Abstract
High‐grade gneiss in the northern Prince Charles Mountains, East Antarctica, has a complex intrusive and deformational history. Outcrop is dominated by homogeneous felsic orthogneiss, which encloses boudinaged mafic and ultramafic units. These boudins preserve structures (S1, F2) not seen in the host gneiss, and are interpreted as transposed and boudinaged dykes. A sedimentary protolith is inferred for less homogeneous felsic gneiss interlayered with semi‐pelite, calc‐silicate and rare pelite. These basement lithologies were deformed into a series of flat‐lying structures (S3, F4) consistent with progressive horizontal shear, and then into a series of upright structures (F5) culminating in the development of regional synforms, antiforms and monoclines (F6) separated by zones of intense upright fabric (S6). The D3 to D6 time interval was associated with several episodes of partial melting which produced discordant Ieucogneiss bodies, and with the emplacement of mafic dykes and charnockite plutons correlate...
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