Abstract

Demonstrates that differential compaction of sediments over buried hills could not have been the primary cause of the plains-type (epeirogenic) folding exemplified by the Dukhan anticline of the Qatar peninsula and similar folds in Mesozoic and Tertiary formations elsewhere in the Zagros foreland region. An empirical geometric method is presented for analysis of such structures, which are characterized by an increase in amplitude of folding with depth and by thickening of sediments in various directions in response to regional tilting. The geometric expression of these epeirogenic folds differs from that of folds in adjacent orogenic areas, presumably reflecting an independent origin. The apparent association between folding and sedimentation, and the possible origin of the vertical forces considered responsible for the formation of epeirogenic folds are considered.

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