The magmatic–hydrothermal evolution of the San Pedro porphyry Cu‐(Mo) deposit: Implications for the metallogenesis of the Permian magmatism in the western margin of Gondwana

IF 1.1 4区 地球科学 Q3 GEOLOGY Resource Geology Pub Date : 2021-01-14 DOI:10.1111/rge.12251
A. Gómez, T. Ulrich, N. Rubinstein
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引用次数: 4

Abstract

The San Pedro porphyry Cu‐(Mo) deposit, located in the San Rafael Massif (Argentina), is characterized by multiple stockwork vein generations developed in a subvolcanic intrusion with porphyry‐type alteration and mineralization, as well as associated polymetallic veins. Previous works reveal that the intrusive rocks related to the San Pedro porphyry (263 Ma) show comparable trace element signatures to giant porphyry deposits elsewhere (i.e., high Sr/Y and low Y). The fluid inclusions investigated in this study show that typical early, high‐temperature magmatic fluids (up to 685°C; 81.3 wt% equiv. NaCl) evolved to lower‐temperature, moderately saline fluids (up to 454°C; 52.4 wt% equiv. NaCl) due to fluid–rock interaction. The waning stage of the system is characterized by secondary, aqueous inclusions that represent dilution by meteoric fluids (up to 390°C, 16.9 wt% equiv. NaCl). Fluid inclusions were studied from two veinlet generations (A and B veinlets) related to potassic alteration and analyzed by LA‐ICP‐MS. The trace element signatures in the fluid inclusions suggest that there were two pulses of magmatic fluids that subsequently evolved under similar physicochemical conditions. The Cu concentration in the earliest fluid is between 0.3 and 0.85 wt% and within the concentrations found in other mineralized porphyry systems in the world. However, in contrast to economic porphyry systems, where a significant change in Cu concentration during fluid evolution is observed, there is no distinct change in the fluid Cu concentration at the San Pedro deposit, which would indicate that Cu and Mo precipitation was ineffective in the hydrothermal system.
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圣佩德罗斑岩型铜(钼)矿床岩浆-热液演化:对冈瓦纳西缘二叠纪岩浆成矿作用的启示
圣佩德罗斑岩铜(钼)矿床位于阿根廷圣拉斐尔地块,其特征是在次火山侵入体中发育多代网状脉体,具有斑岩型蚀变和成矿作用,以及伴生的多金属脉体。以往的研究表明,与圣佩德罗斑岩(263 Ma)有关的侵入岩与其他地方的巨型斑岩矿床具有相似的微量元素特征(即高Sr/Y和低Y),本研究研究的流体包裹体显示典型的早期高温岩浆流体(高达685℃;81.3 wt%当量NaCl)演变为温度较低的中等含盐液体(高达454°C;52.4%当量NaCl),这是由于流体-岩石相互作用造成的。该体系衰退期的特征是次生的含水包裹体,代表了大气流体(高达390°C, 16.9 wt%当量NaCl)的稀释。研究了与钾蚀有关的两代静脉(A和B静脉)的流体包裹体,并通过LA - ICP - MS进行了分析。流体包裹体中的微量元素特征表明,在相似的物理化学条件下,存在两次岩浆流体脉冲。最早流体中Cu的浓度在0.3 ~ 0.85 wt%之间,与世界上其他矿化斑岩系统中的Cu浓度一致。然而,与流体演化过程中Cu浓度变化明显的经济斑岩体系不同,San Pedro矿床流体Cu浓度变化不明显,说明热液体系中Cu和Mo的沉淀是无效的。
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来源期刊
Resource Geology
Resource Geology 地学-地质学
CiteScore
2.30
自引率
14.30%
发文量
18
审稿时长
12 months
期刊介绍: Resource Geology is an international journal focusing on economic geology, geochemistry and environmental geology. Its purpose is to contribute to the promotion of earth sciences related to metallic and non-metallic mineral deposits mainly in Asia, Oceania and the Circum-Pacific region, although other parts of the world are also considered. Launched in 1998 by the Society for Resource Geology, the journal is published quarterly in English, making it more accessible to the international geological community. The journal publishes high quality papers of interest to those engaged in research and exploration of mineral deposits.
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