Trace element and Sr and Nd isotope geochemistry of peridotite xenoliths from the Eifel (West Germany) and their bearing on the evolution of the subcontinental lithosphere
作者： H.-G. Stosch , G.W. Lugmair
DOI: 10.1016/0012-821X(86)90111-1
关键词: Igneous rock 、 Partial melting 、 Mantle (geology) 、 Isotope geochemistry 、 Peridotite 、 Geochemistry 、 Geology 、 Xenolith 、 Amphibole 、 Metasomatism
摘要: Peridotite xenoliths from the Eifel can be divided into incompatible element-depleted and -enriched members. The depleted group is restricted to dry lherzolites whereas enriched encompasses harzburgites, websterite amphibole and/or phlogopite-bearing peridotites. Isotopically very diverse with143Nd/144Nd ranging ∼ 0.51302 0.51355 and87Sr/86Sr 0.7041 0.7019, thus occupying a field larger than expected for oceanic-type subcontinental mantle. These are derived mantle which appears have diverged bulk-earth Nd Sr isotopic evolution path 2 Ga ago as consequence of partial melting. combination high143Nd/144Nd with high87Sr/86Sr in some members depleted-xenoliths suite likely result incipient reaction element-enriched fluids In such reactions proceeded further erased any pre-enrichment isotope memory resulting smaller diversity (143Nd/144Nd∼ 0.51256–0.51273,87Sr/86Sr∼ 0.7044–0.7032). An evaluation SmHf YbHf relationships suggests that amphibole-bearing harzburgites acquired their high enrichment light rare earth elements by fluid infiltration previously peridotite rather silicate melt-induced metasomatism. Upper composed metasomatized peridotites does not represent potential source basanites nephelinites Eifel. chemical lithospheric part may it having remained isolated convecting times > 1 Ga.
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