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Details Title: Pyroclastic Rocks Description: flashcards for my volcanology class Total Flash Cards: 6 Created: 10/22/2006 14:27:05	To study from this set of flash cards, or to create your own your own study flash cards, register HERE. If you are already a registered user, CLICK HERE.
Cards Term 15 MECHANISMS OF MAGMA AND GLASS FRAGMENTATION Definition -MAGMATIC -PHREATOMAGMATIC -PHREATIC -AUTOCLASTIC -QUENCH -SYN-ERUPTIVE GRAVITATIONAL -IMPACT -HYDRODYNAMIC MINGLING -HYDROTHERMAL -TECTONIC -SEISMIC -LOADING -EPICLASTIC -DRYING -OTHER CHEMICAL CHANGE FROM WEATHERING, ALTERATION, CEMENTATION, ETC Term 4 IMPORTANT ASPECTS OF FRAGMENTATION Definition 1. SPATIAL DISTRIBUTION- in-situ vs. dispersed 2. RATE OF DISPERSAL - explosive vs. non-explosive 3. RHEOLOGY - ductile vs. brittle 4. TIMING OF FRAGMENTATION Term TIMING OF FRAGMENTATION (7) Definition -PRE-EXISTING -SYN-ERUPTIVE -SYN-ERUPTIVE RECYCLING -SYN-ERUPTIVE RESEDIMENTATION -POST-ERUPTIVE RESEDIMENTATION -POST-LITHIFICATION FRAGMENTATION -POST-EMPLACEMENT SYN-VOLCANIC Term McPhie's definition of pyroclasts/pyroclastic Definition components of any origin within a rock/deposit emplaced by a volcanic plume, density current or jet in any environment and the rocks/deposits are pyroclastic Term AUTOCLASTIC (FLOW) FRAGMENTATION Definition -PROCESS OF FRAGMENTATION AS A CONSEQUENCE OF FLOW OF A LAVA FLOW -SHEAR FRAGMENTATION DURING MULTIPHASE FLOW IN AIR, WATER AND DEBRIS Term QUENCH FRAGMENTATION Definition -VOLUME REDUCTION ON COOLING OF GLASS INDUCES STRESSES GREATER THAN TENSILE STREGTH OF GLASS