Werner Weber

Universitätsklinikum Knappschaftskrankenhaus Bochum

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Irving Jerome Witkind

United States Geological Survey

Oswaldo Siga Júnior

Universidade de São Paulo

Kei Sato

Universidade de São Paulo

MÂ

Miguel Ângelo Stipp Basei

Universidade de São Paulo

Z. Hajnal

University of Saskatchewan

T. E. Krogh

Royal Ontario Museum

ÊL

Ênio Leandro Machado

Universidade de Santa Cruz do Sul

S B Lucas

Health Canada

Cláudia Regina Passarelli

Universidade de São Paulo

K Ashton

Government of Saskatchewan

Cooperative Institutions

Universidade de São Paulo

Instituto de Geociencias

Geological Survey of Canada

United States Geological Survey

University of Alberta

Manitoba Hydro

University of Toronto

Université du Québec à Montréal

Universidade Brasil

Australian National University

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Reconnaissance geologic map of the Chamberlain Mountain Quadrangle, Powell County, Montana

Antarctica A Keystone in a Changing World (1979)

Werner Weber Irving Jerome Witkind

Quadrangle

Geologic map

10.3133/ofr79440

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Geology and Geochronology of the Wollaston Lake Fold Belt in Northwestern Manitoba

Canadian Journal of Earth Sciences (1975)

Werner Weber Rebecca Anderson G. S. Clark

Recent studies in the northeastern extension of the Wollaston fold belt in Manitoba suggest that Aphebian metasedimentary rocks of the southern Churchill province comprise a geosynclinal facies that is conformably overlain by a platform facies. A possible period of emergence and embryonic Hudsonian tectonism separates this lower sequence from a blanket of continental deposits, which is probably of large regional extent and includes part of the Hurwitz Group in the District of Keewatin.Rubidium–strontium total-rock isochron ages have been obtained for five rock units in the Kasmere Lake area of Manitoba. The ages reveal that the metasedimentary rocks of the Wollaston fold belt are bounded to the east by an Archean complex comprising a differentiated hypersthene-bearing rock series having a minimum age of 2745 ± 124 Ma ( 87 Rb = 1.39 × 10 −11 yr −1 ) and a quartz monzonite unit having a minimum age of 2636 ± 163 Ma.Hudsonian igneous rocks are mostly syn- to post-kinematic. The age of 1855 ± 62 Ma for a quartz monzonite of batholithic dimension coincides with the ages of similar syntectonic Hudsonian intrusions in the Northwest Territories. The age of 1800 ± 60 Ma obtained from a pelitic gneiss unit is a minimum age for the Hudsonian metamorphism and dates the end of the Hudsonian orogeny in this part of the Churchill province. An age of 1941 ± 25 Ma for a granitic gneiss along the western margin of the Wollaston fold belt indicates early or pre-Hudsonian magmatic activity.

Quartz monzonite

Orogeny

Geochronology

10.1139/e75-155

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Citations (10)

Metabasic rocks from the Itaiacoca group: U-Pb zircon ages and tectonic implications, southern Brazil

Abstracts (2004)

Oswaldo Siga Júnior Miguel Ângelo Stipp Basei Cláudia Regina Passarelli Kei Sato Hélcio Prazeres Filho

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Treatment of broad-based intracranial aneurysms with the LVIS EVO stent: a retrospective observational study at two centers with short- and medium-term follow-up

Scientific Reports (2023)

Christoph J. Maurer Ansgar Berlis Volker Maus Lars Behrens Werner Weber

Abstract The use of stents is well established in the treatment of broad-based intracranial aneurysms. The aim of this study is to report on safety, feasibility and midterm follow-up of the new LVIS EVO braided stent for the treatment of cerebral aneurysms. All consecutive patients with intracranial aneurysms who were treated with the LVIS EVO stent in two high volume neurovascular centers were retrospectively enrolled in this observational study. Clinical and technical complications, angiographic outcome and clinical short-term and midterm results were evaluated. The study included 112 patients with 118 aneurysms. 94 patients presented with incidental aneurysms, 13 patients with acute SAH and 2 patients with acute cranial nerve palsy. For 100 aneurysms a jailing technique was used, re-crossing of the stent was performed in 3 cases. For the residual 15 cases the stent was placed as a bail-out or as a second step. Immediate complete occlusion was observed in 85 aneurysms (72%). Midterm follow-up was available for 84 patients with 86 aneurysms (72.9%). One stent showed asymptomatic complete occlusion on follow-up imaging, in all other cases no in-stent stenosis was observed. The rate of complete occlusion was 79.1% at 6 months and 82.2% at 12–18 months. Midterm follow-up data of this retrospective observational cohort of two neurovascular centers corroborates the safety profile of the LVIS EVO device for treatment of ruptured and unruptured intracranial aneurysms.

Neurovascular bundle

10.1038/s41598-023-34270-0

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Citations (5)

Reconnaissance geologic map of the northern two-thirds of the Avon quadrangle, Lewis and Clark, and Powell Counties, Montana

Antarctica A Keystone in a Changing World (1979)

Werner Weber Irving Jerome Witkind

Quadrangle

Geologic map

10.3133/ofr79437

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An evolutionary model of the western churchill province and western margin of the superior province in Canada and the North-Central United States

Tectonophysics (1985)

A.C. Green Z. Hajnal Werner Weber

Continental Margin

Back-arc basin

10.1016/0040-1951(85)90212-4

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Citations (126)

The Pikwitonei Granulite Domain, Manitoba: a giant Neoarchean high-grade terrane in the northwest Superior ProvinceThis article is one of a series of papers published in this Special Issue on the theme of Geochronology in honour of Tom Krogh.N. Machado, T.E. Krogh, and W. Weber are deceased.

Canadian Journal of Earth Sciences (2011)

Larry M. Heaman Ch. O. Böhm Ênio Leandro Machado T. E. Krogh Werner Weber

The Pikwitonei Granulite Domain located at the northwestern margin of the Superior Province is one of the largest Neoarchean high-grade terranes in the world, with well-preserved granulite metamorphic assemblages preserved in a variety of lithologies, including enderbite, opdalite, charnockite, and mafic granulite. U–Pb geochronology has been attempted to unravel the protolith ages and metamorphic history of numerous lithologies at three main localities; Natawahunan Lake, Sipiwesk Lake, and Cauchon Lake. The U–Pb age results indicate that some of the layered enderbite gneisses are Mesoarchean (3.4–3.0 Ga) and the more massive enderbites are Neoarchean. The high-grade metamorphic history of the Pikwitonei Granulite Domain is complex and multistage with at least four episodes of metamorphic zircon growth identified: (1) 2716.1 ± 3.8 Ma, (2) 2694.6 ± 0.6 Ma, (3) 2679.6 ± 0.9 Ma, and (4) 2642.5 ± 0.9 Ma. Metamorphic zircon growth during episodes 2 and 3 are interpreted to be regional in extent, corresponding to M 1 amphibolite- and M 2 granulite-facies events, respectively, consistent with previous field observations. The youngest metamorphic episode at 2642.5 Ma is only recognized at southern Cauchon Lake, where it coincides with granite melt production and possible development of a major northeast-trending deformation zone. The timing and multistage metamorphic history recorded in the Pikwitonei Granulite Domain is similar to most Superior Province high-grade terranes and marks a fundamental break in Archean crustal evolution worldwide at the termination of prolific global Neoarchean greenstone belt formation.

Protolith

Migmatite

Orogeny

Charnockite

10.1139/e10-058

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Citations (35)

Precise U-Pb zircon ages for the Molson dyke swarm and the Fox River sill: Constraints for Early Proterozoic crustal evolution in northeastern Manitoba, Canada

Contributions to Mineralogy and Petrology (1986)

Larry M. Heaman Ênio Leandro Machado T. E. Krogh Werner Weber

Sill

Large igneous province

Flood basalt

Basement

Dike

Geochronology

10.1007/bf00371229

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Citations (102)

Timing of Paleoproterozoic granitoid magmatism along the northwestern Superior Province margin: implications for the tectonic evolution of the Thompson Nickel BeltThis article is one of a series of papers published in this Special Issue on the theme of Geochronology in honour of Tom Krogh.

Canadian Journal of Earth Sciences (2011)

Ênio Leandro Machado Larry M. Heaman T. E. Krogh Werner Weber M. T. Corkery

The U–Pb geochronology of three granitoid plutons and three granitic pegmatite dykes, largely from the Thompson Nickel Belt located along the northwestern Superior craton margin, was investigated to place constraints on the timing of felsic magmatism associated with closure of the Manikewan Ocean and final continent–continent collision to form the Trans-Hudson Orogen. These data indicate that 1840–1820 Ma granite magmatism along the Superior margin was more active than previously thought and that some magmatism extended beyond the Thompson Nickel Belt sensu stricto, including the 1836 ± 3 Ma Mystery Lake granodiorite, 1822 ± 5 Ma Wintering Lake granodiorite, and the 1825 ± 8 Ma Fox Lake granite located in the Split Lake Block. Granitic pegmatites within the Thompson Nickel Belt were emplaced late in the collisional history in the period 1.79–1.75 Ga and include a 1770 ± 2 Ma dyke exposed at the Thompson pit, a 1767 ± 6 Ma dyke at the Pipe Pit, and a 1786 ± 2 Ma dyke located at Paint Lake. The final stage of crustal amalgamation in the eastern Trans-Hudson Orogen involved Superior Province crustal thickening and partial melting forming 1.84–1.82 Ga granite magmas and then final collision at ∼1.8 Ga between the Superior Province and a continental block to the west consisting of the previously amalgamated Sask and Hearne cratons. Heating of the Superior craton margin and granitic magmatism continued past peak metamorphism (1790–1750 Ma); this thermal event is represented by the emplacement of numerous late pegmatite dykes and evidenced by cooling dates recorded by metamorphic minerals (e.g., titanite) in reworked Archean gneisses and Proterozoic intrusions.

Pegmatite

Felsic

Geochronology

10.1139/e10-079

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Citations (4)

Reconnaissance geologic map of the southern third of the Ovando Quadrangle, Powell County, Montana

Antarctica A Keystone in a Changing World (1979)

Werner Weber Irving Jerome Witkind

Quadrangle

Geologic map

10.3133/ofr79447

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