Study guide GEO - WHAT TO KNOW LIST GEOLOGY 100 EXAM II...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
WHAT TO KNOW LIST, GEOLOGY 100 EXAM II, WEDNESDAY, MARCH 2 Exam II will cover the following topics. If a particular topic is not covered or only partially covered in class, you are responsible for learning about it by doing the reading assignments in the textbook. If a topic is NOT listed here, IT WILL NOT BE ON THE TEST! Geothermal gradient: The rate temp. increases with depth in the earth. Partial melting: Some rock melts, some doesn’t, different melting points of the minerals Variables affecting melting – pressure (decompression melting), addition of volatiles (water), heat transfer Igneous textural terms – phaneritic, aphanitic, phenocrysts, porphyry, pegmatite, volcanic glass (obsidian): Phaneritic: Minerals cooled slowly & had time to grow; visible minerals. Aphanitic: cooled quickly, very fin grained. Porphyry: magma cools slowly causing minerals to grow & magma erupts, bringing crystallized minerals with it. Pegmatite: very coarse grained. Obsidian: Glassy Rock Chemically equivalent intrusive & extrusive igneous rock types – peridotite & komatiite, gabbro & basalt, diorite & Magma compositions (ultramafic, mafic, intermediate, silicic) and characteristics: Ultramafic: very low silica. Mafic: Low silica. Intermediate: Intermediate silica. Silicic: High silica Fractional crystallization: when magma changes as it cools Bowen’s reaction series: Minerals stick together by crystallizing temps. Magmatic mineral deposits - Layered igneous intrusions, pegmatites, granites: Intrusive rock bodies – pluton, batholith, sill, dike Volcano types – shield, composite, cinder cone
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 2

Study guide GEO - WHAT TO KNOW LIST GEOLOGY 100 EXAM II...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online