caa a22 4500 465791301 CHVBK 20180323112025.0 cr unu---uuuuu 170327e19900601xx s 000 0 eng 10.1007/BF00320962 doi (NATIONALLICENCE)springer-10.1007/BF00320962 Pillow lavas as protoliths for eclogites: evidence from a late Precambrian-Cambrian continental margin, Seve Nappes, Scandinavian Caledonides [Elektronische Daten] [K. Kullerud, M. Stephens, E. Zachrisson] Pillow lavas containing an eclogitic mineral assemblage, locally with glaucophane/crossite, are described from the Tsäkkok Lens within the Seve Nappes, north-central Scandinavian Caledonides. Critical primary relationships to the host metasedimentary rocks which are dominated by marble and quartz-garnet-phengite schist are preserved. It is argued that these clastic rocks, and the ongoing igneous activity in the Tsäkkok Lens, are late Precambrian to Cambrian in age and that these rocks were deposited/emplaced along the outermost part of a continental margin related to the continent Baltica. Variations in the whole-rock chemistry of the eclogitic rocks within the Tsäkkok Lens suggest that most elements were mobile during post-extrusive/intrusive evolution. Only Ti, P and Y show significant magmatic trends in element vs Zr plots. Discriminant diagrams employing the elements Ti, P, Zr, Y, Nb and Cr suggest a tholeiitic protolith with a tendency towards enriched mid-ocean ridge basalt (E-MORB) affinity characterized by a relatively low Zr/Nb ratio. A similarity to metabasic rocks occurring in other Seve thrust sheets but lacking evidence for high-P metamorphism is apparent. A common origin for all these rocks is inferred. The Tsäkkok eclogites formed by ‘in situ' high-P metamorphism and provide further evidence for subduction of continental crustal material down to mantle depths. This subduction event has been related to collision of Baltica with an outboard are system during the late Cambrian to early Ordovician. Springer-Verlag, 1990 Kullerud K. Mineralogical-Geological Museum, Sars gt. 1, N-0562, Oslo 5, Norway aut Stephens M. Geological Survey of Sweden, Box 670, S-75128, Uppsala, Sweden aut Zachrisson E. Geological Survey of Sweden, Box 670, S-75128, Uppsala, Sweden aut Contributions to Mineralogy and Petrology Springer-Verlag 105/1(1990-06-01), 1-10 0010-7999 105:1<1 1990 105 410 https://doi.org/10.1007/BF00320962 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00320962 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kullerud K. Mineralogical-Geological Museum, Sars gt. 1, N-0562, Oslo 5, Norway aut NATIONALLICENCE 700 1- Stephens M. Geological Survey of Sweden, Box 670, S-75128, Uppsala, Sweden aut NATIONALLICENCE 700 1- Zachrisson E. Geological Survey of Sweden, Box 670, S-75128, Uppsala, Sweden aut NATIONALLICENCE 773 0- Contributions to Mineralogy and Petrology Springer-Verlag 105/1(1990-06-01), 1-10 0010-7999 105:1<1 1990 105 410 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer