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Formation of Tourmaline-Rich Gem Pockets in Miarolitic Pegmatites.
Am Mineral 1986 71:396-405
This report compares fluid-inclusion data from pegmatites in San Diego, California, and Kulam, Afghanistan, to identify the conditions under which gem pockets form. Miarolitic and massive rare-element pegmatites were found to crystallize under similar pressure- temperature conditions (2400 to 2800 bars and 425 deg to 475 deg c), and may also be controlled by the activities of alkali borate melt components.
IH; Final Contract Report;
Am. Mineral., V. 71, 1986, PP. 396-405
University of Oklahoma