Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
16 Cards in this Set
- Front
- Back
Name three different environments in which carbonate diagenesis occurs |
Near surface marine. |
|
Describe the process of cementation. |
Mineral growth in voids, between grains or in cavities. |
|
Describe neomorphism. |
Replacement and recrystallization of minerals. |
|
Describe micritisation. |
Alteration of grains on or below the seafloor. |
|
Describe carbonate compaction. |
Compaction of sediments is driven towards lower porosities and higher densities as a function of increasing stress and chemical reactions. |
|
Describe dissolution. |
Undersaturated pore fluids, dissolve carbonates. |
|
Describe dolomitization. |
Process of transforming limestone into dolomite. When limestone comes into contact with magnesium-rich water calcite, CaCO3 is replaced with calcium and magnesium carbonate, CaMg(CO3)2 requireing large scale recrystalization. |
|
Name some common principal carbonate cements. |
Aragonite. High-Mg calcite. Low-Mg calcite. Dolomite. |
|
Name some less common carbonate cements. |
Ankerite. Siderite. Kaolinite. Quartz. Halite. Anhydrite. |
|
What does the mineralogy and morphology of carbonate cements depend on? |
The Mg/Ca ratio and carbonate supply rate. |
|
What are the three main diagenetic environments? |
Marine (vadose and phreatic). Burial at depth. |
|
Name 6 different processes associated with carbonate diagenesis? |
Dissolution.
Cementation. Micritsation. Neomorphism. Compaction. Dolomitization. |
|
List 4 different cement morphologies associated with carbonate diagenesis? |
Isopachous. Acicular. Equant. Drusy? |
|
Provide a fully annotated sketch of a carbonate shelf, illustrating the location of different marine and meteoric diagenetic zones (phreatic & vadose, etc). |
LEARN THIS! |
|
Describe and account for the diagenetic processes and products identifiable in the meteoric diagenetic zones. |
See word document |
|
Describe and account for the processes and products identifiable in marine diagenetic zones. |
See word document. |