Throughgoing fractures in layered carbonate rocks

Michael R. Gross, Yehuda Eyal

Research output: Contribution to journalArticlepeer-review

69 Scopus citations

Abstract

Fracture surveys were conducted across a broad anticline in southern Israel in order to investigate the development and geometries of throughgoing fractures in layered carbonate rocks. At Halukim anticline, throughgoing fractures form by the linkage and coalescence of preexisting, bed-confined joints. Thus the internal morphology of these structures is highly segmented, often consisting of vertically aligned zones of subparallel fractures and bed partings linked together across the stratigraphy. The large population (n = 132) of throughgoing fractures represents a continuum of structures at various stages of development that can be classified into three main geometric categories corresponding to increasing levels of brittle strain: incipient, linked, and linked with aperture. Despite the wide variety of internal morphologies and geometries, the throughgoing fractures display a consistent east-north-east-west-southwest orientation, parallel to a set of bed-confined cross joints. The spatial distribution of throughgoing fractures varies as a function of structural position, the highest frequency and estimated strain intensity being located at the fold crest. Results suggest that throughgoing fractures develop only after a critical level of strain is achieved, as quantified by the density of bed-confined joints. Throughgoing fractures are multi-layer structures that may greatly enhance the connectivity of a fracture network; therefore, understanding their formation, geometry, and distribution may contribute to efforts of How modeling in fractured carbonate rocks.

Original languageEnglish
Pages (from-to)1387-1404
Number of pages18
JournalBulletin of the Geological Society of America
Volume119
Issue number11-12
DOIs
StatePublished - 1 Jan 2007

Keywords

  • Brittle deformation
  • Connectivity
  • Fracture zones
  • Fractures
  • Israel
  • Joints

ASJC Scopus subject areas

  • Geology

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