What This Document Is
This is a comprehensive study guide focusing on the classification of igneous rocks, a core component of petrology and mineralogy. It delves into the systematic organization of these rocks based on their mineral composition and provides a foundational understanding of the principles used by geologists in their identification and categorization. The guide originates from a GEOL 284 course at West Virginia University, offering a university-level perspective on the subject.
Why This Document Matters
This resource is invaluable for students enrolled in introductory or intermediate igneous petrology, mineralogy, or geology courses. It’s particularly helpful when you’re learning to differentiate between various igneous rock types and understand the reasoning behind their classification. It’s also beneficial for anyone preparing for fieldwork where accurate rock identification is crucial. If you’re struggling to grasp the standardized methods used to categorize igneous rocks, this guide will provide a structured learning path.
Common Limitations or Challenges
This guide focuses specifically on the theoretical framework of igneous rock classification. It does *not* provide detailed field identification guides, instructions for laboratory procedures, or in-depth coverage of the geological processes that *form* igneous rocks – only how they are categorized once formed. It assumes a basic understanding of mineral properties and geological terminology. It also doesn’t cover sedimentary or metamorphic rocks.
What This Document Provides
* An overview of a widely accepted igneous rock classification system.
* Key definitions of terms used in igneous rock classification (e.g., Mode, felsic minerals).
* Explanations of the roles of specific minerals (Quartz, Alkali Feldspar, Plagioclase, Feldspathoids) in classification.
* Discussion of how to utilize specific diagrams and calculations for rock categorization.
* Insight into the relationship between chemical composition and rock classification.
* An exploration of the major elements found in igneous rocks and their significance.