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
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-stratification, mic...
A study of the isotopic abundance of boron from various sources
Canadian Journal of Earth Sciences - Tập 5 Số 4 - Trang 921-927 - 1968
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 absolute ratios are 7% lower than those
reported by e...
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
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 pollen
and...
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
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
intrusions (...
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
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
temperatures are s...
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
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
marine seq...
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
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
presence of ar...
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
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
elevation of ∼30...
The chemical evolution of the Canadian Shield
Canadian Journal of Earth Sciences - Tập 5 Số 5 - Trang 1247-1252 - 1968
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 anatectic melting. The erosion of a zoned crust would result in
the enric...
Metamorphism of the Settler Schist, southwest of Yale, British Columbia
Canadian Journal of Earth Sciences - Tập 13 Số 3 - Trang 405-421 - 1976
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 the
assem...
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