High precision microsampling and preparation of zoned garnet porphyroblasts for Sm–Nd geochronology

Pollington, Anthony D.; Baxter, Ethan F.

doi:10.1016/j.chemgeo.2010.12.014

Cited by 76 publications

(54 citation statements)

References 39 publications

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“…Two large garnets were selected for Sm-Nd geochronology following the methods of Pollington and Baxter (2011). To properly isolate a central section of the larger garnet (gt1), a 10 × 9 × 5-cm subvolume (including both large crystals) was sent for high resolution X-ray computed tomography at The University of Texas at Austin, Department of Geological Sciences.…”

Section: Methodsmentioning

confidence: 99%

“…3a). The garnets were microdrilled using the New Wave MicroMill at Boston University, following the procedures of Pollington and Baxter (2011). The zones were individually collected, hand crushed, and sieved to between 63 and 106 μm.…”

Section: Methodsmentioning

confidence: 99%

“…Previous work has shown that full cleansing of such fine-grained garnet powders is impossible (Pollington and Baxter, 2011). However, if the key inherited phase is a phosphate (e.g.…”

Section: Geochronologymentioning

confidence: 99%

See 2 more Smart Citations

Pulsed dehydration and garnet growth during subduction revealed by zoned garnet geochronology and thermodynamic modeling, Sifnos, Greece

Dragovic

Baxter

Caddick

2015

Earth and Planetary Science Letters

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105

101

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Pulsed dehydration and garnet growth during subduction revealed by zoned garnet geochronology and thermodynamic modeling, Sifnos, Greece

Dragovic

Baxter

Caddick

2015

Earth and Planetary Science Letters

Self Cite

105

101

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“…More-recent development of improved microsampling (e.g., Ducea et al, 2003, Johnston et al, 2007Pollington and Baxter, 2011) and differential geochronology techniques that use Lu-Hf and Sm-Nd zoning and ages (e.g., Lapen et al, 2003;Skora et al, 2006;Kylander-Clark et al, 2007;Kohn, 2009) have enabled high-precision dating of discrete portions of individual garnet grains. These approaches have allowed recognition of metamorphic episodes as short as~10 6 yr within crystal growth periods spanning~10 6 -10 7 yr (e.g., Baxter, 2010, Dragovic et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Single-shot laser ablation split stream (SS-LASS) petrochronology deciphers multiple, short-duration metamorphic events

2015

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“…Thöni 2002;Romer & Xiao 2005;Pollington & Baxter 2011), persistence of sub-microscopic relict mineral domains (e.g. Beltrando et al 2013) or stagnant fluid conditions (e.g.…”

Section: Development Of New Very High-precision Petrologically Contrmentioning

confidence: 99%

On the significance of short-duration regional metamorphism

Viete

Lister

2016

JGS

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Short-duration regional metamorphism is a recently observed and poorly understood phenomenon in metamorphic geology. In this review, it is defined as metamorphism on time scales that limit length scales (of the associated thermal anomaly) to significantly less than the thickness of the orogenic crust (<10 myr) or subducted oceanic lithosphere (<5 myr). Without appealing to exceptional heat sources, thermal models have been unable to account for peak metamorphic temperature during collisional orogenesis and subduction. This observation, combined with restricted time scales for regional metamorphism, suggests that metamorphic facies series can record atypical and transient thermal conditions (related to punctuated and localized heat advection and/or production), rather than normal, ambient conditions for the tectonic setting to which they are allied. Highprecision geochronology can resolve short-duration metamorphic estimates of 1 -10 myr. However, diffusion geospeedometry typically yields extremely short metamorphic durations (<1 myr); tools in metamorphic geology may have matured to the point that the discipline is beginning to recognize episodicity and criticality in deep processes. New, very high-precision petrochronology techniques offer great potential to probe the veracity of extremely short metamorphic durations being obtained from diffusion geospeedometry. Benchmarking of these new very high-precision petrochronology techniques must become a priority for metamorphic geology.Received 26 May 2016; revised 2 October 2016; accepted 27 October 2016Early interpretations of the geological record leant heavily on catastrophism. As geology matured as a science, uniformitarianism came to supersede catastrophism. Uniformitarianism offers a more sophisticated, logical framework for interpretation of the rock record within the context of current and observable processes. However, the grand success of the uniformitarian philosophy has also resulted in a propensity toward interpretation of deep (and thus unobservable) geological phenomena in terms of slowly evolving or steady-state processes. A notable example of this preference for gradualism in deep processes has been ideas for the origins of regional metamorphism and metamorphic facies series, and implications for the nature of tectonism. Barrow (1893Barrow ( , 1912 was the first to map regional metamorphism on the basis of diagnostic mineral assemblages. His Barrovian metamorphic sequence, exposed in NE Scotland, comprises a series of 'isograds' marking the first appearance of chlorite, biotite, garnet, staurolite, kyanite and sillimanite in pelitic lithologies, in the direction of increasing metamorphic grade. Regional metamorphism recorded by Barrovian-type isograds defines intermediate pressure/temperature (P/T ) conditions (575 -1250°C GPa Barrow (1893) originally proposed that his Barrovian metamorphism resulted from magmatic advection of heat from depth. Following development of the theory of plate tectonics, numerous models were proposed for the ori...

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High precision microsampling and preparation of zoned garnet porphyroblasts for Sm–Nd geochronology

Cited by 76 publications

References 39 publications

Pulsed dehydration and garnet growth during subduction revealed by zoned garnet geochronology and thermodynamic modeling, Sifnos, Greece

Pulsed dehydration and garnet growth during subduction revealed by zoned garnet geochronology and thermodynamic modeling, Sifnos, Greece

Single-shot laser ablation split stream (SS-LASS) petrochronology deciphers multiple, short-duration metamorphic events

On the significance of short-duration regional metamorphism

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