Imperial College London

Dr Craig Smalley

Faculty of EngineeringDepartment of Earth Science & Engineering

Visiting Professor
 
 
 
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Contact

 

c.smalley

 
 
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Location

 

Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@book{Smalley:1985,
author = {Smalley, PC and Field, D},
title = {Geochemical constraints on the evolution of the Proterozoic continental crust in southern Norway (Telemark sector).},
year = {1985}
}

RIS format (EndNote, RefMan)

TY  - BOOK
AB - This crust consists of supracrustal gneisses and several later plutonic suites intruded between 1600-1250 m.y. ago. In age order these are: metabasites and tonalites; granites; and charnockite-alkaline complexes. The metabasites and tonalites are calcic to calc-alkaline with MORB-like HFSE (P, Zr, T, HREE, Y) abundances, but enriched in LIL elements and deficient in Ta and Nb relative to other incompatible elements. The later plutonic rocks become progressively more alkaline, with higher Fe/Mg ratios, and are highly-enriched in LILE and HFSE; Nb-deficiencies are less pronounced. The chemical evolution is similar to that observed in modern cordilleran orogens, in the transition from island and primitive continental arcs to mature continental and back-arc-anorogenic environments, and is interpreted in terms of variation in sub-crustal source composition. The earliest rocks were derived from previously-depleted mantle which had experienced subduction-related enrichment in LILE via hydrous fluids originating in the subducted slab at the time of, or shortly before, magma generation. The later rocks have an increasing component derived from a within-plate mantle type, which had been modified by the introduction of non-subduction-related CO2-rich LILE- and HFSE-bearing fluids or partial melts.-J.M.H.
AU - Smalley,PC
AU - Field,D
PY - 1985///
TI - Geochemical constraints on the evolution of the Proterozoic continental crust in southern Norway (Telemark sector).
ER -