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Pillow lava in the Stora Le-Marstrand formation, south-western Sweden

1984; Taylor & Francis; Volume: 106; Issue: 1 Linguagem: Inglês

10.1080/11035898409454617

0016-786X

Karl Inge Åhäll,

Geochemistry and Geologic Mapping

Abstract Pillow lava structures are found in the supracrustals south of Tjörn, south-western Sweden. The pillow lava grades into banded amphibolites, mostly with rapidly changing composition and some intermediate and acid intercalations. These amphibolites are part of the Stora Le-Marstrand formation, which is dominated by greywackes. Both pillow lavas and ordinary supracrustals are metamorphosed before the intrusion of the 1650 Ma Rönnäng tonalite. An island are continental margin environment of formation is suggested.