Abstract
The Thetford and Asbestos ophiolites of the Eastern Townships of Quebec (Internal Domain) resemble the Betts Cove ophiolite of Newfoundland in three significant respects: (1) ultramafic cumulate sequences of the ophiolites include units with cumulus orthopyroxene; (2) the 'gabbro' unit is composed of a relatively thin yet compositionally and structurally complex clinopyroxenite–gabbro member which unconformably overlies the ultramafic cumulate sequence; and (3) basaltic rocks associated with the ophiolites have extremely low Ti contents. In contrast, in the Bay of Islands region of western Newfoundland (External Domain) basaltic rocks of the ophiolites of the Humber Arm Allochthon have Ti contents typical of normal oceanic crust; the cumulate sequences rarely contain cumulus orthopyroxene; and the 'gabbro' unit includes a major sequence of cumulus plagioclase-bearing rocks which appear to conformably follow the ultramafic cumulates. The Baie Verte ophiolite of Newfoundland is intermediate in character and...
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