Sedimentary exhalative origin for magnetite deposits of. Sedimentary exhalative deposits sedex deposits are ore deposits which are interpreted to have been formed by release of orebearing hydrothermal fluids into. Basin evolution and stratigraphic correlation of sedimentaryexhalative znpb deposits of the early cambrian zariganchahmir basin, central iran. Metalliferous sediments and sedimentary rockhosted stratiform. Lead may combine with p, as, and other elements to form. Another submarine syngeneic sulphide deposits the sedimentary exhalative or sedex deposit. Whilst the deposits in the idaho cobalt belt have been studied over many years the deposit types are still a subject of debate. Geologic criteria for the assessment of sedimentary. Pdf proterozoic sedimentary exhalative sedex deposits. Using a double screening, we merge metallogenic and heat flow distribution data in order to find the most. Deposit type, geological setting and style of mineralisation.
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the u. Sedimentary exhalative sedex type deposits syngenetic stratiform, bedded znpb deposits hosted by finegrained clastic sedimentary rocks. Sedimentary exhalative sedex deposits account for more than 50 percent. Proterozoic sedimentary exhalative sedex deposits and. British columbia mineral deposit profiles government of b. Pdf structural control on the formation of pbzn deposits. All major stratiform zincdominant deposits occur within rocks of the sag phase of the youngest isa. Global distribution of sedex zincleadsliver deposits with proportional symbol showing. Proterozoic sedimentary exhalative sedex deposits and links to evolving global ocean chemistry article pdf available in memoir of the geological society of america 198. Sedimentary exhalative sedex deposits consist of layers of leadzinciron sulfides which, as with. Diagrammatic cross section showing mineral zoning in sedimentary exhalative znpb deposits from briskey, 1986. Geologic criteria for the assessment of sedimentary exhalative.
Mississipi valleytype mvt, sedimentary exhalative polymetallic massive sulphides. 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. Mvt, sedimentary exhalative polymetallic massive sulphides sedex and the. Klein summary of relevant geologic, geoenvironmental, and geophysical information deposit geology. Emsbo, poul, 2009, geologic criteria for the assessment of sedimentary exhalative sedex znpbag deposits. Passive margins and riftrelated ore deposits include those known as.
Pdf pbzn deposits and specifically sedimentaryexhalative sedex deposits are frequently found in deformed andor metamorphosed. Prior to 2005 the overriding opinion was that the deposits are sedimentary exhalative and are referred to as the blackbird sediment hosted cuco. 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. 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. Sedimentary exhalative sedex usgs publications repository. Mississippi valleytype, sedimentary exhalative, irishtype or veintype deposits and, to lesser extent, pbzn skarns and rarely volcanichosted massive sulphide. Lead deposits are members of a class of ore deposits known as the hydrothermal deposits. Proterozoic sedimentary exhalative sedex deposits 171 sulfate sul. 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.
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