Petrology: Principles and Practice by Gautam Sen

By Gautam Sen

Comprises the most recent examine on petrology
Principles are emphasised and clarified with examples
Includes complicated examine packing containers that focus on particular case studies
Gives scholars a style of acting calculations at a suitable point to find the beginning of rocks
This undergraduate textbook at the key topic of geology heavily follows the center curriculum followed by means of so much universities during the international and is a needs to for each geology pupil. It covers all elements of petrology, together with not just the foundations of petrology but additionally functions to the starting place, composition, and box relationships of rocks. even if petrology is often taught within the junior yr, this ebook is an invaluable source for graduate scholars as well.

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Additional info for Petrology: Principles and Practice

Sample text

Cooling of Magma and Textural Development Magma formation and crystallization are in some ways different from how a pure metal, such as gold, melts or crystallizes. 18  C. In contrast, laboratory experiments have shown that magma solidifies over a temperature range: basaltic magma, 1,230–980  C; andesitic magma, 1,050–850  C; and rhyolitic magma, 800–650  C. This is what is to be expected based on what we will learn from the simple system phase diagrams in Chap. 3. 10 shows the crystallization sequence of minerals from a basalt magma, as determined in a series of equilibrium experiments in a laboratory furnace at atmospheric pressure.

If the phenocrysts form clusters, then the texture is called glommeroporphyritic texture. Aphyric. When a rock lacks any distinct phenocrysts, its texture is described as aphyric. This texture has held special significance in igneous petrology because aphyric textured rocks are generally thought to represent actual liquids. Vesicular. This texture is common in basalt lavas, which contain numerous holes that were once filled with vapor bubbles that left during the eruption and solidification of the lava.

The terms glassy and holohyaline are used to describe the texture of such glass. However, if the magma solidifies less rapidly, the resulting rock texture is called aphanitic if it is a mixture of glass and fine crystals called crystallites (which are so small that their individual grain outlines cannot be easily deciphered with a petrographic microscope) or microlites (the crystals are more visible but still extremely small). It refers to the extent to which a magma has crystallized. The terms holocrystalline (fully crystallized, generally medium to coarse crystals; somewhat analogous to the term phaneritic), microcrystalline (crystalline but crystals are very small (<1 mm) even under a microscope: also, aphanitic), merocrystalline (mixture of crystals and glass), and holohyaline (glassy) are generally used.

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