Duration of the early Cambrian: U$z.sbnd;Pb ages of volcanic ashes from Avalon and Gondwana Landing E., Bowring S.A., Davidek K.L., Westrop S.R., Geyer G. & Heldmaier W., Canadian Journal of Earth Sciences, 1998, 35/4 (329?338)

Dedication: Dr. John F. Lewry (19391999; see Saskatchewan Geological Survey 1999) dedicated his career to investigations of the SaskatchewanManitoba segment of the Trans-Hudson Orogen (THO), one of the principal Paleoproterozoic orogens associated with the assembly of Laurentia. Indeed, one can make a strong case that Lithoprobe's Trans-Hudson Orogen Transect (THOT) was designed to test the tectonic models proposed by John Lewry. He delineated the distinct tectonic provinces in the western part of the THO, predicted the presence of an Archean craton trapped within the THO, and recognized and interpreted the significance of the Pelican Thrust between the juvenile Paleoproterozoic volcanic arc complex of the western Flin Flon Domain and the Archean craton, now called the Sask craton. The research published in Lewry and Stauffer (1990), and many of his ideas, provided the framework for the design of the THOT geophysical and geological studies. John Lewry was co-leader of the THOT until he passed away in 1999 after a battle with cancer. This Special Issue of the Canadian Journal of Earth Sciences is dedicated to him.

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Ali Mehmet Celâl Şengör: A geologist who unravels the histories of continents and oceans

Canadian Journal of Earth Sciences ◽

10.1139/cjes-2019-0179 ◽

2019 ◽

Vol 56 (12) ◽

pp. v-viii

Author(s):

Ali Polat ◽

John F. Dewey

Keyword(s):

Earth Sciences ◽

Canadian Journal ◽

Plate Tectonics ◽

Research Articles ◽

Special Issue ◽

Tectonic Processes ◽

History Of Geology ◽

History Of ◽

Rocky Planets

This second issue of the Canadian Journal of Earth Sciences special issue dedicated to Ali Mehmet Celâl Şengör for his outstanding contributions to plate tectonics and history of geology includes 11 research articles. These articles have diverse subject matters dealing with tectonic processes in California, Africa, Asia, Iceland, Europe, Canada, and rocky planets. The summaries and main conclusions of these articles are presented here.

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Canadian Journal of Earth Sciences, Vol. 3, No. 6, 1966, [i], 737–915 p., illus., 14 maps [in separate folder]. (Obtainable from National Research Council, Ottawa 7, Canada. $2.)

Journal of Glaciology ◽

10.1017/s0022143000020256 ◽

1967 ◽

Vol 6 (48) ◽

pp. 945-947

Author(s):

Walther Hofmann

Keyword(s):

Earth Sciences ◽

Canadian Journal ◽

Research Council ◽

National Research Council

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Reply to the discussion of the reply by R.L. Romer and U. Kroner on “Geochemical signature of Ordovician Mn-rich sedimentary rocks on the Avalonian shelf” 1Appears in the Canadian Journal of Earth Sciences, 49(11): 1372–1377 [doi:10.1139/e2012-049].

Canadian Journal of Earth Sciences ◽

10.1139/cjes-2012-0142 ◽

2012 ◽

Vol 49 (11) ◽

pp. 1378-1383

Author(s):

Rolf L. Romer ◽

Uwe Kroner

Keyword(s):

Earth Sciences ◽

Canadian Journal ◽

Sedimentary Rocks ◽

Sedimentary Sequence ◽

The Core ◽

Geochemical Signature

Romer and Kroner (2012) stated “the core of the Harlech Dome (i) in part is made up of Ordovician deposits and (ii) contains tectonic repetitions”. In their comment, Schofield et al. (this issue) distort this statement and state that (i) we claim the entire sedimentary sequence of the Harlech Dome is Ordovician and (ii) we misinterpreted their zircon data. We disagree. In our reply, we demonstrate that the argumentation of Schofield et al. (this issue) is driven by circular argumentation and that their use and interpretation of U–Pb zircon data is inadequate.

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Duration of the Early Cambrian: U-Pb ages of volcanic ashes from Avalon and Gondwana

Canadian Journal of Earth Sciences ◽

10.1139/e97-107 ◽

1998 ◽

Vol 35 (4) ◽

pp. 329-338 ◽

Cited By ~ 137

Author(s):

Ed Landing ◽

Samuel A Bowring ◽

Kathleen L Davidek ◽

Stephen R Westrop ◽

Gerd Geyer ◽

...

Keyword(s):

New Brunswick ◽

Lower Cambrian ◽

Young Age ◽

Early Cambrian ◽

Zircon Age ◽

South Wales ◽

Volcanic Ashes

Volcanic zircons from three ashes give a U-Pb date of 511 ± 1 Ma on trilobite-bearing, upper Lower Cambrian (upper Branchian Series) strata of southern New Brunswick that correlate into the Siberian middle Botomian - Toyonian Stage interval. This very young age on the late, but not latest, Early Cambrian of Avalon is consistent both with a 519 ± 1 Ma age on the older Caerfai Bay Shales of south Wales that are tentatively correlated into strata with the oldest Avalonian trilobites (lower Branchian) and with a 517 ± 1.5 Ma age on the Antatlasia gutta-pluviae Zone (trilobites) of Morocco. Determination of a 522 ± 2 Ma zircon age on the Moroccan subtrilobitic Lower Cambrian Lie de vin Formation is consistent with an earlier reported 521 ± 7 Ma age from the Lie de vin but suggests that a 526 ± 4 Ma age on Australian trilobite-bearing Lower Cambrian rocks may be too old. A 33+ Ma duration of the Avalonian Early Cambrian and an 8+ Ma length of the Avalonian trilobite-bearing Lower Cambrian support proposals that most Cambrian time was Early Cambrian and the majority of the Early Cambrian was pretrilobitic.

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Introduction to Special Issue ofCanadian Journal of Earth Sciences: Canadian contributions to planetary geoscience

Canadian Journal of Earth Sciences ◽

10.1139/cjes-2012-0164 ◽

2013 ◽

Vol 50 (1) ◽

pp. 1-3

Author(s):

Marie-Claude Williamson ◽

Catherine L. Johnson ◽

Paul J. Sylvester

Keyword(s):

Earth Sciences ◽

Annual Meeting ◽

Canadian Journal ◽

Special Session ◽

Special Issue ◽

Planetary Geology ◽

The Past ◽

Joint Annual Meeting ◽

New Vision ◽

At Home

The first Special Issue published by the Canadian Journal of Earth Sciences in the field of planetary sciences consists of a collection of nine papers on astromaterials, planetary geology, and Earth-based analogues. We describe the milestones that led to the development of the planetary geology and geophysics (PG&G) community in Canada over the past 5 years, which culminated in record-breaking attendance at a special session of the 2011 GAC–MAC–SEG–SGA Joint Annual Meeting held in Ottawa. The idea of a Special Issue was met with enthusiasm by delegates from coast to coast. By connecting the fields of earth and planetary sciences, the Canadian Journal of Earth Sciences pioneers a new vision for geoscience that expands the options available to Canadians who wish to publish their research at home.

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