Abstract
Abstract Mineral graded rhythmic layering occurs throughout most of the Fongen—Hyllingen basic complex. Non-cumulate, fine-grained, granular rocks are found as a conformal part of the layered gabbros. In one particular locality isomodal coarse-grained layered structures are developed within these non-cumulate granular rocks. These layers range mineralogically from olivine + Ca-rich pyroxene + Ca-poor pyroxene + plagioclase to amphibole + Ca-poor pyroxene + plagioclase. The sudden appearance of high concentrations of amphibole, without indications of amphibole primocrysts in the surrounding granular rocks or in adjacent normal rhythmically layered gabbro, is difficult to interpret in the light of the conventional cumulate theory. Heterogeneous nucleation and growth close to or on the bottom of the magma chamber is preferred for the origin of the layered structures.
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