scholarly journals Chemical disequilibrium in spinel-lherzolites from Ariege (French Pyrenees)

2019 ◽  
Keyword(s):  
Spinel Lherzolites

Silicate glasses in spinel lherzolites from Yemen: origin and chemical composition

1996 ◽  
Vol 134 (1-3) ◽  
pp. 159-179 ◽  
Author(s):  
Gilles Chazot ◽  
Martin Menzies ◽  
Ben Harte
Keyword(s):  
Chemical Composition ◽  
Silicate Glasses ◽  
Spinel Lherzolites

Minor elements in olivine from spinel lherzolite xenoliths: implications for thermobarometry

1997 ◽  
Vol 61 (405) ◽  
pp. 257-269 ◽  
Author(s):  
Suzanne Y. O'Reilly ◽  
D. Chen ◽  
W. L. Griffin ◽  
C. G. Ryan
Keyword(s):  
Trace Element ◽  
Garnet Peridotite ◽  
Spinel Peridotite ◽  
Spinel Lherzolite ◽  
Proton Microprobe ◽  
Minor Elements ◽  
Spinel Lherzolites ◽  
Peridotite Xenoliths ◽  
Trace Element Contents ◽  
Element Contents

AbstractThe proton microprobe has been used to determine contents of Ca, Ti, Ni, Mn and Zn in the olivine of 54 spinel lherzolite xenoliths from Australian and Chinese basalts. These data are compared with proton-probe data for Ni, Mn and Zn in the olivine of 180 garnet peridotite xenoliths from African and Siberian kimberlites. Fe, Mn, Ni and Zn contents are well-correlated; because the spinel lherzolite olivines have higher mean Fe contents than garnet peridotite olivines (average Fo89.6vs. Fo90–92) they also have lower Ni and higher Mn contents. Zn and Fe are well-correlated in garnet peridotite olivine, but in spinel peridotites this relationship is perturbed by partitioning of Zn into spinel. None of these elements shows significant correlation with temperature. Consistent differences in trace-element contents of olivines in the two suites is interpreted as reflecting the greater degree of depletion of Archean garnet peridotites as compared to Phanerozoic spinel lherzolites. Ca and Ti contents of spinel-peridotite olivine are well correlated with one another, and with temperature as determined by several types of geothermometer. However, Ca contents are poorly correlated with pressure as determined by the Ca-in-olivine barometer of Köhler and Brey (1990). This reflects the strong T-dependence of this barometer: the uncertainty in pressure (calculated by this method) which is produced by the ±50°C uncertainty expected of any geothermometer is ca ± 8 kbar, corresponding to the entire width of the spinel-lherzolite field at 900–1200°C.

Carbonated alkali-silicate metasomatism in the North Africa lithosphere: Evidence from Middle Atlas spinel-lherzolites, Morocco

2013 ◽  
Vol 41 ◽  
pp. 113-121 ◽  
Author(s):  
C. Natali ◽  
L. Beccaluva ◽  
G. Bianchini ◽  
R.M. Ellam ◽  
F. Siena ◽  
...  
Keyword(s):  
North Africa ◽  
Spinel Lherzolites ◽  
The North ◽  
Alkali Silicate ◽  
Middle Atlas

Upper mantle oxygen fugacity recorded by spinel lherzolites

Nature ◽  
1986 ◽  
Vol 322 (6080) ◽  
pp. 626-628 ◽  
Author(s):  
Glen S. Mattioli ◽  
Bernard J. Wood
Keyword(s):  
Oxygen Fugacity ◽  
Upper Mantle ◽  
Spinel Lherzolites

Sodium Thermometer for Pyroxenes in Garnet and Spinel Lherzolites

1980 ◽  
Vol 88 (3) ◽  
pp. 337-342 ◽  
Author(s):  
R. L. Hervig ◽  
J. V. Smith
Keyword(s):  
Spinel Lherzolites

scholarly journals Noble Gas Isotopes and Mineral Chemistry Recording Partial Melting and Subduction-Related Metasomatism in Spinel-Lherzolites from Coyhaique, Chilean Patagonia

2020 ◽  
Author(s):  
Eduardo Novais-Rodrigues ◽  
Tiago Jalowitzki ◽  
Fernanda Gervasoni ◽  
Hirochika Sumino ◽  
Yannick Bussweiler ◽  
...  
Keyword(s):  
Partial Melting ◽  
Noble Gas ◽  
Mineral Chemistry ◽  
Spinel Lherzolites ◽  
Chilean Patagonia ◽  
Noble Gas Isotopes ◽  
Gas Isotopes

Lherzolite xenoliths in kimberlites and basalts: petrogenetic and crystallochemical significance of some minor and trace elements in olivine, pyroxenes, garnet and spinel

1986 ◽  
Vol 77 (3) ◽  
pp. 181-201 ◽  
Author(s):  
R. L. Hervig ◽  
J. V. Smith ◽  
J. B. Dawson
Keyword(s):  
Published Data ◽  
Ion Microprobe ◽  
Garnet Lherzolite ◽  
Alkali Basalts ◽  
Spinel Lherzolites ◽  
Composition Space ◽  
Silicate Inclusions ◽  
The Stability ◽  
Garnet Lherzolites

ABSTRACTElectron and ion microprobe analyses for P, Si, Ti, Al, Cr, V, Sc, Fe, Mn, Mg, Ni, Co, Ca, Sr, Na, K and Li in olivine, pyroxenes and garnet in forty-two cold and twelve hot garnet lherzolites from kimberlites, nine spinel lherzolites from kimberlites and eighteen from alkali basalts, and one cold garnet lherzolite from the Malaita alnöite, are compared with published data for minerals occurring in lherzolite, harzburgite and eclogite xenoliths, for silicate megacrysts in kimberlites, and for silicate inclusions in diamonds. Despite wide ranges in the chemistry of minerals from garnet and spinel lherzolites, there are distinct regions in composition space that would enable determination of the parent lithology of disaggregated minerals in kimberlites and alkali basalts. Titanium correlates with Fe3+ in garnets. Chromium, Al, V and Sc are distributed similarly between silicates in lherzolites. Sodium correlates with trivalent ions in olivine, and increases with temperature. The distribution of Na, but not of K and Li, between olivine and clinopyroxene correlates with temperature. The regular partitioning of Ti, Mn and Ni places constraints on crystal-liquid partition coefficients. Above the stability temperature of mica, ‘metasomatising fluids’ may scavenge Cr and other trivalent ions as they increase Ti in silicates.

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