Canadian Journal of Earth Sciences

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Contrasting Si-saturation in troctolite-anorthosite intrusions along the Manicouagan corridor of the Abitibi-Grenville transect
Canadian Journal of Earth Sciences - Tập 37 Số 2-3 - Trang 271-289 - 2000
D. Francis, P. A. H. Scowen, Gerald Panneton, Ronald Doig
A survey of troctolite-anorthosite complexes along the Manicouagan corridor of the Abitibi-Grenville Lithoprobe transect reveals the existence of two distinct crystallization sequences in their cumulate rocks. In two intrusions (Brien and Raudot), olivine crystallized first, followed by plagioclase, Fe-oxides, and then clinopyroxene; and magmatic orthopyroxene is absent. In five other int...... hiện toàn bộ
The chemical evolution of the Canadian Shield
Canadian Journal of Earth Sciences - Tập 5 Số 5 - Trang 1247-1252 - 1968
W F Fahrig, K E Eade
Archean surface crystalline rocks of the Canadian Shield differ chemically from those of Proterozoic age. The younger rocks are higher in K2O, TiO2, U, and Th and lower in Na2O, Cr, Ni, and possibly MgO and CaO. This may be a secondary result of vertical chemical zoning of the crust as a result of metamorphism accompanied by a...... hiện toàn bộ
Baffin Bay/Nares Strait surface (seafloor) sediment mineralogy: further investigations and methods to elucidate spatial variations in provenance
Canadian Journal of Earth Sciences - Tập 56 Số 8 - Trang 814-828 - 2019
John T. Andrews
The goal of the paper is to ascertain whether there are significant regional variations in sediment mineral composition that might be used to elucidate ice sheet histories. The weight percentages of nonclay and clay minerals were determined by quantitative X-ray diffraction. Cluster analysis, an unsupervised learning approach, is used to group sediment mineralogy of 263 seafloor/core top ...... hiện toàn bộ
Tectonic evolution of the Yaoundé segment of the Neoproterozoic Central African Orogenic Belt in southern Cameroon
Canadian Journal of Earth Sciences - Tập 44 Số 4 - Trang 433-444 - 2007
Hubert Mvondo, Sébastien Owona, Joseph Mvondo Ondoa, Jean Essono
The deformation history of the Neoproterozoic Central African Orogenic Belt in southern Cameroon is well recorded in the low- to high-grade rocks outcropping in the area around Yaoundé. The fabrics in these rocks are consistent with two main ductile deformation events D1 and D2. D1 predated emplacement of calc-alkaline dioriti...... hiện toàn bộ
Cosmogenic exposure dating in arctic glacial landscapes: implications for the glacial history of northeastern Baffin Island, Arctic Canada
Canadian Journal of Earth Sciences - Tập 42 Số 1 - Trang 67-84 - 2005
Jason P. Briner, Gifford H. Miller, P. Thompson Davis, Robert C. Finkel
Cosmogenic exposure dating and detailed glacial-terrain mapping from the Clyde Foreland, Baffin Island, Arctic Canada, reveal new information about the extent and dynamics of the northeastern sector of the Laurentide Ice Sheet (LIS) during the last glacial maximum (LGM). The Clyde Foreland is composed of two distinct landscape zones: (1) glacially scoured terrain proximal to the major sou...... hiện toàn bộ
Origin, Morphology, and Chronology of Sublacustrine Moraines, Generator Lake Baffin Island, Northwest Territories, Canada
Canadian Journal of Earth Sciences - Tập 11 Số 3 - Trang 380-408 - 1974
D M Barnett, G. Holdsworth
The morphology and chronology of exposed sublacustrine moraines is discussed. These are shown to have been formed in a sublacustrine environment. The moraines are characterized by their occurrence in large numbers within a former ice dammed lake basin and by their asymmetric cross section. Using moraine volume estimates combined with the time control, a till depositional rate is calculate...... hiện toàn bộ
Skeletal remains of a small theropod dinosaur with associated soft structures from the Lower Cretaceous Santana Formation of northeastern Brazil
Canadian Journal of Earth Sciences - Tập 37 Số 6 - Trang 891-900 - 2000
David M. Martill, Eberhard Frey, Hans‐Dieter Sues, A. R. I. Cruickshank
Associated well-preserved, uncrushed skeletal remains, comprising the pelvic girdle, partial sacrum, both femora, and parts of the right tibia and fibula, from the Romualdo Member of the Lower Cretaceous Santana Formation of northeastern Brazil record the presence of a previously unknown coelurosaurian theropod dinosaur in that formation. The pelvic girdle is noteworthy for the bilaterall...... hiện toàn bộ
Early Paleozoic chronology: a review in light of new U – Pb zircon ages from Newfoundland and Britain
Canadian Journal of Earth Sciences - Tập 32 Số 4 - Trang 368-379 - 1995
Robert D. Tucker, W. S. McKerrow
The time scale for the Cambrian through Early Devonian periods is revised using new U–Pb ages from volcanic and pyroclastic rocks in sequences that are stratigraphically well defined. A rhyolite flow from the latest Precambrian, dated at 551.4 ± 5.8 Ma, gives a maximum age for the base of the Cambrian (Phycodes pedum Zone) at Fortune Bay, Newfoundland. The age ranges of several Ordovician...... hiện toàn bộ
Early diagenetic processes in deep Labrador Sea sediments: reactive and nonreactive iron and phosphorus
Canadian Journal of Earth Sciences - Tập 31 Số 1 - Trang 14-27 - 1994
Marc Lucotte, Alfonso Mucci, Claude Hillaire‐Marcel, S. Tran
A sequential extraction procedure was applied to separate the oxides and lithogenous phases of iron and manganese and the organic and inorganic phosphorus phases in four box cores and one piston core from the slopes and rises of the Labrador Sea. Sedimentation rate, rather than the location in the basin, appears as a master variable of the diagenetic transformations of Fe, Mn, and P. High...... hiện toàn bộ
Iron phosphate precipitation by epilithic microbial biofilms in Arctic Canada
Canadian Journal of Earth Sciences - Tập 31 Số 8 - Trang 1320-1324 - 1994
Kurt O. Konhauser, W. S. Fyfe, Susanne Schultze-Lam, F. G. Ferris, Terry J. Beveridge
On Ellesmere Island, in the Canadian Arctic, dark-colored biofilms proliferate on moist surfaces, including exposed granodiorite outcrops. Transmission electron microscopy of these biofilms indicates that complex epilithic microbial communities developed, consisting of cyanobacteria and fungi symbiotically associated in a lichen, along with a consortium of free-living algae and gram-negat...... hiện toàn bộ
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