Canadian Journal of Earth Sciences
SCIE-ISI SCOPUS (1968-1969,1976-2023)
1480-3313
0008-4077
Canada
Cơ quản chủ quản: Canadian Science Publishing , National Research Council of Canada
Lĩnh vực:
Earth and Planetary Sciences (miscellaneous)
Các bài báo tiêu biểu
A Guide to the Chemical Classification of the Common Volcanic Rocks A system is presented whereby volcanic rocks may be classified chemically as follows:I. Subalkaline Rocks:A. Tholeiitic basalt series:Tholeiitic picrite-basalt; tholeiite; tholeiitic andesite.B. Calc-alkali series:High-alumina basalt; andesite; dacite; rhyolite.II. Alkaline Rocks:A. Alkali olivine basalt series:(1) Alkalic picrite–basalt; ankaramite; alkali basalt; hawaiite; mugearite; be... ... hiện toàn bộ
Tập 8 Số 5 - Trang 523-548 - 1971
Towards a paleogeography and tectonic evolution of Iran Maps of the paleography of Iran are presented to summarize and review the geological evolution of the Iranian region since late Precambrian time. On the basis of the data presented in this way reconstructions of the region have been prepared that take account of the known major movements of continental masses. These reconstructions, which appear at the beginning of the paper, show some st... ... hiện toàn bộ
Tập 18 Số 2 - Trang 210-265 - 1981
Strain variation in shear belts In rocks deformed by natural orogenic processes it is usual to find that the finite strain state varies from locality to locality. In some deformed rocks high strain states are localized within approximately planar zones commonly known as "shear belts".The general relationships that exist between variable displacement and variable strain state are established, and these general equations ... ... hiện toàn bộ
Tập 7 Số 3 - Trang 786-813 - 1970
Balanced cross sections Post-depositional concentric deformation produces no significant change in rock volume. Since bed thickness remains constant in concentric deformation, the surface area of a bed and its length in a cross-sectional plane must also remain constant. Under these conditions, a simple test of the geometric validity of a cross section is to measure bed lengths at several horizons between referen... ... hiện toàn bộ
Tập 6 Số 4 - Trang 743-757 - 1969
Ubiquity of anomalous fading in K-feldspars and the measurement and correction for it in optical dating Anomalous-fading rates were measured in K-feldspars separated from 49 sediment samples, mainly from North America. The intensity of the optically stimulated luminescence was found to decrease linearly with the logarithm of time since irradiation between 2 days and ~1 year of storage at room temperature. Anomalous-fading rates ranged from 2% to 10% per decade, a decade being a factor of 10... ... hiện toàn bộ
Tập 38 Số 7 - Trang 1093-1106 - 2001
U–Pb dating of monazite and its application to geological problems Monazite is an underutilized mineral in U–Pb geochronological studies of crustal rocks. It occurs as an accessory mineral in a wide variety of rocks, including granite, pegmatite, felsic volcanic ash, felsic gneiss, pelitic schist and gneiss of medium to high metamorphic grade, and low-grade metasedimentary rocks, and as a detrital mineral in clastic and metaclastic sediments.In geochrono... ... hiện toàn bộ
Tập 27 Số 11 - Trang 1431-1450 - 1990
Appalachian Orogen in Canada The Appalachian Orogen is divided into five broad zones based on stratigraphic and structural contrasts between Cambrian–Ordovician and older rocks. From west to east, these are the Humber, Dunnage, Gander, Avalon, and Meguma Zones.The westerly three zones fit present models for the development of the orogen through the generation and destruction of a late Precambrian – Early Paleozoic Ia... ... hiện toàn bộ
Tập 16 Số 3 - Trang 792-807 - 1979
What are glacier surges? A total of 204 surging glaciers has been identified in western North America. These glaciers surge repeatedly and probably with uniform periods (from about 15 to greater than 100 years). Ice flow rates during the active phase may range from about 150 m/year to > 6 km/year, and horizontal displacements may range from < 1 to > 11 km. Ice reservoir and ice receiving areas can be def... ... hiện toàn bộ
Tập 6 Số 4 - Trang 807-817 - 1969
Large igneous provinces (LIPs), giant dyke swarms, and mantle plumes: significance for breakup events within Canada and adjacent regions from 2.5 Ga to the PresentThis article is one of a selection of papers published in this Special Issue on the the theme Lithoprobe—parameters, processes, and the evolution of a continent.Lithoprobe Contribution 1482. Geological Survey of Canada Contribution 20100072. Large igneous provinces (LIPs) are high volume, short duration pulses of intraplate magmatism consisting mainly of flood basalts and their associated plumbing system, but also may include silicic components and carbonatites. Many LIPs have an associated radiating diabase dyke swarm, which typically converges on a cratonic margin, identifies a mantle plume centre, and is linked to breakup ... ... hiện toàn bộ
Tập 47 Số 5 - Trang 695-739 - 2010
Oxidation–reduction sequences in ground water flow systems Hydrogeologists and ground water geochemists have observed a decline in the measured (platinum electrode) potential, EH , of ground water as it migrates from upland recharge areas to lowland discharge areas under confined conditions. Such variations in EH and variations in concentrations of elements with variable oxidation states (e.g., oxygen, nit... ... hiện toàn bộ
Tập 16 Số 1 - Trang 12-23 - 1979