U–Pb evidence for polymetamorphic history of Huronian rocks within the Grenville front tectonic zone east of Sudbury, Ontario, Canada

Corfú, Fernando; Easton, R.M.

doi:10.1016/s0009-2541(00)00241-2

Cited by 45 publications

(21 citation statements)

References 43 publications

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“…Core-rim pairs are joined by a line than titanite in a given area (e.g. Corfu and Easton 2001;Flowers et al 2006;Mezger et al 1989). Experimental diffusion data for titanite give a closure temperature of ~575-700 °C for grain radii of 0.1-1.0 mm and cooling rates of 2-10 °C/Ma (Cherniak 1993).…”

Section: Closure Temperature Of Pb In Rutilementioning

confidence: 99%

Constraints on the thermal evolution of the Adriatic margin during Jurassic continental break-up: U–Pb dating of rutile from the Ivrea–Verbano Zone, Italy

Ewing

Rubatto

Beltrando

et al. 2015

Contrib Mineral Petrol

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documented along the western margin of the Adriatic plate. The ~160 Ma age population postdates the activity of all known rift-related structures within the Adriatic margin, but coincides with extensive gabbroic magmatism and exhumation of sub-continental mantle to the floor of the Alpine Tethys, west of the Ivrea Zone. We propose that this ~160 Ma early post-rift age population records regional cooling following episodic heating of the distal Adriatic margin, likely related to extreme lithospheric thinning and associated advection of the asthenosphere to shallow levels. The partial preservation of the ~175 Ma age cluster suggests that the post-rift (~160 Ma) heating pulse was of short duration. The regional consistency of the data presented here, which is in contrast to many other thermochronometers in the IVZ, demonstrates the value of the rutile U-Pb technique for probing the thermal evolution of high-grade metamorphic terrains. In the IVZ, a significant decoupling between Zr-in-rutile temperatures and U-Pb ages of rutile is observed, with the two systems recording events ~120 Ma apart.

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Section: Closure Temperature Of Pb In Rutilementioning

confidence: 99%

Constraints on the thermal evolution of the Adriatic margin during Jurassic continental break-up: U–Pb dating of rutile from the Ivrea–Verbano Zone, Italy

Ewing

Rubatto

Beltrando

et al. 2015

Contrib Mineral Petrol

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“…Grenville materials are characterized by metamorphic grades as high as upper amphibolite facies (Easton 1991). Grenville materials were thrust northwestward onto the Southern Province during the~1 Ga Grenville orogeny (Corfu and Easton 2001).…”

Section: Surface Materials Of the Sudbury Study Areamentioning

confidence: 99%

A Landsat-based study of black rock coatings proximal to base metal smelters, Sudbury, Ontario, Canada

Malcolm

Leverington

Schindler

2015

International Journal of Remote Sensing

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Past emission of metal-bearing particulate matter, sulphur dioxide (SO 2 ), and sulphuric acid by base metal smelters in the Sudbury region led to widespread loss of vegetation, contamination of soils, and formation of black coatings on rock surfaces. These black coatings formed through the incorporation of smelter-borne particulate matter into the partly dissolved uppermost layers of siliceous minerals on exposed rock, and are characterized by high heavy-metal content. This study involved assessment of the reflectance properties of black coatings in the Sudbury region, and determination of the geographic distribution of coatings through supervised classification of reflectance data derived from a Landsat Enhanced Thematic Mapper Plus (ETM+) image. Classifications involved the use of the Spectral Angle Mapper (SAM), Maximum Likelihood, and Feedforward Backpropagation Neural Network algorithms. The reflectance spectra of black coatings in the Sudbury region are relatively flat and featureless, and are characterized by reflectance values less than~13% across the visible, nearinfrared, and short-wave infrared. Spectral properties are similar to those of magnetite, a spinel-group mineral known to be present in Sudbury coatings. The presence of carbon-rich soot particles may be an important influence on the reflectance properties of coatings. SAM classification results are characterized by the widespread mislabelling of uncoated urban and open-pit sites as mantled by black coatings, and neural network results problematically mislabel some uncoated wetland sites as coated. Results generated by the Maximum Likelihood algorithm most usefully depict the distribution of exposed black coatings in the Sudbury region. The mapping of black coatings using remote-sensing methods can provide useful information on the spatial character of environmental degradation in the vicinity of smelters, and should be helpful in the monitoring of environmental recovery where emissions have been reduced or eliminated.

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“…18c). In Figure 18a, P-T data for minerals with ages between 1030 and 990 Ma (Krogh 1994;Bethune and Davidson 1997;Buckley et al 1997;Corfu and Easton 2001) are compared with maximum temperatures and pressures at those temperatures for model times between 60-90 Ma-emt. The model values cluster within the range of the observational data.…”

Section: Geodynamic Modelling and Geological Characteristics Within Tmentioning

confidence: 99%

Logan Medallist 2. Geophysics and Geology: An Essential Combination Illustrated by LITHOPROBE Interpretations–Part 1, Lithospheric Examples

Clowes¹

2015

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U–Pb evidence for polymetamorphic history of Huronian rocks within the Grenville front tectonic zone east of Sudbury, Ontario, Canada

Cited by 45 publications

References 43 publications

Constraints on the thermal evolution of the Adriatic margin during Jurassic continental break-up: U–Pb dating of rutile from the Ivrea–Verbano Zone, Italy

Constraints on the thermal evolution of the Adriatic margin during Jurassic continental break-up: U–Pb dating of rutile from the Ivrea–Verbano Zone, Italy

A Landsat-based study of black rock coatings proximal to base metal smelters, Sudbury, Ontario, Canada

Logan Medallist 2. Geophysics and Geology: An Essential Combination Illustrated by LITHOPROBE Interpretations–Part 1, Lithospheric Examples

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