Computer Science
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993e%26psl.119..627l&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 119, no. 4, p. 627-634
Computer Science
5
Earth Crust, Earth Mantle, Lithology, Peridotite, Spinel, Sulfides, Sulfur, Basalt, Chondrites, Gold, Lithosphere, Magnesium Oxides, Mongolia, Palladium, Siberia
Scientific paper
In a recent paper, Ionov et al. reported sulfur concentrations ranging between 6 and 26 ppm (average 18 ppm) for a suite of 90 basalt-borne spinel and garnet peridotite xenoliths from central Asia. They conclude that the sulfur content of the xenolith source region in the upper mantle is typically 20-50 ppm. Previous determinations on compositionally similar Iherzolitic material from large tectonically emplaced mantle slices (orogenic massifs) led to a completely different view, with S contents clustering around 200 +/- 50 ppm in undepleted to slightly depleted Iherzolites. This later value fits rather well the model S content for mid ocean ridge basalt (MORB) source mantle as well as primitive mantle estimates. Ivnov et al. conclude that basalt-borne xenoliths and massive peridotites may have sampled different mantle reservoirs in regard to S, the former being representative of the rigid continental mantle and the later of the convecting MORB source asthenosphere. Meanwhile, however, they cast some doubt on the representativity of the massive peidotites as regards mantle sulfur. Sulfur is of prime concern in mantle geochemistry because sulfides concentrate 60-80% of the total Pd and Au content present in the upper mantle. The existence of two mantle reservoirs with contrasting ranges of sulfur concentrations should result in significant differences in the contents of these elements. The author attempts to re-emphasize some results from previous publications that have been misquoted by Ionov et al. and reassesses some of the literature data relevant to mantle xenoliths and used by Ionov et al. to support their view of the sulfur content of the subcontinental upper mantle. Finally the author envisages the implication of two contrasting mantle sulfur reservoirs for the distriburtion of siderophile elements.
No associations
LandOfFree
Comment on 'Content and isotopic composition of sulphur in ultramafic xenoliths from central Asia' by D. A. Ionov, J. Hoefs, K. H. Wedepohl and U. Wiechert does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Comment on 'Content and isotopic composition of sulphur in ultramafic xenoliths from central Asia' by D. A. Ionov, J. Hoefs, K. H. Wedepohl and U. Wiechert, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Comment on 'Content and isotopic composition of sulphur in ultramafic xenoliths from central Asia' by D. A. Ionov, J. Hoefs, K. H. Wedepohl and U. Wiechert will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1326570