Origin of cratonic lithospheric mantle roots: A geochemical study of peridotites from the North Atlantic Craton, West Greenland

2008 ◽  
Vol 274 (1-2) ◽  
pp. 24-33 ◽  
Author(s):  
N. Wittig ◽  
D.G. Pearson ◽  
M. Webb ◽  
C.J. Ottley ◽  
G.J. Irvine ◽  
...  
Keyword(s):  
North Atlantic ◽  
Lithospheric Mantle ◽  
West Greenland ◽  
The North ◽  
Geochemical Study ◽  
The North Atlantic ◽  
North Atlantic Craton

scholarly journals Trace-element abundances in the shallow lithospheric mantle of the North Atlantic Craton margin: Implications for melting and metasomatism beneath Northern Scotland

2015 ◽  
Vol 79 (4) ◽  
pp. 877-907 ◽  
Author(s):  
Hannah S. R. Hughes ◽  
Iain McDonald ◽  
John W. Faithfull ◽  
Brian G. J. Upton ◽  
Hilary Downes
Keyword(s):  
Trace Element ◽  
North Atlantic ◽  
Lithospheric Mantle ◽  
Geographical Location ◽  
Mantle Xenoliths ◽  
Dyke Swarm ◽  
Element Abundances ◽  
The North ◽  
The North Atlantic ◽  
North Atlantic Craton

AbstractBulk rock geochemistry and major- and trace-element compositions of clinopyroxene have been determined for three suites of peridotitic mantle xenoliths from the North Atlantic Craton (NAC) in northern Scotland, to establish the magmatic and metasomatic history of subcontinental lithospheric mantle (SCLM) below this region. Spinel lherzolites from the southernmost locality (Streap Com'laidh) have non-NAC mantle compositions, while the two northern xenolith suites (Loch Roag and Rinibar) are derived from the thinned NAC marginal keel. Clinopyroxene compositions have characteristic trace-element signatures which show both 'primary' and 'metasomatic' origins. We use Zr and Hf abundances to identify ancient cryptic refertilization in 'primary' clinopyroxenes. We suggest that Loch Roag and Rinibar peridotite xenoliths represent an ancient Archaean-Palaeoproterozoic SCLM with original depleted cratonic signatures which were overprinted by metasomatism around the time of intrusion of the Scourie Dyke Swarm (∼2.4 Ga). This SCLM keel was preserved during Caledonian orogenesis, although some addition of material and/or metasomatism probably also occurred, as recorded by Rinibar xenoliths. Rinibar and Streap xenoliths were entrained in Permo-Carboniferous magmas and thus were isolated from the SCLM ∼200 Ma before Loch Roag xenoliths (in an Eocene dyke). Crucially, despite their geographical location, lithospheric mantle peridotite samples from Loch Roag show no evidence of recent melting or refertilization during the Palaeogene opening of the Atlantic.

scholarly journals Enriched lithospheric mantle keel below the Scottish margin of the North Atlantic Craton: Evidence from the Palaeoproterozoic Scourie Dyke Swarm and mantle xenoliths

2014 ◽  
Vol 250 ◽  
pp. 97-126 ◽  
Author(s):  
Hannah S.R. Hughes ◽  
Iain McDonald ◽  
Kathryn M. Goodenough ◽  
T. Jake R. Ciborowski ◽  
Andrew C. Kerr ◽  
...  
Keyword(s):  
North Atlantic ◽  
Lithospheric Mantle ◽  
Mantle Xenoliths ◽  
Dyke Swarm ◽  
The North ◽  
The North Atlantic ◽  
North Atlantic Craton
Sign in / Sign up

Export Citation Format

Share Document