Paper Information

Journal:   IRANIAN INTERNATIONAL JOURNAL OF SCIENCE   Spring 2001 , Volume 2 , Number 1; Page(s) 33 To 54.
 
Paper: 

ISOTOPIC SIGNATURE OF THE DIAGENETIC FLUIDS AND CEMENT IN THE TORTACHILLA LIMESTONE, SOUTH AUSTRALIA

 
 
Author(s):  RAHIMPOUR BONAB HOSSEIN, BONE Y.
 
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Abstract: 
Stable isotope analysis of carbonate rocks and fossils can be employed for reconstruction of the ancient sedimentary environments and their diagenetic history, estimation of the isotopic composition, origin and temperature of seawater and diagenetic fluids. In this study, relying upon earlier investigations by authors and others in the Tertiary sequences of St. Vincent Basin of South Australia, the diagenetic setting, isotopic compositions, origin of diagenetic fluids and cement are constrained. The isotopic signature of meteoric cement is controlled by the isotopic composition of the original marine calcites (e.g., calcareous organisms) and the meteoric fluids. The isotopic composition of this meteoric cement is used to constrain the isotopic signature of diagenetic fluids. The isotopic composition of diagenetic Low Mg-Calcite (dLMC) meteoric cement of the Tortachilla Limestone represents an isotopically light composition (highly depleted) relative to the isotopic composition of marine calcite. This suggests that seawater had no significant contribution to the formation of this cement. On the other hand, the isotopic value of this cement is close to the values reported for the calcite precipitated from modern coastal and island meteoric water in similar latitude (51.5°). The meteoric calcite cement of this unit shows the inverted-J pattern, which is characterized by concomitant invariability in d18O and variability in its d13C signature. The isotopic composition of seawater is also estimated by using the well-preserved fossil materials
 
Keyword(s): STABLE ISOTOPES, METEORIC CEMENT, AUSTRALIA, DIAGENESIS
 
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