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