| Title: |
Geochemical and textural investigations of the Eoarchean Ukaliq supracrustals, Northern Québec (Canada) |
| Authors: |
Chowdhury, Wriju; Trail, Dustin; Guitreau, Martin; Bell, Elizabeth; Buettner, Jacob; Mojzsis, Stephen |
| Contributors: |
Department of Earth and Environmental Sciences Rochester; University of Rochester USA; Laboratoire Magmas et Volcans (LMV); Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Université Clermont Auvergne 2017-2020 (UCA 2017-2020 )-Centre National de la Recherche Scientifique (CNRS); Earth, Planetary and Space Sciences, University of California, Los Angeles, CA, USA; Hungarian Academy of Sciences (MTA); ANR-10-LABX-0006,CLERVOLC,Clermont-Ferrand centre for research on volcanism(2010); ANR-16-IDEX-0001,CAP 20-25,CAP 20-25(2016) |
| Source: |
ISSN: 0024-4937. |
| Publisher Information: |
CCSD; Elsevier |
| Publication Year: |
2020 |
| Collection: |
Université de Lyon: HAL |
| Subject Terms: |
thin section images; U-Pb geochronology and Lu-Hf isotopes; zircon; Hf isotopes; Lusingle bond; U-Pb geochronology; Silicon isotopes; Eoarchean; Ukaliq Supracrustal Belt; Inukjuak domain; [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
| Description: |
co-auteur étranger ; International audience ; Structural, geochronological and geochemical studies of pre-3.75 Ga rocks of volcano-sedimentary protoliths in the Inukjuak domain in the Superior Province in Québec have been mostly focused on the Nuvvuagittuq Supracrustal Belt (NSB). The Porpoise Cove outcrops – at the southwestern limit of the NSB – are the de-facto “type locality” for the supracrustals of the Inukjuak Complex. Yet, it remains unclear whether the NSB rocks are geochemically distinct from, or are in fact common to, a host of other supracrustal enclaves locked in the dominantly gneissic Inukjuak domain. Here, we report detailed textural and geochemical studies for a suite of rocks from the Ukaliq Supracrustal Belt (USB), located approximately 3 km northeast of the NSB. We find that the USB and NSB have a similar protracted metamorphic history; both experienced amphibolite grade metamorphism and contain granitoid gneiss sheets, quartz-magnetite rocks (banded iron-formation s.l.) and quartz-biotite schists within amphibolitized rocks of basaltic affinity with local retrogressions. If the various Inukjuak supracrustal belts were once a part of a larger coherent (now dismembered) terrane, they should show similar emplacement ages and source chemistry. New zircon Usingle bondPb geochronology from five gneissic units and two quartz-biotite (metasedimentary) schists reveal the oldest emplacement ages across all units of each individual rock type to be 3.68 ± 0.07 Ga (granitoid gneisses) and 3.65 ± 0.06 Ga (quartz-biotite schists). These new ages are similar to those documented as likely minimum emplacement ages of the NSB determined by Usingle bondPb geochronology. Zircons from the quartz-biotite schist were also analyzed by ion microprobe for their Usingle bondPb geochronology and were found to yield statistically identical, albeit more precise, ages than those obtained by LA-ICP-MS. Possible detrital zircons from the USB quartz-biotite schists were analyzed by ion microprobe for their coupled δ30SiNBS28 ... |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| DOI: |
10.1016/j.lithos.2020.105673 |
| Availability: |
https://uca.hal.science/hal-03101296; https://uca.hal.science/hal-03101296v1/document; https://uca.hal.science/hal-03101296v1/file/Chowdhury-postprint.pdf; https://doi.org/10.1016/j.lithos.2020.105673 |
| Rights: |
https://creativecommons.org/licenses/by-nc-nd/4.0/ ; info:eu-repo/semantics/OpenAccess |
| Accession Number: |
edsbas.1D0A4F02 |
| Database: |
BASE |