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Palaeozoic crustal thickness in the southern part of the Lachlan orogen deduced from volcano and pluton‐spacing geometry

 

作者: M. J. Rickard,   P. Ward,  

 

期刊: Journal of the Geological Society of Australia  (Taylor Available online 1981)
卷期: Volume 28, issue 1-2  

页码: 19-32

 

ISSN:0016-7614

 

年代: 1981

 

DOI:10.1080/00167618108729141

 

出版商: Taylor & Francis Group

 

数据来源: Taylor

 

摘要:

The concept that spacing geometry of volcanoes reflects crustal or lithospheric thickness can be extended to granite plutons. Various factors may control pluton spacing, and the influence of faulting and erosion level is discussed. In southern New South Wales pluton spacing appears to have been largely controlled by a 6 to 10 km thick ‘brittle’ upper layer, but pluton clusters and batholiths are spaced wider, suggesting that the magma was derived from 12 to 25 km within the crust—a figure in accord with available mineral barometric data. S‐ and I‐type, granites have similar spacing geometries; the boundary between their source layers cannot be specifically determined, but is inferred to have been at about 20 km. A possible crustal thickness of 35 km is inferred from the spacing of granites in Victoria and Silurian volcanic centres.

 

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