Abstract
In the middle Cambrian to lower Ordovician of Tarim Basin,occurs a little limestone,which is the studied object in this research,aimed at seawater geochemical reconstruction.Geochemical results showed that a linear correlation was demonstrated between the oxygen isotope values and the MgO% content,which indicates that dolomitization will lead to higher oxygen isotope values.The intercept of the line on the δ18O axis is-8.6‰,representing the oxygen isotope value of original limstones,and the oxygen isotope value of paleo-seawater can be calculated with value of-8.9‰.The average 87Sr/86Sr value is 0.708 918,which can be considered as the value of paleo-seawater.In the PAAS-normalized Rare Earth Elements diagram,LREE-enriched pattern can be seen in the studied limstones,which might represent the REE characteristics of paleo-seawater.
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