Anomalously high δD values in the mantle

Details Anomalously high δD values in the mantle Anomalously high δD values in the mantle

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29u...4x&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 21, pp. 4-1, CiteID 2008, DOI 10.1029/2001GL013887

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Geochemistry: Chemical Evolution, Geochemistry: Composition Of The Mantle, Geochemistry: Isotopic Composition/Chemistry

Scientific paper

Hydrogen isotopic compositions of four amphibole grains from three lherzolite xenoliths hosted in Cenozoic basanites of Nushan, eastern China have been analyzed by ion microprobe. δD values of all analyzed points range from -94 to +46‰. Large heterogeneities of D/H ratios within single grains have been observed with variations of δD up to 80‰ on the scale of less than 400 μm. Neither correlation between δD values and water contents of the analyzed points nor regular variation between δD values and positions of analyzed points within the same grain can be found, implying that the scatter of δD values could not result from a late shallow process such as hydrogen loss or hydrothermal alterations and should be considered as inherited from the source at depth. Chemical compositions of Nushan amphiboles are very homogeneous, excluding the possibility that the scatter of δD values could arise from variable fractionation factors between a single fluid source and minerals. Therefore, metasomatic fluids responsible for the formation of Nushan amphiboles should have variable and unusually high hydrogen isotopic compositions. We suggest that this variation in the metasomatic fluids could be related to melt degassing in the mantle source.

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