Traces of ancient mafic layers in the Tethys oceanic mantle
作者： Dmitry S. Sergeev , Arjan H. Dijkstra , Thomas Meisel , Gerhard Brügmann , Sergey A. Sergeev
DOI: 10.1016/J.EPSL.2013.10.039
关键词:
摘要: Abstract Oceanic basalts are formed by melting of a chemically and isotopically heterogeneous mantle source. The oceanic probably resembles marble cake containing layers mafic rock – perhaps recycled ocean crust stored in the for >1 billion years. Many questions about nature distribution these heterogeneities remain. Here we show that lithological isotopic traces ancient can still be seen rocks have melted to form at spreading centre Tethys Ocean. We found centimetre-scale heterogeneity initial osmium isotope ratios from Pindos Ophiolite. Deformed pyroxenite high 187 Os/ 188 Os (0.14–0.20) compared adjacent host peridotites ( Os: 0.12–0.13). These were reaction between melt derived with Re/Os ratios. interpret as wall billion-year old transformed peridotite into melt–rock reaction. relics metre-scale basaltic veins kilometre-sized domain has withstood homogenization on time scale.
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