Abstract
The mica peridotite dike at Dixonville, Pennsylvania, belongs to a belt of ultramafic intrusions in eastern North America. Samples in a cross section through the dike, approximately 14 cm wide at the point of study, have been investigated. The carbon and oxygen isotopic composition of carbonate inclusions, of a 1 to 2 mm thick dolomite vein and of the carbonate contained in the fine-grained matrix of the peridotite were measured. The carbonate inclusions contain the heaviest terrestrial carbon discovered so far, their δC 13 values with respect to the PDB standard range from 12%. to 24.8%.. The carbon and oxygen isotopic composition varies systematically through the cross section of the dike and extremely steep δC 13 gradients exist.
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