Metabasite amphiboles of the Scottish Dalradian

A study of mylonitic rocks from major fault zones : [annual technical report]

“…The interpretation of the P/T ratio does not strongly depend on whether the interpretation of the zoning mechanism is completely correct. Comparing the RA-ll-D data to the results of Leake (1965), Raase (1974), Graham (1974), andLaird (1977), these amphiboles were formed under intermediate P/T conditions, similar to the regional metamorphic conditions of the Dalradian rocks in southwestern Scotland and of intermediate pressure areas in the regionally metamorphosed Paleozoic rocks of western New England. The overall mineral assemblage in RA-ll-L is appropriate for making the comparisons.…”

Hawaiian basalt and Icelandic rhyolite: Indicators of differentiation and partial melting

“…Because the actinolite and ferroactinoite material is always mantled by hornblende and is not in contact with the groundmass, CARMODY (1991) inferred that the actinolite could not have been in equilibrium with the silicic magma (thus ruling out the possibility that the two amphiboles resulted from co-precipitation across a miscibility gap, as experimentally determined by OBA (1980) and OBA • YAGI (1987)). Similar patchy acfinolite cores in hornblende have been found in amphibolite grade metabasalts by GRAHAM (1974) and GRAPES & GRAHAM (1978) and are interpreted to have been generated at greenschist fades conditions. According to these workers, the actinolite cores failed to be converted to hornblende, due to the slow kine-tics of the reaction, and persisted into amphibolite facies rocks.…”

Hydrothermal Alteration of Peridotite from the Galicia Margin, Iberian Peninsula

“…Although there is much discussion in the literature about the presence (e.g., Robinson et al, 1981) or absence (e.g., Grapes and Graham, 1978) of a calcic amphibole solvus, experimental evidence suggests a well-defined solvus (e.g., Oba, 1980), and many hornblende-actinolite pairs have been observed in nature (e.g., Klein, 1969;Cooper and Lovering, 1970;Brady, 1974;Misch and Rice, 1975;Tagiri, 1977;Graham, 1974;Sampson and Fawcett, 1977). Although the shape and exact temperature of the crest of the solvus are not known, a stylized solvus has been constructed (using the cited data; after Robinson et al, 1981) and is shown as Figure 3.…”