How to Identify Metamorphic Rocks in Thin Section & Hand Sample | GEO GIRL
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3 سال پیش
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In Metamorphic Petrology, you need
In Metamorphic Petrology, you need to identify metamorphic rocks and the metamorphic minerals those rocks are made of in both hand specimen and thin section. In this video, I show images of hand samples and real time video rotations of thin sections of the following:
- Marble (metamorphosed limestone) which has characteristic calcite with cleavage under the microscope
- Quartzite (metamorphosed sandstone) which is mainly quartz and I go over how to tell the difference between quartzite and marble in hand sample
- Phyllite (metamorphosed shale or claystone) dominated by foliated mica, and I go over the difference between phyllite vs schist
- Schist (metamorphosed shale or claystone) dominated by foliated mica, quartz, sometimes plagioclase feldspar, and sometimes has porphyroblasts or poikiloblasts of garnet or staurolite.
- Amphibolite (metamorphosed mafic basalt or gabbro) dominated by amphiboles like hornblende, and sometimes has minor plagioclase, quartz and/or garnet porphyro/poikiloblasts.
- Eclogite (metamorphosed basalt) dominated by garnet in a matrix of pyroxenes, can sometime have minor quartz and/or amphiboles.
- Granular, Streifen, & Augen Gneiss (metamorphosed granite) coarse grained, containing mainly quartz, feldspar, & mica.
- Serpentinite (hydrothermally metamorphosed ultramafic rock/altered olivine) containing meshy, snake-like serpentine.
- Slate (metamorphosed shale or claystone) containing illite, graphite, minor quartz and mica.
- Soapstone or Talc Schist (metamorphosed ultramafic rock) dominated by soft, scratchable talc.
References: Essentials of Igneous & Metamorphic Petrology by Ronald and Carol Frost: https://amzn.to/37Zs9AL
Thin Section Rotation Website: https://www.virtualmicroscope.org/col... (just pick a collection, pick a rock sample, and it will show you hand sample pictures, thin sections, and tell you the mineral assemblage)
Thin Section Atlas Book (in color): https://amzn.to/3HYsrrj
Online Metamorphic Mineral Thin section Atlas: https://www.earth.ox.ac.uk/~oesis/atl...
Earth Materials by Cornelis Klein and Anthony Philpotts: https://amzn.to/3z5sCxe
GEO GIRL Website: https://www.geogirlscience.com/ (visit my website to see all my courses, shop merch, learn more about me, and donate to support the channel if you'd like!)
0:00 Marble
2:36 Quartzite
4:16 How to tell the difference between Quartzite and Marble
5:28 Real time rotation of Quartzite thin section!
7:01 Phyllite
8:31 Phyllite vs Schist
9:43 Garnet Staurolite Schist
11:23 Poikiloblasts vs Porphyroblasts
11:55 More Schist examples
14:31Real time rotation of Schist thin section!
15:53 Blueschists (Glaucophane Schist)
16:45 Real time rotation of Blueschist thin section!
18:31 Amphibolite
19:34 Real time rotation of Amphibolite thin section!
21:09 Garnet Amphibolite
22:14 Mica Schists
23:45 Eclogite
25:39 Gneiss (Granular, Streifen, & Augen)
26:48 Real time rotation of Gneiss thin section!
28:34 Poikiloblastic schists (secondary metamorphism)
30:50 Serpentinite
31:31 Greenschist
33:08 Slate
34:12 Soapstone (Talc Schist)
35:12 Upcoming videos & references!
Directly offset your carbon footprint with Wren: https://shrsl.com/3d0t2
(Just click link, press get started, take the free C footprint quiz, then choose how much you want to reduce your footprint by donating to the C sequestration projects they're funding!)
Non-textbook books I recommend:
Oxygen by D. Canfield: https://amzn.to/3gffbCL
Brief history of Earth by A. Knoll: https://amzn.to/3w3hC1I
Life on young planet by A. Knoll: https://amzn.to/2RBMpny
Some assembly required by N. Shubin: https://amzn.to/3w1Ezm2
Your inner fish by N. Shubin: https://amzn.to/3cpw3Wb
Oxygen by N. Lane: https://amzn.to/3z4FgwZ
Alien Oceans by K. Hand: https://amzn.to/3clMx1l
Life's Engines: https://amzn.to/3w1Nhke
Tools I use as a geologist/teacher/student:
Geology field notebook: https://amzn.to/3lb6dJf
Geology rock hammer: https://amzn.to/3DZw8MA
Geological compass: https://amzn.to/3hfbdLu
Geological hand lens: https://amzn.to/3jXysM5
Camera: https://amzn.to/3l6fGRT
Carbon-neutral pencil bag: https://shrsl.com/3cvjv
Carbon-neutral backpack: https://shrsl.com/3cvkc
Disclaimer: Links included in this description might be affiliate links. If you purchase a product or service with the links that I provide I may receive a small commission, but there is no additional charge to you! Thank you for supporting my channel so I can continue to provide you with free content each week! And as always, let me know your topic suggestions in the comments down below!
- Marble (metamorphosed limestone) which has characteristic calcite with cleavage under the microscope
- Quartzite (metamorphosed sandstone) which is mainly quartz and I go over how to tell the difference between quartzite and marble in hand sample
- Phyllite (metamorphosed shale or claystone) dominated by foliated mica, and I go over the difference between phyllite vs schist
- Schist (metamorphosed shale or claystone) dominated by foliated mica, quartz, sometimes plagioclase feldspar, and sometimes has porphyroblasts or poikiloblasts of garnet or staurolite.
- Amphibolite (metamorphosed mafic basalt or gabbro) dominated by amphiboles like hornblende, and sometimes has minor plagioclase, quartz and/or garnet porphyro/poikiloblasts.
- Eclogite (metamorphosed basalt) dominated by garnet in a matrix of pyroxenes, can sometime have minor quartz and/or amphiboles.
- Granular, Streifen, & Augen Gneiss (metamorphosed granite) coarse grained, containing mainly quartz, feldspar, & mica.
- Serpentinite (hydrothermally metamorphosed ultramafic rock/altered olivine) containing meshy, snake-like serpentine.
- Slate (metamorphosed shale or claystone) containing illite, graphite, minor quartz and mica.
- Soapstone or Talc Schist (metamorphosed ultramafic rock) dominated by soft, scratchable talc.
References: Essentials of Igneous & Metamorphic Petrology by Ronald and Carol Frost: https://amzn.to/37Zs9AL
Thin Section Rotation Website: https://www.virtualmicroscope.org/col... (just pick a collection, pick a rock sample, and it will show you hand sample pictures, thin sections, and tell you the mineral assemblage)
Thin Section Atlas Book (in color): https://amzn.to/3HYsrrj
Online Metamorphic Mineral Thin section Atlas: https://www.earth.ox.ac.uk/~oesis/atl...
Earth Materials by Cornelis Klein and Anthony Philpotts: https://amzn.to/3z5sCxe
GEO GIRL Website: https://www.geogirlscience.com/ (visit my website to see all my courses, shop merch, learn more about me, and donate to support the channel if you'd like!)
0:00 Marble
2:36 Quartzite
4:16 How to tell the difference between Quartzite and Marble
5:28 Real time rotation of Quartzite thin section!
7:01 Phyllite
8:31 Phyllite vs Schist
9:43 Garnet Staurolite Schist
11:23 Poikiloblasts vs Porphyroblasts
11:55 More Schist examples
14:31Real time rotation of Schist thin section!
15:53 Blueschists (Glaucophane Schist)
16:45 Real time rotation of Blueschist thin section!
18:31 Amphibolite
19:34 Real time rotation of Amphibolite thin section!
21:09 Garnet Amphibolite
22:14 Mica Schists
23:45 Eclogite
25:39 Gneiss (Granular, Streifen, & Augen)
26:48 Real time rotation of Gneiss thin section!
28:34 Poikiloblastic schists (secondary metamorphism)
30:50 Serpentinite
31:31 Greenschist
33:08 Slate
34:12 Soapstone (Talc Schist)
35:12 Upcoming videos & references!
Directly offset your carbon footprint with Wren: https://shrsl.com/3d0t2
(Just click link, press get started, take the free C footprint quiz, then choose how much you want to reduce your footprint by donating to the C sequestration projects they're funding!)
Non-textbook books I recommend:
Oxygen by D. Canfield: https://amzn.to/3gffbCL
Brief history of Earth by A. Knoll: https://amzn.to/3w3hC1I
Life on young planet by A. Knoll: https://amzn.to/2RBMpny
Some assembly required by N. Shubin: https://amzn.to/3w1Ezm2
Your inner fish by N. Shubin: https://amzn.to/3cpw3Wb
Oxygen by N. Lane: https://amzn.to/3z4FgwZ
Alien Oceans by K. Hand: https://amzn.to/3clMx1l
Life's Engines: https://amzn.to/3w1Nhke
Tools I use as a geologist/teacher/student:
Geology field notebook: https://amzn.to/3lb6dJf
Geology rock hammer: https://amzn.to/3DZw8MA
Geological compass: https://amzn.to/3hfbdLu
Geological hand lens: https://amzn.to/3jXysM5
Camera: https://amzn.to/3l6fGRT
Carbon-neutral pencil bag: https://shrsl.com/3cvjv
Carbon-neutral backpack: https://shrsl.com/3cvkc
Disclaimer: Links included in this description might be affiliate links. If you purchase a product or service with the links that I provide I may receive a small commission, but there is no additional charge to you! Thank you for supporting my channel so I can continue to provide you with free content each week! And as always, let me know your topic suggestions in the comments down below!
3 سال پیش
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