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In geology, country rock is the rock native to an area, in contrast to any intrusion of viscous geologic material, commonly magma, or perhaps rock salt (in salt domes) or unconsolidated sediments. [1] A dike (dark) intrudes into the country rock (light), Baranof Island, Alaska, United States. Magma is typically less dense than the rock it ...
May 29, 2018 · Country rock is a term for a rock that is intruded by another rock or geologic material. Learn about the types of intrusions, the effects of contact metamorphism, and the examples of country rock and intrusions.
The term "country rock" is similar to, and in many cases interchangeable with, the terms basementand wall rocks. Country rock can denote the widespread lithologyof a region in relation to the rock which is being discussed or observed. Settings in geology when the term country rockis used include: Igneous intrusions.
All of " Devonian and younger", "Silurian", and "Ordovician" are country rock. The igneous intrusion leads to a volcanic eruption. In geology, country rock is the rock native to an area, in contrast to any intrusion of viscous geologic material, commonly magma, or perhaps rock salt (in salt domes) or unconsolidated sediments. [1]
Chapter 3 Intrusive Igneous Rocks. 3.5 Intrusive Igneous Bodies. In most cases, a body of hot magma is less dense than the rock surrounding it, so it has a tendency to move very slowly up toward the surface. It does so in a few different ways, including filling and widening existing cracks, melting the surrounding rock (called country rock[1 ...
- Steven Earle
- 2015
May 16, 2024 · Different minerals will form depending on the exact temperature and the nature of the country rock. Although bodies of magma can form in a variety of settings, one place magma is produced in abundance, and where contact metamorphism can take place, is along convergent boundaries with subduction zones, where volcanic arcs form (Figure 10.30).
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Xenolith. A xenolith ("foreign rock") is a rock fragment (country rock) that becomes enveloped in a larger rock during the latter's development and solidification. In geology, the term xenolith is almost exclusively used to describe inclusions in igneous rock entrained during magma ascent, emplacement and eruption. [1]
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