Podcast
Questions and Answers
What primary role does the biosphere play in the transformation of fresh rock into regolith?
What primary role does the biosphere play in the transformation of fresh rock into regolith?
- It shields rocks from the effects of the hydrosphere and atmosphere.
- It contributes to tectonic uplift, exposing new rock surfaces.
- It facilitates the breakdown of rocks through the actions of living organisms and organic acids. (correct)
- It directly melts exposed rocks through geothermal activity.
How does the chemical weathering process primarily affect the stability of minerals found in igneous and metamorphic rocks when they are exposed at Earth's surface?
How does the chemical weathering process primarily affect the stability of minerals found in igneous and metamorphic rocks when they are exposed at Earth's surface?
- It causes them to become more resistant to surface conditions by increasing their hardness.
- It chemically alters them into new, more stable minerals that are in equilibrium with surface conditions. (correct)
- It instantaneously transforms them into more stable minerals through intense heat and pressure.
- It encases them in protective layers that prevent further degradation.
Under what specific conditions does pressure reduction lead to the disintegration of rocks, contributing to the formation of regolith?
Under what specific conditions does pressure reduction lead to the disintegration of rocks, contributing to the formation of regolith?
- When the overlying material is removed by erosion, decreasing the pressure on the rock and causing it to expand and fracture. (correct)
- When rocks are rapidly cooled, causing them to contract and develop surface cracks.
- When rocks are deeply buried and subjected to extreme confining pressures from overlying strata.
- When tectonic forces compress rocks, leading to internal stresses and eventual breakage.
How does the process of frost wedging contribute to the physical weathering of rocks?
How does the process of frost wedging contribute to the physical weathering of rocks?
In what specific way does physical weathering enhance the effects of chemical weathering on rocks?
In what specific way does physical weathering enhance the effects of chemical weathering on rocks?
What is the underlying mechanism by which weak carbonic acid facilitates chemical weathering?
What is the underlying mechanism by which weak carbonic acid facilitates chemical weathering?
How does the removal of potassium ions (K+) from a feldspar crystal during chemical weathering influence the crystal's structure and composition?
How does the removal of potassium ions (K+) from a feldspar crystal during chemical weathering influence the crystal's structure and composition?
What critical distinction differentiates sediment from regolith, based on their role in Earth's surface processes?
What critical distinction differentiates sediment from regolith, based on their role in Earth's surface processes?
What is the most significant implication of the continuous removal of weathered particles by agents like water, wind, and ice?
What is the most significant implication of the continuous removal of weathered particles by agents like water, wind, and ice?
What characteristic fundamentally distinguishes clastic sediments from chemical sediments?
What characteristic fundamentally distinguishes clastic sediments from chemical sediments?
How does the presence of calcium carbonate shells in sediments indicate a biochemical origin?
How does the presence of calcium carbonate shells in sediments indicate a biochemical origin?
What is the crucial role of compression and time in the lithification process that transforms sediment into sedimentary rock?
What is the crucial role of compression and time in the lithification process that transforms sediment into sedimentary rock?
How are the textures and compositions of conglomerate and sandstone fundamentally different, relating to their formation environments?
How are the textures and compositions of conglomerate and sandstone fundamentally different, relating to their formation environments?
What key feature distinguishes shale or mudstone from siltstone in terms of particle size and depositional environment?
What key feature distinguishes shale or mudstone from siltstone in terms of particle size and depositional environment?
How does the concept of the rock cycle relate to the interaction between the geosphere, hydrosphere, atmosphere, and biosphere?
How does the concept of the rock cycle relate to the interaction between the geosphere, hydrosphere, atmosphere, and biosphere?
What is the most significant consequence of diagenesis on sediments undergoing lithification?
What is the most significant consequence of diagenesis on sediments undergoing lithification?
How does the process of recrystallization contribute to the lithification of sediment?
How does the process of recrystallization contribute to the lithification of sediment?
Why is the presence of fossils considered a significant indicator of sedimentary rock origin?
Why is the presence of fossils considered a significant indicator of sedimentary rock origin?
How does the sorting of sediments influence the characteristics of the resulting sedimentary rock?
How does the sorting of sediments influence the characteristics of the resulting sedimentary rock?
How does the process of compaction facilitate lithification?
How does the process of compaction facilitate lithification?
Where would you most likely find locations of clastic sediment deposits?
Where would you most likely find locations of clastic sediment deposits?
According to the course material, what primary factor dictates the downslope movement of rock and the flow of fluids during mass wasting events?
According to the course material, what primary factor dictates the downslope movement of rock and the flow of fluids during mass wasting events?
What role does cementation play in the transformation of sediment into sedimentary rock?
What role does cementation play in the transformation of sediment into sedimentary rock?
How do earthquakes contribute to mass wasting?
How do earthquakes contribute to mass wasting?
In the context of sediment transport, what distinguishes 'saltation' from 'surface creep'?
In the context of sediment transport, what distinguishes 'saltation' from 'surface creep'?
How do volcanic eruptions instigate mass wasting events?
How do volcanic eruptions instigate mass wasting events?
How does the relative water velocity affect the transportation of sediment within a stream?
How does the relative water velocity affect the transportation of sediment within a stream?
During sediment transport in a stream, under what conditions are larger particles most likely to be transported as part of the bed load?
During sediment transport in a stream, under what conditions are larger particles most likely to be transported as part of the bed load?
How does long-term suspension differ from short-term suspension in sediment transport?
How does long-term suspension differ from short-term suspension in sediment transport?
What is 'bedding' in sedimentary rocks, and how does it form?
What is 'bedding' in sedimentary rocks, and how does it form?
How would the absence of water fundamentally change the process of chemical sediment formation?
How would the absence of water fundamentally change the process of chemical sediment formation?
How does the principle of original horizontality most directly influence the interpretation of geological history in regions with intensely folded strata?
How does the principle of original horizontality most directly influence the interpretation of geological history in regions with intensely folded strata?
In regions undergoing significant tectonic activity, how might the principle of stratigraphic superposition be used to determine relative ages of rock layers when faulting is present?
In regions undergoing significant tectonic activity, how might the principle of stratigraphic superposition be used to determine relative ages of rock layers when faulting is present?
How can the analysis of lateral continuity aid in predicting the extent and volume of a potential aquifer in a region with complex geological structures?
How can the analysis of lateral continuity aid in predicting the extent and volume of a potential aquifer in a region with complex geological structures?
What challenges arise in applying stratigraphic correlation to determine the age equivalence of sedimentary rocks across vast distances with few shared fossils or marker beds?
What challenges arise in applying stratigraphic correlation to determine the age equivalence of sedimentary rocks across vast distances with few shared fossils or marker beds?
Under what complex scenario might the principles of cross-cutting relationships and superposition be simultaneously applied to determine the age of a dike intrusion within a sequence of faulted sedimentary layers?
Under what complex scenario might the principles of cross-cutting relationships and superposition be simultaneously applied to determine the age of a dike intrusion within a sequence of faulted sedimentary layers?
How does the presence of an angular unconformity specifically challenge the direct application of stratigraphic superposition in determining the age sequence of rock layers?
How does the presence of an angular unconformity specifically challenge the direct application of stratigraphic superposition in determining the age sequence of rock layers?
How can one differentiate between a disconformity and a paraconformity in sedimentary rocks, and why is this distinction crucial for accurate geological interpretations?
How can one differentiate between a disconformity and a paraconformity in sedimentary rocks, and why is this distinction crucial for accurate geological interpretations?
What complex depositional and diagenetic processes influence the preservation of fossils in mudstone compared to sandstone, considering their relative porosity and permeability?
What complex depositional and diagenetic processes influence the preservation of fossils in mudstone compared to sandstone, considering their relative porosity and permeability?
How does the presence of rounded clasts in conglomerate versus angular clasts in breccia provide insights into the energy levels and transport distances of their respective depositional environments?
How does the presence of rounded clasts in conglomerate versus angular clasts in breccia provide insights into the energy levels and transport distances of their respective depositional environments?
How does the transformation of shale into slate during low-grade metamorphism illustrate changes in texture and mineral alignment under differential stress?
How does the transformation of shale into slate during low-grade metamorphism illustrate changes in texture and mineral alignment under differential stress?
What are the limitations of using color as the primary method of stratigraphic correlation across sedimentary basins with varying redox conditions and organic matter content?
What are the limitations of using color as the primary method of stratigraphic correlation across sedimentary basins with varying redox conditions and organic matter content?
How might the principle of lateral continuity be applied to predict subsurface reservoir geometries in petroleum exploration, particularly in complex deltaic environments?
How might the principle of lateral continuity be applied to predict subsurface reservoir geometries in petroleum exploration, particularly in complex deltaic environments?
How can the detailed petrographic analysis of sandstone, including its grain size, sorting, and mineral composition, be used to reconstruct the tectonic setting and weathering history of its source region?
How can the detailed petrographic analysis of sandstone, including its grain size, sorting, and mineral composition, be used to reconstruct the tectonic setting and weathering history of its source region?
How does the development of foliation in metamorphic rocks, such as the transformation of shale to schist, reflect the interplay between differential stress, mineral alignment, and metamorphic grade?
How does the development of foliation in metamorphic rocks, such as the transformation of shale to schist, reflect the interplay between differential stress, mineral alignment, and metamorphic grade?
What conditions are most conducive to metasomatism?
What conditions are most conducive to metasomatism?
What is the primary significance of differential stress in metamorphism?
What is the primary significance of differential stress in metamorphism?
What metamorphic feature results from extreme differential stress?
What metamorphic feature results from extreme differential stress?
How does confining pressure and directed stress relate to foliation?
How does confining pressure and directed stress relate to foliation?
What is a critical result of metamorphism?
What is a critical result of metamorphism?
How do changing temperature and pressure conditions primarily alter rocks?
How do changing temperature and pressure conditions primarily alter rocks?
What is the primary cause of chemical reactions and recrystallization in contact metamorphism?
What is the primary cause of chemical reactions and recrystallization in contact metamorphism?
Why does burial metamorphism occur?
Why does burial metamorphism occur?
What is responsible for the differential stress, mechanical deformation and recrystallization found in regional metamorphism?
What is responsible for the differential stress, mechanical deformation and recrystallization found in regional metamorphism?
How are metamorphic rocks classified?
How are metamorphic rocks classified?
How does plate tectonics directly influence metamorphism?
How does plate tectonics directly influence metamorphism?
What is a derivative of shale in metamorphic rock classification?
What is a derivative of shale in metamorphic rock classification?
What determines rock properties once rock is heated, even to partial melting, and becomes magma?
What determines rock properties once rock is heated, even to partial melting, and becomes magma?
What determines crystal size?
What determines crystal size?
What is mafic rock?
What is mafic rock?
What conditions during fractional crystallization would lead to the most significant changes in the composition of the remaining magma?
What conditions during fractional crystallization would lead to the most significant changes in the composition of the remaining magma?
How does the presence of existing crystal structures within a magma chamber influence the textures of newly formed igneous rocks during subsequent cooling phases?
How does the presence of existing crystal structures within a magma chamber influence the textures of newly formed igneous rocks during subsequent cooling phases?
If a section of the Earth's crust experiences both uplift and increased denudation, which factor would primarily determine whether the land surface in that area is elevated or lowered over time?
If a section of the Earth's crust experiences both uplift and increased denudation, which factor would primarily determine whether the land surface in that area is elevated or lowered over time?
How would increased rates of both uplift and denudation in a mountainous region most likely affect the sediment composition and deposition patterns in the adjacent lowlands?
How would increased rates of both uplift and denudation in a mountainous region most likely affect the sediment composition and deposition patterns in the adjacent lowlands?
How might alternating layers of welded tuff and agglomerate provide insights into the eruptive history of a volcano?
How might alternating layers of welded tuff and agglomerate provide insights into the eruptive history of a volcano?
In a region experiencing significant tectonic activity and volcanism, how are the principles of uplift, isostasy, and denudation intertwined to shape the landscape?
In a region experiencing significant tectonic activity and volcanism, how are the principles of uplift, isostasy, and denudation intertwined to shape the landscape?
How does the long-term interplay between tectonic activity and climate variability influence the formation and preservation of specific geological features?
How does the long-term interplay between tectonic activity and climate variability influence the formation and preservation of specific geological features?
What is the most significant difference between the cooling process of volcanic rock and plutonic rock?
What is the most significant difference between the cooling process of volcanic rock and plutonic rock?
When considering the cooling rates of igneous rocks, how does the Bowen's reaction series relate to the resulting mineral composition?
When considering the cooling rates of igneous rocks, how does the Bowen's reaction series relate to the resulting mineral composition?
Concerning fractional crystallization, how does the removal of early-formed crystals from a magma affect the composition of the remaining melt, and what implication does this have for the diversity of igneous rocks?
Concerning fractional crystallization, how does the removal of early-formed crystals from a magma affect the composition of the remaining melt, and what implication does this have for the diversity of igneous rocks?
Which of the following scenarios would most likely result in the formation of a porphyritic igneous rock?
Which of the following scenarios would most likely result in the formation of a porphyritic igneous rock?
How does the principle of isostasy specifically relate to the long-term erosional processes in a mountain range?
How does the principle of isostasy specifically relate to the long-term erosional processes in a mountain range?
How can pyroclastic rocks provide specific insights into the explosivity and volcanic processes of past eruptions?
How can pyroclastic rocks provide specific insights into the explosivity and volcanic processes of past eruptions?
What are the effects of the continuous and ongoing contest between internal and external forces on the Earth's surface?
What are the effects of the continuous and ongoing contest between internal and external forces on the Earth's surface?
How is the rate of denudation related to uplift rates and the overall relief of a landscape?
How is the rate of denudation related to uplift rates and the overall relief of a landscape?
Flashcards
Weathering
Weathering
Breakdown of rocks into smaller pieces by physical and chemical processes.
Regolith
Regolith
Layer of loose, unconsolidated material covering bedrock.
Mechanical weathering
Mechanical weathering
Physical disintegration of rocks into smaller fragments.
Pressure reduction
Pressure reduction
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Frost wedging
Frost wedging
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Salt wedging
Salt wedging
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Chemical Weathering
Chemical Weathering
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Carbonic acid weathering
Carbonic acid weathering
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Erosion
Erosion
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Sediment
Sediment
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Deposition
Deposition
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Clastic Sediment
Clastic Sediment
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Chemical Sediment
Chemical Sediment
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Biogenic Sediment
Biogenic Sediment
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conglomerate
conglomerate
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Mass wasting
Mass wasting
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Lithification
Lithification
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Bedding
Bedding
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Process of lithification
Process of lithification
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Compaction
Compaction
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Cementation or Recrystallization
Cementation or Recrystallization
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Diagenesis
Diagenesis
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Sorting
Sorting
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Stream Load
Stream Load
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Bed load
Bed load
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Suspended load
Suspended load
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Surface creep
Surface creep
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Saltation
Saltation
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Dissolved load
Dissolved load
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Clastic Sediment Deposition
Clastic Sediment Deposition
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Clastic Sedimentary Rock
Clastic Sedimentary Rock
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Breccia
Breccia
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Sandstone
Sandstone
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Siltstone
Siltstone
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Shale
Shale
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Mudstone
Mudstone
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Chemical Sedimentary Rock
Chemical Sedimentary Rock
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Evaporite
Evaporite
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Banded Iron Formation
Banded Iron Formation
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Limestone
Limestone
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Chert
Chert
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Original Horizontality
Original Horizontality
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Stratigraphic Superposition
Stratigraphic Superposition
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Lateral Continuity
Lateral Continuity
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Pore Fluids in Metamorphism
Pore Fluids in Metamorphism
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Metasomatism
Metasomatism
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Heat Sources for Metamorphism
Heat Sources for Metamorphism
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Stress (in Metamorphism)
Stress (in Metamorphism)
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Differential Stress
Differential Stress
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Mineral Alignment
Mineral Alignment
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New Mineral Assemblages
New Mineral Assemblages
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Metamorphic Processes
Metamorphic Processes
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Contact Metamorphism
Contact Metamorphism
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Burial Metamorphism
Burial Metamorphism
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Regional Metamorphism
Regional Metamorphism
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Rock Texture (Metamorphic)
Rock Texture (Metamorphic)
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Shale's Metamorphic Sequence
Shale's Metamorphic Sequence
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Metamorphic Facies
Metamorphic Facies
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Plate Tectonics and Metamorphism
Plate Tectonics and Metamorphism
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Volcanic rock
Volcanic rock
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Glass (Volcanic)
Glass (Volcanic)
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Pyroclastic Rock
Pyroclastic Rock
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Welded Tuff
Welded Tuff
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Agglomerate (Tephra)
Agglomerate (Tephra)
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Tuff (Tephra)
Tuff (Tephra)
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Plutonic Rock
Plutonic Rock
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Coarse Grained Texture
Coarse Grained Texture
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Pegmatite
Pegmatite
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Porphyry
Porphyry
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Fractional Crystallization
Fractional Crystallization
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Denudation
Denudation
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Drivers of Earth's Surface Changes
Drivers of Earth's Surface Changes
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Landform development
Landform development
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Landscape Timeframes
Landscape Timeframes
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Study Notes
New Rock from Old
- Metamorphic rocks undergo changes in texture, mineralogy, or both while in the solid state.
- Low-grade metamorphism occurs between 150°C–550°C and at low pressure.
- High-grade metamorphism occurs above 550°C and at high pressure.
- Other factors, including fluids, time, and stress, also play an important role in metamorphism.
- Fluids trapped in the pores between rock grains heat up during metamorphism and speed up chemical reactions.
- Abundant pore fluids involved in metamorphism is called metasomatism.
- Rock can be heated by burial, exposure to igneous intrusions, or collision.
- Each of these can be associated with different pressures, so metamorphism can rarely be due only to temperature.
- Stress implies direction and is a more useful term than pressure.
- Metamorphic rocks record differential stress in their textures.
- Differential stress is stress that is not equal in all directions.
- Differential stress commonly produces the parallel alignment of certain minerals which gives the rock a stripey pattern(gneiss) or planar fabric(foliation).
- Metamorphism also produces new mineral assemblages that are stable at the new pressure and temperature.
- The processes that result from changing temperature and pressure are either mechanical deformation or chemical recrystallization, or both.
- Different kinds of metamorphism reflect the importance of the two processes.
- Contact metamorphism occurs where magma intrudes rock; high temperatures cause chemical reactions and recrystallization.
- Burial metamorphism occurs when buried sediment attains temperatures greater than 150°C, causing recrystallization.
- Regional metamorphism involves differential stress, mechanical deformation, and recrystallization from mountain range formation.
- Classification of metamorphic rocks is based on rock texture and mineral assemblage.
- Classification primarily names the metamorphic derivatives of:
- Shale -> slate -> phyllite -> schist -> gneiss
- Basalt -> greenschist -> amphibolite -> granulite
- Limestone -> marble
- Sandstone -> quartzite
- For a given range of temperature and pressure and for a given rock composition, the assemblage of minerals formed during metamorphism is always the same, according to the concept of metamorphic facies.
- Plate tectonics explains the regional distribution of metamorphic facies and regionally metamorphosed rock.
From Rock to Magma and Back Again
- When rock is heated to the point of melting, even partial melting, it becomes magma, which will become igneous rock.
- Cooling and crystallization determine the properties of the igneous rock.
- Crystals grow in an interlocking texture.
- The rate of cooling determines crystal size.
- Rocks that contain a lot of silica are called felsic; rocks that contain little silica are called mafic.
- When magma or lava solidifies, the mineral assemblage is the same for both intrusive and extrusive rock; however, the texture is different.
- Rapid cooling creates volcanic rock.
- Volcanic rocks have a fine-grained texture because lava cools so rapidly that minerals do not have time to grow large.
- Some lava cools so rapidly that it forms glass.
- Pyroclastic rock is transitional between igneous and sedimentary rock, forming tephra.
- Fused ash forms welded tuff.
- Bomb-sized tephra is called agglomerate.
- Lapilli or ash-sized tephra is called tuff.
- Slow cooling creates plutonic rock.
- Intrusive igneous rock tends to be coarse-grained because magma within the crust cools slowly, enabling crystal growth.
- Extremely coarse-grained rock is called pegmatite.
- A mixture of large and small grains is called porphyry.
- There is a diversity of igneous rocks that arise from the three principal magma compositions.
- Fractional crystallization contributes to the diversification of igneous rocks.
- Crystallization is halted, the crystals are separated from the melt, or the melt is injected with additional magma.
The Rock Cycle, Tectonic Cycle, and Earth’s Landscapes
- The major components of the Earth system meet at the land surface.
- Constant changes to Earth’s surface reflect the ongoing competition between internal forces that raise the lithosphere and external forces that wear it down.
- Uplift, isostasy, and volcanism are driven by Earth’s internal heat energy.
- Gravity and the Sun’s energy drive denudation, i.e. the destructive effects of weathering, erosion, and mass wasting.
- The progressive sculpting of the land into varied relief is the net result.
- Uplift and denudation rates both vary over time.
- Landform development in any given location is controlled by process, climate, lithology, relief, and time.
- Major landscape features of Earth have developed over long time intervals.
- Change may be started by a tectonic event, a large sea level change, or a shift in climate.
- Landscapes never achieve a state of equilibrium; Earth's surface has always been dynamic.
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