Electronic Resource
Springer
International journal of earth sciences
47 (1959), S. 531-542
ISSN:
1437-3262
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
Notes:
Summary Structural elements impressed upon the more easterly extensions of the Westralian shield were dominantly east-west features. These tendencies have channelled subsequent orogenies and geomorphic evolution, right down through the long history of the area. Possibly two major anticlinal zones were devoleped along east-west zones, to be preserved to the present day as mountainous ranges and inselbergs. Massive batholithic intrusions mark the more southern zone, whereas outcropping rocks in the more northerly zone are predominantly metasedimentary. The granite zone is one of intense negative Bouguer anomaly (−150 milligals) indicating a strong density contrast between these massive granites of low density and the foliated granite gneisses of the northern chain. The strength of the earth's crust, locally, must be immense to support such unbalanced load, and yet deep grabens with inliers of Upper Proterozoic and Ordovician sediments flank the negative anomaly on both margins.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01800672
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