What This Document Is
This is a laboratory exercise focused on igneous rocks, designed for students enrolled in a Physical Geology course (GY 111) at the University of South Alabama. It’s structured as a problem set, requiring students to apply foundational geological concepts to understand the formation, classification, and characteristics of various igneous rock types. The exercise delves into both intrusive and extrusive igneous processes and the minerals commonly found within them. It’s intended to be completed alongside hands-on examination of rock samples (not included here).
Why This Document Matters
This exercise is crucial for any student seeking a strong grasp of igneous geology. It’s particularly helpful for those preparing for lab exams, needing to reinforce lecture material, or wanting to develop skills in geological reasoning and terminology. Successfully completing this assignment will build a solid foundation for understanding more complex geological processes later in the course, such as plate tectonics and volcanic hazards. It’s best used *after* initial instruction on igneous rocks and mineral identification.
Common Limitations or Challenges
This resource does *not* include the actual igneous rock samples needed for a complete lab experience. It also doesn’t provide detailed background reading on igneous petrology – it assumes a base level of understanding from lectures and textbooks. The exercise focuses on applying concepts rather than introducing them, so students unfamiliar with the core terminology may find it challenging without supplemental study. It does not offer completed examples or solutions to the problems presented.
What This Document Provides
* A series of targeted questions designed to test understanding of key igneous rock textures (e.g., aphanitic, phaneritic).
* Opportunities to explore the relationship between magma composition and resulting rock characteristics.
* Problems requiring definitions of important volcanic features and rock types (e.g., scoria, pumice, obsidian).
* A scenario-based question exploring the conditions necessary for the formation of exceptionally large crystals.
* A thought-provoking question regarding the historical context of specific, now-rare, igneous rock formations.
* A diagram-based exercise focused on applying Bowen’s Reaction Series to a theoretical magma chamber.
