HR: 1330h
AN: V12C-0598    [PDF]
TI: Melting experiments of a peridotite from Penghu area, Taiwan, at pressures up to 2 GPa.
AU: * Liu, T
EM: liutc@cc.ntnu.edu.tw
AF: Department of Earth Science N. T. N. U., 88, Sec. 4, Ding Zou Road, Taipei, 116 Taiwan
AU: Kuo, R
EM: liutc@cc.ntnu.edu.tw
AF: Department of Earth Science N. T. N. U., 88, Sec. 4, Ding Zou Road, Taipei, 116 Taiwan
AU: Iizuka, Y
EM: yiizuka@earth.sinica.edu.tw
AF: Institute of Earth Sciences Academia Sinica, P. O. Box 1-15, Nankang, Taipei, 115 Taiwan
AB: A peridotite occurred as a xenolith in alkali basalt of Penghu, Islands, in Taiwan Strait, Taiwan, was studied with a quenching furnace and a piston-cylinder apparatus. The compositions of melting products showed the trends as the decreasing of Al2O3, CaO, Na2O, and K2O and the increasing of MgO as the melting temperature increased at specific pressure. At the specific temperature, the SiO2 of melting products decreased as the pressure increased. The basalts of Penghu can be classified as alkali basalt, olivine tholeiite, and quartz tholeiite based on the classification of basalt tetrahedron. The quartz tholeiite of Penghu could be modeled as 10% to 24% partial melt product from the peridotite at 0.5 GPa. The olivine tholeiite of Penghu was proposed to be the partial melting, up to 23%, products from the peridotite at 1.0 and 1.5 GPa. Comparing the compositions of melting products with the basalts of Penghu, we proposed that the primitive basaltic magmas of Penghu had been fractional crystallized to produce the basalts of Penghu.
DE: 3630 Experimental mineralogy and petrology
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2003 Fall Meeting