Origin Of Carbonate Sedimentary Rocks Pdf New Now

Deep Guide: The Origin of Carbonate Sedimentary Rocks (A Modern Synthesis)

Comprehensive Guide: The Origin of Carbonate Sedimentary Rocks

1. Introduction: What are Carbonate Rocks?

Carbonate rocks are sedimentary rocks composed primarily of carbonate minerals.

• Dominant Minerals: Calcite (CaCO₃) and Dolomite (CaMg(CO₃)₂).
• Key Texts: When searching for "new" PDFs, you will likely encounter works by Sam Boggs Jr. (Principles of Sedimentology and Stratigraphy) or J.L. Wilson (Carbonate Facies in Geologic History).

3.2 Chemical/Abiotic Origin

• Ooids: Form in warm, agitated, supersaturated waters (e.g., Bahamas). Sand-sized grains grow concentric layers around a nucleus.
• Travertine & Tufa: Freshwater carbonates precipitated due to CO₂ degassing (springs, caves) or plant metabolism.
• Whiting Events: Suspended fine carbonate mud precipitated directly from water column due to temperature/biological triggers.

4. Diagenesis as a Continuum of Origin

The PDF argues that "origin" should include early diagenesis. There is no sharp line between a sediment and a rock. Key processes: origin of carbonate sedimentary rocks pdf new

• Neomorphism: Recrystallization of aragonite to calcite.
• Cementation: Syndepositional cements (beachrock, hardgrounds).
• Micritization: Boring algae and fungi convert skeletal grains to micrite within decades.

---