Sedimentary rocks
description
Transcript of Sedimentary rocks
![Page 1: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/1.jpg)
Sedimentary rocks
Formed in seas and lakes
![Page 2: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/2.jpg)
Formation
Rock materials Derived from weathering and erosion Are transported by river / wind And later deposited (sedimentation) Under the pressure of the overlying
sediment These materials are hardened into solid rock
![Page 3: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/3.jpg)
Characteristics of sedimentary rocks Non-crystalline Stratified (layered) Bedding planes between rock strata May contain fossil
![Page 4: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/4.jpg)
Conglomerate
![Page 5: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/5.jpg)
Characteristics
Rock containing rounded pebbles they are cemented by fine groundmass It is more resistant Their outcrop across stream beds may
produce waterfalls and rapids
![Page 6: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/6.jpg)
Breccia
![Page 7: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/7.jpg)
Characteristics
The rock contains angular fragments
![Page 8: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/8.jpg)
Breccia – Ap Chau
![Page 9: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/9.jpg)
Folding in sedimentary rocks
![Page 10: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/10.jpg)
![Page 11: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/11.jpg)
Ammonite fossil
![Page 12: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/12.jpg)
Sandstone
![Page 13: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/13.jpg)
Sandstone
![Page 14: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/14.jpg)
Characteristics
Sand grains are cemented Deposited farther away from the coast Less resistant than conglomerate and brecci
a
![Page 15: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/15.jpg)
Siltstone
![Page 16: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/16.jpg)
Stratification in shale e.g.Tung Ping Chau
![Page 17: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/17.jpg)
Siltstone layer being eroded to form a sea arch, Tai O.
![Page 18: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/18.jpg)
Characteristics
Very fine sediment of silt and mud is deposited and cemented together on sea floor far away from coast
Made up of numerous thin layers (stratified structure)
It is not resistant to weathering and erosion
![Page 19: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/19.jpg)
Cross-bedding in siltstone
![Page 20: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/20.jpg)
Faulting in siltstone
![Page 21: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/21.jpg)
Igneous rocks - Volcanic rocks
Ash, pyroclasts and lava flows
![Page 22: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/22.jpg)
Flowlines in rhyolite
![Page 23: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/23.jpg)
Columnar jointing due to cooling of lava - rhyolite
![Page 24: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/24.jpg)
![Page 25: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/25.jpg)
Coarse tuff
![Page 26: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/26.jpg)
Characteristics
Ash and pyroclastic materials ejected during volcanic eruption
Presence of volcanic bombs
![Page 27: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/27.jpg)
Volcanic bombs
![Page 28: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/28.jpg)
Igneous rocks - Hypabyssal rocks
In sills and dykes
![Page 29: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/29.jpg)
Dolerite dyke
![Page 30: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/30.jpg)
Dolerite
![Page 31: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/31.jpg)
Feldspar porphyry
![Page 32: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/32.jpg)
![Page 33: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/33.jpg)
Igneous rocks
In batholith
![Page 34: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/34.jpg)
3 sets of joints in granite
![Page 35: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/35.jpg)
Granite
![Page 36: Sedimentary rocks](https://reader036.fdocuments.us/reader036/viewer/2022062500/56815058550346895dbe5811/html5/thumbnails/36.jpg)
Badland landscape