南雄市百顺地区花岗岩体地质特征

初步研究了百顺地区花岗岩体的地质特征,主要以印支期和燕山期的花岗岩为主。该2期花岗岩体的SiO2和Al2O3质量分数较高,分别为63.60%~75.37%和12.12%~18.78%;SiO2与Al2O3、CaO、MgO、FeO、MnO、K2O、TiO2之间的负相关,以及与Na2O、P2O5之间的正相关都不是很明显。全碱(Na2O+K2O)质量分数均较高,为7.17%~13.77%,为过碱性花岗岩。铝饱和指数(ACNK)在0.92%~1.65%之间,碱度指数(A/NK)为1.06%~1.80%,为过铝质。

Nanxiong City Baishun Area Granite Geology Characteristics

The granite geology characteristics of Baishun area are preliminarily discussed,in the main of Indo-Chinese epoch and Yanshan epoch. SiO2 and Al2O3 contents of these two epochs granites are all relatively high, separately are 63.60%~75.37% and 12.12%~18.78%; the negative correlations of SiO2 with Al2O3, CaO, MgO, FeO, MnO, K2O, TiO2 are not obvious, the same with positive corrections of SiO2 with Na2O、 P2O5. The contents of the whole bases （Na2O＋K2O） are all high, 7.17%~13.77%, so it should be peralkaline granite. The aluminum saturation index （ACNK） are between 0.92%~1.65%, and the alkalinity index （A/NK） are between 1.06%and 1.80%, so it＇s peraluminous.