Simon Auclair

Date of Award


Degree Type


Degree Name

Master of Science


Dr. Gordon Osinski

Second Advisor

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.



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