U-Pb, Re-Os, and 40Ar/39Ar geochronological constraints on the Cerros Taguas deposit, northern El Indio belt (29°S): implications for the timing of high-sulfidation and porphyry-style mineralization

IF 4.4 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Laura Maydagán, María Agustina Cócola, David Selby, Andrea Montoya, Federico Mateos, Martín Gonzalo Vallejos, Sergio Palma, Guillermo Delle Vedove, Raúl Alvarez Cifuentes
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引用次数: 0

Abstract

Cerros Taguas is one of the high-sulfidation epithermal Au-Ag deposits (131.35 Mt @ 0.29 g/t Au, 8.8 g/t Ag, 0.11% Cu) of the Taguas project, located in the northern sector of the El Indio belt (~ 29°S), Central Andes, Argentina. Zircon LA-ICP-MS U-Pb dating of a rhyolitic tuff that hosts Au-Ag mineralization constrain the timing of volcanism to the middle Miocene (12.14 ± 0.14 to 11.85 ± 0.26 Ma). Above 3800 m.a.s.l., the rocks display advanced argillic alteration, characterized by alunite + pyrophyllite + dickite ± diaspore ± topaz. Hypogene alunite associated with epithermal Au-Ag mineralization yielded a 40Ar/39Ar plateau date of 9.5 ± 0.4 Ma. Below 3800 m.a.s.l., the presence of sericitic alteration (muscovite + illite + quartz) and a molybdenum halo associated with molybdenite-bearing B-type and pyrite ± quartz D-type veins suggests a transition from epithermal to porphyry-style mineralization. Molybdenite in quartz-dominated B-type veins and molybdenite ± quartz veins cross-cutting the rhyolitic tuff yielded ID-NTIMS Re-Os dates of 10.60 ± 0.06 and 10.48 ± 0.05 Ma. A nominally older molybdenite ID-NTIMS Re-Os date (11.10 ± 0.11 Ma) was obtained for the hydrothermal cement of a breccia. The timing of molybdenum mineralization at Cerros Taguas was broadly coeval with the emplacement of inter-mineralization porphyritic stocks and slightly older than molybdenite mineralization in the nearby Valeriano and El Encierro porphyry deposits. The occurrence of a porphyry-style mineralization at Cerros Taguas reflects the prospectivity for porphyry deposits beneath Miocene-age volcanic rocks and advanced argillic alteration zones in the northern sector of the El Indio belt.

Abstract Image

埃尔因迪奥带北部(南纬 29°)Cerros Taguas 矿床的 U-Pb、Re-Os 和 40Ar/39Ar 地质年代约束:对高硫化和斑岩型成矿时间的影响
Cerros Taguas 是 Taguas 项目的高硫化热液型金银矿床(1.3135 亿吨,金品位 0.29 克/吨,银品位 8.8 克/吨,铜品位 0.11%)之一,位于阿根廷中安第斯山脉 El Indio 带北部(南纬 29 度左右)。锆石 LA-ICP-MS U-Pb 测定显示,金银矿化物所在的流纹凝灰岩的火山活动时间为中新世中期(12.14 ± 0.14 至 11.85 ± 0.26 Ma)。在海拔 3800 米以上,岩石显示出晚期的镁质蚀变,其特征为白云母+辉绿岩+屌石±透辉石±黄玉。与热液型金银矿化有关的下成岩褐铁矿产生的 40Ar/39Ar 高原年代为 9.5 ± 0.4 Ma。在海拔 3800 米以下,出现了绢云母蚀变(绢云母+伊利石+石英)和与含辉钼矿的 B 型和黄铁矿+石英 D 型矿脉相关的钼晕,这表明矿化已从表生型过渡到斑岩型。以石英为主的 B 型矿脉中的辉钼矿和横切流纹凝灰岩的辉钼矿±石英矿脉的 ID-NTIMS Re-Os 时间分别为 10.60 ± 0.06 和 10.48 ± 0.05 Ma。一个角砾岩热液胶结物的辉钼矿 ID-NTIMS Re-Os 时间(11.10 ± 0.11 Ma)要早一些。Cerros Taguas 的钼矿化时间与矿化间斑岩储量的形成时间大致相同,略早于附近 Valeriano 和 El Encierro 斑岩矿床的钼矿化时间。Cerros Taguas 的斑岩型矿化现象反映了 El Indio 矿带北部地区中新世时期火山岩和晚期镁质蚀变带下斑岩型矿床的前景。
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来源期刊
Mineralium Deposita
Mineralium Deposita 地学-地球化学与地球物理
CiteScore
11.00
自引率
6.20%
发文量
61
审稿时长
6 months
期刊介绍: The journal Mineralium Deposita introduces new observations, principles, and interpretations from the field of economic geology, including nonmetallic mineral deposits, experimental and applied geochemistry, with emphasis on mineral deposits. It offers short and comprehensive articles, review papers, brief original papers, scientific discussions and news, as well as reports on meetings of importance to mineral research. The emphasis is on high-quality content and form for all articles and on international coverage of subject matter.
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