Wyniki wyszukiwania dla: Luis A. Parra-Avila

Pozycje od 1 do 8 spośród 8 wyników

artykuł

Zircon Megacrysts from the Kawisigamuwa Carbonatite, Sri Lanka – A Potential Reference Material for In Situ U‐Pb and Hf Isotope Measurement

Daniela Gallhofer, Etienne Skrzypek, Christoph Hauzenberger, Walter Kurz, więcej

Geostandards and Geoanalytical Research > 47 > 4 > 749 - 771

We characterise zircon megacrysts from the Kawisigamuwa carbonatite as a new potential reference material for laser ablation‐inductively coupled plasma‐mass spectrometry U‐Pb and Hf isotope measurement. We studied ten 0.5–4 cm long, brown megacrysts that consist of oscillatory zoned (OZ) and nearly featureless cathodoluminescence‐bright recrystallised (RX) zircon domains. The zircons have low to moderate...

artykuł

Zircon Hf and O-isotope constraints on the evolution of the Paleoproterozoic Baoulé-Mossi domain of the southern West African Craton

Luis A. Parra-Avila, Elena Belousova, Marco L. Fiorentini, Aurélien Eglinger, więcej

Precambrian Research > 2018 > 306 > C > 174-188

The use of zircon isotopic systems, such as Lu-Hf and O, has proven to be an invaluable tool for unraveling the evolution of the early Earth. In order to achieve a comprehensive understanding of the evolution of the southern West African Craton and, in particular, the Paleoproterozoic Baoulé-Mossi domain, zircon grains from 75 felsic intrusions were analyzed for Hf-isotopes; 22 of those samples were...

artykuł

The geochronological evolution of the Paleoproterozoic Baoulé-Mossi domain of the Southern West African Craton

Luis A. Parra-Avila, Anthony I.S. Kemp, Marco L. Fiorentini, Elena Belousova, więcej

Precambrian Research > 2017 > 300 > C > 1-27

Generation and emplacement of felsic magmas in the Paleoproterozoic Baoulé-Mossi domain, West African Craton does not match the apparent peaks of global crust generation identified between ca. 2900–2600, 1900–1600 and 1200–900Ma. In contrast, across the Baoulé-Mossi domain, the emplacement of felsic intrusions ranges from ca. 2300 to 2000Ma. It has proven difficult to place this magmatism within a...

artykuł

New insights into the crustal growth of the Paleoproterozoic margin of the Archean Kéména-Man domain, West African craton (Guinea): Implications for gold mineral system

Aurélien Eglinger, Nicolas Thébaud, Armin Zeh, James Davis, więcej

Precambrian Research > 2017 > 292 > C > 258-289

The Baoulé-Mossi Paleoproterozoic domain on the West African Craton is known for its world-class orogenic gold deposits formed during the Eburnean orogeny between ca. 2.15 and 2.07Ga. New results of U-Pb zircon dating in combination with Hf-isotope geochemical data indicate that a suite of mafic and felsic potassic plutonites were emplaced in Guinea (in vicinity to the Archean Kéména-Man domain, KMD)...

artykuł

Paleoproterozoic juvenile crust formation and stabilisation in the south-eastern West African Craton (Ghana); New insights from U-Pb-Hf zircon data and geochemistry

Sylvain Block, Lenka Baratoux, Armin Zeh, Oscar Laurent, więcej

Precambrian Research > 2016 > 287 > C > 1-30

The crust of the Paleoproterozoic West African Craton in northern Ghana is dominantly made of Tonalite-Trondhjemite-Granodiorite (TTG) suites, low-K to high-K calc-alkaline granites, with minor LILE-enriched diorites, and chemically related lavas. Results of zircon U-Pb dating indicate that all these different rock types were formed together over a prolonged period of ca. 100Ma, between 2.21 and 2...

artykuł

Geological setting of the Wassa gold deposit, SW Ghana

Stéphane Perrouty, Mark W. Jessell, Yan Bourassa, John Miller, więcej

Ore Geology Reviews > 2016 > 78 > C > 687-691

Including past production, current indicated and inferred resources, Wassa is a 5Moz poly-deformed early-orogenic gold deposit located on the eastern flank of the Ashanti Belt, in southwest Ghana. It is hosted by metamorphosed volcanic, intrusive and sedimentary rocks of the Sefwi Group (ca. 2260–2160Ma). Early mineralization has an Eoeburnean age (2164±22Ma, Re–Os on pyrite) and is characterized...

artykuł

Crustal evolution of the Paleoproterozoic Birimian terranes of the Baoulé-Mossi domain, southern West African Craton: U–Pb and Hf-isotope studies of detrital zircons

Luis A. Parra-Avila, Elena Belousova, Marco L. Fiorentini, Lenka Baratoux, więcej

Precambrian Research > 2016 > 274 > C > 25-60

The Paleoproterozoic Baoulé-Mossi domain of the southern West African Craton is regarded as the result of juvenile crust formation during the 2.3–1.9Ga period. However, little is known about the complex processes that led to the formation of this highly metal endowed lithospheric block. Hence, in order to better constrain its geodynamic evolution, small catchments within modern drainage basins of...

artykuł

Age constraints of the Wassa and Benso mesothermal gold deposits, Ashanti Belt, Ghana, West Africa

Luis A. Parra-Avila, Yan Bourassa, John Miller, Stéphane Perrouty, więcej

Journal of African Earth Sciences > 2015 > 112 > Part B > 524-535

The Ashanti Belt in Ghana hosts numerous multi-million ounce gold deposits and is one of the most richly gold endowed Paleoproterozoic belts of the West African Craton. This work shows that the Wassa mineralized intrusion is part of the Sefwi Group. This unit at Wassa is strongly magnetic and show a distinctly high response in regional magnetic data sets compared to other units of equivalent age within...

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