Carbonate sedimentary rocks, primarily limestone and dolostone , represent roughly 20-25% of the sedimentary rock record. Unlike siliciclastic rocks derived from land erosion, carbonates are "born" in situ through biological and chemical processes, often described as the carbonate factory .
Unlike terrigenous rocks (like sandstone) which come from the erosion of older rocks, carbonates are "born, not made." They are produced in situ within "carbonate factories." origin of carbonate sedimentary rocks pdf new
Under specific conditions—warm, agitated water with low CO2cap C cap O sub 2 This is the dominant origin for modern and
Unlike siliciclastic rocks (sandstones/shales) which are derived from weathering of pre-existing rocks, carbonates form largely through chemical and biochemical processes. primarily limestones dolostones
This is the dominant origin for modern and ancient limestones.
Carbonate sedimentary rocks, primarily limestones dolostones , originate from the accumulation of calcium carbonate ( cap C a cap C cap O sub 3 ) or magnesium-rich minerals (
| Texture | Interpretation | |---------|----------------| | | Thrombolite (microbial) | | Laminated micrite | Stromatolite | | Radial fibrous ooids | Abiotic, high-energy | | Concavo-convex micritized grains | Bioeroded, reworked | | Fenestral fabric (birdseyes) | Tidal flat, desiccation | | Saddle dolomite | High-temperature burial cement |