极地研究 ›› 1991, Vol. 2 ›› Issue (1-English): 30-38.
Zheng Xiangshen, Liu Xiaohan
Zheng Xiangshen, Liu Xiaohan
摘要:
Cenozoic volcanic rocks in the Fildes Peninsula are composed of High-Al basalt, basaltlc andesite, andesite, and dacite belonging to a calc-alkaline volcanic series with low-K and high-A1 characteristics. Using a new indicator, the Sr/Ca-Ba/Ca, systematics proposed by Onuma (1980, 1981) and Sr, Ba, Ca concentrations in volcanic lavas and subvolcanic rocks, the authors find that the high-A1 basaltic volcanic rocks either in volcanic strata or in subvolcanic intrusives were formed from a primary magma, in different stages through the fractional crystallization of clinopyro-xene(Cpx)and plagioclase (P1) in the process of magmatic evolution, resulting in the formation of basaltic-andesitic, andesitic and dacitic rocks.