Geochemical and Sr–Nd–Pb isotopic compositions of Mts Pieniny dykes and sills (West Carpathians): Evidence for melting in the lithospheric mantle
作者： Teresa Trua , Giancarlo Serri , Krzysztof Birkenmajer , Zoltán Pécskay
DOI: 10.1016/J.LITHOS.2006.01.001
关键词: Amphibole 、 Basalt 、 Mantle (geology) 、 Plagioclase 、 Andesites 、 Geochemistry 、 Volcanic rock 、 Partial melting 、 Volcanic arc 、 Geology
摘要: Abstract Mineralogical, geochemical and Sr–Nd–Pb isotopic data are presented for the Middle Miocene (13.5–10.8 Ma) Mts Pieniny magmatic rocks which occur in a portion of outermost post-collisional volcanic arc Carpathian orogen. The analysed cover compositional range from basaltic andesites to medium-K calc-alkaline series. Despite their arc-like trace element signature, show unusual compositions different Neogene–Quaternary erupted nearby Carpathian–Pannonian region. Their 87Sr / 86Sr (0.7053–0.7070) 143Nd / 144Nd (0.5121–0.5124) ratios suggest that these have originated lithospheric sources enriched Rb with low Sm / Nd ratios. Pb (206Pb / 204Pb = 18.62–18.86; 207Pb / 204Pb = 15.66–15.75; 208Pb / 204Pb = 38.74–39.84) also consistent origin rocks. Sr Nd depleted mantle model ages parental magmas derived metasomatized subcontinental recording ancient (> 1.1 Ga) subduction-related enrichments. Geochemical features basic allow an estimate mineralogy source small (from 11 up 15) La / Yb lack significant Eu anomalies preclude presence residual garnet plagioclase, respectively; Rb / Sr Rb / Ba as well observed Ba / Th, K / Ba require involvement heterogeneous terms amphibole abundance. delamination process European plate occurred this sector orogen during should favoured partial melting amphibole-bearing veins within overriding Alcapa micro-plate, giving rise magma genesis segment.
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