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3 Fluid Inclusions Minerals in metamorphic rocks contain fluid inclusions in an impressive variety (Hollister and Crawford, 1981). The inclusions are thought to trap fluids that existed when the minerals in the rocks crystallized. They are mixtures of water, carbon dioxide, methane, and nitrogen in almost all possible proportions. In ad- dition, salts (principally sodium and calcium chlorides) may be dissolved in the aqueous fraction of the inclusions. The nature of fluids at depth has profound implications for heat and mass transfer and for metamorphic reactions in rocks. Fluids in fluid inclusions have been studied from numerous widely separated rock samples from metamorphic terranes, but no study has been possi- ble of samples recovered in sequence from a deep drill hole in an orogenic terrane. Although fluid inclusions are likely to be present in cuttings, only in core samples could fluid inclusions be studied in the context of the petrogenesis of their host rocks as determined by metamorphic petrology.