Unequivocal identifications of individual daughter minerals extracted from fluid inclusions have been obtained using microtechniques in conjunction with the Gandolfi X-ray camera. This development represents a major advance in fluid inclusion research because solid phases from preselected fluid inclusions may now be routinely and unambiguously identified. Application of this technique allows the worker to not only measure the homogenization and freezing temperatures of a fluid inclusion of known origin but also to identify any daughter minerals that might be present in the same inclusion, provided that these phases are recognizable both before and after heating/freezing tests, and that the heating/freezing tests have not affected the daughter phases. This procedure yields considerably more information about the physical and chemical conditions attending mineral deposition than is presently available from conventional fluid inclusion analyses.

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