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Metamorphic rocks
DATHAN C S
Formation
Primary/secondary rocks
Earth,s movement/ High
temp and pressure
Partially/ wholly
reconstituted/altered
Metamor...
Kinds of Metamorphism
1) Thermal metamorphism (Contact metamorphism)
• Heat is dominant factor due to
– Increase in depth
...
A contact metamorphic rock made of
interlayered calcite and serpentine from the
Precambrian age
2) Dynamo thermal metamorphism
(Regional metamorphism)
•Combination of Heat and pressure
•More or less complete re-crystal...
Mississippian marble in Big Cottonwood
Canyon, Wasatch Mountains, Utah
Classification based on texture and structure of
minerals
1. Foliated (Parellal structure)
Rocks that contain mica and fer...
Important metamorphic rocks
1. Gneiss
Typical folded strata in gneiss. Gneiss is a metamorphic rock,
formed at high temps ...
This sample, classified as gneiss, was identified
as having come from Wyoming, from the
North Laramie Mountains. One part ...
This sample of gneiss rock shows layering of two
different kinds of rock, leading to its classification as
a metamorphic r...
2. Schist
An intermediate- to high-grade, foliated metamorphic rock. It is
highly variable in appearance, depending on the...
3. Slate
Slate is a fine-grained, foliated metamorphic rock that is created
by the alteration of shale or mudstone by low-...
4. Quartzite
Hard, non-foliated metamorphic rock which was originally pure
quartz sandstone. Sandstone is converted
into q...
5. Marble
A non foliated crystalline rock, composed of calcite and
dolomite
Pre-existing rocks and their equivalent metamorphosed
rocks
Conglomerate
(Sedimentary rock)
Gneiss
Pre-existing rocks and their equivalent metamorphosed
rocks
Basalt
(Igneous rock)
Schists
Sand stone
(sedimentary rock)
Quartz-schist
Quartzite
Quartzite
Clayey Sandstone
(sedimentary rock)
Mica-schist
slate
Shale
Mica-schist
Phyllite
(sedimentary rock)
iron ores Haematite-- schist
Gabbro
Gabbro
(Igneous rock)
Gneiss
Cholrite schist
Coal Graphite
Metamorphic rock textures
• There are five basic metamorphic textures with typical rock types
Basic rock
texture
Metamorph...
Some examples…..
Rocks metamorphosed at the deepest levels of the Earth's crust are brought
up to the surface when mountai...
Metamorphic rocks can be formed from any type of older material.
Here, the lighter brown rocks in the upper part of the cl...
Here in the Austrian Alps, the mountains in this view are built of granites,
gneisses and schists formed in the Carbonifer...
Huge thicknesses of sandstone, siltstone and mudstone, deposited in ocean
basins, are folded, squeezed and metamorphosed i...
This photograph shows the streaky banded texture typical of many
gneisses. The light streaks are feldspar and quartz, the ...
Pure marble is often white, but the presence of other mineral impurities gives
coloured varieties. These marbles have band...
Metamorphism causes new minerals to grow in a rock that was
originally formed as a sediment. Here you can see rounded red
...
This is a metamorphosed basic igneous rock in which you can see large
red garnet crystals, outlined by a rim of pale felds...
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Metamorphic rocks ppt

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Metamorphic rocks-formation,classification, type, distribution

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  • DOWNLOAD FULL BOOKS, INTO AVAILABLE FORMAT ......................................................................................................................... ......................................................................................................................... 1.DOWNLOAD FULL. PDF EBOOK here { https://tinyurl.com/y8nn3gmc } ......................................................................................................................... 1.DOWNLOAD FULL. EPUB Ebook here { https://tinyurl.com/y8nn3gmc } ......................................................................................................................... 1.DOWNLOAD FULL. doc Ebook here { https://tinyurl.com/y8nn3gmc } ......................................................................................................................... 1.DOWNLOAD FULL. PDF EBOOK here { https://tinyurl.com/y8nn3gmc } ......................................................................................................................... 1.DOWNLOAD FULL. EPUB Ebook here { https://tinyurl.com/y8nn3gmc } ......................................................................................................................... 1.DOWNLOAD FULL. doc Ebook here { https://tinyurl.com/y8nn3gmc } ......................................................................................................................... ......................................................................................................................... ......................................................................................................................... .............. Browse by Genre Available eBooks ......................................................................................................................... Art, Biography, Business, Chick Lit, Children's, Christian, Classics, Comics, Contemporary, Cookbooks, Crime, Ebooks, Fantasy, Fiction, Graphic Novels, Historical Fiction, History, Horror, Humor And Comedy, Manga, Memoir, Music, Mystery, Non Fiction, Paranormal, Philosophy, Poetry, Psychology, Religion, Romance, Science, Science Fiction, Self Help, Suspense, Spirituality, Sports, Thriller, Travel, Young Adult,
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Metamorphic rocks ppt

  1. 1. Metamorphic rocks DATHAN C S
  2. 2. Formation Primary/secondary rocks Earth,s movement/ High temp and pressure Partially/ wholly reconstituted/altered Metamorphic rocks
  3. 3. Kinds of Metamorphism 1) Thermal metamorphism (Contact metamorphism) • Heat is dominant factor due to – Increase in depth – Intrusion of magma
  4. 4. A contact metamorphic rock made of interlayered calcite and serpentine from the Precambrian age
  5. 5. 2) Dynamo thermal metamorphism (Regional metamorphism) •Combination of Heat and pressure •More or less complete re-crystallization with new structures
  6. 6. Mississippian marble in Big Cottonwood Canyon, Wasatch Mountains, Utah
  7. 7. Classification based on texture and structure of minerals 1. Foliated (Parellal structure) Rocks that contain mica and ferro magnesium minerals. Minerals flattened and arranged in parellal layers. Ex:- Gneiss, Schist, Slate 2. Non foliated (Massive structure) Rocks that contain Quartz and feldspars. Ex:- Anthracite, talc-schist 3. Granular Rocks comprising mostly of equi-dimentional grains Ex:- Quartzite, marble
  8. 8. Important metamorphic rocks 1. Gneiss Typical folded strata in gneiss. Gneiss is a metamorphic rock, formed at high temps and pressures deep within earth’s crust. The high pressure produce the folds in the banding seen here. The lighter colored layers are formed by Quartz and feldspar and muscovite, biotite and hornblende are commonly abundant in the darker bands.
  9. 9. This sample, classified as gneiss, was identified as having come from Wyoming, from the North Laramie Mountains. One part of it was associated with an age of 2.6 billion years, and another part as 1.8 billion years.
  10. 10. This sample of gneiss rock shows layering of two different kinds of rock, leading to its classification as a metamorphic rock. The layering also shows bending, suggesting that it has been subject to pressures. This rock was included in a display of geologic ages at the Smithsonian Museum of Natural History. The suggested age was 2 billion years
  11. 11. 2. Schist An intermediate- to high-grade, foliated metamorphic rock. It is highly variable in appearance, depending on the mineral content, which is a function of the precursor rock and specific temperature- pressure conditions. Schists typically have medium- to large-sized crystals, unlike the microcrystalline nature of slate & phyllite. Graphite schist Muscovite schist Biotite schist Garnet schist Cholrite schist Talc schist
  12. 12. 3. Slate Slate is a fine-grained, foliated metamorphic rock that is created by the alteration of shale or mudstone by low-grade regional metamorphism. It is popular for a wide variety of uses such as roofing, flooring and flagging because of its durability and attractive appearance.
  13. 13. 4. Quartzite Hard, non-foliated metamorphic rock which was originally pure quartz sandstone. Sandstone is converted into quartzite through heating and pressure usually related to tectonic compression
  14. 14. 5. Marble A non foliated crystalline rock, composed of calcite and dolomite
  15. 15. Pre-existing rocks and their equivalent metamorphosed rocks Conglomerate (Sedimentary rock) Gneiss
  16. 16. Pre-existing rocks and their equivalent metamorphosed rocks Basalt (Igneous rock) Schists
  17. 17. Sand stone (sedimentary rock) Quartz-schist Quartzite
  18. 18. Quartzite Clayey Sandstone (sedimentary rock) Mica-schist
  19. 19. slate Shale Mica-schist Phyllite (sedimentary rock)
  20. 20. iron ores Haematite-- schist
  21. 21. Gabbro Gabbro (Igneous rock) Gneiss Cholrite schist
  22. 22. Coal Graphite
  23. 23. Metamorphic rock textures • There are five basic metamorphic textures with typical rock types Basic rock texture Metamorphic rocks Name of foliation Slaty Slate and phyllite; slaty cleavage schistose schist schistosity gneissose gneiss gneissosity granoblastic marbles and quartzite ---- hornfelsic hornfels and skarn ----
  24. 24. Some examples….. Rocks metamorphosed at the deepest levels of the Earth's crust are brought up to the surface when mountain ranges are uplifted and eroded. The banded rocks in the cliffs beyond the mountain hut were originally lavas and sediments formed in the sea.
  25. 25. Metamorphic rocks can be formed from any type of older material. Here, the lighter brown rocks in the upper part of the cliff are calcareous schists formed from impure limestones, and the dark rocks below are mainly metamorphosed basalts. As Sifah, Oman.
  26. 26. Here in the Austrian Alps, the mountains in this view are built of granites, gneisses and schists formed in the Carboniferous and Permian periods, then metamorphosed again in the Tertiary period when the Alps were formed, and finally uplifted to the surface over the past 20 to 30 million years.
  27. 27. Huge thicknesses of sandstone, siltstone and mudstone, deposited in ocean basins, are folded, squeezed and metamorphosed into schists when continents collide. Now exposed in the Kuiseb Canyon, Namib Desert Park, Namibia.
  28. 28. This photograph shows the streaky banded texture typical of many gneisses. The light streaks are feldspar and quartz, the dark bands are mica and hornblende. Namaqualand, South Africa.
  29. 29. Pure marble is often white, but the presence of other mineral impurities gives coloured varieties. These marbles have bands and veins coloured yellow-green and grey-black by serpentine, mica and iron oxide. In this quarry the marble was being cut into large slabs for ornamental use. Ledmore, Assynt, NW Scotland.
  30. 30. Metamorphism causes new minerals to grow in a rock that was originally formed as a sediment. Here you can see rounded red garnet and a bladed grey mineral (kyanite) set in dark mica. Namaqualand, South Africa.
  31. 31. This is a metamorphosed basic igneous rock in which you can see large red garnet crystals, outlined by a rim of pale feldspar, set in dark pyroxene. Scourie, Sutherland, NW Scotland.
  32. 32. Thank you

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