Columnar-Dendritic Feldspars in the Lardalite Intrusion, Oslo Region, Norway: 1. Implications for Unilateral Solidification of a Stagnant Boundary Layer

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Abstract
Feldspars with exceptionally coarse, columnar-dendritie morphologies, oriented perpendicular to the border, are developed in the contact zones of the lardalite intrusion, Oslo Region, Norway. A marginal picrite zone with dendritic olivines and feldspars is succeeded by a monomineralic zone of columnar feldspars, attaining a remarkably regular textural pattern which resembles the cellular substructure of metallic substances. The inner portion of the comb-textured contact zone shows successive layers of dendritic feldspars alternating with dendritic Ca-rich pyroxenes and nephelines.

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