Spinel peridotite xenoliths from the Atsagin-Dush volcano, Dariganga lava plateau, Mongolia: a record of partial melting and cryptic metasomatism in the upper mantle

1997 ◽  
Vol 126 (4) ◽  
pp. 345-364 ◽  
Author(s):  
U. Wiechert ◽  
Dmitri A. Ionov ◽  
Karl Hans Wedepohl
Keyword(s):  
Partial Melting ◽  
Upper Mantle ◽  
Spinel Peridotite ◽  
Peridotite Xenoliths

scholarly journals Texture-Temperature-Geochemistry Relationships in the Upper Mantle as Revealed from Spinel Peridotite Xenoliths from Wangqing, NE China

1998 ◽  
Vol 39 (3) ◽  
pp. 469-493 ◽  
Author(s):  
Y. Xu ◽  
M. A Menzies ◽  
P. Vroon ◽  
J.-C. Mercier ◽  
C. Lin
Keyword(s):  
Upper Mantle ◽  
Spinel Peridotite ◽  
Ne China ◽  
Peridotite Xenoliths

scholarly journals Mantle Evolution from Ocean to Arc: The Record in Spinel Peridotite Xenoliths in Mt. Pinatubo, Philippines

Minerals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 515 ◽  
Author(s):  
Betchaida Payot ◽  
Shoji Arai ◽  
Masako Yoshikawa ◽  
Akihiro Tamura ◽  
Mitsuru Okuno ◽  
...  
Keyword(s):  
Partial Melting ◽  
Earth Element ◽  
Mantle Wedge ◽  
Chromian Spinel ◽  
Spinel Peridotite ◽  
Spinel Lherzolite ◽  
Mantle Evolution ◽  
Peridotite Xenoliths ◽  
Ree Patterns ◽  
Subsequent Modification

A suite of peridotite xenoliths were collected from lahar flow deposits located close to the summit of Mt. Pinatubo. Spinel harzburgite is the most dominant lithology among dunites, pyroxenites and websterites. A rare spinel lherzolite xenolith (P12-7) is also present in this suite. The spinel lherzolite has well-preserved protogranular texture with very minimal presence of secondary amphibole, low Cr# in the chromian spinel, and depleted and hump shaped patterns of chondrite-normalized rare earth element (REE) patterns for the clinopyroxenes. In contrast, the spinel harzburgites contain abundant secondary amphiboles and orthopyroxenes, higher Cr# in the spinel, and slightly elevated patterns for the chondrite-normalized REE patterns for the amphiboles. The spinel lherzolite also exhibits higher olivine Fo content for a given spinel Cr# compared to the spinel harzburgites. The spinel lherzolite is interpreted as a typical residue from partial melting of abyssal peridotites whereas the spinel harzburgites may have formed via partial melting with subsequent modification during the influx of fluids in the mantle wedge. Our results suggest that fragments of MOR-derived lithosphere exist in the mantle wedge beneath the Philippine island arc. This work provides evidence for the conversion of abyssal to arc peridotites in the mantle wedge.

Chemical variation among French ultramafic xenoliths—evidence for a heterogeneous upper mantle

1975 ◽  
Vol 40 (310) ◽  
pp. 153-170 ◽  
Author(s):  
R. Hutchison ◽  
A. L. Chambers ◽  
D. K. Paul ◽  
P. G. Harris
Keyword(s):  
Partial Melting ◽  
Upper Mantle ◽  
Bulk Composition ◽  
Kimberlite Pipe ◽  
Chemical Variation ◽  
Peridotite Xenoliths ◽  
Ultramafic Xenoliths ◽  
Host Rocks

SummarySome 200 ultramafic xenoliths and their basaltic hosts from five French localities were studied. New analyses are presented, which show the five host-rocks to be nepheline- and olivine-normative. Seven bulk analyses of xenoliths from four localities, together with analyses of their constituent diopsides and, for six, of their orthopyroxenes, are also presented. Xenoliths from four occurrences appear to have equilibrated at pressures between about 8 to 18 kb at sub-basaltic solidus temperatures. Suites of xenoliths are chemically different. Histograms were used to determine compositions of depleted and ‘undepleted’ upper mantle. A suite of peridotite xenoliths from the Bult-fontein kimberlite pipe is no less depleted in fusible oxides than xenoliths from two French localities. ‘Undepleted’ upper mantle is very similar to ‘pyrolite’ in composition, except that the latter has much higher TiO2, Na2O, and K2O contents. No xenolith encountered in this work has a bulk composition that could yield more than 12% oceanic tholeiite on partial melting.

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