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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract

DOI:10.1306/11051010026

Quantification of fold curvature and fracturing using terrestrial laser scanning

Mark A. Pearce,1 Richard R. Jones,2 Steven A. F. Smith,3 Kenneth J. W. McCaffrey4

1Geospatial Research Ltd., Department of Earth Sciences, University of Durham, Durham, DH1 3LE, United Kingdom; mark@geospatial-research.co.uk
2Geospatial Research Ltd., Department of Earth Sciences, University of Durham, Durham, DH1 3LE, United Kingdom; richard@geospatial-research.co.uk
3Istituto Nazionale di Geofisica e Vulcanologia (INGV), Via di Vigna Murata, 605, 00143 Roma, Italy; steven.smith@ingv.it
4Geospatial Research Ltd., Department of Earth Sciences, University of Durham, Durham, DH1 3LE, United Kingdom; present address: Department of Earth Sciences, University of Durham, Durham, DH1 3LE, United Kingdom; k.j.w.mccaffrey@dur.ac.uk

ABSTRACT

Terrestrial laser scanning is used to capture the geometry of three single folded bedding surfaces. The resulting light detection and ranging (LIDAR) point clouds are filtered and smoothed to enable meshing and calculation of principal curvatures. Previous HitFractureNext Hit traces, picked from the LIDAR data, are used to calculate Previous HitfractureNext Hit densities. The rich data sets produced by this method provide statistically robust estimates of spatial variations in Previous HitfractureNext Hit density across the fold surface. The digital nature of the data also allows resampling to derive Previous HitfractureNext Hit parameters that are more traditionally measured manually from outcrops (e.g., one-dimensional line transects of Previous HitfractureNext Hit spacing). The Previous HitfractureNext Hit statistics derived from the LIDAR data are compared with the calculated principal and Gaussian curvatures of the surface to assess whether areas of extreme curvature correlate with high-Previous HitfractureNext Hit density. For the folds studied, all the Previous HitfractureNext Hit spacing distributions showed an exponential distribution, and no significant correlation between Previous HitfractureNext Hit density and surface curvature was observed. This questions the validity of using curvature as a proxy for high brittle strains and highlights the need for a complete understanding of fold and Previous HitfractureNext Hit mechanics that include considerations of other factors including lithology, strain rate, and confining pressure, not just finite strain. The three case studies also illustrate how terrestrial laser scanning can be used to gather detailed quantitative data sets on Previous HitfractureTop and fold distributions from outcrop analogs.

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