Canadian Journal of Earth Sciences

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Late Neoproterozoic cap carbonates: Mackenzie Mountains, northwestern Canada: precipitation and global glacial meltdown
Canadian Journal of Earth Sciences - Tập 38 Số 8 - Trang 1229-1262 - 2001
Noël P. James, Guy M. Narbonne, T. Kurtis Kyser
The 3-27 m-thick cap carbonate overlying "Marinoan" Ice Brook Formation glacigene sediments and Keele Formation carbonate and terrigenous clastic rocks consists of two distinctive stratigraphic units. A lower, splintery, buff-weathering, microcrystalline dolostone of extensive lateral uniformity comprises mm-laminated peloidal sediment with local, low-angle, hummocky-like cross-stratifica...... hiện toàn bộ
A study of the isotopic abundance of boron from various sources
Canadian Journal of Earth Sciences - Tập 5 Số 4 - Trang 921-927 - 1968
EK Agyei, C. C. McMullen
The absolute ratio of 11B/10B has been determined for boron from different terrestrial sources with a precision of 0.2% (two standard errors) and a reproducibility of 0.2% (half-range). Values fall in the range 4.108 to 3.987 (i.e. 3% variation) and give a corresponding range in the boron atomic weight of 10.814 to 10.810 (0.04% variation). The ab...... hiện toàn bộ
Palynology of Indian and European forest clearance and farming in lake sediment cores from Awenda Provincial Park, Ontario
Canadian Journal of Earth Sciences - Tập 23 Số 1 - Trang 43-54 - 1986
Elliott T. Burden, John H. McAndrews, Geoffrey Norris
Palynologic analyses of four short cores collected along shallow- to deep-water transects in Second and Gignac lakes indicate two periods of forest clearance for farming. The first deforestation was by Huron Indians between A.D. 1450 and 1650, when a maple (Acer), beech (Fagus), and oak (Quercus) forest was cleared and corn (Zea) planted. This disturbance is identified by decreased tree p...... hiện toàn bộ
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
Compositional and thermal state of the upper mantle beneath the Bering Sea basalt province: evidence from the Chukchi Peninsula of Russia
Canadian Journal of Earth Sciences - Tập 34 Số 6 - Trang 789-800 - 1997
В. В. Акинин, Julia Apt, Michael F. Roden, D. Francis, E. J. Moll-Stalcup
Nephelinites and basanites of the Enmelen volcanic field, Chukchi Peninsula, Russia, contain upper mantle xenoliths of relatively calcium- and magnesium-rich spinel lherzolites, pyroxenites, and megacrysts. The phase assemblages of the lherzolites require equilibration near 1.5 GPa, and calculated equilibration temperatures for most inclusions are in the range 850–1030 °C. These temperatu...... hiện toàn bộ
Holocene history of Bedford Basin, Nova Scotia: foraminifera, dinoflagellate, and pollen records
Canadian Journal of Earth Sciences - Tập 19 Số 12 - Trang 2342-2367 - 1982
Ann A. L. Miller, Peta J. Mudie, David B. Scott
Three piston cores from Bedford Basin, a silled coastal inlet, provide the basis for a micropaleontological study of postglacial to recent sediments. Five faunal units (four foraminiferal, one arcellacean) are found in core 79-11: a surface assemblage, followed by deep estuarine, marginal marine, transition, and freshwater (arcellacean) assemblages. The other cores contain only expanded m...... hiện toàn bộ
Growth and demise of an Archean carbonate platform, Steep Rock Lake, Ontario, Canada
Canadian Journal of Earth Sciences - Tập 36 Số 4 - Trang 565-584 - 1999
Timothy M. Kusky, Peter J. Hudleston
The Steep Rock Group of northwest Ontario's Wabigoon subprovince is one of the world's thickest Archean carbonate platform successions. It was deposited unconformably over a 3001-2928 Ma gneissic terrane, and contains a remarkable group of biogenic and oolitic limestones, dolostones, micrites, and karst breccias capped by a thick paleosol developed between and over karst towers. The prese...... hiện toàn bộ
Landscape evolution in Africa during the Cenozoic and Quaternary—the legacy and limitations of Lester C. King
Canadian Journal of Earth Sciences - Tập 53 Số 11 - Trang 1089-1102 - 2016
Kevin Burke, M. Justin Wilkinson
African landscape evolution since 66 Ma reflects interactions among parts of the Earth system from the Core to the Biosphere. We stress changes in those interactions in three events that have dominated landscape development: (i) a climatic revolution when the circumpolar current and the East Antarctic ice sheet first formed ∼37 Ma; (ii) a tectonic revolution at ∼32 Ma dominated by elevatio...... 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
Metamorphism of the Settler Schist, southwest of Yale, British Columbia
Canadian Journal of Earth Sciences - Tập 13 Số 3 - Trang 405-421 - 1976
Lee C. Pigage
Pelitic metasediments immediately southwest of Yale, British Columbia contain mineral assemblages characteristic of staurolite through sillimanite zones of the Barrovian facies series. Microprobe analyses of major constituent phases in the pelites are combined with linear regression techniques to formulate probable kyanite- and sillimanite-forming reactions.A zone some 3 km wide contains ...... hiện toàn bộ
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