The extent of juvenile crust in the Grenville Province: Nd isotope evidence

Dickin, A. P.; McNutt, Robert H.; Martin, Chris; Guo, Anlin

doi:10.1130/b26381.1

Cited by 56 publications

(43 citation statements)

References 41 publications

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“…At present, we interpret this source to the Caledonian magmatic rocks in the Uppermost Allochthon to be a hidden terrane or, alternatively, associated with known 1.70 -1.75 Ga source rocks from Laurentia, such as the Labradoria terrane in northeastern North America (e.g. Dickin et al 2010). Notably, the latter explanation would require large sinistral displacement of both terranes of the Uppermost Allochthon in Scandinavia and of allochthonous rocks in East Greenland.…”

Section: Proterozoic To Palaeozoic Metasedimentary Sequencesmentioning

confidence: 87%

Early Ordovician to Silurian evolution of exotic terranes in the Scandinavian Caledonides of the Ofoten–Troms area – terrane characterization and correlation based on new U–Pb zircon ages and Lu–Hf isotopic data

Augland

Andresen

Gasser

et al. 2013

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Isotope dilution thermal ionization mass spectrometry U-Pb dating and coupled Lu-Hf solution inductively coupled plasma mass spectrometry analyses of zircon were acquired from magmatic rocks along two transects across the Scandinavian Caledonides in the TromsOfoten region of Norway to explore possible correlations and gain insight into the evolution of far-travelled nappes within the Upper and Uppermost Allochthons. One pulse of magmatic activity was recorded at c. 489 Ma in the Tromsø Nappe. In the underlying Nakkedal Nappe, a magmatic pulse was recorded at c. 450 Ma, being contemporaneous with eclogite facies metamorphism in the area. Tonalites in the structurally underlying Lyngen and Gratangseidet ophiolitic complexes, both forming the substratum to carbonate -schist-quartzite sequences (Balsfjord and Evenes groups, respectively), yielded ages of 481 and 474 Ma. Obtained 1 Hf(t) values are, however, distinctly different and indicate a juvenile origin for the Gratangseidet tonalite (1 Hf(474) ¼ + 9.57) and the presence of Palaeoproterozoic source material for the Lyngen tonalite (

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Section: Proterozoic To Palaeozoic Metasedimentary Sequencesmentioning

confidence: 87%

Early Ordovician to Silurian evolution of exotic terranes in the Scandinavian Caledonides of the Ofoten–Troms area – terrane characterization and correlation based on new U–Pb zircon ages and Lu–Hf isotopic data

Augland

Andresen

Gasser

et al. 2013

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“…They are typically calc-alkaline granodiorites to tonalities. Their Nd isotopic compositions (Dickin, 2000;Dickin et al, 2010) and lack of inherited older zircons indicates significant juvenile components. These rocks evidently formed in a subduction setting, for otherwise they would have had the characteristics of a continental arc (e.g., inherited older zircons, older Nd model ages).…”

Section: Key Observationsmentioning

confidence: 98%

Mesoproterozoic-trans-Laurentian magmatism: A synthesis of continent-wide age distributions, new SIMS U–Pb ages, zircon saturation temperatures, and Hf and Nd isotopic compositions

Bickford

Schmus

Karlstrom

et al. 2015

Precambrian Research

170

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“…As a result of a data collection program throughout the province spanning more than two decades, Dickin and co-workers have shown that grey orthogneiss can be 'mapped' into domains of different depleted mantle (T DM ) model age inferred to represent discrete times of magma extraction from the mantle (e.g. Martin and Dickin 2005;Dickin et al 2010;Fig. 20).…”

Section: Geochemical and Isotopic Petrologymentioning

confidence: 99%

Tectonic Setting and Evolution of the Grenville Orogen: An Assessment of Progress Over the Last 40 Years

Rivers

2015

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SUMMARYThe Grenville Province is known for its high grade of metamorphism, complex ductile gneissic structure, and polyphase reworking, features indicative of residence in the deep crust (orogenic infrastructure) that hamper recognition of protoliths and original relationships and render tectonic interpretations especially challenging. This paper charts the evolving understanding from the 'Grenville Problem' of the 1950s before the plate tectonic paradigm, through a speculative quasiplate tectonic stage in the 1970s that effectively proved to be a dead end, and the first constrained plate tectonic models for pre-Grenvillian Laurentia in the 1980s, to the recent LHO (large hot orogen) and collapsed LHO models for the Grenville Orogen itself. The collapsed LHO model is based on the finding that significant amounts of the superstructure (upper orogenic crust) are preserved, and that the present crustal architecture can be explained by tectonic juxtaposition of infrastructure and superstructure in a late extensional event associated with crustal-scale collapse of a high-strain channel under an orogenic plateau. Conceptual breakthroughs and critical datasets assembled in the period 1980-2000 that were influential in guiding tectonic thinking are discussed and it is argued that present understanding was contingent on the results of 2-D numerical forward modelling of orogenesis, in particular the LHO experiments and the more recent models of orogenic collapse. As a result, for the first time a conceptual plate tectonic model for the convergence and collapse stages of the Grenville Orogen based on empirical field data (the inverse model) is broadly supported by numerical forward-modelling experiments constrained by physically plausible processes in a LHOand both are available for future testing and refinement. Moreover, they may also have application to other enigmatic high-grade Proterozoic orogens that have resisted simple incorporation within the plate tectonic narrative.

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The extent of juvenile crust in the Grenville Province: Nd isotope evidence

Cited by 56 publications

References 41 publications

Early Ordovician to Silurian evolution of exotic terranes in the Scandinavian Caledonides of the Ofoten–Troms area – terrane characterization and correlation based on new U–Pb zircon ages and Lu–Hf isotopic data

Early Ordovician to Silurian evolution of exotic terranes in the Scandinavian Caledonides of the Ofoten–Troms area – terrane characterization and correlation based on new U–Pb zircon ages and Lu–Hf isotopic data

Mesoproterozoic-trans-Laurentian magmatism: A synthesis of continent-wide age distributions, new SIMS U–Pb ages, zircon saturation temperatures, and Hf and Nd isotopic compositions

Tectonic Setting and Evolution of the Grenville Orogen: An Assessment of Progress Over the Last 40 Years

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