23901079
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Flashcards by Dayyaan Malik, updated more than 1 year ago
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| Question | Answer |
| What rock group does F belong to and how can you tell? | Sedimentary: - contains fossils / is bioclastic - cement only occurs in sedimentary rocks |
| What rock group does E belong to and how can you tell? | Igneous: - contains plagioclase phenocrysts - porphyritic texture - interlocking crystals - no cement |
| Identify this rock and use it characteristics to explain the environment in which it was deposited. | Greywacke: - Deep sea turbidites due to angular, poorly sorted grains. - Rock fragments held in a matrix |
| Identify this rock and use it characteristics to identify its environment of deposition. | Desert Sandstone: - Iron oxide cement forms in oxidising desert conditions. - Well sorted as wind only picks up sediment of one size. - Rounded due to abrasion. - All quartz grains suggesting long period of weathering. |
| Describe the rock and index minerals found in area 1. | Hornfels: - Contains silliminite / andalusite - Rock is crystalline / granoblastic - Coarse crystal size |
| Describe the rock and index minerals found in area 2. | Adalusite slate: - Contains porphyroblasts of andalusite - Medium crystal size |
| Describe the rock and index minerals found in area 3. | Spotted rock: - Contains chlorite, biotite, muscovite - Fine crystal size - Contains spots of recrystallised minerals |
| What rock is this? -Coarse grained crystalline texture. - Quartz is prominent - Contains K feldspar and some mica | Granite |
| What rock is this? - Fragmental texture - Fine grained - Layering is visible | Shale |
| What rock is this? - Coarse grained crystalline texture - Quartz is prominent - Mainly plagioclase feldspar - some mafic minerals | Granodiorite |
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