Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.apgeochem.2021.104935 |
Using stable isotopes of Cu, Mo, S, and 87Sr/86Sr in hydrogeochemical mineral exploration as tracers of porphyry and exotic copper deposits | |
Kidder, J. A.; Voinot, A.; Leybourne, M., I; Layton-Matthews, D.; Bowell, R. J. | |
通讯作者 | Kidder, JA (corresponding author), Queens Univ, Dept Geol Sci, Kingston, ON, Canada. |
来源期刊 | APPLIED GEOCHEMISTRY |
ISSN | 0883-2927 |
EISSN | 1872-9134 |
出版年 | 2021 |
卷号 | 128 |
英文摘要 | Groundwaters collected from the undisturbed Picaron Cu?Mo porphyry and exotic prospect (Atacama region, Chile) were analyzed for major and trace elements, along with isotopes of Cu, Mo, S, and 87Sr/86Sr. Sulfide minerals at Picaron have undergone oxidation by meteoric waters, resulting in the generation of acid and the lateral and downward migration of dissolved trace cations (Cd, Co, Cu, Ni, Pb, and Zn) and (oxy)anions (As, Mo, Sb, and Se). This paper presents a case study utilizing stable metal isotopes in hydrogeochemical mineral exploration to ascertain the possible hydrogeochemical footprints that can be detected around known mineralization. The groundwaters are weakly brackish (TDS < 3500 mg/L), reflected in relatively low trace metal concentrations. Despite this, the groundwaters reflect the dissolution of ore, as well as alteration and wall rock minerals proximal to porphyry mineralization with elevated dissolved concentrations of Ca, Mg, HCO3? , and SO42- . 865Cu values range from 0.41 to 2.80%o, with values above 1%o proximal to porphyry mineralization reflecting Cu fractionation during sulfide oxidation and the highest values (up to 2.80%o) proximal to exotic mineralization likely from Cu desorption. Downgradient, 865Cu values decrease; possibility resulting from adsorption of the heavier 65Cu onto reactive surfaces or mixing with other sources. 898Mo values proximal to porphyry mineralization (2.41 and 2.42%o) are much higher than the regional average for molybdenite reported in previous studies (0.11%o), suggesting acid neutralization and isotopic fractionation related to adsorption may be occurring close to the source. Much lower 898Mo values downgradient (<1.0%o) are likely indicative of Mo input from surrounding country rocks. The hydrogeochemical trends observed in the Picaron groundwaters highlight the chemical processes of mineral dissolution, precipitation, and recharge pathways and indicate that the leaching of the porphyry mineralization could be the source of exotic mineralization. Ultimately, the results indicate the need for a multiple isotope approach to hydrogeochemical mineral exploration. |
英文关键词 | Groundwater Porphyry-Cu Hydrogeochemistry Mineral exploration Ore deposit Trace elements Stable isotopes Non-traditional isotopes Chile Atacama |
类型 | Article |
语种 | 英语 |
收录类别 | SCI-E |
WOS记录号 | WOS:000647770800004 |
WOS关键词 | ATACAMA DESERT ; NORTHERN CHILE ; ROCK DRAINAGE ; WATER SOURCES ; EL SALVADOR ; WASTE-ROCK ; FRACTIONATION ; MOLYBDENUM ; ADSORPTION ; GROUNDWATERS |
WOS类目 | Geochemistry & Geophysics |
WOS研究方向 | Geochemistry & Geophysics |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/349490 |
作者单位 | [Kidder, J. A.; Voinot, A.; Leybourne, M., I; Layton-Matthews, D.; Bowell, R. J.] Queens Univ, Dept Geol Sci, Kingston, ON, Canada; [Voinot, A.; Leybourne, M., I] Queens Univ, Canadian Particle Astrophys Res Ctr, MacDonald Inst, Dept Phys Engn Phys & Astron, Stirling Hall,64 Bader, Lane, ON K7L 3N6, Canada |
推荐引用方式 GB/T 7714 | Kidder, J. A.,Voinot, A.,Leybourne, M., I,et al. Using stable isotopes of Cu, Mo, S, and 87Sr/86Sr in hydrogeochemical mineral exploration as tracers of porphyry and exotic copper deposits[J],2021,128. |
APA | Kidder, J. A.,Voinot, A.,Leybourne, M., I,Layton-Matthews, D.,&Bowell, R. J..(2021).Using stable isotopes of Cu, Mo, S, and 87Sr/86Sr in hydrogeochemical mineral exploration as tracers of porphyry and exotic copper deposits.APPLIED GEOCHEMISTRY,128. |
MLA | Kidder, J. A.,et al."Using stable isotopes of Cu, Mo, S, and 87Sr/86Sr in hydrogeochemical mineral exploration as tracers of porphyry and exotic copper deposits".APPLIED GEOCHEMISTRY 128(2021). |
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