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For this topic, you will choose one (1) topic from the attached list and construct one one-page concept sketch. Remember that a concept sketch consists of a sketch (or series of sketches), labels, and complete sentences written around the sketch describing the important processes or parts of the sketch.
 Oil and gas of the Paradox Basin: the location and age of the basin, its interpreted tectonic setting, the sequence of rocks, and the origin and geologic trapping of petroleum
 Oil and gas of the Permian Basin: the location and age of the basin, its interpreted tectonic setting, the sequence of rocks, and the origin and geologic trapping of petroleum
 Limestone resources of the southwest United States: the location, age, and formation names of the main sources of limestone used in the production of cement and lime in Arizona, Utah, Nevada, and southern California



Answer :

Rocks with a hornfels texture are typically found in the region of contact metamorphism, which is a temperature-dependent kind of metamorphism in which pressure has very little or nearly no impact.

Contact metamorphism facies primarily come in four different varieties.

  • Albite Epidote Hornfels Facies: Quartz, Epidote, and Actinolite are Common minerals
  • Minerals such as hornblende and plagioclase are common in the hornblende hornfels facies.
  • Orthopyroxene, sillimanite, and cordierite are minerals found in the pyroxene hornfels facies.
  • Wollastonite, sanidine, and anorthite are common minerals in the highest temperature facies, the Sabrina Hornfels facies.

Some key phrases in relation to contact metamorphism

  • The area surrounding the igneous intrusion, where metamorphism occurs, is known as the contact aurole. Arenaceous rock typically has a narrow aurole, whereas argillaceous rock typically has a wide aurole.
  • A region with the same temperature and pressure conditions and the same mineral assemblages is called a metamorphism facies. For instance, granulite and green schist facies.

Learn more about Metamorphism, here

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