Re-Os AGE OF THE PUEBLO VIEJO EPITHERMAL DEPOSIT, DOMINICAN REPUBLIC

Abstract

Research Article| March 01, 2014 Re-Os AGE OF THE PUEBLO VIEJO EPITHERMAL DEPOSIT, DOMINICAN REPUBLIC Jason D. Kirk; Jason D. Kirk † 1Department of Geosciences, University of Arizona, Tucson, Arizona 85721 †Corresponding author: e-mail, jdkirk@email.arizona.edu Search for other works by this author on: GSW Google Scholar Joaquin Ruiz; Joaquin Ruiz 1Department of Geosciences, University of Arizona, Tucson, Arizona 85721 Search for other works by this author on: GSW Google Scholar Stephen E. Kesler; Stephen E. Kesler 2Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, Michigan 48109 Search for other works by this author on: GSW Google Scholar Adam Simon; Adam Simon 2Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, Michigan 48109 Search for other works by this author on: GSW Google Scholar John L. Muntean John L. Muntean 3Nevada Bureau of Mines and Geology, Mail Stop 178, University of Nevada Reno, Reno, Nevada 89557-0178 Search for other works by this author on: GSW Google Scholar Author and Article Information Jason D. Kirk † 1Department of Geosciences, University of Arizona, Tucson, Arizona 85721 Joaquin Ruiz 1Department of Geosciences, University of Arizona, Tucson, Arizona 85721 Stephen E. Kesler 2Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, Michigan 48109 Adam Simon 2Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, Michigan 48109 John L. Muntean 3Nevada Bureau of Mines and Geology, Mail Stop 178, University of Nevada Reno, Reno, Nevada 89557-0178 †Corresponding author: e-mail, jdkirk@email.arizona.edu Publisher: Society of Economic Geologists Received: 22 Mar 2013 Accepted: 26 Aug 2013 First Online: 09 Mar 2017 Online ISSN: 1554-0774 Print ISSN: 0361-0128 © 2014 Society of Economic Geologists. Economic Geology (2014) 109 (2): 503–512. https://doi.org/10.2113/econgeo.109.2.503 Article history Received: 22 Mar 2013 Accepted: 26 Aug 2013 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Jason D. Kirk, Joaquin Ruiz, Stephen E. Kesler, Adam Simon, John L. Muntean; Re-Os AGE OF THE PUEBLO VIEJO EPITHERMAL DEPOSIT, DOMINICAN REPUBLIC. Economic Geology 2014;; 109 (2): 503–512. doi: https://doi.org/10.2113/econgeo.109.2.503 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyEconomic Geology Search Advanced Search Abstract Re-Os analyses of pyrite from the Pueblo Viejo high-sulfidation epithermal deposit (both Monte Negro and Moore ore zones) yield an isochron age of 111.9 ± 3.7 Ma and initial 187Os/188Os ratio of 0.22 ± 0.18 (mean square of weighted deviates = 84, n = 21). Isochrons grouped by pyrite setting (layered versus vein) or locations yield ages within uncertainty of the overall isochron and with each other and, as such, do not yield temporally distinguishable ages. Sphalerite vein samples as well as shale source rocks show evidence of open system behavior and loss of Re and therefore are not included in the above regression. These results confirm that the Pueblo Viejo deposit is Early Cretaceous in age and coeval with the volcanic Los Ranchos Formation, which hosts the deposit. Recent paleontological age assignments for the Hatillo Formation, which overlies the Los Ranchos Formation, show that it is only slightly younger, opening the possibility that mineralization in the Hatillo Formation could also be related to late stages of Los Ranchos magmatism. Whether these revised Los Ranchos-Hatillo relations provide sufficient cover to account for the paragenetically late formation of pyrophyllite at Pueblo Viejo remains unclear. Recognition that Pueblo Viejo is coeval with the Los Ranchos Formation shows that large-scale, high-sulfidation epithermal mineralization can form from basal island-arc tholeiitic magmatism. A review of available experimental data confirms that these magmas can generate hydrothermal solutions of the necessary composition; favorability of the Los Ranchos Formation might have been enhanced by its bimodal composition. These results suggest that exploration for epithermal precious metal deposits should include basal island-arc tholeiite terranes. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.