Duration of Hydrothermal Alteration and Mineralization of the Don Manuel Porphyry Copper System, Central Chile
The Don Manuel porphyry copper system, located in the Miocene–Pliocene metallogenic belt of central Chile, contains spatially zoned alteration styles common to other porphyry copper deposits including extensive potassic alteration, propylitic alteration, localized sericite-chlorite alteration and ar...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-02-01
|
| Series: | Minerals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-163X/11/2/174 |
| _version_ | 1797412758231187456 |
|---|---|
| author | Amy K. Gilmer R. Stephen J. Sparks Dan N. Barfod Emily R. Brugge Ian J. Parkinson |
| author_facet | Amy K. Gilmer R. Stephen J. Sparks Dan N. Barfod Emily R. Brugge Ian J. Parkinson |
| author_sort | Amy K. Gilmer |
| collection | DOAJ |
| description | The Don Manuel porphyry copper system, located in the Miocene–Pliocene metallogenic belt of central Chile, contains spatially zoned alteration styles common to other porphyry copper deposits including extensive potassic alteration, propylitic alteration, localized sericite-chlorite alteration and argillic alteration but lacks pervasive hydrolytic alteration typical of some deposits. It is one of the youngest porphyry copper deposits in the Andes. Timing of mineralization and the hydrothermal system at Don Manuel are consistent with emplacement of the associated intrusions (ca. 4 and 3.6 Ma). Two molybdenite samples yielded consistent ages of 3.412 ± 0.037 and 3.425 ± 0.037 Ma. <sup>40</sup>Ar/<sup>39</sup>Ar ages on hydrothermal biotites (3.57 ± 0.02, 3.51 ± 0.02, 3.41 ± 0.01, and 3.37 ± 0.01 Ma) are associated with potassic alteration. These ages are younger than the youngest intrusion by ~300 k.y. recording the cooling of the system below 350 °C. Such a time gap can be explained by fluxing of hot magmatic fluids from deeper magmatic sources. |
| first_indexed | 2024-03-09T05:07:55Z |
| format | Article |
| id | doaj.art-44def947a0e24af4988a6275743c9b97 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-09T05:07:55Z |
| publishDate | 2021-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-44def947a0e24af4988a6275743c9b972023-12-03T12:53:05ZengMDPI AGMinerals2075-163X2021-02-0111217410.3390/min11020174Duration of Hydrothermal Alteration and Mineralization of the Don Manuel Porphyry Copper System, Central ChileAmy K. Gilmer0R. Stephen J. Sparks1Dan N. Barfod2Emily R. Brugge3Ian J. Parkinson4U.S. Geological Survey, Denver, CO 80225, USASchool of Earth Sciences, University of Bristol, Wills Memorial Building, Bristol BS8 1RJ, UKNatural Environment Research Council Argon Isotope Facility, Scottish Universities Environmental Research Centre, East Kilbride G75 0QF, UKSchool of Earth Sciences, University of Bristol, Wills Memorial Building, Bristol BS8 1RJ, UKSchool of Earth Sciences, University of Bristol, Wills Memorial Building, Bristol BS8 1RJ, UKThe Don Manuel porphyry copper system, located in the Miocene–Pliocene metallogenic belt of central Chile, contains spatially zoned alteration styles common to other porphyry copper deposits including extensive potassic alteration, propylitic alteration, localized sericite-chlorite alteration and argillic alteration but lacks pervasive hydrolytic alteration typical of some deposits. It is one of the youngest porphyry copper deposits in the Andes. Timing of mineralization and the hydrothermal system at Don Manuel are consistent with emplacement of the associated intrusions (ca. 4 and 3.6 Ma). Two molybdenite samples yielded consistent ages of 3.412 ± 0.037 and 3.425 ± 0.037 Ma. <sup>40</sup>Ar/<sup>39</sup>Ar ages on hydrothermal biotites (3.57 ± 0.02, 3.51 ± 0.02, 3.41 ± 0.01, and 3.37 ± 0.01 Ma) are associated with potassic alteration. These ages are younger than the youngest intrusion by ~300 k.y. recording the cooling of the system below 350 °C. Such a time gap can be explained by fluxing of hot magmatic fluids from deeper magmatic sources.https://www.mdpi.com/2075-163X/11/2/174porphyry copper deposithydrothermal alterationmineralizationthermal modelinggeochronologyChile |
| spellingShingle | Amy K. Gilmer R. Stephen J. Sparks Dan N. Barfod Emily R. Brugge Ian J. Parkinson Duration of Hydrothermal Alteration and Mineralization of the Don Manuel Porphyry Copper System, Central Chile Minerals porphyry copper deposit hydrothermal alteration mineralization thermal modeling geochronology Chile |
| title | Duration of Hydrothermal Alteration and Mineralization of the Don Manuel Porphyry Copper System, Central Chile |
| title_full | Duration of Hydrothermal Alteration and Mineralization of the Don Manuel Porphyry Copper System, Central Chile |
| title_fullStr | Duration of Hydrothermal Alteration and Mineralization of the Don Manuel Porphyry Copper System, Central Chile |
| title_full_unstemmed | Duration of Hydrothermal Alteration and Mineralization of the Don Manuel Porphyry Copper System, Central Chile |
| title_short | Duration of Hydrothermal Alteration and Mineralization of the Don Manuel Porphyry Copper System, Central Chile |
| title_sort | duration of hydrothermal alteration and mineralization of the don manuel porphyry copper system central chile |
| topic | porphyry copper deposit hydrothermal alteration mineralization thermal modeling geochronology Chile |
| url | https://www.mdpi.com/2075-163X/11/2/174 |
| work_keys_str_mv | AT amykgilmer durationofhydrothermalalterationandmineralizationofthedonmanuelporphyrycoppersystemcentralchile AT rstephenjsparks durationofhydrothermalalterationandmineralizationofthedonmanuelporphyrycoppersystemcentralchile AT dannbarfod durationofhydrothermalalterationandmineralizationofthedonmanuelporphyrycoppersystemcentralchile AT emilyrbrugge durationofhydrothermalalterationandmineralizationofthedonmanuelporphyrycoppersystemcentralchile AT ianjparkinson durationofhydrothermalalterationandmineralizationofthedonmanuelporphyrycoppersystemcentralchile |