Abstract
A multidisciplinary provenance study was conducted on stream sediment samples from major rivers in the eastern part of Labrador, Canada (Fig. 1). The purpose was to fingerprint the sources that deliver material to the stream sediments and to the reservoir sand units deposited off shore in the sedimentary basins in the Labrador Sea. We used a multimineral U-Pb geochronological approach employing rutile and titanite in addition to zircon to obtain unbiased age data. The purpose of this was to characterise the different igneous and metamorphic episodes that occurred in Labrador, which is an area with highly variable geology characterised by the Palaeoproterozoic south-eastern Churchill province in the north-west, the Archaean Nain plutonic suite in the north-east, the Palaeoproterozoic Makkovik province in the east and the Mesoproterozoic Grenville Province to the south. The field work was carried out in 2012 and 2013 and the study is a collaborative project between the Geological Survey of Denmark and Greenland and the Geological Survey of Newfoundland and Labrador. In this paper we focus on three samples from the southern part of the study area where two parts of the Grenville orogeny are found (Fig. 1).
Highlights
A multidisciplinary provenance study was conducted on stream sediment samples from major rivers in the eastern part of Labrador, Canada (Fig. 1)
The emphasis on U-Pb geochronology has primarily been on detrital zircon, as it typically provides precise age information of the source rocks
Zircon is not usually the mineral of choice for dating the history of rocks with a complex tectonothermal evolution, as it typically survives most processes occurring in the rock cycle from sedimentation to high grade metamorphism and often even magmatic processes
Summary
A multidisciplinary provenance study was conducted on stream sediment samples from major rivers in the eastern part of Labrador, Canada (Fig. 1). Zircon is not usually the mineral of choice for dating the history of rocks with a complex tectonothermal evolution, as it typically survives most processes occurring in the rock cycle from sedimentation to high grade metamorphism and often even magmatic processes.
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More From: Geological Survey of Denmark and Greenland Bulletin
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