Sulfide–oxide Assemblage in Tagish Lake Carbonaceous Chondrite;
نویسندگان
چکیده
Introduction: Tagish Lake, an observed fall in the year 2000, was classified by [1] as a type 2 carbonaceous chondrite. It bears similarity to CI 1 and CM chondrites but is distinct from both. [2] noted that the overall trace elements abundance pattern in Tagish Lake is similar to those of CM chondrites indicating that Tagish Lake and CMs experienced very similar nebular processes. The mineralogy of Tagish Lake was studied by [1], who identified two lithologies a dominant carbonate-poor lithology and a less abundant carbonate lithology. Abundant phyllosilicate indicates that aqueous alterations affected both lithologies. Aqueous fluids were abundant during the alteration process as suggested by the oxygen isotope data of [3], which requires a water/rock ratio of 2.This is higher by a factor of 2 than estimates for CM or CI. In this investigation, we report on sulfide and oxide minerals in Tagish Lake and assess their origin.
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