scholarly journals Contrasting peridotite xenolith suites from the Letseng kimberlites: inferences for the Lesotho mantle

2019 ◽  
Keyword(s):  
Peridotite Xenolith

Nature and evolution of the Slave Province subcontinental lithospheric mantleThis article is one of a series of papers published in this Special Issue on the theme Lithoprobe — parameters, processes, and the evolution of a continent.

2010 ◽  
Vol 47 (4) ◽  
pp. 369-388 ◽  
Author(s):  
Larry M. Heaman ◽  
D. Graham Pearson
Keyword(s):  
Great Depth ◽  
Peridotite Xenolith ◽  
Special Issue ◽  
Mantle Material ◽  
Slave Craton ◽  
Multiple Origins ◽  
Slave Province ◽  
Abundant Evidence ◽  
Subducted Oceanic Crust ◽  
Continental Lithospheric Mantle

A review of the ages determined for mantle material (xenoliths and xenocrysts entrained in kimberlite) derived from the Slave Province continental lithospheric mantle (CLM) indicates that a portion of the central Slave lithosphere may be ancient (3.5–3.3 Ga) harzburgite, but the majority of this lithosphere is much younger (2.9–2.0 Ga). Relying on the most robust chronometers, the majority of Slave lithosphere peridotite formed in the Neoarchean (peak at 2.75 Ga), whereas the majority of eclogite formed in the Paleoproterozoic (2.2–2.0 Ga). The northern Slave lithosphere contains evidence of peridotite xenolith ages that young with depth. The Paleoproterozoic eclogites may have multiple origins including remnants of subducted oceanic crust and mafic–ultramafic magmas that crystallized at great depth (100–200 km). Re–Os studies of sulfide inclusions in diamond indicate that some diamonds currently mined are ancient (∼3.5 Ga), but many Slave diamonds could be considerably younger. Most eclogitic diamonds recovered from the Slave craton are interpreted to be related to the formation of Paleoproterozoic eclogite. There is abundant evidence for Mesoproterozoic modification of the Slave lithosphere (e.g., heating by magma emplacement at great depth and metasomatism) and possible new addition to the lithosphere at that time. The Canadian Slave and African Kaapvaal lithospheres have similar peaks in cratonic peridotite formation ages at about 2.8 Ga, indicating that a large portion of the CLM in these two cratons formed and stabilized in the Neoarchean. One difference is that the Slave peridotites are much less enriched in SiO2, possibly reflecting the more metasomatized nature of the Kaapvaal CLM. The dominance of Paleoproterozoic formation ages for Slave mantle eclogites contrasts with the dominance of Neoarchean formation ages for Kaapvaal mantle eclogites.

Frozen melt–rock reaction in a peridotite xenolith from sub-arc mantle recorded by diffusion of trace elements and water in olivine

2015 ◽  
Vol 422 ◽  
pp. 169-181 ◽  
Author(s):  
P.M.E. Tollan ◽  
H.St.C. O'Neill ◽  
J. Hermann ◽  
A. Benedictus ◽  
R.J. Arculus
Keyword(s):  
Trace Elements ◽  
Peridotite Xenolith

A unique diamondiferous peridotite xenolith from the Udachnaya kimberlite pipe, Yakutia: role of subduction in diamond formation

2015 ◽  
Vol 56 (1-2) ◽  
pp. 306-320 ◽  
Author(s):  
A.M. Logvinova ◽  
L.A. Taylor ◽  
E.N. Fedorova ◽  
A.P. Yelisseyev ◽  
R. Wirth ◽  
...  
Keyword(s):  
Kimberlite Pipe ◽  
Peridotite Xenolith ◽  
Diamond Formation

scholarly journals A Peridotite Xenolith from Garnet-Stability Field beneath Aitutaki: An Implication for Small-Scale Convection

2020 ◽  
Author(s):  
Norikatsu Akizawa ◽  
Kazuhito Ozawa ◽  
Simon Wallis ◽  
Akihiro Tamura ◽  
Akira Ishikawa ◽  
...  
Keyword(s):  
Peridotite Xenolith ◽  
Small Scale ◽  
Stability Field ◽  
Garnet Stability Field
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