A review of the isotopic and trace element evidence for mantle and crustal processes in the Hadean and Archean: Implications for the onset of plate tectonic subduction

2008 ◽  
pp. 1-29 ◽  
Author(s):  
Steven B. Shirey ◽  
Balz S. Kamber ◽  
Martin J. Whitehouse ◽  
Paul A. Mueller ◽  
Asish R. Basu
Keyword(s):  
Trace Element ◽  
Plate Tectonic

scholarly journals Rare Earth Element and Incompatible Trace Element Abundances in Emeralds Reveal Their Formation Environments

Minerals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 513
Author(s):  
Raquel Alonso-Perez ◽  
James M. D. Day
Keyword(s):  
Rare Earth ◽  
Trace Element ◽  
Rare Earth Element ◽  
Earth Element ◽  
Regional Metamorphism ◽  
Incompatible Trace Element ◽  
Plate Tectonic ◽  
Element Abundances ◽  
Type Ia ◽  
Ree Patterns

Emeralds require the unusual association of typically compatible elements (Cr, V), with incompatible Be to form, and occur in complex tectonic settings associated with sediments (type IIB; Colombia) or, more commonly, with magmatism and regional metamorphism (IA). Precise rare earth element (REE) and incompatible trace element abundances are reported for a global suite of emeralds, enabling the identification of the environments in which they formed. Type IIB emeralds have nearly flat continental crust normalized REE patterns (La/YbCC = ~2), consistent with a sedimentary source origin. Type IA emerald REE patterns have upturns in the heavy REE (La/YbCC = ~0.3), a feature also shared with South African emeralds occurring in Archaean host rocks. Modeling of type IA emerald compositions indicates that they form from magmatic fluids of sedimentary (S)-type granite melts interacting with Cr, V-rich mafic–ultramafic crustal protoliths. This geochemical signature links emerald formation with continental suture zones. Diamonds, rubies, and sapphires have been considered as ‘plate tectonic gemstones’ based on mineral inclusions within them, or associations with plate tectonic indicators. Emeralds are distinct plate tectonic gemstones, recording geochemical evidence for origin within their mineral structure, and indicating that plate tectonic processes have led to emerald deposit formation since at least the Archaean.

Reconstructing sea turtle ontogenetic habitat shifts through trace element analysis of bone tissue

2019 ◽  
Vol 608 ◽  
pp. 247-262 ◽  
Author(s):  
MD Ramirez ◽  
JA Miller ◽  
E Parks ◽  
L Avens ◽  
LR Goshe ◽  
...  
Keyword(s):  
Trace Element ◽  
Bone Tissue ◽  
Trace Element Analysis ◽  
Sea Turtle ◽  
Element Analysis ◽  
Ontogenetic Habitat Shifts

The surface and the volume trace element compound of the of biological bone apatite

2014 ◽  
Author(s):  
Eugeniya Gusak ◽  
Kuznetsov Vladimir ◽  
Kochnko Alexandr ◽  
Gordienko Elena ◽  
Danilchenko Sergii ◽  
...  
Keyword(s):  
Trace Element ◽  
Bone Apatite
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