Magmatism Course

Lesson 1 • Defining Magma and Lava

Distinguishes magma from lava and related terms, covering physical and chemical properties. Provides precise vocabulary used throughout the course.

Lesson 2 • Major Magma Compositional Types

Classifies magmas by silica content and alkali levels into basaltic, andesitic, dacitic, and rhyolitic types. Links composition to eruptive behavior and tectonic setting.

Lesson 3 • Overview of Volcanic Landforms

Surveys shield volcanoes, stratovolcanoes, calderas, and monogenetic fields as products of magmatism. Grounds abstract concepts in observable geological features.

Lesson 4 • Earth's Interior and Heat Sources

Examines Earth's layered structure and the thermal energy driving magma generation. Establishes the physical context for all subsequent magmatic processes.

Lesson 1 • Plate Tectonics and Magma Generation

Reviews plate boundary types and their thermal and pressure conditions relevant to melting. Frames tectonic setting as the primary control on magma genesis.

Lesson 2 • Continental Rift Magmatism

Covers lithospheric thinning, bimodal volcanism, and alkaline magma series in rift settings. Links rift evolution stages to changing magma compositions.

Lesson 3 • Hotspot and Plume Magmatism

Investigates mantle plume models and OIB geochemistry as expressions of deep-sourced magmatism. Evaluates hotspot tracks as records of plate motion.

Lesson 4 • Subduction Zone Magmatism

Explains flux melting driven by slab-derived fluids and the arc magma series. Connects subduction parameters to magma composition and volcanic arc structure.

Lesson 1 • Melt Fraction and Batch vs. Fractional Melting

Compares batch and fractional melting models and their effects on trace element and isotope signatures. Enables quantitative interpretation of geochemical data.

Lesson 2 • Thermodynamics of Melting

Introduces Gibbs free energy, solidus, and liquidus concepts governing the onset and extent of melting. Provides the quantitative basis for interpreting phase diagrams.

Lesson 3 • Mantle Mineralogy and Source Rocks

Describes peridotite mineralogy and the stability fields of olivine, pyroxene, garnet, and spinel. Connects source mineralogy to melt composition and depth of origin.

Lesson 4 • Mechanisms Triggering Partial Melting

Contrasts decompression, fluid-flux, and heat-transfer melting as the three primary triggers. Ties each mechanism to a specific tectonic environment introduced in Chapter 2.

Lesson 1 • Assimilation and Crustal Contamination

Quantifies the effects of wall-rock assimilation on magma composition using AFC equations. Identifies isotopic and trace element fingerprints of contamination.

Lesson 2 • Magma Mixing and Mingling

Distinguishes chemical mixing from physical mingling and their textural signatures in igneous rocks. Links mixing to triggering of eruptions and hybrid magma formation.

Lesson 3 • Liquid Immiscibility and Silicate-Oxide Separation

Examines unmixing of silicate and Fe-Ti oxide or carbonate melts as a differentiation pathway. Identifies immiscibility textures and their economic significance.

Lesson 4 • Fractional Crystallization Fundamentals

Explains crystal fractionation as the dominant differentiation process, using Bowen's reaction series. Predicts liquid line of descent on variation diagrams.

Lesson 1 • Plutonic Rock Families

Describes granite, diorite, gabbro, and ultramafic cumulate families with their mineralogical ranges. Connects plutonic rock types to their volcanic equivalents and source magmas.

Lesson 2 • Volcanic Rock Series and Suites

Distinguishes tholeiitic, calc-alkaline, and alkaline series using major element and normative data. Relates each series to a tectonic setting covered in Chapter 2.

Lesson 3 • Texture and Fabric in Igneous Rocks

Defines grain size, crystallinity, and fabric terms used in petrographic description. Interprets cooling history and emplacement conditions from textural evidence.

Lesson 4 • QAPF and TAS Classification Schemes

Applies the QAPF modal diagram for plutonic rocks and TAS for volcanic rocks to assign rock names. Resolves ambiguities between schemes using normative mineralogy.

Lesson 1 • Geophysical Imaging of Magma Bodies

Reviews seismic tomography, gravity, and magnetotelluric methods for detecting subsurface magma. Evaluates resolution limits and interpretation uncertainties of each technique.

Lesson 2 • Caldera-Forming Eruptions and Collapse

Analyzes the conditions leading to roof collapse and caldera formation during large-volume eruptions. Connects caldera geometry to reservoir volume and withdrawal rate.

Lesson 3 • Magma Ascent and Conduit Dynamics

Models magma rise through dikes and conduits, balancing buoyancy, viscosity, and country-rock strength. Predicts ascent rates and their influence on degassing and eruption style.

Lesson 4 • Magma Storage in the Crust

Examines mush zones, crystal-rich reservoirs, and eruptible melt lenses as components of crustal magma storage. Challenges the simple magma chamber model with modern evidence.

Lesson 1 • Radiogenic Isotope Systems

Covers Sr-Nd-Pb-Hf isotope systems as tracers of mantle reservoirs and crustal contamination. Constructs isotope mixing diagrams and evaluates mantle end-member compositions.

Lesson 2 • Tectonic Discrimination Using Geochemistry

Applies geochemical discrimination diagrams to assign tectonic setting to ancient igneous suites. Evaluates the reliability and limitations of discrimination diagram approaches.

Lesson 3 • Stable Isotopes in Igneous Systems

Applies oxygen and hydrogen isotopes to detect crustal assimilation, hydrothermal alteration, and volatile cycling. Distinguishes magmatic from meteoric water signatures.

Lesson 4 • Trace Element Systematics

Explains compatible and incompatible element behavior during melting and crystallization using partition coefficients. Applies spider diagrams and REE patterns to source and process identification.

Lesson 1 • Volcanic Gas and Ash Hazards

Quantifies SO2, CO2, and HF emissions and their atmospheric, health, and aviation impacts. Covers ash dispersal modeling and tephra fall hazard assessment.

Lesson 2 • Pyroclastic Density Currents

Analyzes the generation, flow dynamics, and depositional signatures of pyroclastic density currents. Assesses their hazard range and impact on infrastructure and populations.

Lesson 3 • Lava Flow Hazards and Behavior

Models lava flow advance rates, morphology, and cooling as functions of effusion rate and topography. Evaluates mitigation strategies for lava flow hazards.

Lesson 4 • Volcano Monitoring and Early Warning

Integrates seismic, geodetic, geochemical, and thermal monitoring methods into eruption forecasting frameworks. Evaluates alert level systems and communication protocols.