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Re-Os and U-Pb geochronology of the Dona Amanda and Cerro Kiosko Deposits, Bayaguana District, Dominican Republic; looking down for the porphyry Cu-Mo roots of the Pueblo Viejo-type mineralization in the island-arc tholeiitic series of the Caribbean

Lisard Torro, Antoni Camprubi, Joaquin A. Proenza, Paulo Leon, Holly J. Stein, John F. Lewis, Carl E. Nelson, Cevero Chavez and Joan Carles Melgarejo
Re-Os and U-Pb geochronology of the Dona Amanda and Cerro Kiosko Deposits, Bayaguana District, Dominican Republic; looking down for the porphyry Cu-Mo roots of the Pueblo Viejo-type mineralization in the island-arc tholeiitic series of the Caribbean
Economic Geology and the Bulletin of the Society of Economic Geologists (June 2017) 112 (4): 829-853

Abstract

Hosted in the Early Cretaceous bimodal tholeiite volcanic series of the Los Ranchos Formation, the Dona Amanda and Cerro Kiosko deposits in the Bayaguana district represent significant Au, Cu, and Ag resources in the Cordillera Oriental of the Dominican Republic. At Dona Amanda, a dense stockwork of quartz-sulfide veins is hosted by volcanic rocks with intense transitional phyllic-advanced argillic and silicic hydrothermal alteration assemblages, indicating a high-sulfidation environment. Wavy quartz veins with central sutures and rims of pyrite + enargite + molybdenite + fahlore (B veins) are cut by planar quartz-pyrite D veins. Primary fluid inclusions in quartz from B veins (Th: 160 degrees ->400 degrees C; salinity: 7.9-16.4 wt % NaCl equiv) are interpreted as porphyry-type fluids. Inclusion fluids in quartz of quartz-pyrite veins (Th: 125 degrees -175 degrees C; salinity: 4.8-12.2 wt % NaCl equiv), quartz from silicic altered wall rocks (Th: 150 degrees -175 degrees C; salinity: 8.3-13.9 wt % NaCl equiv), and late, distal calcite veins (Th: 120 degrees -160 degrees C; salinity: 5.0-13.3 wt % NaCl equiv) indicate limited mixing with more dilute fluids and rule out mixing with fresh meteoric water. In Cerro Kiosko, a swarm of fault-controlled massive chalcopyrite + enargite + bornite + fahlore D veins and lodes are hosted by rocks with pervasive kaolinite alteration after sericite. delta (super 34) S values of vein sulfides from both deposits are all close to -2 ppm and consistent with a predominance of magmatic sulfur and sulfide deposition from an oxidizing magmatic fluid. These data are consistent with a transitional environment between a deeper porphyry Cu(-Mo) and an overlying high-sulfidation epithermal deposit. An Re-Os age (112.6 + or - 0.4 Ma) for molybdenite from the Dona Amanda deposit places the porphyry-epithermal mineralization as Early Cretaceous, coeval with the Los Ranchos Formation host rocks and with the Pueblo Viejo deposit. New sensitive high-resolution ion microprobe U-Pb ages on zircons from plagioclase-phyric rhyolite domes in the Bayaguana district are consistent with porphyry-high-sulfidation epithermal mineralization occurring along the Los Ranchos Formation during tonalite batholith emplacement in the basaltic island-arc basement at ca. 118 to 112 Ma and finalization of felsic volcanism at ca. 110 to 107 Ma.


ISSN: 0361-0128
EISSN: 1554-0774
Coden: ECGLAL
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 112
Serial Issue: 4
Title: Re-Os and U-Pb geochronology of the Dona Amanda and Cerro Kiosko Deposits, Bayaguana District, Dominican Republic; looking down for the porphyry Cu-Mo roots of the Pueblo Viejo-type mineralization in the island-arc tholeiitic series of the Caribbean
Affiliation: Universitat de Barcelona, Departament de Mineralogia, Petrologia i Geologia Aplicada, Barcelona, Spain
Pages: 829-853
Published: 201706
Text Language: English
Publisher: Economic Geology Publishing Company, Lancaster, PA, United States
References: 102
Accession Number: 2017-048174
Categories: Economic geology, geology of ore depositsGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. cols., 5 tables, geol. sketch maps
N17°30'00" - N20°00'00", W72°00'00" - W68°19'60"
Secondary Affiliation: Universidad Nacional Autonoma de Mexico, MEX, MexicoCorporacion Minera Dominicana, DOM, Dominican RepublicColorado State University, USA, United StatesGeorge Washington University, USA, United StatesRecursos del Caribe, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Society of Economic Geologists. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201726
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