Field mapping and laboratory observation may establish the current geometry and give constraints on the kinematics, i. Nabanita gupta, shell oil company summary woodford shale exhibits complex geophysical features. Riedel shears are a pair of strikeslip faults that form so that their acute bisector forms parallel to the direction of the maximum compressive stress, illustrated in the transpression model in figure 7. The lithosphere lithosphere is comprised of the upper mantle and the. Structural geology attempts to unravel the deformation history that led to the often quite complicated structures now observed in mountain belts. The updated preliminary structural interpretation identifies the riedel vein system as the primary structural control on gold mineralization at the f2 gold deposit. The process of 3d structural geological modeling, also referred to as 3d mapping moeck et al. Structural controls and origin of goldsilver mineralization in the grampian terrane of scotland and ireland volume 151 issue 6 p. Riedel shear control on the development of pennant veins. Core data will be also incorporated to the study for facies, diagenesis, and fracture analysis. The preliminary structural interpretation simplifies.
At an early stage of the development of the deformation zone, synthetic shear fractures riedel shears within the clay slab display dilatational behaviour. The development of a 3d structuralgeological model as. The earth is composed of layers of different composition and physical properties, principally the solid central core, the fluid peripheral core, the viscous mantle, and the solid. Abstract riedel shear structures are common fault patterns identified within shear zones and related to the embryonic stages of fault formation. Strikeslip experiments using gypsum powder structural. Once in a while, an extraordinarily superior book appears in the midst of other good books on a subject. Fault slip data will provide input for stress inversion. Pdf riedelshear control on the development of pennant veins. Riedel shear zones are typically interpreted in relation to deformation in cover rocks above a single discrete strikeslip fault zone. This study focuses on the geometry of outcropscale natural shear zones consisting of different generations of riedel structures, exposed in the jurassic navajo sandstone, capitol reef national park, utah. Geometry and kinematic evolution of riedel shear structures. The place of structural geology in sciences science is the search for knowledge about the universe, its origin, its evolution, and how it works. Riedel s fracture kinematic model with dextral strikeslip adamawa shear zone as the main shear zone during late stage of the panafrican collision.
Riedel shear structures within the coseismic surface rupture zone. These zones of brittle deformation often contain characteristic deformation structures which allow for the sense of shear to be determined for both actively deforming and historic zones of deformation. For a given structural position the curvature will be equal for all beds but the thickness, elastic properties and tensile strength might. Deformation in the earths brittle upper crust results in the formation of both fault and shear zones.
Read a kinematic model for deformation within brittle shear zones, journal of structural geology on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Key takeaways from the preliminary structural interpretation. Most downloaded journal of structural geology articles. The structural 3d geological model will be validated by well and seismic data. Models using analogue materials such as clay and sand have revealed a fairly consistent faulting. Undeformed and deformed strain marker reference used for derivation of formulae. A model is a selfconsistent framework providing a coherent explanation for the. Several asymmetric shear sense indicators have been described and utilized by previous workers to study ductile e. Rbycf rubicon or the company provides an updated preliminary interpretation of the structural geology of the f2 gold deposit the preliminary structural interpretation at the phoenix gold project the project. A clay slab represents the sedimentary cover above a strikeslip fault in the rigid basement. Structural geology of the colorado plateau region of southern utah, with special. Seismic attribute delineation of lineaments and reservoir. Structual geology and resources 2012 l structural controls to. Rey the place of structural geology in sciences science is the search for knowledge about the universe, its origin, its evolution, and how it wo.
Structural assessment and 3d geological modeling of the. A riedel model for leftslip movement and new structural and stereonet data aid in this interpretation. Structural geology by haakon fossen cambridge core. Characterizing a faultzone and associated fractures using. Orthogonal compression is an uncommon ore setting despite the overall compressional nature of magmatic arcs. Stereographic projection involves plotting 3d data. Geometry and kinematic evolution of riedel shear structures, capitol reef national park, utah pdf. The results demonstrate that the coseismic riedel shear structures are primarily controlled by the local geology during surface rupture formation, consistent with the idea that riedel shear structures are common fault patterns within strikeslip shear zones and that their development is related to the early stages of fault evolution. The move suite provides a platform for integrating and interpreting data, crosssection construction, 3d model building.
Primarily strikeslip, riedel shears do have associated with them a small. Most outstanding, the book provides a balance between soft rock and hard rock, discusses the fields relevance to basic and applied applications, and. Riedel shear structures in the coseismic surface rupture. Tectonics activity and volcanism influence to the garut. Referring to the riedel shear model of the structure, reactivation of both faults formed secondary structures that are e tensional. In sw amazon craton, along the boundary between the ventuaritapajos 1.
Preliminary structural study of the goldbearing shear. Rubicon minerals corporation rubicon minerals provides. Structural geology, tectonics and geodynamics form a coherent and interdependent. An investigation into the role of fault interaction on fold pattern, journal of structural geology, vol. The most downloaded articles from journal of structural geology in the last 90 days. Conjugate riedel deformation band shear zones, journal of. Riedel shears are normally the first subsidiary fractures to occur and generally build the most prominent set. Note the development of riedel shear fractures before a through going fracture develops. In this movie, a layer of gypsum powder is subjected to strikeslip deformation. The lithosphere lithosphere is comprised of the upper mantle and the crust, the outer shell of the earth. Strikeslip tectonics is concerned with the structures formed by, and the tectonic processes associated with, zones of lateral displacement within the earths crust or lithosphere. The move suite is the most complete structural modelling and analysis toolkit available. Bethune1 1 department of geology, university of regina, regina, saskatchewan with over one million ounces of gold produced since 1991, the seabee deposit, owned and. Introduction to stereonets a stereonet is a lower hemisphere graph on to which a variety of geological data can be plotted.
Joints will develop when ssurf tl meets the tensile strength of the bed, t. They develop at an acute angle, typically 1020 clockwise to a dextral main fault, anticlockwise to a sinistral strikeslip fault. Preliminary results 3d model riedel shear fracture network oblique, rightlateral sense of shear main shear, ns trending red. Pdf geometry and kinematic evolution of riedel shear. Riedel shear structures are common fault patterns identified within shear zones and related to the embryonic stages of fault. Structural control on alteration distribution of high sulfidation epithermal deposit at cijulang prospect, garut, west java. Download the understanding the publishing process pdf. Riedelshear control on the development of pennant veins. The tertiary rocks deposited in the pullapart basin are folded and faulted in a structurally complex manner. Conjugate riedel deformation band shear zones geosciences.
Sinistral strikeslip fault cibuni fault, citando fault. Typical pullapart structures were created in scaled clay experiments with a pure strikeslip geometry riedel type experiments. Geometry and kinematic evolution of riedel shear structures, capitol reef national park, utah. Characterizing a faultzone and associated fractures using lab experiments and attributebased seismic analysis.
Local structures in the field area include leftlateral strike. Simple shear, pure shear and general shear, part 1 by prof. Structural control on alteration distribution of high. Abrasion anoxic event astronomy atoll banded iron formation. Readers will also be drawn by the scientific value of recently. Without a doubt, this is ht case with this introductory structural geology work by fossen. Preliminary structural analysis of the dugald river znpb. Read conjugate riedel deformation band shear zones, journal of structural geology on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
Structural geology a regional foliation and lineation external to the auriferous shear zones. Field example and analogue modelling sara coelho a, cees passchier a, fernando marques b a department of earth sciences, university of mainz, becherweg 21, 55099 mainz, germany b department of geology and cgul, university of lisbon, lisbon, portugal received 1 december 2005. Pdf overlying fold shape purple contours depends on. Structural relationship between brittle deformation and. Pdf geometry and kinematic evolution of riedel shear structures. Geometry and kinematic evolution of riedel shear structures, capitol reef national park, utah article pdf available in journal of structural geology 263. Stereonets are used in many different branches of geology and can be used in a range of ways beyond those which are discussed here see references for further uses. Geology of the 10vein outcrop, seabee mine, saskatchewan. A kinematic model for deformation within brittle shear zones.
Formation of compound strikeslip fault zones, mount abbot. Seismic attribute delineation of lineaments and reservoir compartmentalization dollarhide field method unocal has provided a 3d seismic survey of the field acquired in the late 1980s, and well logs to calibrate the seismic. It provides a full digital environment for best practice structural modelling to reduce risk and uncertainty in geological models. Dugald river structural geology complex deformation history during isan orogeny.
501 1232 621 888 1221 538 296 1366 1215 146 1046 1170 468 405 807 1063 105 50 1373 1439 628 1488 1477 487 1481 594 1323 1179 934 772 299 1268 1460