I don't know much about sedimentology. Two question about carbonate sediment were bothering me in recent studies. Hope you can give me some suggestions or references. Thank you in advance!
Two questions about precambrian carbonates:
Q1: Did Precambrian carbonate sediments often undergo dolomitization after deposition?
Q2: Did Precambrian carbonate sediments (especially dolostone?) usually with high Mn/Sr ratio, and this diagenesis criteria whether or not perfectly fir for the Precambrian carbonate sediments?
Yes I am gona say that the limestone with older geologic age its probbability to converted to dolomite increases.
Sorry I don’t how to reply your helpful suggestions in there directly. So, by this way to show my thanks!
Q1: Yes, Precambrian carbonate sediments often underwent dolomitization after deposition. This process occurred due to the chemical environment of early Earth, where seawater was rich in magnesium. Dolomitization typically affected these sediments during burial diagenesis, converting limestone into dolostone. The widespread occurrence of dolostone in Precambrian strata is a key evidence for this process. This transformation also altered the porosity and permeability of the carbonate rocks, impacting later fluid flow and mineralization.
Q2: Precambrian dolostones are commonly associated with a high Mn/Sr ratio, which reflects diagenetic alteration. The elevated manganese levels indicate interaction with reducing fluids, while the depletion of strontium results from recrystallization processes. This Mn/Sr ratio serves as a useful criterion for identifying diagenetic changes in carbonate rocks, but it is not a perfect indicator. In Precambrian carbonates, the complex diagenetic history and variations in original seawater chemistry can make it difficult to apply this ratio universally as a diagnostic tool. Thus, while helpful, it should be used with caution.
- Badges
- Science topic
- Similar topics
- Computer Communications (Networks)
- Simulators