected thelodont and undescribed ?chondrichthyan scales, which allowed us to define potential taxonomic, histological, and taphonomic variables of the REE uptake. Results showed REE concentrations to be relatively uniform within the scales of each taxon, but apparent discrepancies were visible between the studied localities and separate taxa. The compilation of REE abundance patterns as well as REE ratios have revealed that thelodont and ?chondrichthyan originating from the same locality must have had different burial and early diagenetic histories. The shapes of the REE profiles, together with the presence and absence of the Eu and Ce anomalies, equally suggested different depositional and diagenetic environments for these two sympatric taxa resulting from either stratigraphical or long-distance reworking. The REE concentrations appear to have visible differences between separate dental tissues, particularly between enameloid and dentine of thelodonts, emphasizing the importance of in situ measurements in microfossil biomineral geochemistry.

Rare-earth element geochemistry of eclogites from the ultra-high pressure metamorphic belt in central China

2000 ◽  
Vol 19 (1) ◽  
pp. 35-44 ◽  
Author(s):  
Zhilong Huang ◽  
Congqiang Liu ◽  
Yaoguo Hu ◽  
Jianming Zhu ◽  
Huayun Xiao ◽  
...  
Keyword(s):  
High Pressure ◽  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
Central China ◽  
Element Geochemistry ◽  
Metamorphic Belt ◽  
Ultra High Pressure
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