Sedimentary exhalative sedex usgs publications repository. Whilst the deposits in the idaho cobalt belt have been studied over many years the deposit types are still a subject of debate. All major stratiform zincdominant deposits occur within rocks of the sag phase of the youngest isa. Sedimentary exhalative origin for magnetite deposits of. Proterozoic sedimentary exhalative sedex deposits and. Basin evolution and stratigraphic correlation of sedimentaryexhalative znpb deposits of the early cambrian zariganchahmir basin, central iran. Sedimentary exhalative sedex deposits consist of layers of leadzinciron sulfides which, as with. 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. Geologic criteria for the assessment of sedimentary exhalative. Proterozoic sedimentary exhalative sedex deposits and links to evolving global ocean chemistry article pdf available in memoir of the geological society of america 198. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the u. Sedimentary exhalative sedex deposits account for more than 50 percent.
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. Passive margins and riftrelated ore deposits include those known as. Lead deposits are members of a class of ore deposits known as the hydrothermal deposits. Sedimentary exhalative deposits sedex deposits are ore deposits which are interpreted to have been formed by release of orebearing hydrothermal fluids into. Metalliferous sediments and sedimentary rockhosted stratiform. Mvt, sedimentary exhalative polymetallic massive sulphides sedex and the. Pdf proterozoic sedimentary exhalative sedex deposits. Pdf pbzn deposits and specifically sedimentaryexhalative sedex deposits are frequently found in deformed andor metamorphosed. Mississippi valleytype, sedimentary exhalative, irishtype or veintype deposits and, to lesser extent, pbzn skarns and rarely volcanichosted massive sulphide. Deposit type, geological setting and style of mineralisation. Lead may combine with p, as, and other elements to form. 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. Diagrammatic cross section showing mineral zoning in sedimentary exhalative znpb deposits from briskey, 1986.
Volcanogenic massive sulfide ore deposit wikipedia. Another submarine syngeneic sulphide deposits the sedimentary exhalative or sedex deposit. Klein summary of relevant geologic, geoenvironmental, and geophysical information deposit geology. Sedimentary exhalative sedex type deposits syngenetic stratiform, bedded znpb deposits hosted by finegrained clastic sedimentary rocks. Pdf structural control on the formation of pbzn deposits. 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.
Emsbo, poul, 2009, geologic criteria for the assessment of sedimentary exhalative sedex znpbag deposits. Geologic criteria for the assessment of sedimentary. Global distribution of sedex zincleadsliver deposits with proportional symbol showing. British columbia mineral deposit profiles government of b. 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.
436 1258 109 1531 652 1049 336 494 422 694 29 1021 1029 147 1186 101 892 1072 564 897 566 1237 375 1331 346 186 205 619 607 787 606 778 1441 1113