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Deformation of Helderberg Limestones above the Blind Thrust System of the Central Appalachians

Theodore J. Meyer and William M. Dunne
The Journal of Geology
Vol. 98, No. 1 (Jan., 1990), pp. 108-117
Stable URL: http://www.jstor.org/stable/30068228
Page Count: 10
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Deformation of Helderberg Limestones above the Blind Thrust System of the Central Appalachians
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Abstract

Helderberg limestones have been subjected to late-burial solution and layer-parallel shortening by cleavage formation with twinning. They also record deformation during passive macrofolding due to emplacement of the underlying blind thrust system including: passive cleavage rotation during flexural flow, perhaps by grain-boundary sliding; cleavage intensification in gentle fold limbs; and cleavage dilation in steep limbs by cleavage-normal untwinned calcite fibers. Cleavage dilation was the second dilation event as bedding solution structures were previously opened with bedding-normal fiber growth during layer-parallel shortening. Thus, pre-existing solution structures were commonly exploited as fluid conduits and precipitation sites.

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