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A kinematic analysis of the southernmost part of the Bega Batholith

 

作者: Jean‐Pierre Burg,   ChristopherJ. L. Wilson,  

 

期刊: Australian Journal of Earth Sciences  (Taylor Available online 1988)
卷期: Volume 35, issue 1  

页码: 1-13

 

ISSN:0812-0099

 

年代: 1988

 

DOI:10.1080/08120098808729435

 

出版商: Taylor & Francis Group

 

关键词: Bega Batholith;ductile deformation;granite;Lachlan Fold Belt;shearing

 

数据来源: Taylor

 

摘要:

The foliation developed in parts of the Bega Batholith is related to the mode of granite emplacement and the regional tectonic setting. In the Cape Conran area in Victoria, folding and metamorphism coincide with the intrusion of the granite. During emplacement and cooling, a primary homogeneous syntectonic foliation (S) was developed and deformed by ductile shear bands (C), the S C fabric suggesting a minimum easterly displacement of approximately 3 km within the granite body. Quartzc‐axis fabrics in the granite define girdle patterns lying at high angles to an eastward shear direction and these are characteristic of a subsolidus deformation in the granite. These observations are compatible with plutonism during east‐west compression in an eastward shear regime. Similar examples in east Gippsland suggest that eastward shearing was a characteristic kinematic element of this part of the Lachlan Fold Belt during the late Middle Devonian.

 

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