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
|
Definition
| -VOLUME REDUCTION ON COOLING OF GLASS INDUCES STRESSES GREATER THAN TENSILE STREGTH OF GLASS |
|
|
