Recrystallized impact glasses of the Onaping formation and the Sudbury igneous Complex, Sudbury Structure, Ontario, Canada

Dressler, B. O.; Weiser, Thorolf W.; Brockmeyer, P.

doi:10.1016/0016-7037(96)00067-1

Cited by 33 publications

(30 citation statements)

References 44 publications

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“…(2) The dike melts derived from intermediate stages of fractional crystallization (± contamination) of the Main Mass of the SIC (Wood and Spray 1998;Prevec et al 2000;Therriault et al 2002), or (3) radial dikes including the Sublayer sensu stricto (Fig. 1b) are closely related to an endogenic intrusion that is younger than the granophyre Eckstrand 1993, 1994) and possibly younger than the norite (Dressler et al 1996).…”

Section: Introductionmentioning

confidence: 99%

Differentiation and emplacement of the Worthington Offset Dike of the Sudbury impact structure, Ontario

Hecht

Wittek

Riller

et al. 2008

Meteorit & Planetary Scien

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Abstract-The Offset Dikes of the 1.85 Ga Sudbury Igneous Complex (SIC) constitute a key topic in understanding the chemical evolution of the impact melt, its mineralization, and the interplay between melt migration and impact-induced deformation. The origin of the melt rocks in Offset Dikes as well as mode and timing of their emplacement are still a matter of debate. Like many other offset dikes, the Worthington is composed of an early emplaced texturally rather homogeneous quartz-diorite (QD) phase at the dike margin, and an inclusion-and sulfide-rich quartz-diorite (IQD) phase emplaced later and mostly in the centre of the dike. The chemical heterogeneity within and between QD and IQD is mainly attributed to variable assimilation of host rocks at the base of the SIC, prior to emplacement of the melt into the dike. Petrological data suggest that the parental magma of the Worthington Dike mainly developed during the pre-liquidus temperature interval of the thermal evolution of the impact melt sheet (>1200 °C). Based on thermal models of the cooling history of the SIC, the two-stage emplacement of the Worthington Dike occurred likely thousands to about ten thousand years after impact. Structural analysis indicates that an alignment of minerals and host rock fragments within the Worthington Dike was caused by ductile deformation under greenschist-facies metamorphic conditions rather than flow during melt emplacement. It is concluded that the Worthington Offset Dike resulted from crater floor fracturing, possibly driven by late-stage isostatic readjustment of crust underlying the impact structure.

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Section: Introductionmentioning

confidence: 99%

Differentiation and emplacement of the Worthington Offset Dike of the Sudbury impact structure, Ontario

Hecht

Wittek

Riller

et al. 2008

Meteorit & Planetary Scien

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“…Large impacts can access quite heterogeneous crust. For example, Dressler et al (1996) showed that melt particles obtained from the Onaping Formation, widely considered the suevite deposit of the Sudbury Structure, have compositions that are highly heterogeneous and represent diaplectic and liquid-state glasses that quenched rapidly after shock melting of the lithologically varied target sequence. A recent study of Ries melt particles and glasses by Osinski (2003) showed that various types of glasses exist in the Ries suevite, which also originated from the melting of different target lithologies.…”

Section: Comparison With Melt Rocks From Other Impact Structuresmentioning

confidence: 99%

“…Note that the nearest exposures of Cretaceous target rocks occur in Belize and Guatemala, several hundred kilometers from the impact structure. information about cratering dynamics (e.g., Dressler 1996;Hörz et al 2002). Impact melt particles are commonly found as part of either fallback deposits in impact structures, fallout deposits of impact breccia, and even as clasts in injection dikes within the crater floor (Dressler and Reimold 2001).…”

Section: Introductionmentioning

confidence: 99%

Major and trace element compositions of melt particles and associated phases from the Yaxcopoil-1 drill core, Chicxulub impact structure, Mexico

Tuchscherer

Reimold

Gibson

et al. 2006

Meteoritics &Amp; Planetary Science

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Abstract-Melt particles found at various depths in impactites from the Yaxcopoil-1 borehole into the Chicxulub impact structure (Yucatán) have been analyzed for their major and trace element abundances. A total of 176 electron microprobe and 45 LA-ICP-MS analyses from eight different melt particles were investigated. The main purpose of this work was to constrain the compositions of precursor materials and secondary alteration characteristics of these melt particles. Individual melt particles are highly heterogeneous, which makes compositional categorization extremely difficult. Melt particles from the uppermost part of the impactite sequence are Ca-and Na-depleted and show negative Ce anomalies, which is likely a result of seawater interaction. Various compositional groupings of melt particles are determined with ternary and binary element ratio plots involving major and trace elements. This helps distinguish the degree of alteration versus primary heterogeneity of melt phases. Comparison of the trace element ratios Sc/Zr, Y/Zr, Ba/Zr, Ba/Rb, and Sr/Rb with compositions of known target rocks provides some constraints on protolith compositions; however, the melt compositions analyzed exceed the known compositional diversity of possible target rocks. Normalized REE patterns are unique for each melt particle, likely reflecting precursor mineral or rock compositions. The various discrimination techniques indicate that the highly variable compositions are the products of melting of individual minerals or of mixtures of several minerals. Small, angular shards that are particularly abundant in units 2 and 3 represent rapidly quenched melts, whereas larger particles (>0.5 mm) that contain microlites and have fluidal, schlieric textures cooled over a protracted period. Angular, shard-like particles with microlites in unit 5 likely crystallized below the glass transition temperature or underwent fragmentation during or after deposition.

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“…To investigate the change in image resolution by changing the spot size, we analyzed two heterogeneous clasts from the Black Member of the Onaping formation in Sudbury, Ontario, Canada (e.g., Dressler et al 1996, and references therein). This formation is the fallback breccia of the Sudbury meteorite impact.…”

Section: Limitation To Image Resolutionmentioning

confidence: 99%

Imaging Element-Distribution Patterns in Minerals by Laser Ablation - Inductively Coupled Plasma - Mass Spectrometry (La-Icp-Ms)

Ulrich

Kamber

Jugo

et al. 2009

The Canadian Mineralogist

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We demonstrate the application potential of laser-ablation -inductively coupled plasma -mass spectrometry (LA-ICP-MS) to map the distribution of major and trace elements in a variety of samples. The examples cover a wide range of elements, including the rare-earth elements (REE) and platinum-group elements (PGE). In order to test the capabilities of the technique, samples of different matrices were analyzed (i.e., carbonates, silicates and sulfides). The main obstacle to rapid processing of element-distribution maps by laser ablation was data processing. This has been overcome with the development of new software, such as IoLITE, and improved designs of the laser-ablation cells and refinements of commercially available laser systems. It is possible to obtain fully quantified concentration maps for single-matrix samples using parallel adjoining line-scans. Single spot-analyses will result in better precision and accuracy, but the geochemical images are superior to conventional laser-ablation spot-analysis because they reveal geochemical details that are not visible under the microscope and cannot be appreciated with single spot-analyses. In addition to providing spatial information, the individual line-scans that are used in the image acquisition offer the option to obtain quantitative results along any part of the scan. Using LA-ICP-MS imaging, our dataset reveals zoned REE distribution in garnet crystals, a heterogeneous occurrence of the PGE in sulfides, as well as the internal chemical structures in ooids with respect to conditions of growth.Keywords: imaging, trace elements, laser-ablation ICP-MS, sulfides, oolith, garnet. sommaIRENous démontrons ici le potentiel de l'analyse par ablation au laser avec plasma à couplage inductif et spectrométrie de masse (LA-ICP-MS) pour cartographier la distribution des éléments majeurs et en traces dans une variété d'échantillons. Ces exemples impliquent plusieurs éléments, y inclus les terres rares et les éléments du groupe du platine. Afin d'évaluer les capacités de la technique, nous avons choisi des échantillons ayant plusieurs matrices différentes (par exemple, carbonates, silicates et sulfides). L'obstacle principal à la production rapide de telles cartes de distribution par ablation au laser serait la réduction des données. La disponibilité d'un nouveau logiciel, IoLITE, et des affinements récents dans la conception de la cellule d'ablation sur les systèmes courants, ont permis de surmonter cet obstacle. Il est maintenant possible de construire des cartes de répartition d'éléments pleinement quantifiées là où les échantillons ont une seule matrice en utilisant des balayages linéaires adjacents. Une analyse à un seul point peut produire une meilleure précision et justesse, mais les images géochimiques fournissent un outil supérieur à l'analyse conventionnelle en révélant des détails invisibles au microscope ou impossibles à obtenir avec une série d'analyses ponctuelles. § E-mail address: tulrich@laurentian.ca En plus de fournir de l'information sur la disposi...

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Recrystallized impact glasses of the Onaping formation and the Sudbury igneous Complex, Sudbury Structure, Ontario, Canada

Cited by 33 publications

References 44 publications

Differentiation and emplacement of the Worthington Offset Dike of the Sudbury impact structure, Ontario

Differentiation and emplacement of the Worthington Offset Dike of the Sudbury impact structure, Ontario

Major and trace element compositions of melt particles and associated phases from the Yaxcopoil-1 drill core, Chicxulub impact structure, Mexico

Imaging Element-Distribution Patterns in Minerals by Laser Ablation - Inductively Coupled Plasma - Mass Spectrometry (La-Icp-Ms)

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