Igneous Intrusion Eric Angat Teacher.

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Presentation transcript:

Igneous Intrusion Eric Angat Teacher

Felsic Igneous rock Mafic Extrusive igneous rock Small crystals Big crystals Intrusive igneous rock (pluton)

Extrusive igneous rock-surface Fine/smallcrystals Extrusive igneous rock-surface Intrusive igneous rock (pluton)-underground Coarse/Big crystals

Figure A: Intrusion through country rock. Figure B: Diapir Figure C: Assimilation

Magma rises from the Asthenosphere ( diapir) Figure A: Intrusion through country rock. or forms a volcano, if it comes out of the surface. Forms dike ( vertical) Stopped by hard rock layer Forms sill (horizontal) Magma rises from the Asthenosphere ( diapir) Sedimentary rock layers ( country rock).

Magma rises from the lower mantle or Asthenosphere Figure B: Diapir Pushes the rocks upward forming an Anticline -upward curved layered rock Magma rises from the lower mantle or Asthenosphere

Figure C: Assimilation Sedimentary rock layers ( country rock). Cooled magma Assimilation Rocks not completely melted Xenolith Assimilated rock For size comparison Magma rises

Volcano-forms when magma reaches the surface Lacolith- dome shaped rock. Forms sill (horizontal) Magma that hardens underground is called pluton ( batholith sill, dike, laccolith). Granite is the most common pluton. Forms dike ( vertical) Batholith-massive rock formed from cooled magma

Near the surface, the pressure of compaction form sedimentary rocks The WEIGHT of the atmosphere, hydrosphere, and crust pressures materials down. HEAT & PRESSURE form metamorphic rocks. HEAT from the core causes materials to rise. If parent rocks melt, an igneous rock is formed.

Arrange the sequence of events, from oldest to youngest. erosion of sandstone faulting of rock layer. Deposition sedimentary rock layers. Limestone- sandstone- shale. Intrusion of Magma. uplifting of land

Oldest: Deposition sedimentary rock layers. Weathered sandstone. Oldest: Deposition sedimentary rock layers. fault limestone sandstone shale Next: faulting of rock layer. shale sandstone Next: Intrusion of Magma. limestone http://www.regentsprep.org/Regents/earthsci/intpgeohist.htm Next: uplifting of land Youngest: erosion of sandstone

Answer the questions on your activity paper. http://www.youtube.com/watch?v=A5LdZJiKsVk

Figure A: Intrusion through country rock. Or forms a volcano, if it comes out of the surface. Forms dike ( vertical) Forms sill (horizontal) Sedimentary rock layers ( country rock). Magma rises Figure B: Diapir Figure C: Assimilation Forms Anticline -curved layered rock Magma eats up the rock. Forming xenolith Magma rises

Which sequence of events, from oldest to youngest, has occurred in this outcrop? A.sedimentary layers → igneous intrusion → folding → faulting B.igneous intrusion → sedimentary layers → folding → faulting C.igneous intrusion → faulting → sedimentary layers → folding D.sedimentary layers → folding → igneous intrusion → faulting Law of superposition: layers are deposited horizontally. this means Sedimentary layers were first, then the folding occured, because the igneous intrusion did not fold with the sedimentary layers, then the fault comes, becuase the igneous intrusion and layers were all shifted up.