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Krogh, Thomas

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Journal Article
Published: 23 February 2011
Canadian Journal of Earth Sciences (2011) 48 (2): 161-185.
...Thomas E. Krogh; Sandra L. Kamo; Thomas B. Hanley; David F. Hess; Peter S. Dahl; Robert E. Johnson Abstract The Middle Mountain Metamorphic Domain of the Montana Metasedimentary Terrane, northwestern Wyoming Craton, within the northwestern Tobacco Root Mountains, mainly comprises migmatized...
FIGURES
Journal Article
Published: 23 February 2011
Canadian Journal of Earth Sciences (2011) 48 (2): 87-94.
... laboratoires qui utilisent ses méthodes. In this Special Issue we wish to honour the scientific achievements of Thomas Edvard Krogh (1931–2008). Tom’s innovations in the field of U–Pb geochronology in the 1970s and 1980s opened the door for geologists to scrutinize the temporal evolution of Earth like...
FIGURES
Journal Article
Published: 10 February 2011
Canadian Journal of Earth Sciences (2011) 48 (2): 205-245.
...L. M. Heaman; Ch. O. Böhm; N. Machado; T. E. Krogh; W. Weber; M. T. Corkery Abstract 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...
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Journal Article
Published: 24 February 2011
Canadian Journal of Earth Sciences (2011) 48 (2): 441-472.
...Thomas E. Krogh; Sandra L. Kamo; Peter Robinson; Michael P. Terry; Kim Kwok Abstract Reconstructing tectonic histories involving continental collision, subduction, and exhumation at plate-tectonic rates of ∼1 cm/year, requires precise U–Pb zircon geochronology. The Western Gneiss Region has...
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Journal Article
Published: 09 February 2011
Canadian Journal of Earth Sciences (2011) 48 (2): 515-541.
...Yvon Lemieux; Thomas Hadlari; Antonio Simonetti Abstract U–Pb ages have been determined on detrital zircons from the Upper Devonian Imperial Formation and Upper Devonian – Lower Carboniferous Tuttle Formation of the northern Canadian Cordilleran miogeocline using laser ablation – multicollector...
Journal Article
Published: 01 February 2011
Canadian Journal of Earth Sciences (2011) 48 (2): 389-417.
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Journal Article
Published: 23 February 2011
Canadian Journal of Earth Sciences (2011) 48 (2): 117-139.
... metamorphism ( Krogh et al. 1984 ). It is also among the most resistant phases with regard to the destructive effects of impact ( Krogh et al. 1993 ) and subsequent erosion ( Cavosie et al. 2010 ). In some cases zircon residua may be the only physical records available for dating large impact events...
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Journal Article
Published: 26 January 2011
Canadian Journal of Earth Sciences (2011) 48 (2): 325-346.
...N. Machado; L. M. Heaman; T. E. Krogh; W. Weber; M. T. Corkery Abstract 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...
FIGURES
Journal Article
Published: 18 January 2011
Canadian Journal of Earth Sciences (2011) 48 (2): 295-324.
..., the latter was preferred for hand picking. Analyses were generally carried out on the diamagnetic zircon separately to minimize discordance. When samples did not yield diamagnetic zircon, analyses were performed on zircons with the lowest magnetic susceptibility ( Krogh 1982 a ). The minerals were observed...
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Series: GSA Special Papers
Published: 01 January 2006
DOI: 10.1130/2006.2405(06)
... descriptions and a more detailed geological setting can be found in Schiøtte et al. (1989) and Ryan and Martineau (1992) , respectively. Zircon and titanite U-Pb analysis followed modified procedures of Krogh (1973) and Corfu (1988) , respectively. All zircons were air abraded to remove surfaces...
Journal Article
Published: 02 January 2003
Reviews in Mineralogy and Geochemistry (2003) 53 (1): 145-181.
...Donald W. Davis; Thomas E. Krogh; Ian S. Williams © The Mineralogical Society Of America 2003 An exact knowledge of rock formation ages is perhaps the single most important tool needed for assembling the geologic record into a coherent history. Moreover, the age of Earth and the time...
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Journal Article
Published: 14 June 2002
Canadian Journal of Earth Sciences (2002) 39 (5): 831-843.
...Thomas E. Krogh; Sandra Kamo; Charles F. Gower; J. Victor Owen Abstract Four U–Pb dating sites straddling the Grenville front on the Labrador coast were investigated. Sites 1 and 2 exhibit complex intrusive, deformational, and metamorphic histories and were studied in detail, whereas two simpler...
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Journal Article
Published: 14 June 2002
Canadian Journal of Earth Sciences (2002) 39 (5): 897-898.
...Charles F. Gower; Thomas E. Krogh; D.T. James Abstract Chart 2: Correlation chart of the eastern Grenville Province and its northern Foreland, including a location map showing regional geological subdivisions and reference list. Corresponding author (e-mail: cfg@zeppo.geosurv.gov.nf.ca...
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Journal Article
Published: 03 June 2002
Canadian Journal of Earth Sciences (2002) 39 (5): 795-829.
...Charles F. Gower; Thomas E. Krogh Abstract The geological evolution of the eastern Grenville Province can be subdivided into three stages. During the first stage , namely pre-Labradorian (> 1710 Ma) and Labradorian (1710–1600 Ma) events, a continental-marginal basin was created and subsequently...
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Journal Article
Published: 07 September 1999
Canadian Journal of Earth Sciences (1999) 36 (4): 627-647.
...Lori Wilkinson; Alexander R Cruden; Thomas E Krogh Abstract The Larder Lake - Cadillac deformation zone is one of several anastomosing zones of high strain within the Abitibi greenstone belt. In the Kirkland Lake area, Ontario, the Larder Lake - Cadillac deformation zone is characterized...
Journal Article
Published: 01 September 1996
Canadian Journal of Earth Sciences (1996) 33 (9): 1308-1324.
...Hardolph A. Wasteneys; Richard J. Wardle; Thomas E. Krogh Abstract Near Saglek Fiord, a northerly trending boundary between the early Archean Saglek block and the middle Archean Hopedale block extends between drill sites which, respectively, sampled Uivak amphibolite gneiss with U–Pb zircon...
Journal Article
Published: 01 September 1995
Canadian Journal of Earth Sciences (1995) 32 (9): 1411-1425.
...François Bussy; Thomas E. Krogh; Richard J. Wardle Abstract In the Cape Caribou River allochthon (CCRA), metaigneous and gneissic units occur as a shallowly plunging synform in the hanging wall of the Grand Lake thrust system (GLTS), a Grenvillian structure that forms the boundary between the Mealy...
Journal Article
Journal: Geology
Published: 01 March 1995
Geology (1995) 23 (3): 281-284.
...Sandra L. Kamo; Thomas E. Krogh Abstract New U-Pb data for five of six individual shocked zircon grains from the Cretaceous-Tertiary (K-T) boundary fireball layer, Rock Creek site, south-central Saskatchewan, yield a source age of 548 ± 6 Ma. The collinear data points are variably discordant...
Journal Article
Published: 01 January 1995
Bulletin de la Société Géologique de France (1995) 166 (1): 15-21.
...Driss Oukemeni; James Bourne; Thomas E. Krogh GeoRef, Copyright 2004, American Geological Institute. 1995 ...
Journal Article
Published: 01 August 1993
Canadian Journal of Earth Sciences (1993) 30 (8): 1607-1612.
...John D. Greenough; Sandra L. Kamo; Thomas E. Krogh Abstract Mafic sills from Cape St. Mary's on the Avalon Peninsula of Newfoundland give an U–Pb baddeleyite age of 441 ± 2 Ma. This age corresponds with the earliest ages recorded for the climactic Silurian orogenic event that dominantly affected...