Petrology and Fe–Ti oxide reequilibration of the 1991 Mount Unzen mixed magma

Andersen, 1988, Internally consistent solution models for Fe–Mg–Mn–Ti oxides: Fe–Ti oxides, Am. Mineral., 73, 714 Andersen, 1993, A pascal program to assess equilibria among Fe–Mg–Ti oxides, pyroxenes, olivine, and quartz, Comp. Geosci., 19, 1333, 10.1016/0098-3004(93)90033-2 Bacon, 1988, Mg/Mn partitioning as a test for equilibrium between coexisting Fe–Ti oxides, Am. Mineral., 73, 57 Buddington, 1964, Iron–titanium oxide minerals and synthetic equivalents, J. Petrol., 5, 310, 10.1093/petrology/5.2.310 Carmichael, 1967, Iron–titanium oxides of salic volcanic rocks and their associated ferromagnesian silicates, Contrib. Mineral. Petrol., 14, 36, 10.1007/BF00370985 Devine, 1995, Comparison of microanalytical methods for estimating H2O contents of silicic volcanic glasses, Am. Mineral., 80, 319, 10.2138/am-1995-3-413 Eggler, 1973, Crystallization and fractionation trends in the system andesite–H2O–CO2–O2 at pressures to 10 kb, Geol. Soc. Am. Bull., 84, 2517, 10.1130/0016-7606(1973)84<2517:CAFTIT>2.0.CO;2 Fogel, R.A., 1989. The role of C–O–H–Si volatiles in planetary igneous and metamorphic processes: experimental and theoretical studies. PhD thesis, Brown University, Providence, RI, 201 pp. Freer, 1978, An experimental study of magnetite–titanomagnetite interdiffusion, Phys. Earth Planet. Inter., 16, 223, 10.1016/0031-9201(78)90015-8 Frost, 1991, Magnetic petrology: factors that control the occurrence of magnetite in crustal rocks, Mineral. Soc. Am. Rev. Mineral., 25, 481 Frost, 1991, Occurrence of iron titanium oxides in igneous rocks, Mineral. Soc. Am. Rev. Mineral., 25, 433 Frost, 1992, Equilibrium among Fe–Ti oxides, pyroxenes, olivine, and quartz. Part II: Applications, Am. Mineral., 77, 1004 Gardner, 1995, Petrologic diversity in Mount St. Helens dacites during the last 4000 years: implications for magma mixing, Contrib. Mineral. Petrol., 119, 224, 10.1007/BF00307283 Ghiorso, 1991, Fe–Ti oxide geothermometry: thermodynamic formulation and the estimation of intensive variables in silicic magmas, Contrib. Mineral. Petrol., 108, 485, 10.1007/BF00303452 Hammond, 1982, The ilmenite/magnetite assemblage: kinetics of re-equilibration, Earth Planet. Sci. Lett., 61, 143, 10.1016/0012-821X(82)90047-4 Johnson, 1989, Experimental calibration of the aluminum-in-hornblende geobarometer with application to the Long Valley caldera volcanic rocks, Geology, 17, 837, 10.1130/0091-7613(1989)017<0837:ECOTAI>2.3.CO;2 Lindsley, 1991, Oxides lie: the Bishop Tuff did not erupt from a thermally zoned magma body, EOS, 72, 312 Nakada, 1993, Preliminary report on the activity at Unzen Volcano (Japan), November 1990–November 1991: dacite lava domes and pyroclastic flows, J. Volcanol. Geotherm. Res., 54, 319, 10.1016/0377-0273(93)90070-8 Nakada, S., Shimizu, H., 1997. Outline of the 1990–1995 eruption at Unzen volcano. Proc. Unzen Int. Workshop: Decade Volcano and Scientific Drilling. Shimabara, Japan, pp. 3–8. Nakada, 1995, Manner of magma ascent at Unzen volcano, Geophys. Res. Lett., 22, 567, 10.1029/95GL00002 Nakada, S., Motomura, Y., Maeda, S., 1997. Compositional diversity of Unzen lava domes. Proc. Unzen Int. Workshop Decade Volcano and Scientific Drilling. Shimabara, Japan, pp. 78–82. Nakamura, 1995, Continuous mixing of crystal mush and replenished magma in the ongoing Unzen eruption, Geology, 23, 807, 10.1130/0091-7613(1995)023<0807:CMOCMA>2.3.CO;2 Powell, 1977, Geothermometry and oxygen barometry using coexisting iron–titanium oxides: a re-appraisal, Mineralogical Magazine, 41, 257, 10.1180/minmag.1977.041.318.14 Rutherford, 1988, The May 18, 1980 eruption of Mount St. Helens. 3: Stability and chemistry of amphibole in the magma chamber, J. Geophys. Res., 93, 11949, 10.1029/JB093iB10p11949 Rutherford, 1993, Magma ascent rates from amphibole breakdown: An experimental study applied to the 1980–1986 Mount St. Helens eruptions, J. Geophys. Res., 98, 19667, 10.1029/93JB01613 Rutherford, 1998, Changing magma conditions and ascent rates during the Soufriere Hills eruption on Montserrat, GSA Today, 8, 1 Sato, H., Nakada, S., Fujii, T., Nakamura, K., Suzuki-Kamata, 1997. Groundmass amphibole in the 1991–1995 dome dacite of Unzen Volcano: experimental phase equilibrium studies and volcanological implications. Proc. Unzen Int. Workshop Decade Volcano and Scientific Drilling. Shimabara, Japan, pp. 88–90. Shimizu, H., Umakoshi, K., Matsuwo, N., Matsushima, T., Ohta, K., 1997. Seismic activity associated with the magma ascent and dome growth of Unzen volcano. Proc. Unzen Int. Workshop Decade Volcano and Scientific Drilling. Shimabara, Japan, pp. 42–44. Spencer, 1981, A solution model for coexisting iron–titanium oxides, Am. Mineral, 66, 1189 Stormer, 1983, The effects of recalculation on estimates of temperature and oxygen fugacity from analyses of multi-component iron–titanium oxides, Am. Mineral, 68, 586 Venezky, 1997, Pre-eruption conditions and timing of dacite–andesite mixing in the 2.2 ka eruption of Mount Rainier, J. Geophys. Res., 102, 20069, 10.1029/97JB01590