caa a22 4500 386402809 CHVBK 20180307112206.0 cr unu---uuuuu 161130e198901 xx s 000 0 eng 10.1017/S0016756800006129 doi S0016756800006129 pii (NATIONALLICENCE)cambridge-10.1017/S0016756800006129 Foley S. F. Abt. Kosmochemie, Max-Planck-Institut für Chemie, Saarstraße 23, 6500 Mainz, F.R.G. Emplacement features of lamprophyre and carbonatitic lamprophyre dykes at Aillik Bay, Labrador [Elektronische Daten] [S. F. Foley] Alkaline and ultramafic lamprophyre dykes at Aillik Bay on the coast of central Labrador exhibit features indicative of volatile-rich conditions at the time of emplacement. Aillikites (ultramafic lamprophyres) are flanked by closely spaced fracture systems whose formation was promoted by a carbonate-rich fluid moving ahead of the intruding magma. Sannaites (alkaline lamprophyres) frequently have horned termination structures which are interpreted to be partial reconnections between dyke segments which had separated at an earlier stage of intrusion. The lamprophyre dykes comprise three sets which are interpreted as cone sheets and radial dykes related to an intrusive centre located beneath the Labrador Sea to the northeast of the coastal exposures. This complex is one of several on the margins of the Labrador Sea, and its position may be influenced by the Archean/Aphebian boundary and by a major oceanic structural feature represented by offsets in seafloor magnetic anomalies. Copyright © Cambridge University Press 1989 Geological Magazine Cambridge University Press 126/1(1989-01), 29-42 0016-7568 126:1<29 1989 126 GEO https://doi.org/10.1017/S0016756800006129 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0016756800006129 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Foley S. F. Abt. Kosmochemie, Max-Planck-Institut für Chemie, Saarstraße 23, 6500 Mainz, F.R.G NATIONALLICENCE 773 0- Geological Magazine Cambridge University Press 126/1(1989-01), 29-42 0016-7568 126:1<29 1989 126 GEO CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge