1 / 18

SEDIMENTARY ROCKS

SEDIMENTARY ROCKS. CARBONATES. SEDIMENTARY ROCKS. Texture, structure and composition. Form sheet for sedimentary rocks:. I Color II Texture gr. size, sorting, roundness III Structure IV Allochemical constituents V Orthochemical constituents VI Name. SEDIMENTARY ROCKS.

brie
Download Presentation

SEDIMENTARY ROCKS

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. SEDIMENTARY ROCKS CARBONATES

  2. SEDIMENTARY ROCKS Texture, structure and composition Form sheet for sedimentary rocks: I Color II Texture gr. size, sorting, roundness III Structure IV Allochemical constituents V Orthochemical constituents VI Name

  3. SEDIMENTARY ROCKS Texture, structure and composition Form sheet for sedimentary rocks: I Color - little value II Texture gr. size, sorting, roundness III Structure IV Allochemical constituents V Orthochemical constituents VI Name

  4. SEDIMENTARY ROCKS Texture, structure and composition Form sheet for sedimentary rocks: I Color II Texture III Structure IV Allochemical constituents V Orthochemical constituents VI Name

  5. SEDIMENTARY ROCKS Texture, structure and composition Form sheet for sedimentary rocks: II Texture gr. size: allochems treated like clasts; orthochems like igneous rx sorting & roundess: fairly meaningless packing: very important (see classification below)

  6. SEDIMENTARY ROCKS Texture, structure and composition Form sheet for sedimentary rocks: I Color II Texture gr. size, sorting, roundness III Structure IV Allochemical constituents V Orthochemical constituents VI Name

  7. SEDIMENTARY ROCKS Texture, structure and composition Form sheet for sedimentary rocks: III Structure mostly growth structures: stromatolites, mounds and reefs also dunes, ripples, x-bedding

  8. SEDIMENTARY ROCKS Texture, structure and composition Form sheet for sedimentary rocks: I Color II Texture gr. size, sorting, roundness III Structure IV Allochemical constituents V Orthochemical constituents VI Name

  9. SEDIMENTARY ROCKS Texture, structure and composition Form sheet for sedimentary rocks: IV Allochemical constituents fossils peloids ooids limeclasts V Orthochemical constituents microxtalline calcite (micrite) – clay to silt-size = MUD; originates as disarticulated algal material coarsely xtalline calcite (sparry calcite or sparite)

  10. SEDIMENTARY ROCKS Texture, structure and composition Form sheet for sedimentary rocks: Terrigenous detritus (5% average): chert quartz, clays minerals

  11. SEDIMENTARY ROCKS Texture, structure and composition Authigenic: Chert – 2 origins detrital (minor) intrabasinal – xtallization of amorphous silica from SiO2 shells a) sponges (Cambrian – present) b) radiolaria (Ordovician – present) c) diatoms (Jurassic – present)* *most abundant now

  12. SEDIMENTARY ROCKS Texture, structure and composition Form sheet for sedimentary rocks: I Color II Texture gr. size, sorting, roundness III Structure IV Allochemical constituents V Orthochemical constituents VI Name

  13. SEDIMENTARY ROCKS Carbonate Classifications Dunham’s classification Grain supported Original components not bound together during depostion Original components bound together during deposition Lacks mud, grain-supported Contains mud Mud supported < 10% grains > 10% grains Mudstone Packstone Wackestone Grainstone Boundstone

  14. SEDIMENTARY ROCKS Carbonate Classifications Dunham’s classification Grain supported Original components not bound together during depostion Original components bound together during deposition Lacks mud, grain-supported Contains mud Mud supported < 10% grains > 10% grains Mudstone Packstone Wackestone Grainstone Boundstone

  15. SEDIMENTARY ROCKS Carbonate Classifications Dunham’s classification Grain supported Original components not bound together during depostion Original components bound together during deposition Lacks mud, grain-supported Contains mud Mud supported < 10% grains > 10% grains Mudstone Packstone Wackestone Grainstone Boundstone

  16. SEDIMENTARY ROCKS Carbonate Classifications Dunham’s classification Grain supported Original components not bound together during depostion Original components bound together during deposition Lacks mud, grain-supported Contains mud Mud supported < 10% grains > 10% grains Mudstone Packstone Wackestone Grainstone Boundstone

  17. SEDIMENTARY ROCKS Carbonate Classifications Dunham’s classification Grain supported Original components not bound together during depostion Original components bound together during deposition Lacks mud, grain-supported Contains mud Mud supported < 10% grains > 10% grains Mudstone Packstone Wackestone Grainstone Boundstone

  18. SEDIMENTARY ROCKS Carbonate Classifications Folk’s: Allochemical rocks Orthochemical rocks Reef rocks allochems cement sparry calcite micrite Intraclasts intrasparite intramicrite sparite biolithite Ooids oosparite oomicrite Fossils biosparite biomicrite Pellets pelsparite pelmicrite

More Related