Abstract
The Gordon Limestone is characterized by low Mn, moderate Na and high Sr concentrations, similar to those in modern tropical aragonitic carbonates. Mn reflects predominantly original aragonite mineralogy, oxidizing peritidal conditions and the influence of meteoric water. Sr and Na concentrations generally decrease with increasing Mn. Na concentrations are similar in limestones and dolomitic limestones because of the lack of appreciable freshwater influence during dolomitization. Sr concentrations decrease with increasing Mg concentrations, indicating dolomitization in predominantly marine waters. Similar amounts of Mn in both limestones and dolomitic limestones indicate prevalence of oxidizing conditions during their formation. A Ba content of mostly <60 parts/106 indicates mainly marine origin for limestones and dolomitic limestones. Ti reflects the clay mineral content in each sample. Positive correlation between Rb and K2O supports marine origin of clays within the carbonates. Positive correlation between insoluble residue percentage and K2O suggests that illite is the predominant non-carbonate mineral. The dolomites are enriched relative to calcite by 2–3% PDB in δ18O and about 1% PDB in δ13C, indicating formation in mainly marine and mixed-marine waters at temperatures averaging 23°C.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
