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Geological Society, London, Special Publications; 1984; v. 17; p. 203-212;
DOI: 10.1144/GSL.SP.1984.017.01.13
© 1984 Geological Society of London

2. Neoththys: Levant and North African offshore

Evidence for Early-Middle Triassic faulting and possible rifting from the Helez Deep Borehole in the coastal plain of Israel

Yehezkeel Druckman

Geological Survey of Israel, 30, Malkhei Israel St. Jerusalem 95501, Israel

A 600 m thick conglomerate, the Erez conglomerate, was penetrated in the Helez Deep borehole, drilled in the Coastal Plain of Israel. This conglomerate is underlain by a 40 m thick sandy shale of probable Early Triassic age, and is overlain by 190 m of Late Triassic peritidal dolomites. This sedimentary sequence is underlain by metamorphic Precambrian basement.

The Erez conglomerate is polymictic, consisting of various types of carbonate fragments, of ages varying from Upper Permian to Anisian. The fragments are angular to subrounded, poorly sorted, ranging in diameter from fractions of a millimetre to several decimetres. The matrix consists of black argillaceous micrite, yielding palynomorphs of Scythian-Anisian age.

It is suggested that the Erez Conglomerate is analogous to the thick, well-developed accumulation of polymictic conglomerates along the margins of the Miocene Suez and Plio-Pleistocene Dead Sea rifts, and thus indicating a major faulting phase and possibly an initial stage of rifting during Early-Middle Triassic times. Although an Upper Palaeozoic updoming prior to rifting may be considered, it is not a necessary postulate to explain the borehole data.





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