Structural analysis of the Broken Hill Block

Bruce E. Hobbs, N. J. Archibald, MA ETHERIDGE, V. J. Wall

Research output: Contribution to journalMeeting abstractpeer-review


The aim of this paper is to discuss the philosophies involved in the
interpretation of multiply deformed terrains with special emphasis, as
an example, on the Broken Hill Block. A structural interpretation of
the area is presented involving four periods of deformation each
associated with the development of macroscopic folds. In addition,
later structures associated with retrograde schist zones are developed.
Earlier workers have used a classical (Weissian) approach employing
mesoscopic fabric elements which have been assembled into a
chronological scheme and then used to interpret the macroscopic
structure. This led to a macroscopic picture of essentially upright folds
superposed coaxially on earlier nappe-like folds. The present study
employs the mapped outcrop patterns combined with the spatial
distribution of structural facings to identify the macroscopic structure.
A step is then made backwards in scale from the macroscopic to
mesoscopic to discuss the significance of the mesoscopic fabric elements.
On this basis, the regional structure consists essentially of early,
inclined to recumbent folds with later upright folds superposed almost
at right angles to the trend of the earlier axes. This leads not only to a
difference in macroscopic structure between the two approaches but
important differences in mesoscopic interpretations arise as well.
Original languageEnglish
Pages (from-to)493-493
Number of pages1
JournalJournal of Structural Geology
Issue number3-4
Publication statusPublished - 1985
Externally publishedYes


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