{"id":2486,"date":"2019-10-02T19:54:17","date_gmt":"2019-10-02T19:54:17","guid":{"rendered":"https:\/\/www.gsnv.org\/shop\/forensic-geochemical-approaches-to-constrain-the-source-of-au-ag-in-low-sulfidation-epithermal-ores\/"},"modified":"2020-02-24T18:17:52","modified_gmt":"2020-02-24T18:17:52","slug":"forensic-geochemical-approaches-to-constrain-the-source-of-au-ag-in-low-sulfidation-epithermal-ores","status":"publish","type":"product","link":"https:\/\/www.gsnv.org\/shop\/forensic-geochemical-approaches-to-constrain-the-source-of-au-ag-in-low-sulfidation-epithermal-ores\/","title":{"rendered":"\u201cForensic\u201d geochemical approaches to constrain the source of Au-Ag in low-sulfidation epithermal ores"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"<p>In order to better constrain genetic processes involved in forming mineral deposits<br \/>\n(and ultimately exploration models), it helps to know from where the metals of interest<br \/>\nare derived. How the metals arrived at their point of deposition, and why they<br \/>\nwere deposited there, are separate issues.We are using three different techniques in an<br \/>\nattempt to better understand these processes for epithermal ores. All have some ambiguity<br \/>\ninherent to them, but we think that based on our preliminary investigations, together<br \/>\nthey point to a new understanding of howsome epithermal ores in the northern<br \/>\nGreat Basin form. These techniques include: 1) plotting the relative abundances ofAu,<br \/>\nAg, Pb, As, Sb, Se, Te of the ores; 2) Pb-isotope abundances in Au-Ag minerals; and 3)<br \/>\nRe-Os isotope analyses of Au-Ag minerals in the ores. Results to date suggest: 1) the<br \/>\n\u201cepithermal suite\u201d geochemical association is likely related to the similar volatility of<br \/>\nthese metal(loid)s, and thus we conclude they are derived fromthe mantle as opposed<br \/>\nto representing a shalloworigin; and 2) Preliminary Pb and Re-Os isotopic analyses of<br \/>\nAu-Ag minerals indicate that they are derived fromthe mafic that were part of the bimodal<br \/>\nvolcanic suite associated with the initial emergence of the Yellowstone Hotspot<br \/>\n(YHS) in the northernGreat Basin at about 16-15 Ma. Epithermal ore formation associated<br \/>\nwith theYHSwhich may suggest the source region of the mantle was rapidly depleted.<\/p>\n","protected":false},"featured_media":4548,"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\/2486"}],"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=2486"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/media\/4548"}],"wp:attachment":[{"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/media?parent=2486"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/product_cat?post=2486"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/product_tag?post=2486"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}