Re-evaluation and optimisation of dissolution methods for strontium isotope stratigraphy based on chemical leaching of carbonate certificated reference materials
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Keywords:
Dolostone
Ammonium carbonate
Carbonate minerals
Strontium carbonate
Solution-ICP-MS and LA-ICP-MS are the most common analytical methods for measuring rare earth elements in carbonate minerals of carbonate rocks.HCl and HNO3 not only can completely dissolve carbonate minerals in carbonate rocks but also dissolve some other minerals,and such will disturb the analytical results.CH3COOH,on the other hand,can avoid interferences from non-carbonate minerals,but probably cannot completely dissolve carbonate minerals in carbonate rocks,and such will also cause bias from the true result.LA-ICP-MS,which uses laser beam to ablate carbonate minerals and directly analyze rare earth elements contents in the evaporation,is an effective method for analyzing carbonate mineral crystals in carbonate rocks.But this method may also be questionable since the diameter of the laser beam may be too large to avoid tiny clay minerals in carbonate minerals.In summary,the results obtained by solution-ICP-MS and LA-ICP-MS on the shale-normalized REE patterns and their main parameters of carbonate minerals in carbonate rocks are comparable,and both methods can be used to trace the sedimentary environment.
Carbonate minerals
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Dolostone
Grainstone
Breccia
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Determining the dissolution rates of carbonate rocks is vital to advancing our understanding of cave, karst, and landscape processes. Furthermore, the role of carbonate dissolution is important for the global carbon budget and climate change. A laboratory experiment was setup to calculate the dissolution rates of two whole rock carbonate samples with different petrographic makeup (ooids and brachiopods). The carbonate rock samples were also explored under a scanning electron microscope to evaluate the textures that developed after dissolution The oolitic limestone dissolved at a rate of 1579 cm yr−1, and the pentamerous limestone (dolostone) dissolved at a rate of 799 cm yr−1. Both rocks did not dissolve evenly across their surface as indicated by scanning electron microscopy, it appears the allochems dissolved preferentially to the matrix/cement of the rocks and that some mechanical weathering happened as well. This work reports that the petrography and mineralogy of carbonate rocks is important to consider when exploring the cave, karst, and landscape evolution and that attention should be paid to the petrography of carbonate rocks when considering the global carbon budget.
Dolostone
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