Abstract
Major- and trace-element content, and Sr- and Nd-isotopic composition are reported for clinopyroxenes from anhydrous spinel peridotites (SW Poland). LREE enrichment which occurs in all samples is decoupled from relatively high 143 Nd 144 Nd ratios (0.51286–0.51291), indicating that mantle metasomatism took place relatively recently. REE and HFSE (high-field strength element) abundances show marked variation but, interestingly, correlate with each other: samples with U-shaped REE patterns have Ti Zr > 700 ; samples with a REE concave-downward pattern have Ti/Zr of 20–200 and samples with a REE concave-upward pattern are characterized by Ti/Zr of 2–40. We suggest that trace-element enrichment is the result of interaction between basaltic melt migrating through the veins and contiguous wall-rock peridotites. Modal composition and trace-element characteristics of samples with U-shaped REE patterns probably reflect interaction of depleted peridotite residue with carbonatite melt.
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