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    STUDIA GEOLOGIA - Issue no. 1 / 2007  
         
  Article:   POSSIBLE PALEOCLIMATIC RECORD FROM FOSSIL HYDROTHERMAL SYSTEMS IN THE ROSS SEA AREA (ANTARCTICA).

Authors:  L. DALLAI, R. BURGESS. 		 
       
         
  Abstract:  During Cenozoic time, diffuse alkaline magmatism related to the rifting in the Ross Sea Embayment intruded the northeastern region of the Wilson Terrane, Antarctica. Plutons with syenitic-monzonitic to gabbroic compositions provided the necessary heat source for local hydrothermal systems to occur in fractured rocks. Oxygen and hydrogen isotope investigation of altered granitoids along the Ross Sea coastline were undertaken to constrain the characteristics of Eocene fossil hydrothermal systems. The δ18O values, as low as 4‰ in K-feldspar of country rocks, and the δ D values of biotite/amphibole in the range of -100‰ to -200‰, indicate that these minerals interacted with meteoric-dominated hydrothermal waters. The δ 18O and δ D values of minerals were used to reconstruct the isotopic composition of the meteoric - hydrothermal waters.  
         
     
         
         
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