Abstract: (336 Views)
In this study, petrography and elemental geochemistry of carbonate units of Gachsaran Formation have been studied in order to understand the diagenesis processes and primary mineralogical of this formation. In this area, a 380-meter-thick surface section has been selected in 46 kilometers to southwest of Khorramabad. In this section, the paragenetic sequences of Gachsaran Formation deposits ha been interpreted in four environments: marine, burial, upwelling and fresh water, and occurred during three stages of initial (eogenesis), middle (mesogenesis) and final (telogenesis) diagenesis. The changes trend of Sr element to Na compared to Mn showed that the studied samples are in the range of Gordon limestones of Tasmania or in its vicinity, but with a similar trend to aragonite composition. Moreover, the trend of changes of Mn element against Sr in the studied samples showed that these samples are in the same range as the primary mineralogy of the aragonite carbonates of the Mozduran Formation, which confirm the aragonite mineralogy of the primary limestones of the Gachsaran Formation in the studied section. The high ratio of Sr/Mn, Sr/Ca, low amounts of Fe and Mn, the high proportion of Sr element in the studied samples and plotting Sr/Ca values against Mn, Mg, Fe elements indicate a dominant closed to slightly open diagenesis system in a weak and with the few exchange of water-to-rock ratio (W/R) for the carbonates of Gachsaran Formation.
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