Regional geochemical study of the Slave Point carbonates, Western Canada

1969 ◽  
Vol 6 (2) ◽  
pp. 247-268 ◽  
Author(s):  
E. M. Cameron
Keyword(s):  
Discriminant Function ◽  
Element Distribution ◽  
Western Canada ◽  
Prominent Feature ◽  
Reef Facies ◽  
Geochemical Study ◽  
Facies Change ◽  
Devonian Age ◽  
Multivariate Discriminant ◽  
Significant Chemical

A regional geochemical study of the Slave Point Formation within an area of 35 000 square miles (~90 000 km2) in the subsurface of western Canada was made to relate chemical variation to facies change. Core and cuttings samples were obtained from 90 wells drilled for petroleum. The Slave Point Formation is a relatively uniform and pure calcitic limestone of Middle Devonian age. A reef facies, dolomitized in places, is developed along the margin of the carbonate shelf with a shale basin. These dolomites produce natural gas from several fields.R-mode factor analysis methods have been used to help interpret the element distribution. There are slight, but significant, chemical differences between limestones occurring close to dolomites and gas discoveries and limestones distant from these features. The principal differences are a smaller content of magnesium and strontium held in solid solution in the calcites and less clay minerals and pyrite in limestones occurring close to gas discoveries. These differences, which are related to dissimilar conditions during deposition and diagenesis, are used to form a multivariate discriminant function separating the two groups of limestone. This discriminant function is used to classify the different limestone sections. Sphalerite (with galena and quartz), a prominent feature of the unit, occurs principally in the dolomites along the margin of the shale basin.

Biostratigraphy of Devonian stromatoporoid faunas of arctic and western Canada

2001 ◽  
Vol 75 (1) ◽  
pp. 9-23 ◽  
Author(s):  
Colin W. Stearn
Keyword(s):  
Soviet Union ◽  
Former Soviet Union ◽  
Western Canada ◽  
Species Definition ◽  
Reef Facies ◽  
Supplementary Method ◽  
Method Of Correlation

Through a review of older type collections and identifications of undescribed collections, using a broad species definition, the Devonian succession is divided into 10 assemblages. The names of many species are revised. With the exception of the Pragian, all stages of the system are represented by one or more assemblages. The ranges of important taxa are plotted and shown to be relatively short and diagnostic of the 10 intervals. In the absence of conodonts in the reef facies, stromatoporoids offer a supplementary method of correlation. Many species occurring in Canada can be recognized in the stromatoporoid faunas of the former Soviet Union, China, Europe, and Australia.

Search-phase echolocation calls of the New Zealand lesser short-tailed bat (Mystacina tuberculata) and long-tailed bat (Chalinolobus tuberculatus)

1997 ◽  
Vol 75 (9) ◽  
pp. 1487-1494 ◽  
Author(s):  
Stuart Parsons
Keyword(s):  
New Zealand ◽  
Discriminant Function ◽  
Discriminant Function Analysis ◽  
Function Analysis ◽  
High Rate ◽  
Echolocation Calls ◽  
Spectral Components ◽  
Lower South ◽  
Rate Of Success ◽  
Multivariate Discriminant

This paper describes the search-phase echolocation calls of lesser short-tailed bats (Mystacina tuberculata) and long-tailed bats (Chalinolobus tuberculatus). Calls were recorded from all three subspecies of short-tailed bat and seven populations of long-tailed bat, three in Northland, two in the central North Island, and two in the lower South Island. The calls were recorded in the field and digitised, then three spectral components and one temporal component of the calls were measured. Calls of the lesser short-tailed bat could be loosely classified into subspecies by means of multivariate discriminant function analysis. Similarly, long-tailed bat calls showed regional variation, and discriminant function analysis was able to fit calls to regional groups with a high rate of success. The significance of the results presented is discussed in terms of the conservation of New Zealand bats and the unique ecology of the lesser short-tailed bat.

scholarly journals Federal-Provincial Relations and Conservatism in the Canadian West

Federalism-E ◽  
2016 ◽  
Vol 17 (1) ◽  
pp. 61-75
Author(s):  
Connor Molineaux
Keyword(s):  
Political Culture ◽  
Federal Government ◽  
Natural Resource ◽  
Recent Decade ◽  
Western Canada ◽  
Prominent Feature ◽  
Conservative Ideology ◽  
Conservative Policy ◽  
Intergovernmental Conflict ◽  
Canadian Political Culture

Regionalism has been a prominent feature of Western Canadian political culture even prior to Alberta and Saskatchewan joining confederation in 1905. One manifestation of this regionalism is through intergovernmental conflict, particularly jurisdictional disputes between the provincial and federal governments. These disputes have generally seen provincial governments of various ideological leanings cooperate, and yet decentralization–or expansion of provincial jurisdiction–is a position that has largely been advanced by conservatives in recent decade.1Is there an ideological connection between expansion of provincial jurisdiction and conservatism? This essay contends that the conservative ideology particular to Western Canada was uniquely influenced by the dynamic of federal-provincial relations in Canada because of particular features of the region’s brand of conservatism. This essay will demonstrate that ongoing disputes between western provinces–Alberta in particular–and the federal government, particularly over natural resource issues, have reinforced a dynamic of regionalism within Western Canadian conservatism, leading it to become the perennial feature of conservative policy, federally and provincially, that it is today.[...]

Distribution and systematic relationships of long-eared Myotis in western Canada

1979 ◽  
Vol 57 (5) ◽  
pp. 987-994 ◽  
Author(s):  
C. G. van Zyll de Jong
Keyword(s):  
Discriminant Function ◽  
Discriminant Function Analysis ◽  
Function Analysis ◽  
Distinct Species ◽  
Similarity Coefficient ◽  
Western Canada ◽  
Myotis Septentrionalis ◽  
General Similarity ◽  
Systematic Relationships

Cranial, dental, and external characters of three long-eared bats (Myotis evotis (H. Allen), M. keenii keenii (Merriam), and M. k. septentrionalis (Trouessart)) are analyzed to elucidate their relationship, and an up-to-date summary of their distribution in western Canada is given. Although univariate comparisons showed varying degrees of overlap between any two of the three forms, discriminant function analysis demonstrates the existence of three phenetically distinct forms in western Canada. Further analyses using a ratio diagram and Gower's general similarity coefficient suggest that the eastern long-eared bat represents a distinct species, Myotis septentrionalis (Trouessart).

scholarly journals Late Ordovician Mafic Magmatic Event, Southeast Siberia: Tectonic Implications, LIP Interpretation, and Potential Link with a Mass Extinction

Minerals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1108
Author(s):  
Andrey K. Khudoley ◽  
Andrei V. Prokopiev ◽  
Kevin R. Chamberlain ◽  
Aleksandr D. Savelev ◽  
Richard E. Ernst ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Mass Extinction ◽  
Major And Trace Elements ◽  
Element Distribution ◽  
Trace Element Distribution ◽  
Chemical Compositions ◽  
Geochemical Study ◽  
Tectonic Reconstruction ◽  
Potential Link ◽  
Magmatic Intrusions

A geochronological, isotopic, and geochemical study of the Suordakh event of mafic magmatic intrusions on the southeast Siberian margin was undertaken. U-Pb baddeleyite dating of a mafic sill intruding lower Cambrian rocks, yielded a 458 ± 13 Ma emplacement age. The chemical composition and stratigraphic setting of this dated sill differed from that previously attributed to the Suordakh event, implying that additional intrusions, previously mapped as Devonian, potentially belonged to the Suordakh event. No correlation between L.O.I. and concentration of highly mobile major and trace elements was documented, showing small or no influence of hydrothermal alteration on the chemical composition of the intrusions. A new tectonic reconstruction located an island arc and active margin relatively close to the study area. However, all samples had chemical compositions close to that of OIB and did not display Ta-Nb and Ti-negative anomalies, nor other features typical for subduction-related magmatism. The major and trace element distribution was most characteristic of within-plate basalts with the mantle source composition being transitional from spinel to garnet lherzolite. Combining four U-Pb baddeleyite dates of mafic sills and dykes from southeast Siberia, the age of the Suordakh event was estimated at 454 ± 10 Ma. The area of the Suordakh event was at least 35,000–40,000 km2 (an estimate including sills previously interpreted as Devonian), and could be increased with additional dating in Southeastern Siberia. Similar ages for within-plate intrusions were reported from South Korea, West Mongolia, South Argentina, North Iran and Northwest Canada, and these ca. 450 Ma ages were collectively close in timing with the latest Ordovician (Hirnantian) mass extinction. More high-precision dating is necessary to fully test a link between the Suordakh event (and the other age-correlative events) and the end-Ordovician mass extinction.

Geochemical and isotopic evidence for a genetic link between Canadian Shield brines, dolomitization in the Western Canada Sedimentary Basin, and Devonian calcium-chloridic seawater

2005 ◽  
Vol 42 (11) ◽  
pp. 2059-2071 ◽  
Author(s):  
Dennis J Bottomley ◽  
Ian D Clark ◽  
Nicholas Battye ◽  
Tom Kotzer
Keyword(s):  
Sedimentary Basin ◽  
Canadian Shield ◽  
Western Canada ◽  
Genetic Associations ◽  
Lower Paleozoic ◽  
Western Canada Sedimentary Basin ◽  
Basement Rocks ◽  
Evaporative Concentration ◽  
Devonian Age ◽  
Canada Sedimentary Basin

Hypersaline brines of marine origin, deep within fractured crystalline rocks of the Canadian Shield, are characterized by calcium-chloride compositions with relatively low concentrations of magnesium and sulphate. Such chemistries among crustal fluids are very unusual, regardless of their origins, which makes it difficult to identify possible genetic associations between shield brines and other marine brines. Key conservative chemical and isotopic attributes of shield brines from the Yellowknife and Sudbury areas are similar, however, to those of fluid inclusions in sparry, late-stage hydrothermal dolomites in lower Paleozoic carbonates of the Western Canada Sedimentary Basin, suggesting that both fluid types originated from a residual seawater brine of probable Devonian age. This interpretation is supported by determination of a helium-4 model age for the Yellowknife brine that is consistent with a Devonian origin. Therefore, dolomitization was likely both a major source of Ca and a sink for about half of the initial Mg in the brine prior to its infiltration into the underlying basement rocks. Mass-balance considerations indicate that albitization of plagioclase, predominantly in basinal clastic sediments, was an equally important mineral source of Ca to the infiltrating brine, but interactions with carbonate and silicate rocks cannot account for the entire Ca inventory in the brine. A major contribution to the Ca budget must also have been initially provided by the evaporative concentration of seawater, which is only possible if it were enriched in calcium and depleted in sulphate compared with modern seawater, as was probably the case during Devonian time.

A numerical approach toward the classification of magnetites from tephra in southern Alberta

1982 ◽  
Vol 19 (10) ◽  
pp. 2012-2019 ◽  
Author(s):  
R. H. King ◽  
M. S. Kingston ◽  
R. L. Barnett
Keyword(s):  
Function Analysis ◽  
Numerical Approach ◽  
Western Canada ◽  
Banff National Park ◽  
Stratigraphic Framework ◽  
Southern Alberta ◽  
Compositional Variations ◽  
Significant Chemical ◽  
Reference Samples

High-titanium glass-encased magnetites associated with intermixed tephras in upper subalpine soils in Banff National Park are shown to be characteristic of Mazama tephra and of regional significance. Similar magnetites occur in a Mazama layer above a paleosol at Fish Creek, Alberta and within a sample of Mazama ash (UA 396) from Windy Point, Alberta. Detailed sampling and analysis of the Fish Creek tephra indicate that the magnetites do not represent a separate eruptive event or an older ashfall. Cluster analysis of glass-encased magnetites from reference samples of Mazama, St. Helens Y, and Bridge River ashes revealed composite grouping of Mazama and Bridge River magnetites and separate and strong groupings of high-TiO2 magnetites. Discriminant analysis identifies MgO, TiO2, and Al2O3 as the most significant chemical discriminants between the various ashes. Discriminant function analysis identifies the high-titanium magnetites as Mazama in type and successfully classifies 96% of the tephra-derived magnetites in two soils developed from intermixed ashes. Numerical analysis confirms the utility of compositional variations in tephra-derived magnetites in providing a time-stratigraphic framework in the analysis of volcanic ash soils in western Canada.

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