The carbon and oxygen isotopic composition of carbonates from a mica peridotite dike near Dixonville, Pennsylvania

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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 C 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 C 13 gradients exist.

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