A SIMPLE ALKALINITY RATIO AND ITS APPLICATION TO QUESTIONS OF NON-OROGENIC GRANITE GENESIS

被引：649

作者：

WRIGHT, JB

机构：

[1] Department of Geology, Ahmadu Bello University, Republic of Nigeria, Zaria

来源：

GEOLOGICAL MAGAZINE | 1969年 / 106卷 / 04期

关键词：

D O I：

10.1017/S0016756800058222

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Commonly used variation diagrams do not convincingly distinguish strongly alkaline, alkaline and calc-alkaline rocks over the full range of silica contents, especially for more acid varieties. In particular, the Rittmann Suite Index, a, becomes invalid once SiO2 exceeds about 70%. © 1969, Cambridge University Press. All rights reserved.

引用

页码：370 / &

共 57 条

[1] DISCOVERY OF A TIN-TUNGSTEN MINERALIZATION IN NORTHERN KHARTOUM PROVINCE SUDAN [J].