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Interstitial magmatic scapolite in glass-bearing crystalline nodules from the Kula Volcanic Province, Western Turkey

Department of Earth Sciences, Downing Street, Cambridge CB2 3EQ, UK

^* E-mail: gcs27{at}esc.cam.ac.uk

Scapolite oikocrysts, up to 3 cm in diameter, occur in cognate, cumulate nodules from the 2 Ma rift-related, alkali-basaltic Kula Volcanic Province in Western Turkey. Three scapolite-bearing nodules were found within deposits originating from two adjacent cones. They contain primocrysts of clinopyroxene, biotite, apatite and titanite, together with interstitial kaersutite, biotite, plagioclase and scapolite. Kula scapolites fall mid-way between the meionite (Ca₄[Al₆Si₆O₂₄]CO₃) and marialite (Na₄[Al₃Si₉O₂₄]Cl) end-members (Me_45-71). We believe this to be the first report of interstitial magmatic scapolite.

KEYWORDS: magmatic scapolite, interstitial, nodules, Kula