Call number:
ZSP-164-43
In:
Scientific reports
Description / Table of Contents:
The general stratigraphy of the Neny Fjord area of Marguerite Bay is described with specific reference to the Basement Complex metamorphic rocks. The scattered nature of the rock outcrops in this area precludes far-reaching petrological correlations and a form of metamorphic correlation has been used. The Basement Complex rocks have been subdivided into three major groups: banded biotite-gneisses, dioritic gneisses and granite-gneisses, of which the latter two groups are undoubtedly ortho-gneisses. The banded biotite-gneisses, which are the oldest and are believed to be of a sedimentary origin, formed a basement into which the dioritic gneisses and the granite-gneisses were successively intruded later. After the further intrusion of a series of basic dykes, metamorphism , potash metasomatism and local mobilization of the granite-gneisses took place. This metamorphism reached the lower stages of the almandine-amphibolite facies, and after the intrusion of a second group of basic rocks there followed another metamorphism of the albite-epidote-amphibolite facies. During the intrusion of the (?) early Palaeozoic plutonic rocks, the Basement Complex was locally mobilized, but when the Andean Intrusive Suite was emplaced the Basement Complex was rigid and block-faulting occurred in this area. At Randall Rocks the contact metamorphic aureole aurrounding the Andean biotite-granite has been traced in the granite-gneiss. A major fault line which passes through Roman Four Promontory, Neny Island and Millerand Island subdivides this whole area into two distinct petrological parts.
Type of Medium:
Series available for loan
Pages:
49 S.
Series Statement:
Scientific reports / British Antarctic Survey 43
URL:
http://www.antarctica.ac.uk/about_bas/publications/scientific_reports/index.php
Branch Library:
AWI Library
