The sedimentaryexhalative meggen znpb sulfide and barite. Proterozoic sedimentary exhalative sedex deposits 171 sulfate sul. By leia michele toovey exclusive to copper investing news. Proterozoic sedimentary exhalative sedex deposits and. Sedex is one of the worlds leading ethical trade service providers, working to improve working conditions in global supply chains. In spite of their scarcity, they are a large source of the worlds lead and zinc sedex deposits range in age from the midproterozoic that is 180 million years ago to the phanerozoic, 150 million years ago. In situ elemental compositions of sulfide minerals have been widely applied to trace oreforming processes of magmatichydrothermal ore systems, yet t. Pdf zncd ratios and cadmium isotope evidence for the. Mcqueen crc leme, australian national university, canberra, act 0200 and school of rehs, university of canberra, act 2601. 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 deposits account for more than 50 percent of the worlds zinc zn and lead pb reserves tikkanen, 1986 and furnish more than 25 percent of the worlds current production of these two metals and a significant amount of silver ag goodfellow and lydon, 2007. Diagrammatic cross section showing mineral zoning in sedimentary exhalative znpb deposits from briskey, 1986. Pdf proterozoic sedimentary exhalative sedex deposits.
We provide practical tools, services and a community network to help companies improve their responsible and sustainable business practices, and source responsibly. Sedimentary exhalative sedex zincleadsilver deposit model. Sedex is a global membership organisation that prides itself on making it simpler to do business thats good for everyone. Lady loretta, mcarthur river, mount isa, hyc, and broken hill australia. You will be redirected to the full text document in the repository in a few seconds, if not click here. Sedimentaryexhalative sedex type deposits syngenetic stratiform, bedded znpb deposits hosted by finegrained clastic sedimentary rocks. More than 129 deposits of this type have been recognized in. Proterozoic sedimentary exhalative sedex deposits and links to. 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. Structural control on the formation of pbzn deposits. Our introducing sedex brochure offers an overview of sedex, our products and services and the benefits of sedex membership. Proterozoic sedimentary exhalative sedex deposits and links to evolving global ocean chemistry article pdf available in memoir of the geological society of america 198. Pdf the distribution of sedex pbzn deposits through earth. Sedex sedimentaryexhalative deposits pdf, academic.
Evidence is presented that the gold, base metal, and barite contents of sedex deposits are dominantly controlled by the concentration and redox state of sulfur in basin brines. The majority of sedex deposits formed in intracontinental rifts or in passive. Sedex deposits account for more than 50 percent of the worlds zinc zn and lead pb reserves tikkanen, 1986 and furnish more than 25 percent of the worlds production of these two metals goodfellow and lydon, 2007. Pdf proterozoic sedimentary exhalative sedex deposits and. The brochure is available in english, spanish and chinese. Problem of course is that they are much less common. As you can see, sedex deposits are both much bigger than vms deposits and have better grades, making them highly desirable exploration target. Sedex, or sedimentary exhalative deposits, are ore deposits formed when hydrothermal fluids enter a water reservoir, such as an ocean.
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. Phanerozoic sedex deposits formed in its of the younger age group formed. Toward an integrated genetic model for ventdistal sedex deposits. Residual ore supergene ore surface deposits residual process. Geologic criteria for the assessment of sedimentary. Leadzinc deposits are often difficult to classify because clear criteria are lacking. Demo of social compliance documentation kit price 499 usd complete editable social compliance document kit procedures, sops, policy, social. Rickard, editor of mineralium deposita, was also most helpful. Pdf the emergence of sedex ores in the rock record at about 1. The biggest lead and zinc deposits in the world geology. Pdf ore deposit types and their primary expressions.
Greenstone belts, clarendon australian znpbag mineral systems. The season for the apparent change in tectonic setting of sedex deposits from. Part 7 of an 11 part series introducing ore deposit geology to nontechnical people. Pbzn deposits and specifically sedimentaryexhalative sedex deposits are frequently found in deformed andor metamorphosed geological terranes. Pdf the distribution of sedex pbzn deposits through earth history. In recent years, new tools, such as cd and zn isotopes, have been used to better understand the oreformation. Zncd ratios and cadmium isotope evidence for the classification of leadzinc deposits.
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