The association on the one hand, with carbonate wallrock and, on the other hand, with carbonatefree volcanicsedimentary wallrock is shown. Mcgnscon geological suruey of greenland, copenhagen, denmark enn brren mlson smithsonian institution, washington, d. Sedimentary exhalative sedex znpbsulfide mineralization first occurred on a large scale during the late paleoproterozoic. Geological survey usgs assessment of undiscovered mineral resources in the united states see ferrero and others, 2012.
Sedimentary exhalative deposits sedex deposits are ore deposits which are interpreted to. Geologic criteria for the assessment of sedimentary. Studies of the tectonic, sedimentary, and fluid evolution of modern and ancient sedimentary basins have also been used to select defining criteria. Pdf tourmaline in the metasedimentary country rocks of the. Department of geology, university of alabama, tuscaloosa, alabama 354871945. Metasedimentary article about metasedimentary by the. Mathscience nucleus 2001 1 sedimentary rocks teacher guide including lesson plans, student readers, and more information lesson 1 overview of sedimentary rocks lesson 2 classifying sedimentary rocks lesson 3 sand lab lesson 4 sedimentary rocks lab lesson 5 sandstones through time designed to be used as an electronic textbook. The recovery of fine cassiterite from metasedimentary rock 5 grinding needs to be conducted to get a high quality tin concentrate and a great loss of tin cannot be avoided when treating the ore by gravity concentration. Proterozoic sedimentary exhalative sedex deposits 171 sulfate. Proterozoic sedimentary exhalative sedex deposits and links. What links here related changes upload file special pages permanent link page. Detailed data on the deposits listed in table 11, including references, are available in appendix 1.
The recovery of fine cassiterite from metasedimentary rock. As a result, in aerial photographs, and locally even from a short distance away tens to hundreds of meters, these deposits are nearly indistinguishable from the bedrock pediment. Secondary sedimentary structure geology britannica. Synsedimentarydiagenetic fabrics of scheelite ores from the two scheelite deposits of felbertal and kleinarltal are described and illustrated. In contrast, the strictly greenstonehosted deposits lack a spatial relationship with the stype plutons ootes et al. Gabbroeclogite reaction rate and its geophysical significance. Metasedimentary article about metasedimentary by the free. Proterozoic sedimentary exhalative sedex deposits and. This report is a revised model for a specific type of cobaltcoppergold cocuau deposit that will be evaluated in the next u. Chemical sedimentary rocks are formed by direct chemical precipitation from water. Although the specifics of this deposit type are complex goodfellow et al. The sedimentaryexhalative meggen znpb sulfide and barite. Geological survey openfile report 9215a paper version and. Sedimentary exhalative deposits sedex deposits are ore deposits which are interpreted to have been formed by release of orebearing hydrothermal fluids into a water reservoir usually the ocean, resulting in the precipitation of stratiform ore sedex deposits are the most important source of lead, zinc and barite, a major contributor of silver, copper, gold, bismuth and tungsten.
Economic geology is a mixtum compositum of all geoscientific disciplines focused on one goal, finding new mineral depsosits and enhancing their exploi. These rocks form the basement on which the moine supergroup and torridonian sediments were deposited the moine supergroup consists of a thick and extensive sequence of neoproterozoic siliciclastic metasedimentary rocks, dominated by psammites with subordinate pelites mendum et al. Late tertiary basinfill deposits and younger quaternary surficial deposits dominate most of the region. Oct 11, 2019 geology, of a fault or fold that forms or grows within a sediment during sedimentation. Learn vocabulary, terms, and more with flashcards, games, and other study tools. This report is a broader synthesis of information on numerous cocuau deposits in metasedimentary rocks worldwide table 1 that share common geologic, mineralogical, and geochemical features. Sedimentary exhalative sedex usgs publications warehouse. Many of the deposits are noteworthy as possible resources of ag, bi, w, ni, y, ree, and or u. Sedimentary exhalative sedex type deposits syngenetic stratiform, bedded znpb deposits hosted by finegrained clastic sedimentary rocks. They are evaluated for the genesis of these mineralizations.
Finally, others like stromatolites and organic burrows and tracks, though they may in fact be primary, penecontemporaneous, or even secondary, may be grouped as a fourth categoryorganic sedimentary structures. Another submarine syngeneic sulphide deposits the sedimentary exhalative or sedex deposit. Australasian institute of mining and metallurgy, monograph series, 14. Metasediment definition is a metamorphic rock of sedimentary origin. Sedimentary rocks are created from the breakdown, transport, and reformation of all types of rocks found on earth. Ontario geological survey open file report 6064 geology and mineral potential of the puzzle lake area, central metasedimentary belt, grenville province by r. Pdf metasedimentary influence on metavolcanicrockhosted. A reconnaissance of all the deposits indicated that the cotopaxi mine is representative of this group, and a detailed investigation of this deposit constitutes the basis of this paper. When sedimentary rock is exposed to heat and pressure, what does it change into. Based on the above facts, a twostage separation, with a low intensity magnetic separator and a shaking table were.
The area is the continuation of the extensive wooded savannah of central. Large 1983 describes more subtle types of alteration near some deposits, including increased. Sedimentary rocks come in two or three categories, depending on what reference you use. Pdf tourmaline in the metasedimentary country rocks of. Characterizing shallow intrasedimentary faults using. Geologic criteria for the assessment of sedimentary exhalative. Because sediment gets buried, and if exposed gets eroded, older sedimentary rocks show less exposed outcrop area than.
Geology igneous, sedimentary, and metamorphic rock exam. The mineralogy of the wholerock was determined by xray powder diffraction xrd using a. Sedimentary exhalative sedex deposits are sulfidedominated pbzn ore bodies with sphalerite and galena as the principal ore minerals. The sedimentary exhalative meggen znpb sulfide and barite deposit, germany. Amagma must be weathered before it can change to metamorphic rock. If you would like to participate, you can choose to edit this article, or visit the project page for more information. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the u. Easton 2001 parts of this publication may be quoted if credit is given. Sedimentary rocks 01 university of north carolina at. In most textbooks, sedimentary rocks are clastic composed of fragments of other rocks and minerals, chemical precipitated directly from solution, or organic or biochemical, produced from biological processes. Texas state geology lab exam over igneous, sedimentary, and metamorphic learn with flashcards, games, and more for free. The ore is predominantly sphalerite, chalcopyrite, galena and pyrite. Cocuau deposits in metasedimentary rocks a preliminary. Sedex deposits are well known for the large amounts of sulfur they contain, which is present in proterozoic examples almost exclusively as pyrite, base metal sul.
Teacher guide including lesson plans, student readers, and. Significantly, the grouping in this report of cocuau deposits in metasedimentary rocks into a single model includes deposits that other workers. Characterizing shallow intrasedimentary faults using magnetic. Draft 1 1 sedimentary exhalative origin for magnetite deposits of the new jersey 2 highlands 3 peter matt, wayne powell, richard volkert, matthew gorring and al johnson 4 5 abstract 6 the new jersey highlands and contiguous hudson new york highlands host hundreds of 7 small, workedout magnetite mines, and the major zincoxide deposits of franklin and sterling. Geology and platetectonic setting explanatory notes a slide presentation and explanatory notes compiled in april 2005 by andreas g. Sedimentary exhalative sedex deposits account for more than 50 percent of. A descriptive model for silverleadzinc veins in clastic. Mineralogy and petrology of the metasedimentary rocks from. Microstructure of selected metamorphic rock types application 433 schist, and granitoids of cambroordovician age 480 fig. The association on the one hand, with carbonate wallrock and, on the other hand, with carbonatefree volcanic sedimentary wallrock is shown. When sedimentary rock is exposed to heat and pressure. A new genetic model for sedimentary exhalative ore deposits sedimentaryexhalative sedex deposits are one of the most.
Cmbbz is defined as central metasedimentary belt boundary zone geology very rarely. Pdf on may 23, 2014, erin elizabeth adlakha and others published tourmaline in the metasedimentary country rocks of the mcarthur river uranium deposit, saskatchewan find, read and cite all the. Sedimentology, volcanology and geodynamics of the redbank. This lesson focuses on the basics of sedimentary rocks and the extremely important role that weathering and erosion have in the rock cycle and the foundation of earths soils. Descriptive and geoenvironmental model for cocuau deposits. When sedimentary rock is exposed to heat and pressure, what. Students test the porosity and permeability of sand, gravel, and clay. This report draws on previous syntheses and basic research studies of sedimentary exhalative sedex deposits to arrive at the defining criteria, both descriptive and genetic, for sedextype deposits. Sedimentary exhalative origin for magnetite deposits of. Which characteristic of nonsedimentary rocks would provide the least evidence about the environment in which the rocks were formed.
Cmbbz stands for central metasedimentary belt boundary zone geology. Deformed barely recognizable fossils rounded grains clastic grains made up of fragments of other rocks clastic grains are mostly minerals crystalline randomly oriented crystals in hard rock large crystals in a groundmass with smaller crystals crystals that are easily scratchedbroken. It is recommended that reference to this publication be made in the following form. Metasediment definition of metasediment by merriamwebster. In 2008 an aeromagnetic survey of the great sand dunes region of the san luis valley was flown and the resulting data was used to conduct a preliminary study of the subsurface geologic framework. However, in the case of diatreme related deposits, such as the giant lowgrade abra deposit, the mineralization is intraformational, lacks sedimentary textures is epigenetic and replacement. In others, alteration is less extensive and or carbonaterich large, 1981. These three types may be considered as a spectrum of basemetal ore deposits which form in sedimentary rocks at some time during the evolution of a sedimentary basin. The southern grenville province consists of a series of distinct terranes that were juxtaposed during closure of an ocean basin leading up to and during the ultimate collision between laurentia and amazonia mclelland et al.
Bsediment must be compacted and cemented before it can change to sedimentary rock. Index map of colorado showing the location of eight precambrian mineral deposits. Other articles where secondary sedimentary structure is discussed. Sedimentary exhalative deposits sedex deposits are ore deposits that are interpreted to have been formed by release of orebearing hydrothermal fluids into a water reservoir usually the ocean, resulting in the precipitation of stratiform ore gu et al. This study encompasses the whole of the oracle junction 7. Emphasis is on providing an uptodate deposit model that includes both geologic and geoenvironmental aspects. These rocks form the basement on which the moine supergroup and torridonian sediments were deposited the moine supergroup consists of a thick and extensive sequence of neoproterozoic siliciclastic metasedimentary rocks, dominated by psammites with. The deposits are readily identified by the intimate associ ation of basemetal minerals with a complex coarse. Emsbo, poul, 2009, geologic criteria for the assessment of sedimentary exhalative sedex znpbag deposits. We analyzed fault systems and the distribution of sedimentary and volcanic rocks and their relation to the volcanosedimentary boron deposits. Newly recognized goldrich sedimentaryexhalative sedex mineralization in nevada, with an.
The primary goal of this study was to interpret the horizontal locations and depths of potential faults. These are very familiar in genesis to the vms deposits except they are not primarily driven by intrusions below but are instead products of dewatering and metamorphism of thick piles of accumulated sediments in ocean basins hence the sed part of the name, the exhalative portion of the name. How is central metasedimentary belt boundary zone geology abbreviated. A comparative study of selected geologic features from six classic districts, the kokanee range and keno hill, canada. Sedimentary exhalative deposits are widely distributed geographically from australia. Contains fossils footprints sedimentary deformed barely. In addition, the mudrocks are the protoliths precursor rock for aluminous metamorphic rocks, classification. Pdf proterozoic sedimentary exhalative sedex deposits. Petrogenesis and geochemistry of metabasaltic and metasedimentary enclaves in the amitsoq gneisses, west greenland v. These deposits contain material eroded from the granitic rocks and show very little topographic relief relative to the pediment. Sedimentary exhalative sedex ore deposits are the worlds largest znpb deposits.
C this article has been rated as cclass on the projects quality scale. But, they are important rocks because they are the most abundant sedimentary rocks, making up over 65% all sedimentary rocks, are likely the source rocks for petroleum and natural gas, and are sometimes valuable ore deposits. These deposits occur in marine sedimentary rocks rimming platform margins of. You will be redirected to the full text document in the repository in a few seconds, if not click here. Sedimentary exhalative deposits is part of wikiproject geology, an attempt at creating a standardized, informative, comprehensive and easytouse geology resource. Proterozoic sedimentary exhalative sedex deposits 171 sulfate sul. The chessboard classification scheme of mineral deposits. Impact of sedimentaryexhalative hydrothermal systems on marine. Sedimentary exhalative sedex zincleadsilver deposit model. Most deposits fit the model of having been formed late in the basin history and in most cases feeder systems and metal zonation support exhalative models. Information and translations of nonsedimentary in the most comprehensive dictionary definitions resource on the web. Cocu deposits in the blackbird mining district of central idaho. Cocuau deposits in metasedimentary rocks a preliminary report. Fluidmetasedimentary rock interactions in subductionzone.