Call number:
ZSP-164-36
In:
Scientific reports
Description / Table of Contents:
The geology of the Loubet Coast of Graham Land is described. The rocks are nearly all igneous and comprise mainly volcanic rocks of an Upper Jurassic age and plutonics of the Andean Intrusive Suite. The Orford Cliff Suite, a distinctive suite of intrusive rocks occurring in the Lallemand Fjord area, is believed to be early Palaeozoic in age. Undoubted pre-Upper Jurrassic intrusive rocks crop out near Detaille Island and occur as fragments in Upper Jurassic pyroclastic rocks. Rocks of the Orford Cliff Suite contain xenoliths of the Basement Complex and screens of early Palaeozoic volcanic and hypabyssal rocks. Two other phases of hypabyssal intrusion are recognized. The first forms an integral part of the Upper Jurassic vulcanicity but the second is later in age than the Andean Intrusive Suite. The sequence of intrusion in both of the plutonic suites is from femic to salic. There is some thermal metamorphism, assimilation and metasomatism of the volcanic and earlier plutonic rocks by later intrusions. Hydrothermal alteration is almost ubiquitous. Rocks of the Orford Cliff Suite have undergone intense deformation but the Upper Jurassic volcanic and the Andean intrusive rocks are little deformed. A comparison is made with the geology of adjacent regions which are very similar.
Type of Medium:
Series available for loan
Pages:
50 S. : Ill., graph. Darst., Kt.
Series Statement:
Scientific reports / British Antarctic Survey 36
URL:
http://www.antarctica.ac.uk/about_bas/publications/scientific_reports/index.php
Branch Library:
AWI Library
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