Polymetallic vein and replacement deposits are characterized by elevated abundances of pbzncuauagmoas bisb. Journal of structural geology vol 10, issue 5, pages 437. Veins are classically thought of as being the result of. Structural geology of dpit at akara mining, pichit. Introduction to structural geology structural geology is the study of how rocks deform and the processes of deformation. Introduction to field mapping of geologic structures geol 429 field geology department of earth sciences montana state university dr. The online text combines fundamentals, observations and applications and differs significantly from most textbook offerings in this area by a novel and intuitive integration of content. The hydraulic flow involved is usually due to hydrothermal circulation.
Further investigation of the structural state of adularia reveals that each group has some specific features in terms of the degree of alsi disordering, which. Look at deformation history of individual linesplanes. Osterwald abstract uraniumbearing veins in the united states are principally fissurefilling deposits in faults, joints, or fracture zones that. Detailed geological mapping of the rice lake mine trend. Structural geology notebook sigmoidal tension gashes. Structural geology and fracture analysis of grotto canyon. The geological and structural position and localization conditions of the vein type pbzn deposits of the sadon north ossetia and east karamazar north tajikistan ore districts are considered. Reference system a geological structures are represented by one or more lines or planes. High regional uplift rates and shallow formation of veins indicate a maximum age of vein minerali sation of about i.
Undeformed and deformed strain marker reference used for derivation of formulae. A single deformation may produce several sets of lineations with different orientations within a given foliation plane. Introduction to structural geology school of earth and. Structural geology and vein mineralisation in the callery. B a line can be defined in threedimensional space by its angle with three orthogonal axes. The deposits consist of auriferous quartzvein systems. A plane can be represented by its normal, which itself is a line. Sedimentary rocks are the most studied by structural geologists because the initial shape. Pdf geometry and development of vein systems in the plymouth. The deposits consist of auriferous quartz vein systems. Cosgrove journal of structural geology 32 2010 192201 193 crackjump mechanism proposed bycaputo and hancock 1999.
Pdf on mar 20, 2019, ian honsberger and others published structural geology of a goldbearing quartz vein system. Veins form when mineral constituents carried by an. Quartz can replace country rock, whether directly or through the intermediary of carbonate, but in aluminous rocks such replacement does not normally extend far from the channelways in which solutions flow. Detailed structural study of these goldbearing zones on the antler gold inc.
Vein structures and intrastratal microfractured zones interpreted in. For example, in a metalbearing vein system the hotter veins may contain high temperature copperbearing sulphide minerals like bornite, while less hot veins. Veins form when mineral constituents carried by an aqueous solution within the rock mass are deposited through precipitation. Force a push or pull acting upon an object that causes a body to accelerate fma measured in newtons n 1n is the force required to accelerate 1kg by 1ms2 force is a vector. Introduction to structural geology laurel goodwin basil tikoff paul riley structural geology vs. Tectonics tectonics how earth was built broader than structural geology encompassing study of surface to core including disciplines as diverse as paleontology and geophysics structural geology deformation processes integral part of tectonics, particularly in respect to deformation history over. Editorial for special issue structural control of mineral. Current research 2019 newfoundland and labrador department of natural resources geological survey, report 191, pages 2338 structural geology of a goldbearing quartz vein system. Veins are components of the cardiovascular system, which circulates blood to provide nutrients to the cells of the body. Polymetallic vein and replacement deposits models 19a and. Powerpoint presentation introduction to structural geology. One could say that veins are structures that reveal a deformation history for structural.
Ribbon structure in gold quartz veins economic geology. Oct 20, 2018 a vein is an elastic blood vessel that transports blood from various regions of the body to the heart. The crystalline structure of the vein rock and the surrounding mass is usually quite similar and there may be no finegrained edges to the veins. Massive vein and breccias vein cut through the host rock with veinlet or strockwork kromkham and zaw, 2005. Geology and hydrothermal vein system of the jachymov. Structural geology and vein mineralisation in the callery river headwaters, southern alps, new zealand d. Lineations due to ductile deformation lay on foliation planes and are, therefore, as penetrative as foliations.
Senior consultant structural geology, srk uk principal areas of expertise. The other three types of stress, tension, compression and shear, are nonuniform, or directed, stresses. The leading role of longlived deep faults in the control of large deposits is emphasized. In geology, a vein is a distinct sheetlike body of crystallized minerals within a rock.
One type of stress is uniform, which means the force applies equally on all sides of a body of rock. Start studying structural geology final brittle deformation. Pdf calcite veins in the paving slabs outside plymouth city. Journal of structural geology xxx 2012 1e16 3 please cite this article in press as.
They typically occur in a branching network of injection veins stemming from the fault zone into the usually crystalline wall rock. While carrying out a regional structural analysis of deformation band shear zones in southern utah, davis 1994, 1996 discovered welldeveloped outcrop and mapscale riedel shear zones in outcrops of navajo sandstone jurassic. The following conclusions result from field and laboratory studies of meso and hypothermal vein matter in many widely separated districts. One could say that veins are structures that reveal a deformation history for. Unlike the high pressure arterial system, the venous system is a low pressure system that relies on muscle contractions to. All rocks in the earth experience a uniform stress at all. In sw amazon craton, along the boundary between the ventuaritapajos 1. Part one of a brief introduction to joints, veins, plumose structures, joint arrays, joint sets, joint systems, exfoliation, sheeting joints, columnar jointing and other various terminology and. A lineation may be a primary igneous or sedimentary fabric element, such as an array of elongate kfeldspar. Journal of structural geology vol 118, pages 90 january. Jan 25, 2018 whereas dykes and sills are forms of igneous rock and do not change compositionally over a temperature range, veins have a very distinct temperature controlled mineralogy and morphology. In most rock masses the discontinuities form planes of weakness or surfaces of separation, including foliation and bedding joints, joints, fractures, and zones of crushing or shearing. The third and most important goal was to produce a predictive model that can be used to locate. With continued deformation the veins will fracture, fold and boudinage.
Structural evolution, vein orientation, and paragenesis of. Geology of uraniumbearing veins in the conterminous united states structural control of uraniumbearing vein deposits and districts in the conterminous united states by frank w. Structural geology particularly concerned with is lineations produced by deformation. Regional setting the rice lake greenstone belt is located in the.
They are generally s or zshaped, depending on the sense of shear along the zone. Type 3 veins consist of quartz, calcite, and adularia deposited from low salinity water which may have boiled at about 240c. These veins indicate that the pseudotachylite was in a fluid state. Geology and structural features of veintype lead and zinc. The role of preexisting veining in the localization of. The glassy matrix, which contains rock inclusions and microscopic spherulites, attests that the vein was abruptly chilled. Balanced crosssections and the fracture data analysis were used to look for correlations that are not consistent with the surface structural geometries. Pdf on mar 20, 2019, ian honsberger and others published structural geology of a goldbearing quartz vein system, wilding lake region, central newfoundland find, read and cite all the research.
Structural control of uraniumbearing vein deposits and. Structual geology and resources 2012 43 l keynote structural controls to, and exploration for, epithermal auag deposits greg corbett structural controls to, and exploration for, epithermal auag deposits greg corbett introduction structural controls to the formation of epithermal auag deposits within magmatic arc extending into back arc. Examples of such deposits in different provinces are given. A distal, manganeseenriched zone is present in some districts. Geology fundamentals veins, dikes and sills geology for. The black hills of south dakota are a structural dome. Dyke rocks, which feature porphyritic and aphanitic dyke, arise through the volcanic.
The role of preexisting veining in the localization of auriferous vein systems. Sigmoidal tension gashes form along zones of ductile shear. Learn vocabulary, terms, and more with flashcards, games, and other study tools. This type of extensional fracture is usually mineralfilled and form en echelon arrays along the shear zone. Structural geology, tectonics and geodynamics form a coherent and.
This model suggests that the botija deposit has undergone postmineral northwestsoutheast extension, which is responsible for its atypical elongate geometry. Structural geology, age, and mechanisms of gold vein formation at. Deformation is the change in shape, position andor volume of an object in response to applied forces. In some districts, ore proximal to igneous intrusions is copper and gold rich, and grades laterally and sometimes vertically into leadzincsilverrich ore. It is closely related to the concept of strain the permanent change in shape in 1d, 2d or. A threedimensional geologic model of botija was constructed from alteration, vein, assay, and structural data collected from field mapping and drill core logging. Mesoscopic structures field investigation and diamond core showed crosscut relationship among each of structures. Analysis of the pre, syn, and postmineralization structures reveals that a similar deformation regime, with.
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