GEOCHEMICAL AND MINERALOGICAL INVESTIGATION OF SOME BRITISH AND OTHER EUROPEAN TONSTEINS

被引：98

作者：

SPEARS, DA

KANARISSOTIRIOU, R

机构：

[1] Department of Geology, The University, Sheffield

来源：

SEDIMENTOLOGY | 1979年 / 26卷 / 03期

关键词：

D O I：

10.1111/j.1365-3091.1979.tb00917.x

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

The volcanic origin of a number of major tonstein horizons has been established from mineralogical compositions and from trace elements that are quantitatively retained during diagenesis. Discriminant function analysis using the variables Ti/Al, Cr/Al, Zr/Al and Ni/Al allows the tonsteins to be classified according to original composition. Two main groups are recognized amongst the British tonsteins. Those formed from acid volcanic ash are comparable in composition with French and German tonsteins and a common source is postulated, whereas tonsteins formed from basic volcanic ash contain variable amounts of detrital sediment and are thought to originate from local eruptions. Possible lateral equivalents between tonstein horizons in Britain and elsewhere in Europe are suggested. Copyright © 1979, Wiley Blackwell. All rights reserved

引用

页码：407 / 425

页数：19

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