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Petrology of hybrid intermediate and silicic rocks from Öræfajökull, southeast Iceland

 

作者: Tore Prestvik,  

 

期刊: Geologiska Föreningen i Stockholm Förhandlingar  （Taylor Available online 1980）
卷期: Volume 101, issue 4  

页码: 299-307

 

ISSN:0016-786X

 

年代: 1980

 

DOI:10.1080/11035898009450848

 

出版商: Taylor & Francis Group

 

关键词: Volcanic rocks;andesite;dacite;rhyolite;volcanic glass;calc-alkalic composition;mineral composition;chemical composition;hybridization;mixing;olivine;plagioclase;bytownite;andesine;clinopyroxene;diopside;augite;hypersthene;porphyritic texture;xenoliths;ba

 

数据来源: Taylor

 

摘要:

Intermediate and acid volcanic rocks from the Öræfajökull central volcano, southeast Iceland, are hybrids with calc-alkaline affinity. These rocks are characterized by basic xenocrysts of olivine, plagioclase, and clinopyroxene set in a glassy matrix. Linear variation curves for a number of major and trace elements show that the rocks are mixing products of basic and silicic members of the main series of the volcano. It is concluded that this mixing results from contamination of silicic melts by basaltic and gabbroic xenoliths.

 

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