Intrusion-Associated Gold Systems and Multistage Metallogenic Processes in the Neoarchean Abitibi Greenstone Belt
نویسندگان
چکیده
In gold-endowed greenstone belts, ore bodies generally correspond to orogenic gold systems (OGS) formed during the main deformation stage that led craton stabilization (syntectonic period). Most OGS deposits postdate and locally overprint magmatic-hydrothermal systems, such as Au-Cu porphyry mostly magmatic (synvolcanic period) polymetallic intrusion-related (IRGS) of syntectonic period. Porphyries are associated with tonalite-dominated sanukitoid plutons, whereas most IRGS related alkaline magmatism. As reviewed here, intrusion-associated mineralization in Abitibi belt is result complex local multistage metallogenic processes. A new classification proposed includes (1) OGS-like dominated by metamorphic fluids, respectively; (2) may contain remobilized subsequent episodes; (3) overprinted OGS. Both crustal-scale faults display similar gold-deposition mechanisms. The difference fluid input increase oxidation state CO2 content mineralizing for deposits, while characterized circulation reduced fluids. For IRGS, fluids metals have a origin. defined base metal gold-bearing large-volume intrusions, signature can be small-volume intrusions. Some porphyry, Côté Gold deposit, demonstrate generate economically significant mineralization. addition, many evidence processes or gold-barren cases, source remains debated. Whether activity was essential marginal fertilizing upper crust Neoarchean major topic future research, petrogenetic investigations paramount distinguishing from barren belts.
منابع مشابه
Re-Os Abundance and Isotope Systematics of Al-undepleted Komatiites in the Kidd-Munro Assemblage: Results From Dundonald Beach, Abitibi Greenstone Belt, Canada
متن کامل
3.5-Ga hydrothermal fields and diamictites in the Barberton Greenstone Belt-Paleoarchean crust in cold environments.
Estimates of ocean temperatures on Earth 3.5 billion years ago (Ga) range between 26° and 85°C. We present new data from 3.47- to 3.43-Ga volcanic rocks and cherts in South Africa suggesting that these temperatures reflect mixing of hot hydrothermal fluids with cold marine and terrestrial waters. We describe fossil hydrothermal pipes that formed at ~200°C on the sea floor >2 km below sea level....
متن کاملThe Effect of Estimation Error on Risk-adjusted Bernoulli GEWMA Control Chart in Multistage Healthcare Processes
Background and objectives: Risk-adjusted Bernoulli control chart is one of the main tools for monitoring multistage healthcare processes to achieve higher performance and effectiveness in healthcare settings. Using parameter estimates can lead to significantly deteriorate chart performance. However, so far, the effect of estimation error on this chart in which healthcare ...
متن کاملDepositional and tectonic setting of the Archean Moodies Group, Barberton Greenstone Belt, South Africa.
The 3.22-3.10 Ga old Moodies Group, uppermost unit of the Swaziland Supergroup in the Barberton Greenstone Belt (BGB), is the oldest exposed, well-preserved quartz-rich sedimentary sequence on earth. It is preserved in structurally separate blocks in a heavily deformed fold-and-thrust belt. North of the Inyoka Fault, Moodies strata reach up to 3700 m in thickness. Detailed mapping, correlation ...
متن کاملProtoliths of the 3.8–3.7 Ga Isua greenstone belt, West Greenland
The Isua greenstone belt (Fig. 1) contains the oldest known, relatively well preserved, metavolcanic and metasedimentary rocks on Earth. The rocks are all deformed and many were substantially altered by metasomatism, but both the deformation and metasomatism were heterogeneous. Transitional stages can be seen from relatively well preserved primary volcanic and sedimentary structures to schists ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Minerals
سال: 2021
ISSN: ['2075-163X']
DOI: https://doi.org/10.3390/min11030261