Quantitative elemental mapping of granulite‐facies monazite: Textural insights and implications for petrochronology

Weller, Owen M.; Jackson, Simon E.; Miller, William G.; St-Onge, M R; Rayner, N M

doi:10.1111/jmg.12552

Cited by 17 publications

(10 citation statements)

References 60 publications

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“…In Canada, numerous studies of the Trans-Hudson orogen have shown that it formed during progressive closure of the Manikewan Ocean and accretion of intervening suspect terranes, culminating with the collision of the lowerplate Archean Superior craton with an upper-plate collage of Archean and Paleoproterozoic crustal blocks (collectively known as the Churchill plate) at ca. 1.82 Ga (St-Onge et al, 2006Corrigan et al, 2009;Corrigan, 2012;Weller and St-Onge, 2017;Weller et al, 2020; and references therein). Several parallels have been drawn between the Trans-Hudson orogen and the archetypical Himalaya-Tibet orogen of central Asia as both orogens are of a similar scale and exhibit similar patterns of magmatism and metamorphism with respect to the timing of collision (St-Onge et al, 2006;Eaton and Darbyshire, 2010;Thompson et al, 2010;Bastow et al, 2011;Corrigan, 2012;Weller and St-Onge, 2017).…”

Section: Trans-hudson Orogeny and Closure Of The Manikewan Oceanmentioning

confidence: 99%

Temporal and spatial evolution of orogens: a guide for geological mapping

François¹,

Pubellier

Robert

et al. 2022

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Orogens develop in convergent settings involving two or more continental and/or oceanic plates. They are traditionally defined as zones of crustal deformation associated with mountain building resulting from either accretion of a terrane and/or an arc, continent-continent collision or rift-inversion. However, this definition does not consider the genetic link between an oceanic domain and an intracontinental rift, even though extension associated with a scissor-shape opening can be demonstrated in many oceanfloored basins. Consequently, we propose a new concept of orogenic evolution based on the development of extensional margins subsequently subjected to crustal shortening. Thus orogens that develop as a result of the closure of wide basins, are distinguished from mountain belts developed above subduction zones or that result from continental collision and inverted intra-continental rifts. Our review of several key orogens identifies similarities and differences in geodynamic processes through geological time including prior to the onset of plate tectonics ca. 2.5 Ga. We propose that mapping based on comparative tectonics is a good way to constrain such an evolution, and that this can start with a global-scale map of past-to-modern orogens aimed at re-exploring mountain building concepts spatially and temporarily. This is the primary objective of IGCP 667 project "World Map of Orogens".

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Section: Trans-hudson Orogeny and Closure Of The Manikewan Oceanmentioning

confidence: 99%

Temporal and spatial evolution of orogens: a guide for geological mapping

François¹,

Pubellier

Robert

et al. 2022

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“…as done by McKenzie & Priestley, 2016). This approach is taken because of recent results suggesting that partial melting has a limited effect on the rates of radiogenic heating in the partitioned melt and residue, due to the growth and/or retention of relatively high‐Th accessory minerals in the residue compensating for the removal of other heat‐producing elements during anatexis and melt migration (Alessio et al., 2018; Weller et al., 2020; Yakymchuk & Brown, 2019). This result is consistent with the lack of observed correlation between metamorphic grade and rate of radiogenic heating in global compilations (Hasterok et al., 2018).…”

Section: Model Set‐upmentioning

confidence: 99%

“…Rudnick & Gao, 2014; Hacker et al., 2015). It is an open question how to reconcile these models and the observations of limited differences in radiogenic heating between sub‐ and supra‐solidus rocks (Alessio et al., 2018; Bea & Montero, 1999; Weller et al., 2020; Yakymchuk & Brown, 2019). We therefore take the simple approach of assuming constant radiogenic heating throughout the crust.…”

Section: Model Set‐upmentioning

confidence: 99%

The controls on the thermal evolution of continental mountain ranges

Copley

Weller

2022

Journal Metamorphic Geology

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This paper examines the controls on the thermal evolution of continental mountain ranges and investigates how pressure (P) and temperature (T) estimates from metamorphic rocks can be used to reconstruct the thermal histories of orogenic belts. We show that one-dimensional models can approximate the temperature structure of most continental mountain belts, and find that the metamorphic conditions typical of such tectonic settings can most easily be achieved by thickening of the mid-to upper-crust above a rigid lower crustal substrate. Homogeneous thickening of the entire lithosphere can only result in these conditions under unusual circumstances. This result implies that thickening above rigid lower crust has been the dominant mode of mountain-building preserved in the rock record. In this situation, modest rates of vertically distributed internal radiogenic heating (1AE0.5 μW/m 3 ) are able to produce typical metamorphic conditions and timescales, without the requirement for an external source of heat. In a given model, peak temperature conditions for rocks originally positioned closely in depth (e.g. 5 km apart) occur at times that can be separated by over 10 Myr, highlighting the spectrum of ages and conditions that can be produced by a single geometrically simple mountain-building event. The direction of approach in P-T space towards the highest-T conditions experienced by a rock (i.e. the curvature of the P-T loop) is the most diagnostic feature that allows the thermal and tectonic history of a mountain belt to be estimated, highlighting the importance of determining prograde P-T paths. Combining estimates of the peak-T conditions with multiple other sources of information (e.g. the timescales of metamorphism or the initial crustal thickness) can also allow the reconstruction of the mountain range evolution under most circumstances. Many configurations of continental mountain-building result in rocks transiently passing through regions with low average thermal gradients (e.g. 10-15 C/km), suggesting that such gradients should not be used to infer the presence of subduction. Analysis of existing P-T loops from the 3.2 Ga metamorphism in the Barberton terrane suggests that mountain-building processes at that time and place were similar to those in present-day mountain ranges, implying that large regions of rigid

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“…This is consistent with a low modal abundance of garnet (<<5%) that is highly resorbed and embayed by matrix biotite grains hosting most monazite inclusions (Figure 3a). Alternatively, a recent study by Weller et al (2020) shows that the trace element content of monazite may reflect local equilibria independent of microstructural location or proximity to garnet.…”

Section: Timing Of Metamorphism In the Egcmentioning

confidence: 99%