Chemical variations in clay minerals of the Archaean Barberton Greenstone Belt (South Africa)

被引：6
|
作者：
Toulkeridis, T
Clauer, N
Kroner, A
机构：
[1] CNRS,CTR GEOCHIM SURFACE,F-67084 STRASBOURG,FRANCE
[2] UNIV MAINZ,INST GEOWISSENSCH,D-55099 MAINZ,GERMANY
来源：
PRECAMBRIAN RESEARCH | 1996年 / 79卷 / 3-4期
关键词：
D O I：
10.1016/S0301-9268(96)00081-2
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
Four rock profiles of shales, carbonates and greywacke-type sediments were sampled from the mafic compositional influenced sedimentary Fig Tree Group and from overlying, more felsic related, sedimentary Moodies Group of the Archaean Barberton Greenstone Belt in South Africa. Clay separates of forty sedimentary rocks were examined by XRD and SEM to study the mineralogical, chemical and morphological variations of the constitutive illite and chlorite. The clay minerals showed a significant K-enrichment in the illites and Mg- and Fe-depletions in the chlorites upwards the stratigraphic sequence. Three independent parameters influenced these variations: (1) a change in the origin of the source rocks; (2) the host-rock lithologies; and (3) a tectono-thermal recrystallization process.
引用
收藏
页码：195 / 207
页数：13
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