Date of Award
Master of Science
Dr. Gordon Osinski
Dr. Neil Banerjee
From over 60 terrestrial impact craters with evidence of impact-induced hydrothermal
alteration, only a dozen have been examined for stable isotopic compositions of
hydrothermal carbonates. A variety of impact-induced carbonate precipitates have been
identified at the Haughton impact structure (23 km, 39 Ma) on Devon Island, Canadian
Arctic. The hydrothermal carbonates are found in three distinct settings: (1) as fracture
fillings in shocked lithologies of the inner crater; (3) as vug fillings within impact melt
breccias, and (3) as interstice fillings in pipe structures of the crater rim. X-Ray Powder
Diffraction, X-Ray Fluorescence and carbon and oxygen stable isotope analyses were
performed on rock and calcite mineralisation samples. Values of ô13Ccaicite range from
-14 to -2%o, indicating an inorganic carbon source. Values of 6 Ocaicite range from
+8 to +18 %o, corresponding to a 5 OflUid of -7 to +2%o, most likely an enriched polar meteoric source at temperatures of mineralisation >130°C.
Auclair, Simon, "STABLE CARBON AND OXYGEN ISOTOPIC STUDY OF IMPACT-INDUCED HYDROTHERMAL CALCITE AT THE HAUGHTON IMPACT STRUCTURE, DEVON ISLAND, NUNAVUT, CANADA" (2011). Digitized Theses. 3534.