Development of cleavage in limestones of a fold-thrust belt in eastern New York

Stephen Marshak, Terry Engelder

Research output: Contribution to journalArticle

103 Citations (Scopus)

Abstract

Tectonic cleavage has developed in Lower Devonian limestones of the Hudson Valley Fold-Thrust Belt in New York State. Morphology and distribution of cleavage in these limestones is controlled by the amount of clay-quartz matrix present and by strain. Only limestones with greater than 10% clay-quartz matrix developed widespread cleavage. X-ray diffraction analyses indicate that the clay matrix was altered during deformation; the width of the 001 illite peak in cleaved lime wackestone is less than that in uncleaved lime wackestone from the same stratigraphic level. A minimum of 10% clay is necessary to provide interconnectivity between sites of dissolution and the free-fluid system. Preliminary analyses of bulk chemistry indicate that calcite is removed from the local rock system during cleavage development, supporting proposals that circulation of fluid through the rock plays a major role in the development of cleavage. Textural evidence suggests that both pressure solution and free-face dissolution contribute to the removal of ions at grain boundaries. Cross-cutting relations indicate that cleavage was initiated early during the development of the fold-thrust belt, but continued to develop during the late stages of folding.

Original languageEnglish (US)
Pages (from-to)345-359
Number of pages15
JournalJournal of Structural Geology
Volume7
Issue number3-4
DOIs
StatePublished - 1985

Fingerprint

cleavage
thrust
limestone
fold
clay
matrix
lime
dissolution
quartz
pressure solution
fluid
grain boundary
rock
illite
folding
calcite
X-ray diffraction
valley
tectonics
ion

All Science Journal Classification (ASJC) codes

  • Geology

Cite this

Marshak, Stephen ; Engelder, Terry. / Development of cleavage in limestones of a fold-thrust belt in eastern New York. In: Journal of Structural Geology. 1985 ; Vol. 7, No. 3-4. pp. 345-359.
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Development of cleavage in limestones of a fold-thrust belt in eastern New York. / Marshak, Stephen; Engelder, Terry.

In: Journal of Structural Geology, Vol. 7, No. 3-4, 1985, p. 345-359.

Research output: Contribution to journalArticle

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AU - Engelder, Terry

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