Xenoliths With Granite

I can t think of any country rock that would look like that.

Xenoliths with granite.

The xenolith chemistry compares well with that of the more basic dykes with the xenoliths forming a coherent group over the compositional range 56 to 674 sia. Xenoliths which represent pieces of older rock incorporated into the magma while it was still fluid may be located near their original positions of detachment or may have settled deep into the intrusion if their density is greater. The display label next to it read granite with xenolith and a sentence explaining what xenolith meant. Xenoliths may be engulfed along the margins of a magma chamber torn loose from the walls of an erupting lava conduit or explosive diatreme or picked up along the base of a flowing body of lava on the earth s surface.

A xenocryst is an individual foreign crystal included within an igneous body. Xenoliths are different types of rock embedded in igneous rock. Xenoliths are torn from deep cracks or pipes in the earths surface. As the molten material rises it tears off bits and pieces of the magma pipe in which it is traveling.

Am i right in thinking its a mantle xenolith though. I n the northern coastal region of brittany in the neighbourhood of trégastel and ploumanac h pl xviii to the north of lannion a red mainly porphyritic granite is admirably exposed in shore and inland sections and is remarkable for the number of xenoliths which it contains of a kind usually referred to as basic segregations or basic patches. Frustrating lack of locality or mineralogy info. This page describes a number of features found in six mile lagoon in kangaroo island where an older coarse grained gneiss with large euhedral phenocrysts and xenoliths are transferred into a new unfoliated granite by physical disaggregation of the pre existing granite.