Zircon fingerprint of the Neoproterozoic North Atlantic: Perspectives from East Greenland

Olierook, Hugo K.H.; Barham, Milo; Kirkland, Christopher L.; Hollis, Julie; Vass, Anna

doi:10.1016/j.precamres.2020.105653

Cited by 23 publications

(21 citation statements)

References 184 publications

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“…9) also show a general absence of Archean detrital zircons and dominant peaks at c. 1750 and 1650 Ma but other Mesoproterozoic peaks are more pronounced than those for the Sleat-Torridon-Morar rocks and some units have 1100-1000 Ma peaks. This pattern is comparable to Megasequence 2 detrital age spectra derived from Greenland, Svalbard and Norway (see Olierook et al 2020). Youngest detrital zircons for Glenfinnan-Loch Eil-Badenoch groups (Fig.…”

Section: Glenfinnan-loch Eil-badenoch Groupssupporting

confidence: 80%

“…These ages and age spectra match well Megasequence 1 units in Greenland and Svalbard (Fig. 2), which also have a scarcity of Archean zircons and pronounced Paleoproterozoic clusters particularly around 1650 Ma (Olierook et al 2020). Renlandian metamorphism and magmatism at 960-920 Ma are common in rocks placed in Megasequence 1 and this event is now identified in Scotland by high-grade metamorphism at 950-940 Ma (Lu-Hf and Sm-Nd on garnet) from the Meadie Schist Formation near the stratigraphic base of the Morar Group (Bird et al 2018).…”

Section: Sleat-torridon-morar Groupssupporting

confidence: 73%

“…Taken together, these age constraints restrict deposition of the Sleat-Torridon-Morar rocks to 1000-950 Ma and place them firmly within Megasequence 1 (e.g. Olierook et al 2020).…”

Section: Sleat-torridon-morar Groupsmentioning

confidence: 95%

“…1. Geological setting of the North Atlantic region at c. 1000 Ma (simplified after Krabbendam et al 2017;Olierook et al 2020). Relative positions of Baltica, Laurentia and Amazonia after Li et al (2008).…”

Section: Basementmentioning

confidence: 99%

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A new stratigraphic framework for the early Neoproterozoic successions of Scotland

Krabbendam

Strachan

Prave

2021

JGS

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The circum-North Atlantic region archives three major late-Mesoproterozoic to Neoproterozoic tectonic episodes, the Grenville-Sveconorwegian and Renlandian orogenies followed by rifting and formation of the Iapetus Ocean, and each is bracketed by sedimentary successions that define three megasequences. In this context, we summarise sedimentological and geochronological data and propose a new stratigraphic framework for the iconic Torridonian-Moine-Dalradian successions and related units in Scotland. The Iona, Sleat, Torridon and Morar groups of the Scottish mainland and Inner Hebrides, and the Westing, Sand Voe and Yell Sound groups in Shetland, form the newly named Wester Ross Supergroup. They were deposited c. 1000–950 Ma within a foreland basin to the Grenville Orogen and, collectively, are in Megasequence 1. Some of these units record Renlandian orogenesis at c. 960-920 Ma. The newly named Loch Ness Supergroup consists of the Glenfinnan, Loch Eil and Badenoch groups of the Scottish mainland, deposited c. 900–870 Ma and are assigned to Megasequence 2. These units record Knoydartian orogenesis c. 820-725 Ma. The regionally extensive Dalradian Supergroup belongs to Megasequence 3; it was deposited c. <725-500 Ma and records the opening of the Iapetus Ocean, ultimately leading to deposition of the passive margin Cambrian-Ordovician Ardvreck and Durness groups.

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Section: Glenfinnan-loch Eil-badenoch Groupssupporting

confidence: 80%

Section: Sleat-torridon-morar Groupssupporting

confidence: 73%

“…Taken together, these age constraints restrict deposition of the Sleat-Torridon-Morar rocks to 1000-950 Ma and place them firmly within Megasequence 1 (e.g. Olierook et al 2020).…”

Section: Sleat-torridon-morar Groupsmentioning

confidence: 95%

Section: Basementmentioning

confidence: 99%

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A new stratigraphic framework for the early Neoproterozoic successions of Scotland

Krabbendam

Strachan

Prave

2021

JGS

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“…Comparative data sets from various sources indicated in the figure (Cawood et al, 2007a,b;Kirkland et al, 2009;Rehnström et al, 2010;Knudsen et al, 2011;Sláma et al, 2011). subpopulation (Cawood et al, 2007b;Rehnström et al, 2010;Sláma et al, 2011;Olierook et al, 2020). This abundance of Mesoproterozoic and Archean zircon grains, and crucial lack of a ca 2.0 to 1.8 Ga population distinguishes the older sedimentary successions from the samples analysed herein (Knudsen et al, 2011;Sláma et al, 2011).…”

Section: Zircon Provenance and Routingmentioning

confidence: 65%

Reduce or recycle? Revealing source to sink links through integrated zircon–feldspar provenance fingerprinting

et al. 2020

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The geochemical character of detrital mineral grains carries information that can be used to track sediment generation and transport within the broader context of basin development and crustal evolution. Many provenance studies focus on single minerals, which, as a consequence of different source fertility, survivorship and sediment sample representativeness, generate bias and consequently potentially skew geological interpretations. While a range of approaches has been proposed to either quantify or mitigate some of these biases, a significant limitation associated with the most commonly employed provenance proxy – zircon – remains that the grains are remarkably robust and capable of surviving numerous cycles of erosion, deposition and uplift. Here, same‐sample integration of zircon and feldspar provenance information is used to propose a sediment recycling metric ‘R’. This metric quantifies the degree of relative recycling of distinctive source components through comparison of provenance proxies with similar source region fertilities but different survivorship potential. This approach is applied to a case study of several thousand new zircon U‐Pb ages and K‐feldspar Pb‐isotope ratios from 25 Carboniferous to Palaeogene clastic samples from the poorly studied Wollaston Forland–Clavering Ø region in hydrocarbon prospective north‐east Greenland. Concordant detrital zircon populations are dominated by Palaeoproterozoic (ca 1.9 to 1.8 Ga) grains (>60%), with more minor Palaeozoic, Neo‐Mesoproterozoic and Archean subpopulations. Feldspar grain Pb‐isotope ratios almost entirely (>>60%) correspond to Caledonian granites (ca 0.4 Ga). Zircon and feldspar provenance proxies appear decoupled as a consequence of: (i) limited resolvable growth of zircon within Caledonian granites, and more importantly; (ii) significant upgrading of recycled zircon components via rift flanking sedimentary basins. Collectively, the integration of detrital mineral proxies with disparate survivorship potentials through sediment cycles (labile first cycle feldspar versus potentially polycyclic zircon) is essential to facilitate more nuanced definition of sediment source regions, routing pathways and basin evolution.

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Monazite in the eclogite and blueschist of the Svalbard Caledonides: its origin and forming-reactions

Kośmińska,

Fassmer,

McClelland

et al. 2023

Contrib Mineral Petrol

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High-pressure low-temperature rocks from Svalbard are an excellent target for studying metamorphic reactions in Phanerozoic subduction zones. This study reveals the presence of monazite in an eclogite and a blueschist from the Vestgötabreen Complex, southwestern Svalbard. In order to investigate the monazite-forming reaction, we obtained pressure–temperature estimates coupled with U–Pb and Lu–Hf dating. Combined geothermobarometry allows to constrain three evolutionary stages of garnet growth in the eclogite: nucleation (1.6 ± 0.3 GPa at 460 ± 60 °C), peak-pressure (2.3 ± 0.3 GPa at 507 ± 60 °C), and peak-temperature (2.1 ± 0.3 GPa at 553 ± 60 °C). A zircon age of 482 ± 10 Ma is interpreted to belong to the prograde part of the pressure–temperature path. Monazite forms inclusions within garnet rims, or it is surrounded by allanite and apatite, altogether forming pseudomorphs of a tabular shape in the matrix. Textures, geothermobarometry and geochronology support the conclusion the monazite formed under high-pressure conditions at 471 ± 6 Ma. We propose that the monazite crystallization in the eclogite happened due to a decomposition of accessory phases during the decompression after peak-pressure of the metamorphic cycle. Monazite in the blueschist occurs as inclusions in garnet cores and gives an indicative age of 486 ± 6 Ma, which is interpreted to reflect the prograde growth of the garnet. Lu–Hf garnet dating resolves an age of peak-pressure metamorphism in the blueschist at 471.1 ± 4 Ma under conditions of 2.0 ± 0.03 GPa and 500 ± 30 °C. The Vestgötabreen Complex provides evidence for an early Ordovician modern-style subduction system in the proximity of the Baltica margin. Hence, this study also supports the tectonic models that favour a mixed Baltican and Laurentian provenance of south-western Svalbard.

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Zircon fingerprint of the Neoproterozoic North Atlantic: Perspectives from East Greenland

Cited by 23 publications

References 184 publications

A new stratigraphic framework for the early Neoproterozoic successions of Scotland

A new stratigraphic framework for the early Neoproterozoic successions of Scotland

Reduce or recycle? Revealing source to sink links through integrated zircon–feldspar provenance fingerprinting

Monazite in the eclogite and blueschist of the Svalbard Caledonides: its origin and forming-reactions

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