{"id":2360,"date":"2019-10-02T19:50:21","date_gmt":"2019-10-02T19:50:21","guid":{"rendered":"https:\/\/www.gsnv.org\/shop\/implications-of-stratabound-carlin-type-gold-deposits-in-paleozoic-rocks-of-north-central-nevada\/"},"modified":"2020-02-24T18:17:14","modified_gmt":"2020-02-24T18:17:14","slug":"implications-of-stratabound-carlin-type-gold-deposits-in-paleozoic-rocks-of-north-central-nevada","status":"publish","type":"product","link":"https:\/\/www.gsnv.org\/shop\/implications-of-stratabound-carlin-type-gold-deposits-in-paleozoic-rocks-of-north-central-nevada\/","title":{"rendered":"Implications of stratabound Carlin-type gold deposits in Paleozoic rocks of north-central Nevada"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"<p>On the basis of mineralogical-geochemical data and related implications, as well as<br \/>\ngeneral geological considerations, SEDEX gold accumulations in the Great Basin might<br \/>\nhave been a Paleozoic precursor event in many Carlin-type gold deposits whose origins<br \/>\nsubsequently were masked because of multiphase Mesozoic and Cenozoic tectonism and<br \/>\nmagmatism. This paper examines important geological characteristics that relate to<br \/>\ninferred formation of primary stratiform and (or) stratabound SEDEX disseminated<br \/>\ngold accumulations in Carlin-type deposits of north-central Nevada, and that correspond<br \/>\nto well-developed models of polymetallic SEDEX deposits. The latter provide the fundamental<br \/>\ncriteria for a filtering of the entire population of more than 100 Carlin-type<br \/>\ndeposits in the Great Basin in order to select those deposits that are considered to have<br \/>\nremnants of synsedimentary features. Three filters were used to screen Carlin-type gold<br \/>\ndeposits: (1) their occurrence in epicratonic sedimentary strata with or without growth<br \/>\nfaults, (2) predominant absence of Mesozoic and Cenozoic intrusive rocks in the deposit<br \/>\nvicinity, and (3) presence of stratabound type of mineralization comprised of conformable<br \/>\ntabular, lenticular, and ribbon-shaped ore bodies associated with feeder channels.<br \/>\nSequential application of these three filters results in 25 Carlin-type deposits that<br \/>\nmight contain evidence of synsedimentary gold mineralization. These deposits are<br \/>\nevenly distributed in the Jerritt Canyon district and along an approximately 300-kmlong<br \/>\nNW belt including the Carlin trend and the southern part of the Battle Mountain-<br \/>\nEureka trend. The selected group includes only stratabound deposits that are<br \/>\npresent in Paleozoic autochtonous or parautochthonous sedimentary strata belonging<br \/>\nto the eastern assemblage carbonate platform in east-central Nevada, in spite of<br \/>\nwidespread lithological and facies diversity in these host rocks. These deposits clearly<br \/>\ncontain volumetrically significant, well-developed stratabound disseminated gold<br \/>\nmineralization and are minimally disturbed by faults and (or) magmatic effects.<br \/>\nComparative examination of the settings of the 25 deposits shows a steady southward<br \/>\nstratigraphic ascent of mineralized sequences from Upper Ordovician and Lower<br \/>\nSilurian Hanson Creek Formation to Early and Late Mississippian Joana Limestone<br \/>\nand Chainman Shale, involving an inferred mineralizing time span from 460 to 325<br \/>\nMa. In addition, the Carlin and Battle Mountain-Eureka trends parallel the general<br \/>\ndrift direction of North America (Laurentia plate) during 400 to 325 Ma. Local and<br \/>\nregional time-stratigraphic features compared with data on paleocontinental movements<br \/>\nappear to corroborate the assumption that original sedimentary-exhalative<br \/>\n(SEDEX) gold ore-forming processes might have been initiated by hot spot activity\u2014<br \/>\ni.e., the stratabound Carlin-type deposits themselves suggest a specific Paleozoic hot<br \/>\nspot that initiated failed amagmatic rifting and related synsedimentary gold influx<br \/>\ninto a basin at the western margin of the craton.<\/p>\n","protected":false},"featured_media":4295,"comment_status":"closed","ping_status":"closed","template":"","meta":{"pmpro_default_level":""},"product_cat":[154],"product_tag":[],"_links":{"self":[{"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/product\/2360"}],"collection":[{"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/comments?post=2360"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/media\/4295"}],"wp:attachment":[{"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/media?parent=2360"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/product_cat?post=2360"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/product_tag?post=2360"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}