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Contact metamorphism adjacent to a teschenite intrusion

 

作者: H. G. Wilshire,  

 

期刊: Journal of the Geological Society of Australia  (Taylor Available online 1958)
卷期: Volume 6, issue 1  

页码: 11-20

 

ISSN:0016-7614

 

年代: 1958

 

DOI:10.1080/00167615808728492

 

出版商: Taylor & Francis Group

 

数据来源: Taylor

 

摘要:

Shale adjacent to the upper contact of an annular teschenite intrusion was converted to andalusite hornfels in an aureole 2–4 feet wide. At some points along the contact there is no evidence of anhydrous recrystallization. Rarely, magmatic reaction with small shale xenoliths resulted in formation of cordierite‐sillimanite (?) hornfelses, and locally a very small‐scale movement of magmatic constituents took place across the contact before consolidation of the teschenite. Very severe deuteric alteration of teschenite adjacent to the contact resulted in large losses of Si, Fe, Mg, alkalis, and probably Ca, some of which were recombined in clays and carbonates in the more porous shales and in joints, but analyses of uniformly fine‐grained shales indicate little change in bulk composition. Mineralogical evidence indicates a maximum contact temperature within the range 500°‐600° C, and a maximum intrusion temperature within the range 1000°‐1200° C.

 

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