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dc.contributor.advisorFletcher, Raymond C.
dc.contributor.advisorLogan, Joah
dc.creatorPatton, Thomas Lewi
dc.descriptionThirteen illustrations in pocket.en
dc.description.abstractComparisons of field, experimental, and theoretical data on the deformation in a sedimentary layer due to movement on an underlying, pre-existing basement fault, provide the basis for a conceptual normal-fault model in such a layer. Initial displacement along a 70(DEGREES) basement normal fault generates arcuate maximum-compressive-stress and shear-fracture trajectories immediately above the basement-fault tip. Their concave surface face the downthrown (hanging-wall) side of the layer. Both a region of low mean stress (compression positive) and high differential stress also overlie the basement-fault tip, providing optimal conditions for failure. Failure occurs by stress release along shear-fracture trajectories, resulting in short, upward-steepening normal faults which may obtain a reverse sense of separation before dieing out toward the downthrown side of the layer. Re-establishment of similar states of stress with continued basement-fault movement produces a series of nested, arcuate fault segments merging to a common surface or surfaces which ultimately comprise the through-going normal-fault system. Once such a system is established, the inactive smaller segments are preserved in the hanging wall. Additional faulting occurs to accommodate compression and extension associated with translation along the nonplanar, through-going fault. Monoclinal folding in the upper portions of the layer accompanies fault development at depth. The fold is slightly asymmetric with a narrower upper hinge and a wider lower hinge. The monocline tends to develop toward the side of the layer over the basement footwall. Narrow, steeper limbed monoclines associated with the upward-propagating fault tip may be superposed on the larger, earlier formed one. Once the through-going fault has fragmented the monocline, the hanging-wall limb may continue to steepen or may develop reverse drag with subsequent fault translation depending on whether the through-going fault steepens or shallows with depth.en
dc.format.extentx, 165 leavesen
dc.rightsThis thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use.en
dc.subject.classification1984 Dissertation P322
dc.subject.lcshGeological mappingen
dc.subject.lcshGeological modelingen
dc.subject.lcshFaults (Geology)en
dc.subject.lcshFolds (Geology)en
dc.titleNormal-fault and fold development in sedimentary rocks above a pre-existing basement normal faulten
dc.typeThesisen A&M Universityen of Philosophyen D. in Philosophyen
dc.contributor.committeeMemberFriedman, Melvin
dc.contributor.committeeMemberJohnson, Brann
dc.contributor.committeeMemberSharman, George
dc.format.digitalOriginreformatted digitalen
dc.publisher.digitalTexas A&M University. Libraries

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