Trace element fractionation during high-grade metamorphism and crustal melting—constraints from ion microprobe data of metapelitic, migmatitic and igneous garnets and implications for Sm–Nd garnet chronology

Lithos ◽  
2006 ◽  
Vol 87 (3-4) ◽  
pp. 193-213 ◽  
Author(s):  
S. Jung ◽  
E. Hellebrand
Keyword(s):  
Trace Element ◽  
Crustal Melting ◽  
High Grade ◽  
Ion Microprobe ◽  
Grade Metamorphism ◽  
High Grade Metamorphism ◽  
Element Fractionation ◽  
Microprobe Data ◽  
Trace Element Fractionation

On high-grade metamorphism, crustal melting, migmatites and granites

Lithos ◽  
2010 ◽  
Vol 116 (3-4) ◽  
pp. v-viii
Author(s):  
Michael Brown ◽  
Olav Eklund ◽  
Fawna Korhonen ◽  
Peter Sorjonen-Ward
Keyword(s):  
Crustal Melting ◽  
High Grade ◽  
Grade Metamorphism ◽  
High Grade Metamorphism

scholarly journals Syntectonic crustal melting and high-grade metamorphism in a transpressional regime, Variscan Massif Central, France

2009 ◽  
Vol 477 (3-4) ◽  
pp. 229-243 ◽  
Author(s):  
Aude Gébelin ◽  
Françoise Roger ◽  
Maurice Brunel
Keyword(s):  
Crustal Melting ◽  
High Grade ◽  
Massif Central ◽  
Grade Metamorphism ◽  
High Grade Metamorphism

scholarly journals Assessing the Validity of Negative High Field Strength-Element Anomalies as a Proxy for Archaean Subduction: Evidence from the Ben Strome Complex, NW Scotland

Geosciences ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 338 ◽  
Author(s):  
George Guice ◽  
Iain McDonald ◽  
Hannah Hughes ◽  
Denis Schlatter ◽  
Kathryn Goodenough ◽  
...  
Keyword(s):  
Field Strength ◽  
Trace Element ◽  
High Field ◽  
Geochemical Data ◽  
High Grade ◽  
Bulk Rock ◽  
Element Mobility ◽  
High Field Strength ◽  
Grade Metamorphism ◽  
High Grade Metamorphism

The relative depletion of high field strength elements (HFSE), such as Nb, Ta and Ti, on normalised trace-element plots is a geochemical proxy routinely used to fingerprint magmatic processes linked to Phanerozoic subduction. This proxy has increasingly been applied to ultramafic-mafic units in Archaean cratons, but as these assemblages have commonly been affected by high-grade metamorphism and hydrothermal alteration/metasomatism, the likelihood of element mobility is high relative to Phanerozoic examples. To assess the validity of HFSE anomalies as a reliable proxy for Archaean subduction, we here investigate their origin in ultramafic rocks from the Ben Strome Complex, which is a 7 km2 ultramafic-mafic complex in the Lewisian Gneiss Complex of NW Scotland. Recently interpreted as a deformed layered intrusion, the Ben Strome Complex has been subject to multiple phases of high-grade metamorphism, including separate granulite- and amphibolite-facies deformation events. Additional to bulk-rock geochemistry, we present detailed petrography, and major- and trace-element mineral chemistry for 35 ultramafic samples, of which 15 display negative HFSE anomalies. Our data indicate that the magnitude of HFSE anomalies in the Ben Strome Complex are correlated with light rare earth-element (LREE) enrichment likely generated during interaction with H2O and CO2-rich hydrothermal fluids associated with amphibolitisation, rather than primary magmatic (subduction-related) processes. Consequently, we consider bulk-rock HFSE anomalies alone to be an unreliable proxy for Archaean subduction in Archaean terranes that have experienced multiple phases of high-grade metamorphism, with a comprehensive assessment of element mobility and petrography a minimum requirement prior to assigning geodynamic interpretations to bulk-rock geochemical data.

Sm-Nd garnet and U-Pb monazite dating of high-grade metamorphism and crustal melting in the West Uusimaa area, southern Finland

GFF ◽  
2005 ◽  
Vol 127 (2) ◽  
pp. 123-128 ◽  
Author(s):  
Hassina Mouri ◽  
Markku Väisänen ◽  
Hannu Huhma ◽  
Kalevi Korsman
Keyword(s):  
Crustal Melting ◽  
High Grade ◽  
The West ◽  
Monazite Dating ◽  
Grade Metamorphism ◽  
High Grade Metamorphism
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